AVIF Resizer

Resize AVIF images by exact pixel dimensions or by percentage — directly in your browser. Batch process multiple files at once, lock the aspect ratio to avoid distortion, and download results individually or as a ZIP. Your files are never uploaded.

How to Resize AVIF Images

1. Upload — drag and drop or click to select one or more .avif files.
2. Choose mode — pick Pixels for an exact output size or Percentage to scale proportionally (e.g. 50% = half size).
3. Set dimensions — enter a target width and/or height. With aspect ratio lock on, the other dimension is calculated automatically.
4. Set quality — 85% is a good default. Lower values produce smaller files.
5. Click Resize Images — download individually or grab all as a ZIP.

Why Resize AVIF Images?

AVIF files from cameras or design exports are often much larger than needed for web use. Resizing to the display dimensions is one of the most impactful performance improvements you can make — a 4000×3000 AVIF displayed at 800×600 sends four times as many pixels as necessary.

Common target sizes:

• Blog / article body images: 1200–1600px wide
• Hero images: 1920px wide at 1× (or 960px for 2× retina)
• Thumbnails: 300–600px
• Open Graph / social sharing: 1200×630px

Browser Requirements

Resizing AVIF requires both decoding (displaying) and encoding (saving) support. Decoding works in Chrome 85+, Firefox 93+, and Safari 16+. Encoding requires Chrome 93+ or Firefox 93+. Safari does not support AVIF encoding via the Canvas API.

Frequently Asked Questions

Will resizing change the file format? No — the output files are AVIF. The images are decoded, resized on a canvas, and re-encoded to AVIF using the quality setting you choose.

Does aspect ratio lock work across multiple files? Yes, but the aspect ratio used for auto-calculation is based on the first uploaded image. For multiple images with different aspect ratios, enter both width and height explicitly with the lock off, or each file will be calculated using its own ratio independently.

Are my images uploaded anywhere? No. All resizing is done by your browser using the Canvas API. Your files never leave your device.