Reduce video file size without losing much quality.
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A video compressor shrinks the file size of a video while trying to keep as much visual quality as possible. This is useful when a clip is too large to email, too slow to upload to social media, or simply taking up too much space on your phone or laptop.
Our video compressor runs the industry-standard FFmpeg engine directly inside your browser tab using WebAssembly. That means the moment you drop a file into the box above, nothing is sent anywhere — the compression happens locally, on your own device, using your own CPU. There is no queue, no server-side processing limit, and no risk of your video sitting on someone else's storage.
Under the hood, the tool re-encodes your video with the H.264 codec and lets you choose a compression level. A lower CRF (constant rate factor) value keeps more detail and produces a larger file; a higher value compresses harder and produces a smaller file at the cost of some sharpness. We've mapped this to three simple presets — Light, Balanced, and Maximum — so you don't need to understand codec settings to get a good result.
This tool works well for shrinking phone-recorded videos before sending them over WhatsApp or email, preparing clips for faster website loading, or fitting a video under a platform's upload size limit. Because everything happens client-side, very large files may take a little longer depending on your device's processing power, but there is no arbitrary file-size cap imposed by us.
For best results, start with the Balanced preset. If the output is still too large, re-run the tool on the compressed file with the Maximum preset, or trim unnecessary sections first using our Video Trimmer tool before compressing.
Compression settings involve a trade-off between file size and visual fidelity, and the right choice depends on what you're using the video for. A clip destined for a WhatsApp group chat can tolerate heavy compression because it will be viewed on a small phone screen, while a video meant for a large presentation screen benefits from the Light setting to keep fine detail crisp.
One thing many people don't realize is that re-compressing an already-compressed video repeatedly causes cumulative quality loss known as generation loss. Whenever possible, always compress from the original, highest-quality source file rather than compressing a file that has already been compressed once before, to get the best possible balance of size and clarity.
Unlike installing a heavyweight desktop video editor just to shrink one clip, this tool needs no download, no account, and no learning curve — you get the same FFmpeg encoding engine used by professional software, wrapped in a single click. It also works identically on Windows, Mac, Chromebook or Linux, since everything runs inside the browser rather than depending on platform-specific software installers.
It's also worth remembering that resolution and compression are two separate levers: if a video is still too large after maximum compression, reducing its resolution first (for example from 4K down to 1080p) with our Video Resizer, and then compressing the smaller-resolution file, will typically get you a much smaller result than compression alone can achieve.
Yes, to some degree — compression works by discarding some visual information. Our Balanced preset is tuned to keep quality loss barely noticeable for most content.
There's no limit imposed by us, but very large files depend on your device's available memory and processing power since everything runs in your browser.
No. All processing happens locally in your browser using WebAssembly — your file never leaves your device.
MP4, MOV, WEBM, MKV and AVI files are all supported as input.