498+ tools. Pick one. Get it done.

JSON Formatter

Format, validate & minify JSON in your browser

QR Code Generator

Create QR codes for URLs, text, WiFi or anything

Password Generator

Strong, random passwords — generated in your browser

Percentage Calculator

Calculate percentages, increases, decreases & more

Word Counter

Count words, characters, sentences & reading time instantly

AI Team Cost Calculator

Estimate monthly AI API costs for teams of any size

EU AI Act Risk Classifier

Classify your AI system — Prohibited, High, Limited, Minimal risk

AI Budget Burn Predictor

Predict when your API budget runs out — month by month

AI vs Human Cost Calculator

Is AI or a human cheaper for this task?

Prompt Cache ROI Calculator

Anthropic caching — calculate real cost savings

LLM Consistency Tester

Paste N outputs — measure variance, similarity, stability

RAG vs Long-Context Calculator

When is RAG cheaper than stuffing context?

Batch API Discount Calculator

Is 50% off worth 24h delay?

Embedding Cost Calculator

Vector DB + embedding cost across providers

Fine-tune vs Prompting ROI

When does fine-tuning pay off?

Model Benchmark Picker

Which LLM wins for your task?

Prompt Injection Scanner

Scan user input for jailbreak patterns

Hallucination Severity Scorer

Not just yes/no — how bad is this hallucination?

AI Model Card Generator

Standardized disclosure doc for your AI system

GDPR for LLMs Compliance Checker

Is your LLM setup GDPR-compliant?

Semantic Similarity Calculator

Cosine, Jaccard, Levenshtein between any 2 texts

Token Budget Allocator

Split max_tokens across system / user / output

Context Window Optimizer

Trim long documents to fit context window

Embedding Dimension Chooser

256 vs 1024 vs 3072 — quality vs cost

AI Environmental Cost Calculator

CO₂, water, energy per 1M tokens

Model Deprecation Migration Planner

Plan your LLM migration before sunset

AI Image Provider Cost Comparator

Midjourney vs DALL-E vs Flux vs Ideogram pricing

AI Image Workflow Budget

Total budget for your image generation workflow

Image Size + Platform Optimizer

Optimal dimensions for each platform (social, ad, print)

AI Image License Checker

Commercial use rights across AI providers

Image File Size Estimator

Predict file size before export

Color Palette Extractor

Top 8 colors from any image — browser only

AI Image Metadata Scanner

C2PA, EXIF, AI watermarks — detect source

AI Video Cost Calculator

Sora vs Runway vs Kling vs Veo vs Pika per second

AI Voice-over Cost Calculator

ElevenLabs vs PlayHT vs OpenAI TTS pricing

Video Storyboard Budget Planner

Full project cost: scenes × length × provider

Video File Size Calculator

MP4, MOV, WebM size from bitrate + duration

AI Video Provider Quality Matrix

Motion, realism, adherence — compare 8 providers

Video Format Optimizer

Specs for TikTok, Reels, Shorts, YouTube, LinkedIn

Video Frame Rate Cost Analyzer

24 vs 30 vs 60fps — real cost delta

AI Design Tool Cost Comparator

Figma AI vs v0 vs Framer AI vs Adobe Firefly

Color Contrast Checker + Fixer

WCAG 2.2 AA/AAA + auto-suggest accessible palette

Typography Scale Calculator

Modular scale — rem + px + line-height

Design Token Auditor

Paste CSS → find inconsistencies

AI Logo Prompt Generator

Guided wizard → optimal Midjourney/Flux prompt

Accessibility Quick-Scan

Paste HTML → WCAG 2.2 score + fixes

AI Agent Framework Cost Comparator

LangChain vs CrewAI vs AutoGen vs LangGraph

Agent Step Cost Multiplier

1 user query × N agent steps = real cost

Tool-Use / Function-Call Cost

Schema overhead × call frequency = bill

Multi-Agent Negotiation Cost

When agents talk to agents — token explosion

AI Agent Latency Budget

How slow is your N-step agent?

Multi-Model Router Cost Optimizer

Route easy/medium/hard queries to cheapest model

Context Window Burn Rate

How fast does your 200K / 1M window fill up?

RAG Pipeline Total Cost

Embed + Vector DB + LLM + Re-rank — all in one

LLM Output Determinism Tester

Paste 2+ outputs — see how variant your prompt is

Streaming vs Batch API Cutoff

When does Anthropic Batch API beat real-time?

Rate-Limit Burst Hit Predictor

Will your traffic spike hit the RPM ceiling?

AI Provider Indemnity Comparator

Anthropic vs OpenAI vs Google — who covers what?

