Convert JPG to AVIF
Converting JPG to AVIF is almost always about weight. AVIF is built on the AV1 video codec and is the most compression-efficient still format that mainstream browsers actually display, so the same photograph usually arrives on a page in a fraction of the bytes JPG needs for it. If you are chasing a Largest Contentful Paint score, trimming a mobile data bill, or fitting more into a storage budget, this is the conversion that buys the most.
Drop your JPG files below and download AVIF in seconds. Free, unlimited and completely private: the conversion runs inside your browser, so your files never leave your device and are never uploaded to a server.
No upload. Works with your network switched off. Check it yourself, or read what actually happens to your file.
Why convert JPG to AVIF?
The honest caveat is generation loss. A JPG has already discarded detail, and encoding it to AVIF compresses what is left a second time, so the result can never be better than the JPG it came from. If the original camera file or an untouched export still exists, encode AVIF from that instead. Converting an existing JPG is still worth doing for delivery, just do not expect it to undo anything JPG already did. It is also worth checking the destination first: AVIF displays in every current browser, but plenty of desktop editors, older CMS installs and upload forms still reject it.
JPG has been the default photo format since the nineties and opens everywhere, from ancient office software to modern phones. Its lossy compression shrinks photos dramatically while keeping them looking good at normal viewing sizes. It cannot store transparency, so transparent areas are filled with a solid background.
AVIF is based on the AV1 video codec and reaches even smaller files than WebP at the same visual quality. All modern browsers can display it, but many image editors and older tools cannot open it yet, which is the main reason people convert AVIF to an older format.
What this converter does to your JPG file
Your browser decodes the JPG, then libavif, compiled to WebAssembly and running on your device, encodes those pixels as AVIF. The encoder is about 3.4 MB and is fetched the first time you convert to AVIF, not when the page loads, so it costs nothing if you never use it. Encoding is a lossy step: the quality slider maps onto libavif's 0 to 100 quality scale, and colour is written as 8 bit with 4:2:0 chroma subsampling, which stores colour detail at half resolution in each direction while brightness keeps its full resolution. On photographs that is invisible. On a hard edge between two saturated colours it is where you would spot it first. JPG holds no transparency, so there is none to preserve, and the output is always a single still frame.
JPG vs AVIF at a glance
| JPG | AVIF | |
|---|---|---|
| Full name | JPEG image | AV1 Image File Format |
| Compression | Lossy | Lossy or lossless |
| Transparency | No | Yes |
| Best for | Photos and general web images | Next generation web images |
What changes when you convert JPG to AVIF
| What happens | |
|---|---|
| Image quality | Reduced. JPG is already lossy and AVIF compresses again, so this is a second encode. Nothing is recovered, and at low quality settings the losses stack. |
| Transparency | JPG has no alpha channel, so there is no transparency to lose. |
| EXIF and GPS | Removed. The conversion goes through a pixel buffer, so camera data and location are not carried into the AVIF file. |
| Colour profile | Not carried across. The image is handled in sRGB, which is right for the web and wrong for colour-managed print work. |
| Animation | Not applicable. JPG files here are single images. |
| File size | Smaller in almost every case, which is the reason for the conversion. How much smaller depends on the picture, so no figure is quoted here. |
How to convert JPG to AVIF
- Drop one or more JPG files into the box above, or click to browse.
- ImageConvert converts each file to AVIF right on your device.
- Download a single file, or grab everything at once as a zip.
Frequently asked questions
Will the AVIF be smaller than my JPG?
Nearly always, and often by a wide margin at the same visual quality, because AVIF's compression is a generation ahead of JPG's. The exception is very small or already heavily compressed images, where AVIF's container overhead can eat into the saving. The file list shows the size before and after every conversion, so you can check rather than take it on faith.
Does converting to AVIF improve my JPG's quality?
No. Nothing can rebuild detail that a lossy JPG already threw away, and encoding to AVIF is itself a second lossy pass. AVIF's advantage is that it holds on to what is there using far fewer bytes, not that it restores anything.
Can I use AVIF on my website yet?
Yes for browsers: Chrome, Firefox, Safari and Edge all display AVIF. The gap is off the web, where older editors, plugins and upload forms often do not recognise it. A common approach is to serve AVIF with a JPG or WebP fallback so that anything which cannot read it still gets an image.
What is a JPG file?
JPG (JPEG) is the most common photo format, using lossy compression for small file sizes.
What is an AVIF file?
AVIF is a next generation format with excellent compression, increasingly used on modern websites.
Is it free to convert JPG to AVIF?
Yes. There are no limits, no watermarks and no account needed. Convert as many JPG files as you like.
Are my files private?
Completely. Your JPG files never leave your browser and are never uploaded to a server, so your images stay on your device.