Video Converter
Upload a video and convert it to any format — processed entirely in your browser.
Output Format
All processing happens in your browser — your files are never uploaded.
How to use Video Converter
The Video Converter re-encodes or remuxes MP4, MKV, WebM, MOV and AVI videos into your chosen output format using H.264, H.265, VP9 or AV1 codecs — entirely in your browser via FFmpeg WebAssembly with no server uploads. Convert a MOV from your iPhone for web playback, turn an AVI into a modern MP4, or prepare footage for a specific platform or editing application.
- Click "Select Video" and open the source video file.
- Choose the output container format (MP4, WebM, MKV or MOV).
- Select the video codec (H.264 for compatibility, H.265 or VP9 for better compression, AV1 for cutting-edge efficiency).
- Set the quality level (CRF) and optionally choose an audio codec and bit rate.
- Click Convert and download the output video once processing completes.
Your data never leaves your device — 100% private processing.
Choosing a codec and container
The container (MP4, MKV, WebM) is the wrapper file format; the codec (H.264, H.265, VP9, AV1) defines how the video data is compressed. Not all codecs work in every container — MP4 works with H.264 and H.265 but not VP9; WebM works with VP8, VP9 and AV1. H.264 in an MP4 container is the safest choice for maximum compatibility across devices, browsers and platforms. H.265 halves the bitrate at the same quality but requires hardware decoding support. VP9 and AV1 are royalty-free alternatives used on YouTube and streaming services.
| Codec | Container | Compatibility |
|---|---|---|
| H.264 | MP4, MKV, MOV | Universal |
| H.265 (HEVC) | MP4, MKV | Modern devices / browsers |
| VP9 | WebM, MKV | Chrome, Firefox, YouTube |
| AV1 | WebM, MKV, MP4 | Latest browsers, Android |
Remuxing vs transcoding
Remuxing moves streams from one container to another without re-encoding — for example, changing an MKV with H.264 video into an MP4 with the same H.264 stream. It is instantaneous and lossless because no data is changed. Transcoding re-encodes the video with a new codec or quality setting and is much slower. If your source codec is already compatible with the target container, choose remux to save time and avoid quality loss. Transcoding is only necessary when changing codecs, resolution, quality or removing unsupported metadata.
Glossary
- Container format
- A file format (MP4, MKV, WebM) that packages one or more audio, video and subtitle streams into a single file.
- Remux
- Changing the container format of a media file without re-encoding the audio or video streams, preserving full quality.
- Transcode
- Decoding a media stream and re-encoding it with a different codec or settings, which is slower and introduces generation loss.
- AV1
- An open, royalty-free video codec developed by the Alliance for Open Media; offers better compression than VP9 and H.265.
- VP9
- An open-source video codec from Google used extensively on YouTube and in WebM containers; competitive with H.265 in compression efficiency.
Related reading
Frequently Asked Questions
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Why use Video Converter?
- Powered by FFmpeg running directly in the browser — no upload needed
- Supports all major video and audio formats
- Lossless and lossy options for quality control
- Export results immediately without waiting for cloud processing
Common use cases
- Compress a video before uploading to Google Drive
- Extract audio from a video lecture for easy listening
- Trim a video clip for a social media reel
- Convert MOV files to MP4 for cross-platform compatibility
- Merge two audio tracks for a podcast episode
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