End-to-End LLM Latency Budget

Frontend → API → Vector → LLM → Render

AI Business Name Scorer

Score business names for SEO, domain availability & brandability

AI Contract Red-Flag Scanner

Scan contracts for risky clauses — 50+ patterns checked

AI Review Analyzer

Analyze reviews for sentiment, keywords & actionable insights

Content Launch Pad

Turn one text into meta tags, social posts, newsletter & schema

YouTube to Blog Converter

Turn YouTube videos into formatted blog posts

AI Roast My Website

Get brutally honest (and funny) website feedback

AI Headline A/B Tester

Compare two headlines — get EMV score, power words & CTR prediction

Will AI Replace My Job? Vulnerability Score

Paste job description — see AI-takeover risk + timeline

AI vs Human Writing — Reverse Turing Test

Paste text — heuristic detection of AI authorship

AI Citation Hallucination Checker

Spot fake citations from ChatGPT/Claude in seconds

AI-Generated Image Heuristic Detector

Visual + metadata flags — Midjourney, DALL-E, SDXL

AI Voice-Clone Scam Detector

Recognize "grandparent scam" with AI voice clones

EU AI Act Article 50 Disclosure Check

Must you label AI-generated content? Aug 2026 deadline

AI Subscription Stack Audit

Audit your $20+$20+$25+$20 AI bill — what to keep

AI Agent vs Human Worker Equivalent

How many Claude/GPT agents = 1 human in your role?

AI Dependency Crash Test

What breaks if ChatGPT is down 3 days?

Prompt Quality Score

Paste prompt — get rating + improvements

AI TOS Data-Training Risk Analyzer

Paste TOS — does it use your data for training?

AI Productivity Lift Tracker

Real % time saved by AI — track 1 task at a time

Meta Title + Description Scanner

SEO audit for your <head> tags

Schema.org JSON-LD Validator

Validate structured data before deploy

Internal Link Analyzer

Count + analyze links in HTML

Broken Link Pattern Finder

Detect likely-broken URLs in your content

Heading Hierarchy Scanner

H1-H6 structure audit

Image Alt-Text Coverage Scanner

Find images missing alt text

Canonical + Hreflang Checker

International SEO tag audit

Sitemap XML Validator

Validate sitemap.xml structure

Robots.txt Analyzer

Audit your robots.txt for issues

AEO (Answer Engine Optimization) Scorer

Score content for AI search visibility

GEO (Generative Engine Optimization)

Score content for LLM citations

Content Originality Scanner

Check for AI-sounding / generic content

Core Web Vitals JSON Analyzer

Parse Lighthouse output for CWV scores

Bundle Size Analyzer

Budget your JS bundle size

Cache Header Inspector

Audit Cache-Control + ETag strategy

Image Optimization Scanner

Find optimization opportunities in HTML

Font Loading Analyzer

Audit @font-face + font loading strategy

CDN Detector

Which CDN is this site using?

Render-Blocking Resource Analyzer

Find scripts + CSS blocking first paint

PWA Readiness Scanner

Audit manifest.json + service worker

ARIA Labels Audit

Find missing or misused ARIA

Form Label Coverage Scanner

Every input needs a label

Keyboard Navigation Checklist

Audit your page for keyboard-only users

Landmark Region Checker

Semantic HTML landmarks audit

HTTP Security Headers Checker

Audit HSTS, X-Frame, CSP, etc

CSP Policy Analyzer

Content Security Policy audit

SSL/TLS Cipher Strength Guide

Interpret cipher suites + TLS versions

Exposed Secrets Scanner

Detect API keys, tokens in code

Cookie Security Audit

HttpOnly, Secure, SameSite check

Mixed Content Detector

Find http:// resources on HTTPS pages

Cookie Banner Compliance Checker

GDPR/ePrivacy audit for your banner

Privacy Policy Freshness Check

Is your policy up to date?

GDPR Footer Audit

Required footer links check

Terms of Service Readability

Is your ToS readable by humans?

CTA Visibility Scanner

Find your call-to-action issues

Form Field Optimizer

Audit forms for conversion

Trust Signal Detector

Find trust-building elements

Landing Page Scorer

Overall conversion-readiness score

Open Graph Preview

See your OG tags as Facebook/LinkedIn will

Twitter Card Validator

Validate X/Twitter card meta tags

Website Speed Test

Test any website speed with Core Web Vitals & performance metrics

Keyword Research Tool

Find keyword ideas, questions & clusters — free Semrush alternative

Backlink Checker

Analyze backlinks for any domain — free Ahrefs alternative

Privacy Policy Analyzer

Analyze privacy policies for GDPR & CCPA compliance

Website Health Check

All-in-one website audit — speed, SEO, security & mobile

Amazon FBA Profit Calculator

Real margin after every fee — referral, FBA, storage, ads

Amazon Listing SEO Score

Title + bullets + description quality scored

Amazon BSR Decay Predictor

How fast does your Best Seller Rank slip?

