MP4 Compressor
Pick a quality tier and, optionally, drop the resolution for the biggest savings.
Drop files, or click to browse
MP4 files only — processed one at a time
Frequently asked questions
What's the difference between quality and resolution here?+
Quality controls how aggressively each frame is compressed; resolution controls the pixel dimensions. Lowering either shrinks the file — combine both for the biggest savings.
Will the output still play everywhere?+
Yes — the MP4 container and codec choice are kept broadly compatible with players and editors.
Is my video uploaded anywhere?+
No, compression runs locally in your browser using its own built-in media codecs.
Is there a maximum file size?+
There's no fixed upload limit — since everything runs on your device, the practical limit is your browser's available memory, which handles typical clips and even fairly long recordings without issue.
How do I compress a MP4?+
Drop your MP4 into the box above, pick a quality tier (and optionally a lower resolution), and download the smaller result once it finishes.
About MP4
What is MP4?
MP4 (usually carrying H.264 video) is the most widely compatible video container — it plays on essentially every phone, browser, and TV.
Full MP4 format guide →MP4 files can balloon quickly, especially with high-resolution source material. Compressing trims the file down to something that uploads faster, loads faster, and takes up less space — without needing to change the format itself.
How it works
- 1
Drop your file in
Drag your video onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Adjust the slider
Drag the quality slider and watch the estimated file size update in real time.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your video is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Sharing
- Uploading to social platforms
- Uploading a clip to social media
- Sending a video over email or chat
Supported formats
This is one of many pairings the video toolkit handles. In total it covers:
Other compressors
Format details
About MP4 files+
MP4 (usually carrying H.264 video) is the most widely compatible video container — it plays on essentially every phone, browser, and TV.
MP4 is a container format standardized under MPEG-4, meaning the file itself is really a wrapper that most often holds H.264-encoded video alongside AAC audio. That specific combination struck a balance efficient enough for streaming and broad enough to be adopted everywhere, which is why it's the format cameras, phones, editors, and social platforms converge on as a safe default. It isn't always the smallest or most efficient option available — newer codecs inside newer containers can do better — but nothing beats it for guaranteed playback.
How to open a MP4 file
Opens readily in Any web browser, Any modern phone, TV, or media player. For real editing, use Adobe Premiere Pro, DaVinci Resolve, iMovie.
Good for
- maximum device and platform compatibility
- good compression-to-quality ratio
Watch out for
- not the smallest option available for the same visual quality
Need another format? Try the full Video Compressor, or explore all video tools.