Video Compressor
Shrink any video file size right in your browser — pick a quality preset, compress, and download. Nothing is ever uploaded.
About the Video Compressor
A big video file is annoying to send over WhatsApp, slow to upload, and eats into limited mobile data or cloud storage. Our Video Compressor re-encodes your video using ffmpeg.wasm — the same battle-tested FFmpeg engine that powers most professional video tools — compiled to WebAssembly so it runs directly inside your browser.
Because everything happens client-side, there's no upload wait, no file-size cap tied to a server, and no privacy concern about a video sitting on someone else's storage. Pick a preset that trades size for quality — Light keeps quality nearly untouched with a modest size cut, Balanced is the sensible everyday default, and Maximum squeezes the file down hard for slow connections or storage-constrained devices. If you're also cropping to a specific aspect ratio for Reels or Shorts, try our Reel & Shorts Size Resizer first, then compress the result here.
Related reading: How to reduce video file size without losing quality · What is video bitrate?
Use it in 3 steps
No upload wait · No account · No app install.
Choose your video
Drop in any MP4, MOV, WebM or MKV file from your device — up to a few hundred MB works comfortably in most browsers.
Pick a compression level
Choose Light, Balanced or Maximum compression depending on how much size you need to save vs. how much quality you want to keep.
Download the smaller file
Your browser re-encodes the video locally and hands you a compressed MP4 you can save or share immediately.
Frequently Asked Questions
Everything people ask before they download.
Does this upload my video to a server?
No. The compression runs with ffmpeg.wasm entirely inside your browser tab using WebAssembly. Your video file never leaves your device.
How much smaller will my file get?
It depends heavily on the source video — how it was originally encoded, its resolution and bitrate. Balanced compression typically cuts file size noticeably while keeping the video watchable; Maximum compression saves more space at a visible quality cost.
Why is it slow on my phone?
Client-side encoding is CPU-bound, and phones have less power than a desktop. Longer or higher-resolution videos will take longer — keep the tab open and don't switch apps while it runs.
What file size limit does this have?
There's no hard limit we impose, but browsers running WebAssembly have memory ceilings. Very large files (over roughly 500MB–1GB depending on your device) may fail or run out of memory — try trimming the clip first with our Video Trimmer if that happens.
Will audio quality be affected?
Audio is preserved as-is at a reasonable bitrate; only the video stream is re-encoded to reduce size.
Can I compress a video before uploading it to Instagram or WhatsApp?
Yes — this is one of the most common uses. Compress first here, then upload the smaller file to save data and avoid platform re-compression artifacts.