Video and audio tools that never upload your files
Most online video converters make you upload the whole file, wait in a queue, and then download it again. That is slow for a 500 MB phone video and risky for private recordings. Every tool on this page works differently: it uses your browser's built-in media engine (WebCodecs) to decode and encode the file on your own device. Nothing is sent to a server, there is no file count limit, and there is no watermark.
Pick the job you need:
- Compress a video to a quality level or an exact size in MB, for WhatsApp, email or a 25 MB upload limit.
- Convert video from MOV, MKV or WebM to MP4 so it plays everywhere, without re-encoding when the streams allow it.
- Trim a video to cut the start and end, or turn a clip into a GIF.
- Extract the audio from a video as MP3, M4A or WAV.
- Convert audio between MP3, WAV, OGG, M4A and FLAC, or cut an audio file on a waveform.
- Record your voice or record your screen with no install.
Tips for smaller, better files
- Trim first, then compress. Every second you cut is data the compressor never has to keep.
- Lower the resolution before the quality. Going from 1080p to 720p removes more than half the pixels, and on a phone screen the difference is hard to see.
- Use MP4 with H.264 when in doubt. It plays on every phone, TV and app. WebM, VP9 and AV1 make smaller files but fewer apps support them.
- Keep the original until you have checked the result. Re-compressing a file that a messaging app already squeezed rarely makes it much smaller.
Which browsers work?
Recent versions of Chrome, Edge, Firefox and Safari include the media engine these tools need, on computers and on phones. Each tool checks for it and tells you if your browser is too old. Large files are held in your device's memory while they are processed, so a computer handles multi-gigabyte videos better than an older phone.