Amazon Buy-Box Win Probability

Will you win the Buy Box? Multi-factor predictor

Amazon PPC ACoS Calculator

Bid, ACoS, ROAS, break-even bid in one screen

Amazon Listing vs Competitor

Paste 2 listings — see the gap

Amazon Variation Theme Optimizer

Parent/child structure that converts

Amazon Listing Image Compliance

Background, resolution, ratio — 12-rule check

Amazon Listing Hijacker Risk Score

How vulnerable is your listing to hijack?

Amazon Review Authenticity Score

Heuristic detector for fake review patterns

Etsy 13-Tag SEO Optimizer

Use all 13 tags strategically — long-tail wins

Etsy Listing Quality Score

All hidden quality factors — title, photos, tags, price

Etsy Listing Renewal ROI

Is the $0.20 auto-renew actually worth it?

Etsy Star Seller Probability

5★ rating + <24h reply + on-time + $1K sales

Etsy Niche Saturation Score

Is your niche already crowded? Total/competition ratio

Etsy Ads vs Organic Break-Even

When does Etsy Ads break even — or actually print money?

Amazon FBA Fee Calculator

Calculate FBA fees, profit margins & break-even price

Etsy Listing SEO Scorer

Score your Etsy listing for SEO — title, tags & description

Shopify Store Audit

Audit your Shopify store — speed, SEO, trust signals & mobile

Percentage Calculator

Calculate percentages, increases, decreases & more

Loan Calculator

Monthly payments, total interest & amortization

Currency Converter

Live exchange rates for 170+ currencies

Paycheck Calculator

Net salary after taxes — Germany, USA, UK

Crypto Tax Calculator

Calculate crypto capital gains — FIFO or LIFO

Mortgage Stress Test

Can you still afford your mortgage if rates rise?

Decision Matrix

Weighted pros/cons for hard decisions

Gross Margin Calculator

Revenue minus COGS over Revenue — business margin

CAGR Calculator

Compound Annual Growth Rate — investments and revenue

Mortgage Refinance Breakeven

When does refinance pay back?

FIRE Calculator (Lean / Fat / Coast / Barista)

Modern FIRE math — 4 variants compared

Currency Real Cost (Wise vs Revolut vs Bank)

Compare real fees, not just rates

Salary True Total Compensation

Equity + benefits + PTO as € value

Mortgage Stress Test 2026

What if rates rise to 8%?

Real Inflation-Adjusted Calculator

$10K in 1990 = ? today

Subscription Audit Stack

List all subs → find waste → save €

True Cost of Car Ownership

Way more than monthly payment

Cashback Multi-Card Optimizer

Best card per category — auto-routed

Buy vs Lease Calculator

Cars / equipment / property — break-even

Cost Per Use Calculator

€500 jacket worn 200× = €2.50/wear

Job Change ROI Calculator

Salary + commute + tax + cost-of-living — full picture

Pension Truth Calculator

Real purchasing power of your pension in 2050

Affordability Reality Check

Can I really afford this? Stress-test with surprises

Insurance Expected Value Calculator

Is the policy worth more than the premium?

Education ROI Calculator

Is the degree worth it? Opportunity cost included

Kids True Cost Calculator

Birth → 18: every realistic line item

Marriage Cost Reality

Wedding + first 5 years joint finance

Divorce Cost Reality

Legal fees + asset split + lifestyle change

True Hourly Wage Calculator

Real $/hr after commute, work clothes, lunch, taxes

Real Purchasing Power Converter

Beyond exchange rates — what $1 actually buys

Tip Fairness Calculator

Tip based on living-wage gap, not arbitrary %

Meeting True Cost Calculator

Multiply salaries × time — most meetings cost $1K+

Time-Money Converter

Stop counting dollars — count life hours

Client LTV by Acquisition Channel

Which channel brings the best lifetime value?

Agency Hourly Rate Calculator

Costs + utilization + margin = real billable rate

CAC Payback Period Calculator

Months to recover Customer Acquisition Cost

Retainer vs Project Profitability

Which pricing model wins for your work?

