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JPG · PNG · WEBP · AVIF · GIF · HEIC
Convert JPG to AVIF
AVIF is roughly half the size of JPG at matched visual quality, which makes it the strongest option for cutting image weight on a site without dropping to a visibly lower quality.
How to convert JPG to AVIF
Drop your JPG files onto the panel above and press Convert. A whole folder at once is fine, and the AVIF files download individually or as a single ZIP.
Quality is the one setting worth a glance, and 85 or above is visually indistinguishable from the original for photographs. Conversion here runs at maximum quality by default, so you only need to touch it if a smaller file matters more than fidelity — and if it does, compressing afterwards gives you finer control.
Nothing is uploaded. The decoders and encoders run as WebAssembly inside this page, which is why there is no file-size limit, no queue, and no copy of your image on anyone's server.
Why convert JPG to AVIF?
AVIF is roughly half the size of JPG at matched visual quality, which makes it the strongest option for cutting image weight on a site without dropping to a visibly lower quality.
Every current browser reads it, including Safari since 16.4, so for images you serve yourself the trade-off is close to free. The costs are elsewhere: encoding is noticeably slower than JPG or WebP, and desktop software outside the browser still lags behind — so AVIF suits the copy that lives on your pages, not the copy you email to someone.
| JPG | AVIF | |
|---|---|---|
| Compression | Lossy | Lossy or lossless |
| Transparency | No | Yes |
| Animation | No | Yes |
| Support | Universal — every browser, OS, app, and print service | Chrome 85+, Firefox 93+, Safari 16.4+ — weaker outside browsers |
| Best for | Photographs, and anything that has to open everywhere | Squeezing the last bytes out of images for a modern website |
What AVIF does to file size
Expect around 50% of the JPG size at comparable quality, sometimes better on smooth, low-noise images.
The JPG has already been through lossy compression, so re-encoding compounds it — conversion runs at maximum quality to keep that to a minimum. Convert from the highest-quality JPG you have, and keep that JPG as a fallback for software that cannot open AVIF.
Frequently asked questions
How do I convert JPG to AVIF?
Drop your JPG files above, choose AVIF as the output, and press Convert. The files are decoded and re-encoded at maximum quality inside your browser, then download individually or as a ZIP — no upload, no account, no watermark.
Does converting JPG to AVIF lose quality?
AVIF is a lossy format, so the image is re-encoded — at maximum quality, where the difference is imperceptible for photographs. The JPG has already been through lossy compression, so re-encoding compounds it — conversion runs at maximum quality to keep that to a minimum. Convert from the highest-quality JPG you have, and keep that JPG as a fallback for software that cannot open AVIF.
Can I just rename the file to .avif?
No. The extension only labels the file, while the bytes inside follow the structure of a specific format. Renaming produces a file most software refuses to open. A real conversion decodes the image and re-encodes it in the new format, which is what happens here.
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