Convert images to AVIF
AVIF files are usually another 20–30% smaller than WebP at the same quality. Converting is slow because it is real work, and here that work happens on your own machine.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Drop your images.
- Set the quality. Expect a few seconds per megapixel.
- Convert and download.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine from a public CDN — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
Why is it so much slower than JPG?
AVIF comes from the AV1 video format and searches much harder for ways to shrink the picture. That search is why the files are small, and it takes computing time. A converter website hides this by using its own servers; here it is your machine doing the work, and nothing leaves it.
Should I use AVIF for everything?
For images on a modern website it is usually the best choice. Not for files you send to other people: email clients, office software and older phones may not display them.
Are the images uploaded to convert them?
No. Your browser opens the image, redraws it and saves it in the new format, all on your device. Load the page, switch your connection off and the conversion still works — that is the proof.
Is there a size or batch limit?
None that we impose. Drop a hundred files if you like; they are processed one after another with a progress bar, and the only limit is your device’s memory.
What happens to the hidden photo data (EXIF, GPS location)?
It is removed by default, which is usually what you want before sending a photo to anyone. Tick “Keep EXIF” if you need the date and camera details kept in a JPEG output.