Compress Video Online — Shrink MP4 Files for Free

What is the Compress Video tool?

Modern phones record beautifully sharp video — and produce enormous files. A single minute of 4K footage can weigh 300–400 MB, which is a problem when you need to send it over WhatsApp, attach it to an email, upload it on a slow connection, or free up storage. This free tool re-encodes your video with modern H.264 compression at a quality level you choose, discarding data your eyes barely notice so the file shrinks dramatically while still looking good.

All the work is done by FFmpeg, the industry-standard video toolkit, running inside your browser. There is no server, no upload queue and no account — your video never leaves your device, which also means you can compress personal recordings without worrying about privacy. The output is always an MP4, the most compatible video format on the planet.

How to use it (3 steps)

1. Upload your video. Drag an MP4, MOV, WebM or MKV file onto the drop zone, or click it to browse your device. The file stays on your device.
2. Pick a quality preset. High quality trims the file while keeping near-original sharpness; Balanced cuts much deeper for easy sharing; Smallest squeezes it down to the minimum for tight upload limits.
3. Compress and download. Hit the button — the video engine loads once on the first click (~30 MB), then the compression runs. When it finishes, the shrunken MP4 downloads automatically.

When you'll need it (use cases)

• Messaging apps: WhatsApp, Telegram and Messenger choke on large videos or butcher their quality on upload — compress first and send a file that arrives quickly and looks the way you intended.
• Email and forms: most inboxes and online forms cap attachments at 10–25 MB per file.
• Slow uploads: cut a 200 MB clip to 20 MB and it uploads ten times faster — a lifesaver on mobile data or hotel Wi-Fi.
• Freeing phone storage: keep a compressed copy of a video you want to save but don't need at full camera resolution.
• Web and social uploads: smaller files upload faster to YouTube, Facebook, school portals and marketplaces.

Tips for the best results

• Start with Balanced. For most sharing it is the sweet spot — typically 60–85% smaller with quality that still looks crisp on a phone screen.
• Smallest is for tight limits. Choose it when a form or chat app refuses anything over a few megabytes; expect visibly softer detail.
• Don't compress twice. Re-compressing an already-compressed video stacks artefacts. Always work from the highest-quality original.
• Keep the tab open. Re-encoding is heavy work; if the browser tab goes to sleep or closes, the job stops. Plug in your phone and keep the tab in the foreground.
• If the result barely shrinks, the original was probably already efficiently encoded — pick a lower preset rather than running it again.