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Image Format Converter — Free Online Tool

Convert between JPG, PNG, WebP, AVIF

Convert images between JPG, PNG, WebP, AVIF formats. Free, instant, runs entirely in your browser.

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Free image format converter — JPG, PNG, WebP, AVIF

Toololis Image Converter changes image format in your browser using the Canvas API. Batch convert multiple files. Adjust quality for lossy formats. Outputs download directly — no signup, no watermarks.

Format comparison (2026)

  • JPG — Universal support. 1990s format, still the default for web photos. No transparency.
  • PNG — Lossless, supports transparency. Large file sizes for photos.
  • WebP — Google\'s 2010 format. 30% smaller than JPG at same quality. Supports transparency + animation. Universal browser support.
  • AVIF — Modern (2019). 50% smaller than JPG at same quality. Chrome, Safari, Firefox all support it.

How to use this tool

  1. 1

    Drop or pick an image

    Any JPG, PNG, WebP, AVIF, BMP, or GIF works. Drop multiple files for batch conversion.

  2. 2

    Choose target format

    Pick JPG, PNG, WebP, or AVIF. Adjust quality for lossy formats (JPG, WebP, AVIF).

  3. 3

    Download converted images

    Every image gets its own download button. Source images stay on your device — nothing uploaded.

Common conversion needs

  • PNG → JPG — Shrink screenshots before email/attachment
  • JPG → WebP — Modernize website images for 30% faster loads
  • GIF → MP4/WebP — GIF is huge; WebP animation is 10× smaller (MP4 is a video, not handled here)
  • Anything → PNG — For designs, logos, anything needing transparency
  • WebP → JPG — Send to apps that don\'t support WebP (older systems)

Frequently Asked Questions

What formats can I convert?
Input: JPG, PNG, WebP, GIF, BMP, AVIF (anything your browser can decode). Output: JPG, PNG, WebP, AVIF (if browser supports encoding it — Chrome/Edge/Firefox do).
Which format should I use?
AVIF for maximum compression (modern browsers only). WebP for broad modern support with ~30% savings vs JPG. JPG for maximum compatibility. PNG for lossless graphics with transparency.
Does JPG have transparency?
No — JPG does not support transparency. Converting a PNG with transparent areas to JPG fills the transparent parts with white. Use PNG or WebP if you need transparency.
Is quality lost when converting?
For lossy targets (JPG/WebP/AVIF): some quality loss at each conversion. For lossless (PNG): no pixel loss, but may lose some metadata. Best practice: keep originals, only convert for distribution.
Can I convert HEIC photos from iPhone?
Most browsers don't support HEIC decoding natively. If your browser can't read it, try a desktop app first (iOS Photos can export as JPG on share).
Is my image data uploaded?
No. Everything runs via Canvas API in your browser. Perfect for confidential photos, screenshots, or business documents.

Key Takeaways

  • Image Format Converter is a free, browser-based image tool — convert between jpg, png, webp, avif.
  • No 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 Format Converter

  1. Open the tool: Launch Image Format Converter 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 Format Converter — Quick Facts

Price
Free — no limits, no watermarks, no paywalls
Privacy
100% browser-based — no data is sent to any server
Platform
Any modern browser on desktop, tablet, or mobile
Category
Image Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
FeatureDetails
ToolImage Format Converter
CategoryImage
Signup RequiredNo
File UploadNone — processed in browser
Mobile SupportFully responsive
CostFree forever

Why Use Image Format Converter?

You should try Image Format Converter for a quick, private way to convert between jpg, png, webp, avif. 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.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.