Video Converter

Yes. There is no sign-up, watermark or upload. The page loads FFmpeg as WebAssembly from a public CDN, then your video is read into browser memory and encoded on your own processor. The converted file is created in the tab and downloaded directly to your device.

Drop the MOV file, choose MP4 under Convert to and press Convert. Most iPhone MOV files already contain H.264 or HEVC video. If yours is H.264, tick Copy streams to switch the container in seconds; HEVC needs re-encoding to H.264 for the widest compatibility, which is the default.

CRF (constant rate factor) sets quality instead of a fixed bitrate: lower numbers mean better quality and bigger files. For H.264, 18–20 is visually near-lossless, 23 is the default and 28 is noticeably smaller. VP9 uses a different scale, where around 31–33 is a sensible default.

The WebAssembly build of FFmpeg used here runs on a single CPU thread without hardware encoders, so it is slower than desktop software. Short or downscaled clips finish quickly; a long 1080p video can take several times its own length. Lower the resolution, use Faster encode, trim, or use Copy streams when possible.

There is no fixed limit, but the whole file and the output must fit in browser memory. Files up to a few hundred megabytes usually work on a desktop; above about 1.5 GB conversions typically fail. Phones have less memory, so keep clips shorter there.

MP4 with H.264 plays on virtually every device, app and social network, so it's the safe default. WebM with VP9 is often smaller at the same quality and is well supported in modern browsers, which makes it a good choice for embedding on web pages. VP8 WebM is for older players.

Yes. Choose GIF, then set the frame rate (5–25 fps), width (240–800 px or original) and loop. The converter builds a 256-colour palette from the clip and applies it with ordered dithering. GIFs are large, so keep them short — a few seconds at 480 px is ideal.

Choose MP3, M4A or WAV under Convert to. The first audio track is copied out and encoded — MP3 and M4A at 192 kbps, WAV as 16-bit PCM — while the video stream is skipped, so it's quick. If the file has no audio track you'll get a clear message.

It rewrites the existing video and audio into a new container without decoding them, so it's very fast and lossless. It only works when the target container supports the codecs — H.264 and AAC fit MP4, MOV and MKV, while WebM needs VP8, VP9 or AV1. Trims snap to the nearest keyframe.

Yes. Re-encoding to MP4 at a lower resolution such as 720p or 480p and a higher CRF (for example 26–28) usually shrinks files dramatically. After each conversion the result shows its size and the percentage change compared with the original.