Will converting reduce video quality?

Not when the stream is copied (MOV/MKV to MP4 with H.264). Re-encoding (WebM, AVI, compression) is lossy but visually transparent at the High setting.

How large a video can I convert?

Multi-gigabyte files work in a desktop browser because they are streamed rather than loaded into memory. Phones manage about 1–2 GB.

Which conversions use the server?

AVI, WMV and other formats browsers cannot decode, plus HEVC files on browsers without HEVC support. The page tells you beforehand.

Converters

Video Converters

MOV, MP4, WebM, MKV and GIF — convert and compress video. · 9 tools

iPhone MOVs, MKV downloads, WebM screen recordings and old AVIs all need to become MP4 sooner or later. Where the video inside is already H.264, these tools simply re-wrap it — seconds, no quality loss. Where it is not, the browser’s hardware encoder does the conversion on your device.

Legacy formats (AVI, WMV, DivX) cannot be decoded by browsers, so those conversions run on our server and are deleted within an hour. GIF creation, compression and format changes for modern files stay on your device.

To MP4

From MP4

MP4 to WebMOn-deviceMP4 to smaller WebM (VP9/Opus) for websites.MP4 to GIFPopularOn-deviceVideo clip to an animated GIF with trim and size controls.GIF to MP4On-deviceAnimated GIF to a much smaller MP4 video.

Edit & optimise

Compress VideoPopularMake a video small enough for email, WhatsApp or uploads.Video ConverterAny video format to any other, with codec options.

How to choose

Sharing and uploading: MP4 with H.264 video is the safe answer for every platform. Use Compress Video to hit an attachment limit.
Short clips for chat: MP4 to GIF makes an autoplaying loop; GIF to MP4 does the reverse and shrinks big GIFs 5–10×.
Your own website: WebM (VP9) is 20–40 % smaller than MP4 and plays in all browsers; serve it with an MP4 fallback.

Video Converters

To MP4

From MP4

Edit & optimise

How to choose

Frequently asked questions