Rewrap · seconds
When the new format can hold the original codecs (H.264 MP4 → MOV, anything → MKV), nothing is re-compressed and no quality is lost.
Video format converter
Convert to MP4, MOV, AVI, MKV, WebM, GIF or MP3. It runs inside this browser, so your file is never uploaded anywhere.
- No install or sign-up
- No upload
- No watermark
Three steps
- Choose a file
- Choose a format
- Download
Quality kept, re-encoded only when needed
Re-encode
When the codecs differ, as for AVI, WebM or GIF, it re-encodes at high quality. Long videos take a while.
Which format should you convert to?
Does MOV to MP4 lose quality?
MOV files from iPhones and cameras usually hold H.264 or HEVC video with AAC sound, which MP4 can hold too. Then the file is only rewrapped, without re-compression: it takes seconds and the quality stays the same. HEVC video may not play on devices without HEVC support.
What each format is for
MP4 plays on the web, social apps and messengers. MOV suits Mac and Final Cut Pro, MKV keeps subtitles and several audio tracks, WebM embeds in web pages, and AVI works with older devices and programs.
Keep GIFs short and small
GIFs have no sound and only 256 colours, so they grow large quickly. Videos up to 60 seconds become a 12 fps GIF at most 480 px wide. For a sharper loop, a short MP4 wins on both quality and size.
When re-encoding is needed
Formats that cannot hold the original codecs, such as WebM or AVI, need the video compressed again. That runs in your browser, so long videos take time; for files of several GB the desktop app is faster and steadier.
FAQ
Are my files uploaded?
No. Everything happens in this browser. The conversion engine (about 30 MB) downloads once and is reused afterwards.
Can it handle large files?
It works in browser memory, so re-encoding files of several GB or long videos can be slow or fail. Use the desktop app for large videos.
How are GIFs made?
Videos up to 60 seconds become a 12 fps GIF at most 480 px wide.
Is it free?
Yes. No limits and no watermark.