Video Converter
Convert video between MP4, WebM, MOV and MKV with control over encoding quality and resolution. Container and codec choices are the usual reason a file will not play somewhere, and converting is generally faster and more reliable than hunting for a player that will accept the original. It is free, needs no account, and adds no watermark to your result.
Video Converter
Add your files. Recommended settings are ready, so you can process in one click.
PDF, Word, images, audio, video, archives and more
Up to 100 files · 250 MB · No account- 1Add files
- 2Choose an action
- 3Download or keep going
What people use it for.
What happens to your file.
FFmpeg transcodes the video and audio streams into the target container, using H.264 for MP4 and MOV and VP9 for WebM, with the quality level and output resolution you select. Audio is re-encoded to a codec the destination container supports. The picture always comes out as 8-bit 4:2:0 at an even size, which is what phones, browsers and TVs decode: an HDR clip from a phone is tone-mapped to standard range, and a video filmed upright stays upright. Every audio track is kept, so a film with two languages keeps both. Text subtitles go into MP4 and MOV as their own subtitle track, and MKV keeps every subtitle track. FLV and 3GP hold one sound track, so they take the first; MPEG takes stereo sound at a standard frame rate.
Where it stops: Transcoding re-encodes the picture, so each conversion loses a little quality; convert from the original rather than from a previous conversion. Long or high-resolution videos take real processing time, and the fair-use ceiling is 250 MB per job.
Which format should you choose?
| Format | Video and audio | Best for |
|---|---|---|
| MP4 | H.264 and AAC | Almost everything: phones, browsers, editors and upload sites |
| MOV | H.264 and AAC | Apple apps and editing software |
| MKV | H.264 and AAC | Media players and home servers |
| WebM | VP9 and Opus | Your own web pages; smaller at the same quality |
| AVI | H.264 and AAC | Software that insists on AVI |
| MPEG | MPEG-2 and MP2 | Older DVD-era players and software |
| FLV | Flash video and MP3 | Legacy systems that still expect FLV |
| TS | H.264 and AAC | Broadcast and streaming workflows |
| 3GP | H.264 baseline and AAC | Very old phones |
Quality and speed
- Quality (CRF) runs from 15 to 40, and lower means better quality and a larger file. 24 is the default and suits most footage.
- The encoder preset trades time for size in MP4, MOV, MKV and AVI: slow gives a smaller file at the same quality, ultrafast finishes sooner.
- MPEG and FLV use a fixed quality level, so the CRF setting does not change them.
Everything you need, without a paywall.
Common questions.
Which format has the widest compatibility?
MP4 with H.264 video and AAC audio plays on essentially everything: phones, browsers, smart TVs and editing software. Choose it unless you have a specific reason not to.
MP4 or WebM for a website?
WebM with VP9 gives smaller files at the same quality and is supported by all current browsers. MP4 remains the safer choice if you need to support older devices.
Will converting reduce the quality?
Slightly, because the video is re-encoded. Selecting a higher quality level keeps the loss invisible at the cost of a larger file.
Will an iPhone video play on Windows or Android after converting?
Yes. iPhones record HEVC, often in HDR, which many Windows PCs, older Android phones and browsers cannot play. Converting to MP4 gives H.264 in standard range, and a video filmed upright stays upright.
Are subtitles and audio languages kept?
Yes, where the format can hold them. Every audio track goes across. MP4 and MOV keep text subtitles such as SRT, and MKV keeps every subtitle track. Picture-based subtitles from film rips (PGS, VobSub) cannot go into MP4, so convert to MKV to keep them.
You might also need.
Reduce video file size using H.264 compression with CRF quality control, optional resizing and web-optimized MP4 output.
Resize video to custom dimensions or common 1080p, 720p, vertical and square presets while preserving aspect ratio.
Extract the audio track from a video and save it as MP3, WAV, M4A or FLAC.
Inspect video codec, audio codec, resolution, frame rate, duration, bitrate, streams and container metadata using ffprobe.