MQL → SQL Funnel Predictor

Forecast pipeline from top-of-funnel volume

Agency Utilization Rate Calculator

Billable hours ÷ available — agency profit lever #1

Invoice Generator

Create professional invoices and download as PDF

Salary Negotiation Calculator

Calculate your market value and negotiation range

Freelancer Price Calculator

Calculate your ideal hourly rate and project pricing

Subscription Cost Tracker

Track all subscriptions — see yearly cost & per-day breakdown

True Cost of Ownership

Calculate real cost of cars & homes including hidden expenses

Side Hustle Income Calculator

Calculate side hustle income after taxes and break-even time

Rent vs Buy Calculator

30-year simulation with inflation, interest & opportunity cost

Income Tax Estimator

Estimate income tax for US, UK, DE, CA & more countries

Resume vs Job Description Match Score

Paste both — see fit % + missing keywords

Salary Negotiation Range Calculator

Anchor + target + walk-away — with phrasing scripts

Interview Question Predictor

Top 20 likely questions per role + level

Cover Letter Tone Analyzer

Confidence, formality, fit signals — paste & score

LinkedIn Profile Quality Score

All 12 hidden ranking factors checked

Career Pivot Feasibility Calculator

Time + money cost to switch fields

Should I Quit My Job Today?

Composite score: burnout + savings + market + pivot cost

Should I Take This Job Offer?

Salary + commute + tax + AI-risk + culture in 1 score

Should I Buy This House?

Affordability + climate + resale + lifestyle composite

Should I Have a Kid Now?

Age + finances + career + relationship + health composite

Should I Move to This City?

Job + CoL + tax + climate + schools + politics composite

Should I Go Self-Employed?

Income volatility + savings + insurance + family composite

Crypto Tax-Loss Harvest Optimizer

Realize losses to offset gains — DE/US/UK rules

Stablecoin Yield + Safety Score

USDT, USDC, DAI — yield × risk

Self-Custody Migration Readiness

Are you ready to leave the exchange?

NFT Real ROI Calculator (with Gas)

Floor + gas + platform fees = actual profit

Crypto Portfolio Concentration Risk

How over-exposed are you to BTC/ETH/single coin?

DeFi Yield vs Staking vs CeFi

APY × risk-adjusted across all flavors

Phone Lifetime ROI: Keep or Upgrade?

Performance + battery + repair vs new

Phone Repair vs Buy New

Screen, battery, back glass — when to repair

Smartphone Trade-In Value Predictor

Depreciation curve per brand

Flight Delay Compensation (EU 261 / DOT)

Cancelled or delayed? Up to €600 EU / $600 US

VPN Worth-It Calculator

Privacy + streaming + security ROI score

2FA Method Risk-Score

SMS vs TOTP vs Hardware-Key — security ranked

Cap Rate Calculator Pro

NOI / value + market context

BRRRR Strategy Calculator

Buy-Rehab-Rent-Refi-Repeat — money out?

Rental Yield by City Comparator

Gross + net yield ranges across 30+ cities

Estate Planning Readiness Check

Will + POA + Trust + Beneficiaries — what you need

Inheritance Tax Multi-Region

US / DE / UK / FR estate tax compared

Digital Estate Planner

Passwords + accounts + crypto when you die

Age Calculator

Calculate exact age in years, months, days, hours

BMI Calculator

Body Mass Index — metric and imperial

Tip Calculator

Calculate tips and split bills between people

Temperature Converter

Celsius ↔ Fahrenheit ↔ Kelvin — instant

Length Converter

Meters, feet, inches, kilometers, miles and more

Weight Converter

Kilograms ↔ pounds ↔ ounces ↔ grams

Countdown Timer

Count down to any date or time — live

Calorie Calculator (TDEE)

Daily calorie needs using Mifflin-St Jeor formula

Compound Interest Calculator

See how money grows over time — with monthly contributions

Solar Panel ROI Calculator

Payback period + lifetime savings of solar panels

EV vs Gas Cost Calculator

Compare 5-year total cost: electric vs gasoline car

Carbon Footprint Calculator

Estimate your annual CO2 emissions

Intermittent Fasting Timer

Track 16:8, 18:6, OMAD, 5:2 — all protocols

Macro Calculator

Protein, carbs, fat for your fitness goal

A/B Test Significance Calculator

Is your A/B test result statistically significant?

