Video Compressor
Video Compressor reduces MP4, MOV, AVI, and MKV file sizes using H.264 encoding, directly in your browser. Choose from three quality presets to balance visual clarity and output size. No file is uploaded to any server — your video never leaves your device.
Drag & drop your file here
or browse files from your device
Max size limit: 1024 MB per file
Specifications
Guide
Upload your video
Drop an MP4, MOV, AVI, or MKV file onto the upload zone, or click to browse. Files up to 1 GB are accepted.
Choose a quality preset
Select High (CRF 18, best quality), Medium (CRF 28, balanced), or Low (CRF 35, smallest file). Medium is recommended for sharing.
Compress and download
Click Compress Video. A progress bar tracks the encoding. Download your compressed MP4 when done — the output size and savings percentage are shown.
Key features
H.264 encoding via FFmpeg.wasm
Uses the industry-standard H.264 codec running entirely in WebAssembly inside your browser - no plugins, no installs.
Three quality presets
High (CRF 18) keeps near-original quality. Medium (CRF 28) is the best all-rounder. Low (CRF 35) achieves the smallest file size.
Up to 1 GB input
Handles large video files - up to 1 GB per file - without needing to upload to a cloud service.
MP4 output
All compressed videos are exported as MP4 with H.264 video and AAC audio for maximum device and browser compatibility.
Real-time progress tracking
A progress bar shows encoding progress so you always know how much time is left.
Frequently asked questions
Yes, everything runs in your browser using FFmpeg.wasm. No file is uploaded to any server, no server ever processes your video, and your file never leaves your device.
MP4, MOV, AVI, and MKV for input. The output is always MP4 (H.264 + AAC) for maximum compatibility across devices and platforms.
Up to 1 GB per file. Compression is CPU-intensive in a browser environment — a 200 MB video typically takes 1–4 minutes depending on your device.
Yes, it works on any modern browser — desktop or mobile. Compressing large files on mobile will take longer due to limited CPU, but it works.
Yes, completely free. No signup, no account, no watermark, and no daily quota. Just open the page and start using it.
Learn more
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