Video Compressor

Drop a video file and get a smaller MP4 back in under two minutes. The compression runs inside your browser using FFmpeg.wasm, so your footage never touches a server.

Drop your video here or browse

MP4, MOV, AVI, WebM, MKV — no size limit (processed in browser)

FreeNo Cost

LocalBrowser

No LimitFile Size

How It Works

Upload your video
Choose quality and resolution
Download compressed file

Tips for Best Results

720p + Medium = great balance
480p for maximum compression
High quality for archiving

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Video Effects

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Video to Audio

Extract audio from any video file

Why Use Video Compressor

Aggressive File Size Reduction

H.264 re-encoding with a tunable CRF value shrinks most videos by 50 to 90 percent. A 300MB recording can drop below 50MB at 720p Medium without obvious visual loss.

Stays on Your Device

FFmpeg.wasm runs the encode job directly in your browser tab. No file is transmitted to any server unless you choose to save the result to your gallery.

Resolution and Quality Presets

Set output resolution from 480p up to the original, and choose Low, Medium or High quality. Lower CRF values keep more detail; higher ones cut the file size further. Pick the trade-off that matches your use case.

No Server Upload Ceiling

Because encoding happens inside your browser, there is no server-imposed file size cap. Very large files will use more RAM and time, so closing other tabs helps on memory-limited devices.

Perfect For

Content Creators Social Media Web Developers Educators Mobile Users Email Attachments

Powered by FFmpeg.wasm

FFmpeg.wasm — Full FFmpeg Engine in Your Browser Tab

FFmpeg.wasm is a WebAssembly port of the same FFmpeg binary that video professionals run on the command line. Compiled to wasm, it loads directly into your browser and encodes video frames using your CPU, not a remote server. The first load fetches the wasm binary; after that it runs instantly from cache.

The compressor uses the libx264 encoder with a CRF (Constant Rate Factor) setting mapped to your chosen quality preset. A higher CRF produces a smaller file with slightly lower detail; a lower CRF keeps more quality at the cost of file size. Resolution downscaling is applied before encoding, which compounds the size savings for large source files.

Frequently Asked Questions

When you drop a file, FFmpeg.wasm loads into a browser worker thread and re-encodes the video using the H.264 (libx264) codec at the CRF value mapped to your quality preset. Resolution is scaled down if you chose a smaller output size. The result is a standard MP4 with AAC audio. Nothing is sent to a server during this process.

There is no server-side upload cap because the file never leaves your machine. The practical ceiling is your device's available RAM. A 1GB video will compress fine on a modern desktop; on a phone with 3GB RAM and other apps open, you may hit memory limits with very large files. Closing other browser tabs frees up headroom for the wasm encoder.

It depends heavily on how the source was encoded. A 300MB screen recording shot at high bitrate can compress to under 50MB at 720p Medium. A 300MB file that was already encoded efficiently will shrink less. Dropping from 1080p to 480p combined with the Low quality preset gives the most aggressive reductions, typically 80 percent or more.

No. FFmpeg.wasm encodes video inside a browser worker, reading directly from your local file system API. Your footage is never transmitted. The one exception is the optional "Save to Gallery" button: clicking it sends the finished compressed file to your account for later download. Skipping that step means nothing leaves your device.

A 1-minute 1080p video typically finishes in 30 to 90 seconds on a mid-range laptop. Compression speed scales with source resolution and length, not file size alone. A 10-minute 480p clip may be faster than a 2-minute 4K clip. The progress bar updates in real time so you can see exactly how far along the encode is.

The output is always an MP4 file with H.264 video and AAC audio. That combination plays natively on every major platform, browser and mobile OS. It meets the upload requirements for YouTube, Instagram, TikTok, WhatsApp and most email clients that accept video attachments.

Yes. The tool re-encodes the video you provide and hands back a smaller file. It adds no watermarks and imposes no licensing restrictions on the output. Your original rights over the footage are unchanged.

Free Video Compressor: Reduce Video File Size in Browser vs Other Methods

Feature	Luxoret AI	Manual / Traditional	Other Tools
Speed	Minutes, not hours	Hours of manual editing	Varies by complexity
Skill Required	None — AI handles it	Video editing expertise	Moderate learning curve
Software	Browser-based, nothing to install	Expensive editing suite	Desktop app required
Quality	AI-enhanced, professional	Depends on editor skill	Template-dependent
Revisions	Instant re-processing	Re-edit from scratch	Limited by plan