Timezone Meeting Finder

Find a time that works for global teams

Schengen 90/180 Calculator

Track Schengen Area stays for digital nomads

Scientific Calculator

Full scientific calculator — trig, log, exp, memory

Area Calculator (All Shapes)

Area of rectangle, circle, triangle, polygon + more

Cooking Conversion Calculator

Cups to ml to tbsp to oz — all cooking units

Pool Volume Calculator

Gallons or liters for any pool shape

Pythagorean Theorem Calculator

a squared plus b squared equals c squared

Circle Calculator

Radius, diameter, circumference, area from any input

Fraction Calculator

Add, subtract, multiply, divide fractions

Roman Numerals Converter

Convert numbers to Roman and back

Dog Age Calculator

Convert dog age to human years (breed-aware)

Running Pace Calculator

Pace, time, distance — all three connected

Concrete Volume Calculator

Cubic yards or meters plus bags of cement

Paint Calculator

Gallons or liters needed for any room

BTU Calculator (AC Heater Sizing)

AC or heater BTU needed for any room

Wire Size AWG Calculator

AWG size for any current, distance, voltage drop

Voltage Drop Calculator

Voltage loss over wire length

Ohms Law Calculator

V = I times R — solve for any of the three

Fuel Economy Calculator

MPG, L per 100km, km per L + trip cost

Tire Size Calculator

Compare two tire sizes — diameter, speedo error

Periodic Table Interactive

Click any element — atomic data, properties, uses

Molar Mass Calculator

Molecular weight from any chemical formula

Chemical Equation Balancer

Auto-balance any chemical reaction

Volume Calculator (3D Shapes)

Cube, cylinder, sphere, cone, pyramid, prism

Trigonometry Calculator

sin, cos, tan + inverse functions

Pregnancy Due Date Calculator

Due date + week-by-week trimester

Quadratic Equation Solver

Solve ax squared + bx + c = 0

Right Triangle Solver

All sides and angles from any 2 inputs

Standard Deviation Calculator

sigma, variance, mean, median for any dataset

ABV Calculator (Brewing)

Alcohol by volume from OG and FG readings

Stair Calculator

Rise, run, stringer length for any staircase

Tile Calculator

Tiles + waste needed for any floor/wall

Roofing Calculator

Shingle bundles and square footage for your roof

Lumber Board Feet Calculator

Board feet from length, width, thickness

Flooring Calculator

Boxes of flooring needed for any room

Drywall Calculator

Sheets, screws, mud, tape for any room

Deck Calculator

Joists, deck boards, footings for any deck

Fence Calculator

Posts, panels, rails, concrete for any fence

Gravel / Mulch Calculator

Cubic yards of gravel, mulch, or topsoil

Wallpaper Calculator

Rolls of wallpaper for any room

Torque Calculator

Torque = Force × Distance (N·m, ft·lb)

Bolt Torque Calculator

Torque spec for any bolt grade + size

Gear Ratio Calculator

Ratio, speed, torque across gear sets

Belt Length Calculator

V-belt or timing belt length from pulley geometry

Stress / Strain Calculator

σ = F/A, ε = ΔL/L, Young’s modulus

Tap Drill Size Chart

Pilot hole size for any tap thread

Cutting Speed Calculator

RPM from surface speed and tool diameter

Resistor Color Code Calculator

4, 5, 6 band resistor color → value

LED Resistor Calculator

Current-limiting resistor for any LED

Battery Capacity (Ah to Wh)

Convert between Ah, Wh, mAh, runtime

kW / kWh / HP Converter

Power units — watts, kilowatts, horsepower

Series / Parallel Resistance

Combined resistance of any resistor network

Motor Power Calculator

Electric motor power, current, efficiency

Force Calculator (F=ma)

Newton’s second law — force, mass, acceleration

Density Calculator

ρ = m / V — mass, volume, density any two

Projectile Motion Calculator

Trajectory, range, time-of-flight, max height

Kinetic / Potential Energy

KE = ½mv², PE = mgh — energy calculations

pH Calculator

pH from [H⁺] concentration, pOH, pKa/pKb

Molarity Calculator

Molarity = moles / liters — lab solution prep

Dilution Calculator (C1V1=C2V2)

Stock to working concentration — lab dilutions

Body Roundness Index (BRI)

