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Convertir une vidéo

MP4, WebM, MOV, MKV

Drop a video here
ou cliquez pour parcourir - les fichiers restent sur votre appareil
Taille maximale: 500 MB

À propos de cet outil

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.

Fonctionnalités

  • 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

Comment l'utiliser

  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.
🔒 100 % privé

Tout se passe dans votre navigateur grâce à JavaScript et WebAssembly. Vos fichiers ne sont jamais téléversés, jamais stockés et jamais vus par nous.

Questions fréquentes

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.