Video Compressor Online – Free & Private

Reduce video file size in your browser. No upload. No signup. Powered by FFmpeg.

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Features

🔒

100% Private

All compression happens in your browser using FFmpeg.wasm. Your videos are never uploaded to any server.

⚡

One-Click Presets

Choose from Max, Balanced, or Light compression presets — no technical knowledge required.

🎛️

Advanced Controls

Fine-tune resolution, CRF quality, frame rate, codec, audio bitrate, and trim settings.

📊

Before / After Preview

Side-by-side video comparison with synchronized playback so you can judge quality before downloading.

🌐

Wide Format Support

Supports MP4, MOV, WebM, MKV, AVI and other common video formats.

🌙

Dark Mode & Mobile Ready

Clean, responsive interface that works beautifully on desktop and mobile — including dark mode.

How to Use

1

Upload your video

Click the upload area, drag and drop your video file, or paste it with Ctrl+V.

2

Choose a preset

Pick Max, Balanced, or Light compression. Each card shows the estimated output size.

3

Start compression

Click 'Start Compression' and watch the real-time progress bar. Cancel anytime.

4

Preview and download

Compare original vs compressed side-by-side, then download your smaller video.

Frequently Asked Questions

Is this video compressor free?
Yes, completely free with no usage limits or sign-up required.
Are my videos uploaded to a server?
No. All processing uses FFmpeg.wasm running entirely in your browser. Your video files never leave your device.
What video formats are supported?
MP4, MOV, WebM, MKV, AVI, and most other common video formats are supported.
What is CRF and how does it affect quality?
CRF (Constant Rate Factor) controls the quality-to-size trade-off. Lower values (e.g. 18) give better quality but larger files; higher values (e.g. 28) produce smaller files with more compression. The Balanced preset uses CRF 23, which is a good default.
Why is the first compression slow?
The first time you use the tool, the browser downloads the ~30 MB FFmpeg WebAssembly engine. Subsequent compressions in the same session are faster.

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