Free Online Video Compressor — Compress MP4, WebM & MOV

Compress MP4, WebM, MOV, OGG and MKV videos directly in your browser — no upload, no registration, completely free. Adjust bitrate, resolution scale and output format to find the perfect balance between file size and video quality. All processing happens entirely on your device — your videos never leave your browser.

Multiple formats

Wide format support

Upload MP4, WebM, MOV, OGG, or MKV videos and compress them directly in your browser.

Privacy-first

On-device processing

Videos never leave your browser. All compression happens locally, ensuring complete privacy.

Quality control

Adjustable settings

Control bitrate, resolution scale and output format to get the exact file size you need.

Upload Your Video

Click to browse or drag and drop your video here

Supports: MP4, WebM, MOV, OGG, MKV (Max 500MB)

Choose or Drop Video

Quality Preset

Video Bitrate (kbps)

kbps

Resolution Scale

Output Format

Original size —

Compressed size —

Duration —

Size reduction —

Original

Compressed

Upload your video (up to 500 MB)
Choose a quality preset or set a custom bitrate
Scale the resolution to reduce file size further
Pick the output format that suits your target device
Click Apply & Re-compress or download immediately
Everything runs in your browser — fully private

MP4 — H.264, H.265 (all browsers)
WebM — VP8, VP9 (Chrome, Firefox, Edge)
MOV — QuickTime (Safari, Chrome)
OGG — Theora (Firefox, Chrome)
MKV — depends on browser codec support

Use WebM/VP9 for the smallest file size
Use MP4 for best device compatibility
Lowering resolution has the biggest impact on size
Long videos take more time to process — be patient
Compression quality depends on your browser's codec support

Frequently Asked Questions

Is my video uploaded to a server?

No. All compression happens locally in your browser using Web APIs (Canvas and MediaRecorder). Your video never leaves your device.

What video formats can I upload?

You can upload MP4, WebM, MOV, OGG, and MKV files. Playback depends on your browser's built-in codec support. MP4/H.264 works in all modern browsers.

What output formats are available?

The tool outputs WebM (VP9 or VP8) or MP4. WebM offers the best compression ratios. MP4 output requires a browser that supports it via the MediaRecorder API (e.g. Safari 14.1+, some Chrome versions).

Why does compression take a long time?

The browser needs to re-encode every frame of your video in real time using JavaScript. This is slower than native software encoders like FFmpeg. Longer or higher-resolution videos will take proportionally more time.

Is there a file size limit?

The tool accepts files up to 500 MB. Very large files may cause performance issues depending on your device's available memory.