Offline Video Compressor

Local video compression with quality presets and FFmpeg WebAssembly. Files never leave your device.

🔥 Compress videos and reduce video file size directly in your browser. 100% local processing, no uploads, no sign-up, and no watermark. Video Compressor is a free, privacy-focused tool for everyday video compression. Powered by FFmpeg WebAssembly, it shrinks large videos on your own device and saves a widely compatible MP4 (H.264 + AAC). Make videos easier to share while saving storage space — without sending your footage to a server. COMPRESS VIDEO IN 4 STEPS 1. Click the toolbar icon to open the video compressor in a new tab. 2. Drag and drop a video, or click to choose a file. 3. Choose a quality preset, then optionally adjust the resolution, frame rate, or audio. 4. Click Compress and download your smaller MP4. KEY FEATURES • Private, local video compression — your files never leave your device • Free to use, with no account, watermark, or usage limits • Supports a wide range of common video formats through FFmpeg • Exports widely compatible MP4 (H.264 + AAC) files with faststart for smooth web playback • Three quality presets: HD for quality, Balanced for everyday sharing, and Small for minimum file size • Reduce video resolution to 1080p, 720p, or 480p, or keep the original — downscale only, never upscale • Lower the frame rate to 60, 30, or 24 fps, or keep the original — no duplicated frames • Portrait-aware scaling caps the short side, preserving detail in vertical phone videos • Keep the audio track or remove it to create an even smaller video • Multi-threaded encoding for faster processing, with automatic single-threaded fallback • Compare original and compressed file sizes and see exactly how much space you saved • Automatically detects source duration, resolution, and real frame rate for smarter compression • Remembers your last settings for the next video • Works offline after the first run once the FFmpeg engine is cached • Light and dark themes • English and Simplified Chinese interface GOOD TO KNOW • Supports videos up to 700 MB. High-resolution sources such as 4K require more memory; if compression fails, set the resolution cap to 720p and try again. • The first run downloads and caches the FFmpeg WebAssembly engine — never your video. Keep the compression tab open until processing is complete. --- Need a simple way to compress video without uploading it? Add Video Compressor and make your first video smaller today. Questions or feedback? Contact us via the email button on the extension page.