toololis
Zurück Zurück zu Bild
📐

Bild-Größenänderer — Kostenloses Online-Tool

Bilder in Pixel oder Prozent skalieren

Bilder auf beliebige Abmessungen ändern. JPG, PNG, WebP unterstützt. Qualität bleibt erhalten. Browserbasiert, ohne Anmeldung.

📚
Mehr erfahren

Free image resizer — by pixels or percent, aspect-ratio safe

Toololis Image Resizer changes image dimensions in your browser using the Canvas API. Input exact pixel dimensions or a percentage scale. Aspect-ratio lock keeps proportions correct automatically. Nein upload to any server.

How to use this tool

  1. 1

    Upload your image

    Drop or pick a JPG, PNG, or WebP. The original dimensions will appear automatically.

  2. 2

    Enter target dimensions

    Type width, height, or a percentage. Aspect-ratio lock keeps proportions — toggle off to stretch.

  3. 3

    Download the resized image

    Canvas re-renders at the new size and gives you a download link. Quality is preserved for JPG/WebP output.

Common image sizes in 2026

  • Hero banner — 1920×1080
  • Blog featured / OG image — 1200×630
  • Instagram post (square) — 1080×1080
  • Instagram story — 1080×1920
  • LinkedIn banner — 1584×396
  • YouTube thumbnail — 1280×720
  • Favicon — 512×512 (for modern browsers)
  • Profile avatar — 400×400

Frequently Asked Questions

Does resizing reduce quality?
Downscaling (making smaller) barely reduces perceived quality — just fewer pixels. Upscaling (making larger) introduces blur because no new detail exists. For upscaling, use an AI upscaler tool instead.
What resampling algorithm is used?
The browser's built-in canvas rendering uses bilinear/bicubic interpolation automatically. It's the same algorithm Photoshop's "Bilinear" mode uses — good for most cases, preserves edges reasonably.
How is aspect ratio calculated?
From the source image's width-to-height ratio. When locked, changing width automatically updates height (and vice versa). Unlocking lets you stretch the image non-proportionally.
Is my image uploaded anywhere?
Nein. Everything runs in your browser. Safe for private photos, ID scans, or confidential documents.
What are common image sizes?
Web hero: 1920×1080. Blog featured: 1200×630 (also Open Graph). Instagram post: 1080×1080. LinkedIn banner: 1584×396. YouTube thumbnail: 1280×720. Favicon: 512×512.
Can I resize multiple images at once?
Neint currently — this tool processes one at a time for clarity. For batch operations, use the Image Compressor which supports multiple files.

Wichtigste Punkte

  • Image Resizer is a free, browser-based image tool — resize images by pixels or percentage.
  • Nein signup, no downloads, no file uploads — your data stays on your device.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use Image Resizer

  1. Open the tool: Launch Image Resizer on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

Image Resizer — Quick Facts

Preis
Kostenlos — keine Limits, kein Wasserzeichen, keine Paywall
Privatsphäre
100% browser-basiert — keine Daten verlassen dein Gerät
Plattform
Jeder moderne Browser — Desktop, Tablet, Mobil
Kategorie
Image Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
MerkmalDetails
ToolImage Resizer
KategorieImage
Anmeldung nötigNein
Datei-UploadKeine — wird im Browser verarbeitet
Mobile-UnterstützungVoll responsive
KostenFür immer kostenlos

Why Use Image Resizer?

You should try Image Resizer for a quick, private way to resize images by pixels or percentage. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

You might also like

Image All-in-One

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

Open

Image Compressor

Reduce image file size without losing quality

Open

Image Format Converter

Convert between JPG, PNG, WebP, AVIF

Open
🔒
100% Privatsphäre. Dieses Tool läuft komplett in deinem Browser. Deine Daten werden niemals auf einen Server hochgeladen.