BMI is outdated — BRI is 2024 science

Personal Carbon Footprint Pro

Scope 1 + 2 + 3 with DEFRA factors

Solar + Battery + Inverter Sizer

Complete off-grid system in one shot

Heat Pump Room-by-Room Sizer

BTU per room with climate zone

EV Range — Real Conditions

Temp + terrain + AC + age = honest range

Insulation R-Value Loss Calculator

Heat loss + payback period for upgrades

Beekeeping Hive Calculator

Honey yield + frames + winter survival

Sous-Vide Time + Temp Calculator

Food safety × texture × thickness

Kombucha Brew Timer

pH curve, sugar, second-fermentation

Sourdough Hydration + Timing

Bakers percentage, fermentation timing

Pizza Dough Hydration Calculator

Neapolitan, NY, Roman — different math

Cocktail Dilution Calculator

Stir time, ice melt, target ABV

BBQ Smoking Wood Calculator

Wood × meat × time = perfect smoke

TikTok Coin / Diamond Calculator

Live gifts → real € after Apple/Google cut

YouTube AdSense by Niche

Real RPM data — not the inflated guess

Twitch Sub Revenue Net Calculator

After Twitch cut + tax + payment fees

Patreon Tier Pricing Optimizer

Psychological pricing for max conversion

Shopify Real Profit Calculator

After ALL fees: Stripe + Shopify + apps + ads

Stripe / Payment Fee Calculator

Cross-region fees + currency conversion

Launch Day Master Audit

SEO + Perf + A11y + Security + Legal in 1

Content Production Pipeline

Topic → Title → Desc → Tags in one flow

AI Image Asset Pipeline

Prompt → Cost → Aspect → Size → CDN

Compliance Master Stack

EU AI Act + GDPR + Cookies + ePrivacy in 1

Video Production Stack

Story → Cost → Voice → Format

AI Stack Real Cost Total

Models + Embeddings + Vector DB + Compute

Personal Health Multi-Score

6 metrics from 1 input set: BMI/BRI/BMR/TDEE...

SaaS Health Dashboard

ARR + churn + CAC + LTV + Magic Number

Relocation Decision Calculator

City A → City B: full picture

Marketing Budget Allocator

Auto-split: SEO/Ads/Content/Tools

Metabolic Adaptation Calculator

Why diet stalls — TDEE drops 5–15% after weight loss

Tolerance Stack-Up Analyzer

RSS + worst-case for assembly tolerance

Sheet Metal Bend Allowance Calculator

K-factor, BA, BD — flat pattern length

CNC Feed & Speed Optimizer

SFM, IPM, RPM — by tool + material

Welding Heat Input Calculator

kJ/mm — voltage × current ÷ travel speed

Pipe Pressure Drop Calculator

Darcy-Weisbach friction loss in pipes

Engineering Material Property Lookup

Density, yield, modulus — 30+ common materials

HRV Recovery Score Interpreter

Paste 7-day HRV — see recovery + readiness

Sleep Debt Calculator

Cumulative sleep deficit over 14 days

Glucose Spike Predictor per Food

GI + carbs + protein → spike estimate

Hydration Needs Calculator (Climate-Aware)

Beyond "8 glasses" — body + climate + activity

Vitamin D Sun Exposure Calculator

Latitude + season + skin = mins needed

Activity to Steps Equivalent

Convert any activity to step-count equivalents

Life Percentage Left Calculator

Brutal truth: how much of life remains?

Hearing Age Test (Frequency Sweep)

Live audio — what age are your ears?

Reaction Time vs Age Cohort

5-round test — how fast are your reflexes?

Travel-Day Bundle (Mobile-First)

Visa + currency + plug + tip + roaming in one tap

Heart Rate via Phone Camera

PPG via flash + camera — mobile-only, no wearable needed

PHQ-9 Depression Self-Screen

Validated 9-question scale — score + crisis resources

GAD-7 Anxiety Self-Screen

Validated 7-question generalized anxiety screen

Burnout Self-Screen (Oldenburg)

Exhaustion + disengagement — 16 items

ADHD ASRS Adult Self-Screen

WHO-validated 6-item ADHD screening

STOP-BANG Sleep Apnea Screen

Validated 8-question sleep apnea risk

ACE Childhood Trauma Score

10-question Adverse Childhood Experiences

Carbon Decision Impact Ranker

Which lifestyle change cuts most CO2? Ranked by impact

Paris 1.5°C Personal CO2 Budget

Your share of remaining global carbon budget

Meal Carbon Tracker

CO2 per meal — beef vs chicken vs plant

Flight vs Alternative CO2

Train, bus, EV, video-call alternatives

Home Renovation CO2 Payback

Insulation/heat-pump CO2 break-even years

Secondhand vs New Impact

Clothes, electronics, furniture CO2 saved

EU vs China EV Comparator

BYD/NIO vs VW/BMW — tech, software, price honest

EV Charging Time — Realistic

Real 10→80% with charge curve, weather, pre-conditioning

EV Battery State-of-Health Predictor

SoH from age + cycles + charging habits

V2G (Vehicle-to-Grid) ROI Calculator

Can your EV earn money as home battery?

