Convert Image Format
Convert images between JPG, PNG, WebP, and AVIF formats online for free. Batch convert up to 50 files instantly, 100% private, no uploads, no signup.
About This Tool
Convert your images between JPEG, PNG, WebP, and AVIF formats instantly. Need a transparent PNG from a JPEG? Want to save bandwidth with WebP? Converting formats is the fastest way to optimize your images for any use case. The entire conversion happens in your browser, no uploads, no waiting for servers, no privacy concerns. Batch convert up to 50 images at once.
How To Use
- Upload your images by dragging them into the drop zone or clicking to browse.
- Select your desired output format from the dropdown menu.
- Adjust the quality slider if you want to control the file size vs. quality tradeoff.
- Click "Convert" and download your converted images.
How It Works
Format conversion uses the browser's native Canvas API to decode your image into raw pixels and then re-encode it in your chosen format. The Canvas API supports JPEG, PNG, and WebP natively in all modern browsers. AVIF support depends on your browser, Chrome and Firefox support it, while Safari has limited support.
When converting to JPEG, transparency is replaced with a white background since JPEG doesn't support alpha channels. Converting to PNG always produces a lossless result regardless of the quality slider setting, since PNG compression is lossless by nature. WebP and AVIF offer the best compression ratios for photographs while maintaining excellent quality.
The quality slider controls the compression level for lossy formats. At 90%, most images are visually indistinguishable from the original. Below 70%, compression artifacts may become visible, especially in areas with smooth gradients. The processing happens in a Web Worker to keep your browser responsive, and files are processed one at a time to conserve memory.
Frequently Asked Questions
Which format should I choose?
Use WebP for the best balance of quality and file size on the web. Use JPEG for maximum compatibility. Use PNG when you need transparency. Use AVIF for the absolute smallest files, but check browser support.
Will I lose quality when converting?
Converting to PNG is always lossless. Converting to JPEG, WebP, or AVIF involves lossy compression, set quality to 95-100% for virtually no visible quality loss, or lower for smaller files.
Does converting JPEG to PNG improve quality?
No. Converting a lossy format to a lossless format preserves the current quality but cannot recover information already lost during the original JPEG compression. The file will actually get larger.
What about transparency?
PNG, WebP, and AVIF all support transparency. JPEG does not, transparent areas will be filled with white when converting to JPEG. If transparency is important, avoid JPEG output.
Is AVIF supported in all browsers?
AVIF export works in Chrome 121+ and Firefox 113+, but not in Safari as of mid-2025. We detect support automatically and show a clear message if your browser cannot export AVIF.
How many images can I convert at once?
You can convert up to 50 images in a single batch. Each file can be up to 50MB. Files are processed sequentially to ensure stable performance on all devices, including mobile phones.