Conversions

How this works

Every conversion on this site runs inside your browser. The file is read from your disk into the page, decoded, re-encoded and handed back to you as a download. There is no upload endpoint to send it to, which is why there is no size limit and no queue.

Images go through the browser's own image decoders and a set of encoders written for this site. Video and audio go through FFmpeg compiled to WebAssembly, which is the same FFmpeg that desktop tools use, running in the tab.

Picking the right target

• Photographs: JPG for compatibility, WEBP or AVIF for smaller files.
• Screenshots, logos and anything with text: PNG, which keeps edges sharp.
• Anything needing transparency: PNG or WEBP. JPG cannot store it.
• Video for other people: MP4, which plays on everything.
• Music you want to keep: FLAC to archive, MP3 or M4A to listen.
• Speech and podcasts: Opus, which is far smaller at the same clarity.

Questions

How many conversions are there?

Every pairing between the formats this site can read and the formats it can write, which comes to 975 of them across images, video and audio, plus pulling audio and still frames out of video.

Do I have to pick from this list?

No. The list exists so that each conversion has a page explaining that particular one. You can also open any tool and choose your source and target there.

Are any of these conversions paid or limited?

None of them. There is no account, no watermark, no daily cap and no file size limit, because your own machine does the work rather than a server somebody has to pay for.

Which conversions lose quality?

Any conversion whose target is a lossy format re-encodes the picture or sound, so a little is discarded. Each conversion page says plainly whether that applies and how much control you have over it.