How it works
ffmpeg.wasm or similar decodes media in WebAssembly workers, encodes output, and hands you a Blob URL for download.
How to use Video Compressor
- Choose a video or audio file within stated size limits.
- Wait for WASM modules to finish loading if a progress bar appears.
- Adjust trim, quality, or encode options before starting.
- Download the output file created in memory — nothing is stored on our servers.
Worked examples
Concrete numbers and cases you can check against the tool above.
Quick check
Use a 30-second clip first to validate quality before processing a long file.
When to use Video Compressor
Cloud transcoders queue and privacy-policy your footage; local compression keeps drafts private.
Common use cases
- Compress demo reels under 25 MB email caps.
- Reduce 4K screen recordings to 1080p client updates.
- Preview quality steps before batch exporting.
Inputs and outputs
- MP4 and common video containers
- MP3 or compressed audio output
Privacy
This tool runs entirely in your browser. Processing uses local WebAssembly (WASM) where needed — your files and data never leave your device.
Frequently asked questions
- Why is encoding slow?
- WASM lacks GPU acceleration on many browsers; shorter clips encode faster.
- Is my video uploaded?
- No. Bytes stay in memory on your device during processing.
- What file size works?
- Large files may exceed mobile RAM; try trimming first or use desktop Chrome.