MP4 Compressor

Compress MP4 videos online for free. Reduce file size without losing quality. Fast, secure, and easy-to-use video compressor.

Upload MP4 Video

Drag & drop or click to upload

Supports .mp4 files

Compression Level

Medium (Balanced Quality)

Best balance of size and quality

High (Smaller Size)

Noticeable quality loss, smallest file

Low (Better Quality)

Visually lossless, larger file

Result Preview

Compressed video preview will appear here

Shrink MP4 File Size in Your Browser — No Uploads

This tool uses FFmpeg WebAssembly to re-encode your MP4 using the H.264 codec with a Constant Rate Factor setting you control. Choose Low compression for near-lossless quality, Medium for the best size-to-quality balance, or High for maximum size reduction. The entire process runs locally — your video is never transmitted to a server.

H.264 CRF compression — 3 presets

Why Use This Tool?

Three compression levels

Low keeps the video visually lossless for archiving, Medium balances size and quality for everyday sharing, and High produces the smallest file for email or mobile.

Fully private processing

FFmpeg runs as WebAssembly inside your tab. No video data is ever uploaded, ensuring your personal or client footage stays completely on your device.

See the savings instantly

After compression the tool shows original versus compressed file size and the percentage reduction so you know exactly how much space you saved.

Works on desktop and mobile

The tool runs in any modern browser on Windows, Mac, Android, and iOS — compress a large MP4 directly from your phone without installing an app.

How this MP4 Compressor works

Our MP4 Compressor reduces the size of your video files directly in your browser using advanced compression algorithms. By adjusting the Constant Rate Factor (CRF) of the H.264 video stream, it intelligently reduces visual data that the human eye is less likely to notice, resulting in significantly smaller files with minimal quality loss.

You can choose between three compression levels: "Low" for maximum quality retention, "Medium" for a balanced reduction suitable for sharing, and "High" for the smallest possible file size. The audio track is preserved in its original quality to ensure the listening experience remains unchanged.

This tool is ideal for shrinking videos for email attachments, social media upgrades, or saving storage space. Since all processing happens locally on your device, your videos remain private and secure, and there are no upload wait times.

Need to convert from MKV first? Use our MKV to MP4 Converter.

How to use this MP4 Compressor

Upload MP4

Select or drag your MP4 video into the box.

Choose Quality

Select Low, Medium, or High compression.

Compress

Click button to reduce file size instantly.

Example Usage

A 120 MB screen recording compressed at the High preset to 42 MB for easy email sharing with minimal visible quality loss.

Input

presentation.mp4 (120 MB, High compression / CRF 28)

Output

presentation-compressed.mp4 (~42 MB, ~65% smaller)

Frequently Asked Questions

How can I reduce MP4 file size without losing quality?

Our tool uses efficient compression (H.264/CRF) to reduce file size while maintaining excellent visual quality. Choose the "Medium" or "Low" compression preset for the best balance.

Is this MP4 video compressor free?

Yes, you can compress unlimited MP4 videos for free. There are no watermarks added to your videos and no hidden paywalls.

Is my video uploaded to a server for compression?

No. We use secure browser-based technology. Your video stays on your device throughout the entire compression process, guaranteeing complete privacy.

Which compression level should I choose?

Use "Medium" for a good balance of size and quality. Use "High" for maximum size reduction (good for sharing), or "Low" if preserving quality is your top priority.

Can I compress MP4 videos on mobile?

Yes, our tool works in modern mobile browsers on Android and iOS, allowing you to compress videos directly from your phone or tablet.

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The MP4 Compressor is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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