Optimize Images as AVIF
Feed in JPG, PNG, WebP or AVIF and get AVIF files tuned to look identical to the source at the smallest size Pixellin can find.
- On-device
- No sign-up
- Batch
- Free, no watermark
Drop images on the plate
or paste with Ctrl/⌘ V
Processed on this device
How it works
- 01Drop, choose or paste JPG, PNG, WebP or AVIF images.
- 02Optionally set a long-edge cap of 1920, 2560 or 3840 px.
- 03Select Process and allow a few seconds per large photo.
- 04Download each AVIF or select Download all for a ZIP.
Why use this tool
Any common format in
JPG, PNG, WebP and existing AVIF files are all accepted, so you can move a mixed library to AVIF in one batch.
Tuned by perception
Each image is tested at several AVIF qualities and scored with SSIM, so you don’t need to learn AVIF quality settings.
Background encoding
AVIF encoding runs in a background worker. Large photos can take a few seconds each, which is normal for this format.
Supported formats
Use cases
Modern image pipelines
Generate AVIF versions of hero images to serve alongside JPG or WebP fallbacks in a picture element.
Photography portfolios
Large, detailed photos are where AVIF shines. Optimize a portfolio set to keep its look while cutting the bytes visitors download.
Storage-limited hosting
Sites on hosting plans with tight storage or bandwidth limits can keep AVIF copies that take up less space.
Technical details
Unlike Optimize JPG, PNG and WebP, this page changes the format: any JPG, PNG, WebP or AVIF goes in, and AVIF comes out. Pixellin encodes several candidates, measures each against the source with SSIM, and keeps the smallest that stays above the visually identical threshold. That replaces the trial and error of picking an AVIF quality value by hand, and it works per image, so each file gets its own setting.
AVIF encoding is slower than JPG or WebP, often a few seconds per large photo, and runs in a background worker. Metadata is stripped and the long edge can be capped. Check where the files will be used: current browsers display AVIF, but some older apps and editors can’t open it, so keep a JPG or WebP fallback. See AVIF vs WebP for help choosing.
Your files stay with you
This tool runs entirely inside your browser using Web Workers and WebAssembly. Your images are never uploaded, never stored on a server and never used to train AI. Close the tab and they’re gone. Learn more
Frequently asked questions
How do I convert and optimize images to AVIF?
Add JPG, PNG, WebP or AVIF files here and select Process. Each one is encoded as AVIF at several quality levels, and the smallest result that still looks identical to the source is kept. Download the AVIFs individually or as a ZIP.
Why is AVIF encoding slow?
AVIF uses a more complex compression method than JPG or WebP, which takes more computation, and optimization encodes several candidates per image. Large photos can take seconds each. The work runs in a background worker inside your browser.
Is AVIF smaller than WebP?
Often, especially for photos, but not always; results depend on the image. Because this optimizer measures every candidate, you get the smallest AVIF that looks identical. Compare it with your WebP and keep whichever works better for your site.
How is this different from Convert to AVIF?
Convert to AVIF uses a quality slider you set, with a default of 60. Optimize AVIF picks the quality for each image automatically using SSIM and strips metadata. Choose the converter for a fixed setting and the optimizer for the smallest visually identical file.
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