Video Compressor

Shrink video file sizes without quality loss. Reduce MP4, MOV, WebM and more — all processed right in your browser. No uploads, no waiting.

100% Free
No Upload Required
MP4 / WebM / MOV
Adjustable Quality

Drop your video here

or click to browse — MP4, MOV, WebM, AVI, MKV and more
MP4MOVWebMAVIMKVWMV+More
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Duration: --- Resolution: --- Size: ---
Note: Browser-based compression uses the MediaRecorder API (VP8/VP9 codec). For maximum compatibility, output is WebM format. Re-encoding quality depends on your browser and video content.
Compression Settings
Video Quality High (80%)
Smallest FileBest Quality
Compressing video... 0%
Initializing MediaRecorder...
Compression Complete!
Original Size
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Compressed Size
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Size Reduced
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How It Works

Compress your video in three simple steps.

1

Upload Your Video

Drag and drop or click to browse. Supports MP4, MOV, WebM, AVI, MKV and most common video formats.

2

Choose Settings

Pick output resolution, quality level, and target file size. Smart auto mode picks the best bitrate for your video.

3

Download Result

Compression runs in your browser using the MediaRecorder API. When done, download your smaller video instantly.

Everything You Need

A complete video compressor running entirely in your browser.

100% Private

Your video never leaves your device. All compression uses the browser's built-in MediaRecorder API — no server involved.

Adjustable Quality

Control compression from maximum quality to maximum size reduction with a simple slider. Preview the tradeoff instantly.

Resolution Downscale

Optionally reduce resolution to 1080p, 720p, 480p, or 360p. Lowering resolution dramatically reduces file size.

Size Stats

See original size, compressed size, and exactly how much space you saved — displayed clearly after compression completes.

Smart Bitrate

Auto mode calculates the optimal bitrate based on duration and target size, so you get the best quality for any file size goal.

Instant Download

Compressed video is ready to download as soon as processing finishes. No email, no account, no waiting in a queue.

Frequently Asked Questions

What format is the output video?
The compressed output is WebM format using VP9 or VP8 codec, depending on your browser. WebM is supported by Chrome, Firefox, Edge, and Android. For iOS/Safari playback you may need to convert to MP4 after downloading.
Is my video uploaded to a server?
No. Compression runs entirely in your browser using the HTML5 MediaRecorder API. Your video file never leaves your device at any point.
How much can I reduce the file size?
It depends on the source video and settings. Lowering resolution to 720p or 480p combined with reduced quality can cut file size by 50–80%. Videos that are already heavily compressed will see less reduction.
Why does compression take time?
The browser re-encodes the entire video in real time using your CPU. A 10-minute video might take 2–5 minutes depending on your device speed and chosen settings. Desktop computers are generally faster than mobile.
Does it work on mobile?
Yes, on Android with Chrome or Firefox. iOS Safari has limited MediaRecorder support so results may vary on iPhones. For best results use a desktop or Android device.
What is the maximum file size I can compress?
There is no hard file size limit — it depends on your browser's available memory. Most modern browsers handle videos up to 2–4 GB comfortably. Very large files may cause slow performance on low-RAM devices.

Free Online Video Compressor — Reduce Video Size in Your Browser

Our online video compressor lets you shrink any video file without uploading it anywhere. Using the HTML5 MediaRecorder API and Canvas API, compression runs entirely client-side — giving you full privacy and instant results.

How Browser-Based Video Compression Works

The tool plays your video through a hidden HTML5 video element, draws each frame onto a Canvas, and feeds the canvas stream into a MediaRecorder set to your chosen bitrate. The resulting Blob is collected in chunks and assembled into a downloadable WebM file. Resolution downscaling is handled by resizing the canvas before recording begins.

When to Compress a Video

Common reasons to compress video include reducing file size for email attachments, uploading to social media platforms with file size limits, saving storage space on your device, sharing over messaging apps, and preparing videos for web embedding where load speed matters. Lowering resolution to 720p or 480p is often the single most effective way to reduce file size while keeping the video watchable.

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