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Video konvertieren

MP4, WebM, MOV, MKV

Drop a video here
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Max. Dateigröße: 500 MB

Über dieses Tool

Convert videos between formats - MP4, WebM, MOV, MKV, AVI and more - with control over the video and audio codec, the container and the target bitrate. Great for hitting upload requirements (Instagram wants MP4/H.264, archival often wants MKV), shrinking files, or making something playable on an old phone.

Conversion runs in your browser via FFmpeg-WebAssembly. Your source video is never uploaded, which matters for raw camera footage, client work, or anything you'd rather not hand to a random web service.

Funktionen

  • Output containers: MP4, WebM, MOV, MKV, AVI
  • Video codecs: H.264, H.265 / HEVC, VP9, AV1
  • Audio codecs: AAC, Opus, MP3
  • Quality (CRF) or bitrate-based encoding
  • Resolution and frame-rate overrides
  • 100% browser-side - files never leave your device
  • Free, no signup, no watermark

So funktioniert's

  1. Drop in your video file.
  2. Pick the target container, video codec and audio codec.
  3. (Optional) set CRF / bitrate, resolution and frame rate.
  4. Click Convert. Conversion runs locally - large files take a few minutes.
  5. Download the converted file.
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Alles passiert direkt in deinem Browser mit JavaScript und WebAssembly. Deine Dateien werden nie hochgeladen, nie gespeichert und nie von uns gesehen.

Häufig gestellte Fragen

Why is browser conversion slow?

FFmpeg-WebAssembly runs single-threaded inside one browser tab, so it's slower than native FFmpeg on the same machine. A 10-minute 1080p clip can take 5-15 minutes depending on your CPU. The trade-off is privacy - your file never leaves your device.

Which codec should I use for the web?

H.264 in MP4 is the safest universal choice. H.265/HEVC and AV1 give better quality at the same bitrate but have less consistent browser support.

What does CRF mean?

Constant Rate Factor - a quality setting where lower numbers mean higher quality and bigger files. 18 is visually lossless, 23 is the default, 28 is 'okay for web'.

Will my audio be re-encoded?

Yes - the audio codec is whatever you pick. If you want to keep the original audio bytes, the trim tool's stream-copy mode does that for trimming; full conversion always re-encodes.