BEV vs PHEV vs Hybrid TCO

3-way 5-year cost comparison

EV Charging Network Coverage Score

Tesla SC vs Ionity vs Allego — where you actually drive

Motor Efficiency Class IE1-IE4 ROI

Premium efficiency motor lifecycle savings

VFD Energy Savings Calculator

Variable Frequency Drive ROI for pumps/fans

Three-Phase Motor Sizing Calculator

kW + V + cos φ + efficiency → current + protection

Cable Sizing per IEC 60364

Voltage drop + ampacity + derating

Heat Sink Thermal Calculator

Junction temp from thermal resistance R_θ

PCB Trace Width Calculator (IPC-2221)

Current vs trace width vs temp rise

Phone Performance Live Test

CPU + GPU + RAM benchmark in your browser

Phone vs Cohort Benchmark

Your phone vs avg same-age devices

Mobile Storage Smart-Cleanup Advisor

What to delete first for max GB freed

Cooking Conversions (Precise per Ingredient)

100+ ingredients: cup ↔ g ↔ ml ↔ oz

Recipe Substitution Helper

Out of eggs? Lemon juice? Get smart swaps

Visa Requirements by Citizenship

Country pairs — visa-free, e-visa, embassy required

Pomodoro Timer

Focus timer with work & break intervals — track your productivity

Online Stopwatch

Precise stopwatch with lap times — millisecond accuracy

JSON Formatter

Format, validate & minify JSON in your browser

Regex Tester

Test regular expressions in real-time

Base64 Encoder / Decoder

Encode or decode Base64 instantly

JWT Decoder

Decode JSON Web Tokens — 100% client-side

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

URL Encoder / Decoder

Encode or decode URL-safe strings instantly

UUID Generator

Generate v4 UUIDs — cryptographically random

Unix Timestamp Converter

Convert between Unix timestamps and human dates

Color Picker & Converter

Pick colors and convert HEX ↔ RGB ↔ HSL

Markdown Editor

Write Markdown with live HTML preview

SQL Formatter

Format and beautify SQL queries

CSS Gradient Generator

Design linear and radial CSS gradients visually

AI Text Detector

Detect AI-generated text with rule-based heuristics

AI Token Counter

Count tokens for GPT-4, Claude, Gemini — with cost estimates

Tiktoken Visualizer

See your text tokenized — colorful, instant, for GPT/Claude/Gemini

Multi-Model AI Comparator

Compare GPT-4, Claude, Gemini — tokens + costs side-by-side

PII Scrubber

Remove personal info before sending text to AI

API Key Leak Detector

Scan text or files for leaked API keys — 20+ providers

ChatGPT Export Viewer

View and search ChatGPT/Claude conversation exports

Regex Explainer

Explain any regular expression in plain English

Password Breach Checker

Check if your password has been in a data breach

AI Hallucination Checker

Flag likely hallucinations in AI-generated text

Battery Health Live Checker

Live battery status + charge cycles forecast

Network Quality Live Test

Real RTT + jitter + packet loss measurement

Display PPI / Resolution Detector

Pixel density, screen size, color depth — live

Display Color Accuracy Tester

Test RGB, gradients, calibration patterns

Microphone Frequency Response Test

Live FFT analysis of your mic input

Screen Refresh Rate Detector

Detect 60Hz, 120Hz, 144Hz via rAF

Screen Recorder

Record your screen, camera, or both — no install needed

AI Regex Builder

Describe what you want in plain English — get the regex

Cron Expression Builder

Build cron expressions visually — see next 10 run times

Git Commit Message Generator

Generate conventional commit messages from your changes

API Response Tester

Test API endpoints — send requests, see responses & latency

Data Broker Removal Tracker

DIY checklist — 30+ data brokers + opt-out URLs

Password Breach Pattern Check

Heuristic check — common-pattern detector, fully local

Phishing URL Heuristic Score

Suspicious patterns in any URL — instant score

Digital Footprint Self-Audit

How exposed are you online? 20-question audit

File Metadata Risk Checklist

EXIF + Office metadata — what leaks before you share

Browser Fingerprint Live Test

See exactly what trackers learn from your browser

Internet Speed Test

Test your download & upload speed — ping, jitter & connection quality

What's My IP

See your public IP address, location, ISP & connection details

Favicon Generator

Generate favicons from image, text or emoji — all sizes & formats

Barcode Generator

Generate barcodes — Code 128, EAN-13, UPC-A, Code 39 & more

Online Whiteboard

Collaborative drawing board — freehand, shapes, text & sticky notes

Flowchart Maker

Build flowcharts visually — drag & drop shapes, connectors & text

Word Counter

Count words, characters, sentences & reading time instantly

Case Converter

UPPERCASE, lowercase, Title Case, camelCase & more

Password Generator

Strong, random passwords — generated in your browser

Lorem Ipsum Generator

Placeholder text in words, sentences or paragraphs

Text Diff Checker

Compare two texts and highlight the differences

