Image Format Converter Guide
Convert a picture between JPEG, PNG, WebP and AVIF, with a quality slider and a before-and-after size.
Image Format Converter re-encodes a picture into another format inside your browser. JPEG, PNG and WebP are always offered; AVIF appears only when the browser can actually write it. The Change line shows whether the new file is smaller or larger.
Convert a throwaway image
Choose a disposable image under Image, leave Convert to on JPEG, and read Input, Output and Change. Switch Convert to to PNG; Output should now say PNG and Change often flips to % larger, because PNG is lossless. Move Quality down to 40 with JPEG or WebP selected and the output gets smaller. Choose Download to save the file with the matching extension.
If the list shows AVIF (not supported here), that browser cannot encode AVIF even if it can display it; pick another format. JPEG cannot store transparency, so this tool paints a white layer under the picture first, which means a transparent PNG converted to JPEG picks up a white background. As with any re-encode, EXIF metadata does not carry over.
Where your input goes
Processing runs in your browser. The tool does not upload your input to ilham.dev.
Related guide
For more background, read Practical Image Tools.
Questions you might have
- Why is AVIF marked as not supported?
- Encoding AVIF is left to the browser, and some browsers can decode it without being able to write it. The page encodes one pixel and checks what format comes back before offering the choice.
- What happens to transparency in a JPEG?
- JPEG has no alpha channel, so a transparent area has to become something. A white layer is laid down first, which is the usual choice for a photo going to a place that expects a solid background.
- Which format should I pick?
- Photographs are usually smallest as WebP or JPEG. Screenshots, diagrams and anything with text or a transparent background hold up better as PNG, and the size shown for each choice makes the trade visible.