How to convert or compress video
Choose a file, select video mode, output format, quality and optionally a smaller resolution. Press Process locally and download the result. MP4 verkleinen and video comprimeren happen on your device.
Trim video, extract audio and create thumbnails
Enter start and end seconds to trim a clip. Select Extract audio for a sound file or Thumbnail for a still frame. Audio files can be converted, adjusted and normalized when the bundled codec and filter are available. Choose Merge audio tracks and upload 2–4 clips to join them in order.
Which formats work?
The selected FFmpeg WebAssembly build determines available codecs. Possible outputs include MP4, WebM, WAV, MP3, OGG, Opus and FLAC, but unavailable encoders are rejected rather than silently claimed supported. Large files can exhaust browser memory.
FAQ
Are uploads required?
No. The conversion works locally after the engine has been downloaded from GratisTools.
Is it free?
Yes, with no processing fees. Your device performs the work.
Why might a codec fail?
FFmpeg builds vary in available decoders, encoders, containers and patent licensing. Some files may be incompatible.
Open-source licenses and source code
This software uses code of FFmpeg licensed under GPLv2 or later. The browser engine is the unmodified @ffmpeg/core 0.12.10 build. See corresponding build source, upstream FFmpeg source, and the site license notices.
Frequently asked questions
Is this tool free?
Yes. The core tool is free to use in your browser.