Reverse Text

Reverse characters, words, or flip lines upside-down

URL Slug Generator

Convert titles to SEO-friendly URL slugs

AI Output Humanizer

Make AI-written text sound more human — rule-based, instant

Prompt Enhancer

Transform basic prompts into structured, high-quality prompts

Prompt Library

60+ curated AI prompt templates — ready to copy

AI Resume Builder

Build a professional resume in minutes — download as PDF

Email Signature Generator

Create beautiful HTML email signatures in seconds

AI Paraphrasing Tool

Rewrite text in 5 different styles — instant & private

Grammar Checker

Check grammar, spelling & readability — free Grammarly alternative

Plagiarism Checker

Detect duplicate content with text fingerprinting

AI Presentation Maker

Turn markdown into beautiful slide decks — export HTML & PDF

AI Writing Humanizer

Make AI-generated text sound natural and human

Emoji Picker

Browse & copy emojis — search 1800+ emojis by name or category

Typing Speed Test

Test your typing speed & accuracy — WPM, CPM & error tracking

Digital Signature

Draw or type your signature — download as transparent PNG

Mind Map Maker

Create mind maps visually — drag, connect & organize ideas

QR Code Generator

Create QR codes for URLs, text, WiFi or anything

Image Compressor

Reduce image file size without losing quality

Image Resizer

Resize images by pixels or percentage

Image Format Converter

Convert between JPG, PNG, WebP, AVIF

Image Cropper

Crop images to any aspect ratio

Background Remover

Remove image backgrounds instantly — 100% in your browser

AI Image Upscaler

Upscale images 2× or 4× with AI enhancement

Video Compressor

Compress videos up to 90% smaller — right in your browser

AI Logo Generator

Generate unique logos from templates — download SVG & PNG

Brand Identity Generator

Generate color palette, typography & social kit from a brand name

Image All-in-One

Compress, resize, convert, crop & watermark in one tool

Color Palette from Image

Extract dominant colors from any image — get hex, RGB & HSL

Image to Text (OCR)

Extract text from images — supports screenshots, photos & scanned docs

Photo Editor

Edit photos in your browser — crop, resize, filters, adjust & draw

Meme Generator

Create memes with custom text — classic templates or upload your own

Video to GIF

Convert video clips to animated GIFs — trim, resize & optimize

GIF Maker

Create animated GIFs from images — set speed, size & loop

Photo Collage Maker

Create photo collages — grids, layouts & custom arrangements

PDF Merger

Combine multiple PDFs into one file

PDF Compressor

Reduce PDF file size while keeping quality

PDF Splitter

Extract pages or split PDF into parts

JPG to PDF

Convert one or many images into a single PDF

PDF to JPG

Extract every page as a JPG image

PDF to Word Converter

Convert PDF files to editable Word documents

Word to PDF Converter

Convert Word documents to PDF instantly

PDF Editor

Edit PDFs in your browser — add text, highlight, sign & annotate

Text to Speech

Convert text to natural speech — 50+ voices, download as audio

Speech to Text

Transcribe speech to text in real time — supports 40+ languages

Audio Recorder

Record audio from your microphone — download as WAV or WebM

Audio Trimmer

Trim and cut audio files — visual waveform editor

Audio Converter

Convert audio between MP3, WAV, OGG & more formats

Voice Changer

Record or upload audio and apply fun voice effects

Audio Joiner

Merge multiple audio files into one — drag to reorder

Noise Remover

Reduce background noise from audio recordings

Online Metronome

Precise BPM metronome with tap tempo and time signatures

Tone Generator

Generate precise audio frequencies — sine, square, sawtooth waves

27 deutsche Tools — Bußgeld, Elterngeld, Steuer & mehr

Specialized tools for German residents (DACH-region only)

🔒

Private

Runs entirely in your browser

⚡

Instant

No upload, no wait, no signup

♾️

Unlimited

No limits, no watermarks, ever

📱

Works offline

Install as PWA for one-tap access

Questions

What is Toololis?

Toololis is a collection of 498+ free utility tools — PDF, image, developer, calculator, and text tools. Every tool runs entirely in your browser.

Are these tools really free?

100% free with no usage limits, no watermarks, no account, no paywall. Supported by non-intrusive display advertising.

Do I need to upload my files?

No. Every tool runs in your browser. Your files, text, and data stay on your device.

How many tools does Toololis have?

498+ tools across 5 categories: PDF, Image, Developer, Calculator, and Text. New tools are added regularly.

Do the tools work on mobile?

Yes — built mobile-first. Works on phones, tablets, and desktop. Install as a PWA for one-tap access.

Is Toololis open source?

Source is on GitHub. Uses pdf-lib, pdfjs-dist, qrcode, diff, js-md5 under MIT/Apache licenses.