Compress Video Online

Reduce video file size while maintaining quality. Supports MP4, MOV, AVI, MKV, and WebM formats.

Drag and drop your videos here

Max file size 500MB. Free, no registration required.

How to Use

1

Upload your video by clicking the upload area or drag and drop

2

Adjust the compression slider — move right for smaller files, left for higher quality

3

Click 'Compress Video' to start the compression process

4

Download your compressed video once processing is complete

Why choose our converter?

Quality, speed, and security for all your conversions.

High-quality conversion

Precise file conversion without any loss of quality.

100% browser-based

Files never leave your device. All processing happens locally.

Works on all devices

Computer, tablet, or smartphone — any browser works.

Fast processing

Convert files in seconds with our optimized engine.

No registration

Start converting immediately. No sign-up needed.

Batch conversion

Convert multiple files at once to save time.

About This Tool

This free online video compressor reduces video file sizes using H.264 encoding with adjustable CRF (Constant Rate Factor) settings. Lower CRF values produce higher quality but larger files, while higher values create smaller files with more compression. The tool supports MP4, MOV, AVI, MKV, and WebM input formats and outputs optimized MP4 files. All processing happens locally in your browser using ffmpeg.wasm — your videos are never uploaded to any server, ensuring complete privacy. Perfect for reducing video sizes for sharing via email, messaging apps, or social media.

Frequently Asked Questions

Which video formats can I compress?
You can compress MP4, MOV, AVI, MKV, and WebM videos. The output is always an optimized MP4 file using H.264 encoding, which offers the best compatibility across devices and platforms.
What does the CRF slider do?
CRF (Constant Rate Factor) controls the trade-off between video quality and file size. A CRF of 18 produces high quality with moderate compression, 23 is a good balance, 28 gives noticeably smaller files, and 33 provides maximum compression. The default is 28 for a good balance of size reduction and quality.
How much can I reduce my video file size?
Typical compression reduces file size by 30-70% depending on the original video and CRF setting. Videos that were previously uncompressed or lightly compressed will see the largest reductions. Already heavily compressed videos may see smaller gains.
Is my video data secure?
Yes! All compression happens directly in your browser using ffmpeg.wasm. Your video files are never uploaded to any server. They stay on your device the entire time, ensuring complete privacy.
Why is compression slow for large files?
Video compression is computationally intensive. Since processing happens entirely in your browser using WebAssembly, it may be slower than native desktop applications. For best performance, use a modern browser on a desktop computer. Files under 200MB typically compress within a few minutes.

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