Online Video Compressor
Compress MP4 and WebM videos with selectable resolution and quality. 100% private, all processing in your browser
Local Compression
Powered by ffmpeg.wasm, no upload
Privacy First
Your videos never leave your device
Flexible Options
Resolution, quality, format adjustable
Multi-Format
MP4 and WebM output
Click or drag files here
Batch upload supported
Start compressing your video
Click or drag a video to the area above, set options to start compressing
Frequently Asked Questions
Will video quality decrease after compression?
There will be some quality loss. Control quality via the CRF slider: lower values mean higher quality and larger files, higher values mean higher compression. Start from the default value.
Will my video be uploaded to a server?
No. All compression is done locally in your browser via ffmpeg.wasm. Your video data never leaves your device, ensuring complete privacy protection.
What video formats are supported?
Supports common video formats for upload (e.g. MP4, WebM, MOV), with output format selectable as MP4 (good compatibility) or WebM (smaller size).
Why is there a wait on first use?
The first use loads the ffmpeg.wasm processing engine into your browser. Once loaded, processing is local and subsequent uses are faster.
Are there file size limits?
Subject to browser memory and device performance, we recommend processing smaller video files. Very large videos may fail due to insufficient memory.
Is this tool free to use?
Completely free. This is a pure frontend online tool - no registration required, no payment needed, just open and use.