Video Compressor

We use FFmpeg compiled to WebAssembly, running entirely in your browser. Your video is re-encoded with optimized settings to reduce file size while maintaining watchable quality. No data is uploaded to any server.

Input: MP4, MOV, AVI, MKV, WebM, and most common video formats. Output is always MP4 (H.264 + AAC) for maximum compatibility.

Processing happens in your browser, so it depends on your device memory. Most devices handle videos up to 500MB-1GB comfortably. Very large files may be slow.

Typically 40-80% reduction depending on the original encoding. A 100MB video often compresses to 20-40MB with good visual quality.

Yes. FFmpeg runs entirely in your browser via WebAssembly. Your video never leaves your device — no upload, no server, no cloud processing.

Video encoding is computationally intensive. Browser-based compression is slower than native software, but means zero installation and complete privacy. Expect 1-5 minutes for a typical 5-minute video.

The first time you compress, the tool downloads the FFmpeg WebAssembly engine (~31MB) from a CDN. This only happens once — after that it is cached in your browser and subsequent compressions start immediately. You will see a "Loading FFmpeg engine..." status with a progress bar during this initial download.

Social (480p) gives the smallest file size, ideal for messaging apps and social media. Balanced (720p) is the default — good quality with meaningful size reduction. High Quality (1080p) preserves more detail but produces larger files. You can also fine-tune the quality slider independently: lower values mean higher quality and larger files.

Yes. After compression completes, the result panel shows your original file size, compressed file size, and the percentage reduction — along with animated bars visualizing the difference. The total processing time is also shown.

It works on modern mobile browsers, but video encoding is CPU-intensive. Phones handle short clips (under 2 minutes) well; longer videos may be slow or run out of memory. For large files, use a desktop browser.

Desktop tools like HandBrake offer more advanced options and faster encoding. Our advantage is zero installation, complete privacy (no uploads), and instant access from any device. For quick one-off compressions, browser-based is more convenient.

Currently one video at a time. After downloading the compressed result, click "Change video" to process the next file. The FFmpeg engine stays cached, so subsequent compressions start faster.

No. Audio is preserved and re-encoded as AAC at 128kbps. The compression targets the video stream, not the audio. You can play the result in the preview player to verify audio quality before downloading.

Yes. Output is MP4 (H.264 + AAC) with faststart enabled — the most universally compatible format. It works on Instagram, TikTok, X, WhatsApp, and every major platform. For social posts, the Social (480p) preset is ideal. Need to resize images for social too? Try our <a href="/ai/image/resize">Image Resizer</a>.

They share the same privacy-first approach — all processing in your browser. If you also need to shrink images, check <a href="/ai/image/compress">Image Compressor</a>. For documents, our <a href="/ai/pdf/compress">PDF Compressor</a> works the same way.