How it works
- Drop your files in the zone above (or click it, or paste with Ctrl+V).
- They convert instantly, right in your browser — nothing is uploaded.
- Adjust quality or max width if needed; files reconvert automatically.
- Download files one by one, or everything at once as a ZIP.
About the formats
AVIF
AVIF is the newest mainstream image format, built on the AV1 video codec. It beats WebP and JPG on compression, but software support outside modern browsers is still limited, so AVIF files frequently need converting for everyday use.
WebP
WebP is Google's image format for the web, offering smaller files than JPG and PNG with both lossy and lossless modes plus transparency. Browsers handle it well, but plenty of desktop software, older tools and upload forms still reject it — which is why images saved from the web often need converting.
What this conversion actually gives
Measured with the converter on this page, on a 2016 × 1512 px test image: the AVIF file weighs 200 KB.
| Setting | Result | Change |
|---|---|---|
| Quality 85 % (default) | 281 KB | +41 % |
| Quality 60 % | 123 KB | −39 % |
| Max width 1600 px, quality 85 % | 201 KB | +0 % |
Converting to WebP makes the file bigger here (+41 %): AVIF relies on a newer, more efficient codec than WebP: at comparable quality, WebP simply needs more room.
For an email attachment, quality 60 % brings it down to 123 KB. Capping the width at 1600 px gives 201 KB — plenty for any screen.
Your own files will differ — a photo full of detail compresses less well than a flat graphic. These figures come from one reproducible test image, not from an average.
Frequently asked questions
How big will my WebP file be?
On our 2016 × 1512 px test image, a AVIF of 200 KB comes out at 281 KB at the default quality (+41 %). Lower the quality slider or set a maximum width and the figure drops further — the page shows the new size as soon as the file is reconverted.
Why can't my photo editor open AVIF files?
AVIF is recent (2019) and many editors haven't added decoders yet. Your browser already decodes it though — which is exactly what this tool uses to convert it into a format your editor understands.
Why convert to WebP?
WebP gives the same visual quality as JPG or PNG at roughly 25–35% smaller file size, supports transparency, and is read by every modern browser — the best choice for fast-loading websites.
Are my files really private?
Yes. The conversion runs entirely in your browser using its built-in image engine. Your files are never uploaded, stored or seen by any server — you can even disconnect from the internet after the page loads and keep converting.
Is this free? Is there a file limit?
Completely free, no account, no watermark. Convert as many files as you like, up to 200 MB each — the only limit is your device's memory.
Can I convert many files at once?
Yes — drop a whole batch at once. Each file converts independently and you can grab everything in a single ZIP when done.