Convert JPG to AVIF
Free, unlimited JPG to AVIF conversion that runs entirely inside your browser. No upload, no sign-up, no watermark.
Convert your JPG files to AVIF
or drop them here, or paste with Ctrl+V · files never leave your device
Settings
Nothing queued yet. Add as many files as you like — everything runs on your own device.
Nothing is uploaded
Conversion runs in your browser. Your files never touch a server, so there is no copy of them to leak.
No sign-up, no watermark
No account, no email, no daily limit, and nothing stamped across your image.
Batch and folders
Drop a hundred files at once and download the results as a single ZIP.
Works offline
Once this page has loaded you can disconnect entirely and it still works.
This converter turns JPG images into AVIF files without uploading anything. The conversion runs inside this page using your own device's processor, so your photos never leave your computer — there is no server copy to worry about, no queue to wait in, and no limit on how many files you convert.
JPG is the lossy photographic format that has been the default for digital cameras and the web since 1992. Universal. If a program can open an image at all, it can open a JPG. AVIF, by contrast, all current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted.
Converting to AVIF is a page-speed exercise: it typically cuts image weight by a third or more with no visible difference, which shows up directly in Core Web Vitals. Keep the original JPG as your master copy and serve the AVIF version.
How to convert JPG to AVIF
- Add your JPG files. Drag them onto the box above, click to browse, or paste an image straight from your clipboard. You can add as many at once as you like.
- Adjust the settings if you need to. The defaults suit most images. Raise the quality slider if the image contains text or flat colour.
- Download the AVIF file. Each file gets its own download button as soon as it finishes, and you can pull the whole batch down as a single ZIP.
What changes when you convert JPG to AVIF
Every format conversion involves trade-offs, and vague tools hide them. Here is exactly what happens to your image in this particular conversion.
- Both formats are lossy, so the file is being re-compressed. We decode JPG at full fidelity and re-encode once at your chosen quality, which keeps generational loss to a minimum, but converting back and forth repeatedly will visibly degrade an image.
- AVIF encoding is genuinely slow — it runs the AV1 compressor in your browser. A large photo can take several seconds. The payoff is a file substantially smaller than the equivalent JPG.
What happens to the file size
Measured, not estimated: two 1200 x 800 pixels references — a photograph and a flat-colour graphic — put through this converter.
| Reference image | As JPG | As AVIF | Change |
|---|---|---|---|
| Photograph | 211 KB | 99 KB | -53% |
| Graphic with text | 21 KB | 4 KB | -82% |
Yours will differ: size depends more on what is in the picture than on the formats involved.
About JPEG (Joint Photographic Experts Group)
JPG is the lossy photographic format that has been the default for digital cameras and the web since 1992.
Where you probably got it: Photos from cameras, phones, and almost any website.
Strengths
- Opens in literally every image viewer, editor, printer and web form ever made
- Very small files for photographs, with a quality dial you control
- Hardware-accelerated decoding on every phone and camera
Limitations
- No transparency — transparent areas have to be flattened onto a solid colour
- Lossy: each re-save discards a little more detail permanently
- Blocky artefacts around sharp edges, text and flat colour
About AVIF (AV1 Image File Format)
AVIF is a modern format built on the AV1 video codec, producing the smallest files of any widely supported image format.
Support: All current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted.
Strengths
- Typically 30–50% smaller than JPG at visually identical quality
- Handles transparency, HDR and wide colour gamut
- Royalty-free and supported in all current browsers
Limitations
- Encoding is computationally expensive — noticeably slower than JPG or PNG
- Very little support outside browsers: most desktop and print software cannot open it
- Can smear fine texture at aggressive settings
Is it safe to convert JPG online?
Here, yes — and you can check rather than trust. Open your browser’s developer tools, switch to the Network tab and convert a JPG file: no request carrying your image is made. Disconnect from the internet after this page has loaded and the converter still works, which would be impossible if a server were doing the conversion.
That is worth verifying wherever you convert, because most online converters do upload, and JPG files are so often scans of passports, driving licences and signed forms, which is most of what gets converted to send somewhere. Once a file is on somebody else’s server you are relying on a privacy policy rather than on anything you can observe. We wrote up how to tell a safe converter from a risky one in more detail.
Frequently asked questions
How do I convert JPG to AVIF?
Drag your JPG file onto the box above, or click it to browse. The conversion starts immediately in your browser and the AVIF download appears within a second or two for most images. You can drop in a whole folder of files at once and download them together as a ZIP.
Are my JPG files uploaded to a server?
No. The conversion happens locally in your browser, so your files are never transmitted anywhere — the tool even works with the network disconnected once the page has loaded. That is also why there is no file size or file count limit: nothing costs us anything per conversion. The practical ceiling is your own device's memory, which on a phone means very large images may fail.
Will converting JPG to AVIF reduce the quality?
A little. Both formats are lossy, so the image is decompressed and re-compressed once. We decode at full fidelity and encode a single time at your chosen quality, so a one-off conversion is close to invisible — but avoid converting the same image back and forth repeatedly.
What is the difference between JPG and AVIF?
JPG is the lossy photographic format that has been the default for digital cameras and the web since 1992. AVIF is a modern format built on the AV1 video codec, producing the smallest files of any widely supported image format. In practice the choice comes down to compatibility: universal. If a program can open an image at all, it can open a JPG. Meanwhile all current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted.