Video converter
Change video format or codec with FFmpeg in your browser.
Drop a video here or choose from your device
MP4, MOV, WebM, MKV, AVI, or M4V. Processing stays on this device.
A practical guide to Video converter
Video Converter changes a video's container and offered video codec with browser-based FFmpeg. Audio encoding is selected automatically for the chosen format, and the source resolution is retained.
Example: make a screen recording play on older devices
Export MP4 with H.264 video and AAC audio, retain the original frame rate, and test the complete file on the target phone.
Task-specific steps
- 1
Add the video and note its dimensions, duration, frame rate, rotation, and current audio before conversion.
- 2
Choose a target format and one of the video codecs offered for that format; audio encoding is assigned automatically.
- 3
Encode the result, inspect motion and sound near the start and end, and test it in the actual destination app.
Options that affect the result
- Format choices are MP4, WebM, MOV, MKV, and GIF, with compatible video-codec choices shown for the selected format.
- The converter retains source dimensions and uses AAC for MP4, MOV, or MKV, Opus for WebM, and no audio for GIF.
Limitations to know first
- Browser encoding is compute-intensive and can be slower than desktop hardware acceleration for long or high-resolution clips.
- Unsupported source codecs, subtitles, chapters, HDR metadata, or multiple audio tracks may not transfer completely.
Questions specific to this task
Is MP4 a codec?
No. MP4 is a container. It commonly holds H.264 or H.265 video with AAC audio, but the codecs must also be supported by the player.
Why did conversion make the file larger?
The selected video codec and the converter's format-specific encoding defaults may spend more data than an already efficient source file.