Video Compressor — Free Online MP4 Compressor
Compress MP4, MOV, WebM and other video files in your browser. Choose a quality preset or type your exact target file size in MB and download the compressed MP4 instantly — no upload, completely private.
Drag & drop your video here
MP4, MOV, WebM, AVI — any video format
About this tool
Our free Video Compressor lets you reduce the file size of MP4, MOV, WebM, AVI, and other video formats directly in your browser — no uploads to any server, no account required. Choose your target output size in megabytes and the tool automatically calculates the right bitrate to hit that size. Or use one of the four quality presets (Low, Medium, High, Maximum) for quick compression without manual settings. Under the hood, the tool uses FFmpeg compiled to WebAssembly (WASM) and re-encodes your video in H.264 format with AAC audio — the same industry-standard codec used by MP4 files everywhere. The output downloads as a standard MP4 file that plays on every device: iPhone, Android, Windows, Mac, smart TVs, and every major platform. Because everything runs locally in your browser, your videos never touch a server and remain completely private.
How to use — step by step
- 1
Open the Video Compressor
Go to the free Video Compressor on Instant Tools Hub. The tool uses FFmpeg compiled to WebAssembly — a one-time 8 MB download on first use.
- 2
Upload your video
Click Upload or drag and drop your MP4, MOV, WebM, or AVI file onto the upload area.
- 3
Choose compression method
Select 'By quality' (Low/Medium/High/Max) for quick compression, or 'By target size' to set an exact output size in MB — useful for WhatsApp's 16 MB limit.
- 4
Start compression
Click Compress Video. The tool re-encodes your video in H.264 format in your browser. Time depends on video length and your device speed.
- 5
Download the compressed video
Click Download when compression finishes. The output is a standard MP4 file that plays on any device. No video was uploaded to any server.
Common use cases
WhatsApp video sharing
WhatsApp has a 16 MB file limit for video. Compress your video to under 16 MB so it sends without being auto-reduced to a blurry clip.
Email attachments
Reduce a video to under 10 MB so it fits within the attachment limit of Gmail, Outlook, and corporate email servers.
Social media uploads
Compress videos to the optimal file size for Instagram Reels, Twitter, or Facebook without paying for a subscription video editor.
Storage and archiving
Reduce the file size of large recordings, lectures, or screen recordings before saving them to Google Drive, OneDrive, or a USB drive.
Frequently asked questions
How to compress video for WhatsApp free online?
Upload your video to our free Video Compressor, select 'By target size', set it to 15 MB (just under WhatsApp's 16 MB limit), and compress. Download the compressed MP4.
How to reduce video file size free online?
Use our browser-based Video Compressor. Upload your MP4, choose quality level, and download a smaller file instantly — no software installation, no server upload.
How to compress MP4 video without losing quality?
Set compression to 'High' quality mode. This reduces file size significantly while keeping video quality good. For maximum quality retention, use 'Max' setting.
What video formats does the compressor support?
You can upload MP4, MOV, WebM, AVI, and MKV files. The output is always a standard MP4 file that plays on any device.
Is the video compressor completely free?
Yes. The tool is free with no file size limits, no watermarks, and no sign-up. Processing happens entirely in your browser using FFmpeg WebAssembly.
Why does the video compressor need to download 8 MB first?
The compression engine (FFmpeg compiled to WebAssembly) is about 8 MB. It downloads once and is cached by your browser, making all future compressions instant.