AVIF images to WebP: smaller pages, same picture, nothing uploaded
Processed in your browser. Nothing is uploaded. Updated on 24 Oct 2026.People saving pictures from sites built this decade land here, because support for AVIF arrived only recently, and anything installed a few years ago has never heard of it. WebP settles it: a lighter page without a visible drop in quality. WebP is lossy, so a little detail is thrown away. No account, no upload and no watermark, and the originals on your disk are left untouched.
Choose the AVIF images for a site or app that reads WebP but not AVIF; WebP is already set.
Set the Quality slider; WebP is lossy, and transparency is kept.
If WebP is greyed out, switch to Chrome, Edge, Firefox or Safari 16 and later.
Press Convert to WebP, then Download the .webp files.
Convert Image reads ten formats and writes seven. It opens JPEG, PNG, GIF, WebP, AVIF, BMP, TIFF, ICO, SVG and HEIC, and saves as JPEG, PNG, WebP, AVIF, BMP, TIFF or ICO. Drop up to twenty files in and each row shows the new size beside the old one as it finishes.
The file is identified by its first bytes, never by its name, so a HEIC photo renamed .jpg is still recognised as a HEIC and the page says so before converting it. What it finds is spelled out: "a TIFF image, 3 pages", "a GIF image, 12 frames", "an ICO image, 3 sizes up to 48 px". The target format is already chosen for you, either by the page you arrived on or by what people most often want that format turned into, so the only thing left to do is confirm.
Everything runs on your device. TIFF uses a reader loaded only when a TIFF arrives; HEIC uses a decoder loaded only when a HEIC arrives; an SVG is stripped of anything that could run or fetch and then drawn in an isolated image, at a size you choose. Writing WebP and AVIF depends on the browser, and the tool disables a format it cannot write rather than quietly saving something else. Limits are 20 files per batch and 50 MB per file.
The rest of the article, and all 8 questions about Convert Image, are on the Convert Image page.
Reading works for JPEG, PNG, GIF, WebP, AVIF, BMP, TIFF, ICO, SVG and HEIC; writing works for JPEG, PNG, WebP, AVIF, BMP, TIFF and ICO. That is every pair those two lists allow, about sixty of them, and each pair has its own page with the target format already chosen for you.
Frames are counted the moment the file is dropped, and the first one is kept by default, because a still is what people usually want. Chrome and Edge can read every frame, and there the choice 'All 12 frames' gives you one file per frame. Other browsers can only read the first, and the page says so rather than pretending.
Writing AVIF and WebP is done by the browser, and not every browser can. Chrome and Edge write both; Firefox and Safari often cannot write AVIF. A format this browser cannot write is disabled with a note naming the browsers that can, so nothing is silently saved in the wrong format.
Twenty files per batch and 50 MB per file. Nothing is uploaded: the conversion runs in your browser, the TIFF and HEIC readers load only when one of those files arrives, and the converted files are built on your own device.
Still stuck? Ask about Convert Image and anybody who knows can answer. No account needed.
On the related tools: JPG to PPT – Build a slideshow from JPG photographs in a few seconds · Combine Photos – Put two or more pictures side by side in one image.
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