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Ubify Media & Design Operations
UI/UX & DIGITAL MEDIA SPECIALISTS
About This Tool
Compress Video Online shrinks video file sizes locally inside your browser session. Many chat systems, email providers, and ticket portals enforce attachment caps between 10 MB and 25 MB, blocking recorded phone clips or screencasts.
This utility takes your video, scales the resolution, and re-encodes the visual stream using your device's MediaRecorder hardware or software pipeline. You can pick Balanced compression (80% frame dimensions at 1.5 Mbps), High Compression (60% frame dimensions at 800 kbps), or a Target File Size profile.
### How the In-Browser Compression Works 1. Resolution Scaling: The video frame is drawn onto an HTML5 canvas at scaled proportions (60% to 80% of original dimensions depending on mode). 2. Canvas Stream Capture: The canvas generates a 24 fps video stream for local re-encoding. 3. MediaRecorder Encoding: The browser's native MediaRecorder compresses the video stream into a WebM container using VP9 or VP8 codecs. 4. Local Blob Download: The finished compressed video is delivered as an in-memory blob for immediate download to your computer or phone.
### Concrete Compression Example Upload a 30-second 1080p clip with an initial size of 24.5 MB. Choose the "Balanced" preset (80% scaling, 1.5 Mbps bitrate target). Click "Compress Video". The player processes the clip across an internal canvas stream, reducing the output size to approximately 11.2 MB as a downloadable WebM file, ready for email or chat delivery without leaving your browser.
### Processing and Privacy All video decoding, frame scaling, and video encoding run locally in your web browser. No video frames, audio tracks, or files are uploaded to remote servers or cloud storage.
How to Use
- 1
Select or drag an MP4 or WebM video file into the upload zone, or click "Load Sample Video".
- 2
Choose your compression preset: Balanced (80% scale), High Compression (60% scale), or Custom Target MB.
- 3
Click "Compress Video" to begin local canvas stream encoding and monitor progress.
- 4
Preview the compressed video in the browser player and click "Download WebM" to save the file.
Frequently Asked Questions
What video formats can I compress with this tool?
You can upload standard browser-supported video formats such as MP4 and WebM. The output file is packaged as a WebM video using your browser native VP9 or VP8 encoding pipeline.
Does this tool upload my video to a server?
No. The video is decoded onto an in-memory HTML5 canvas element and re-encoded locally using the browser MediaRecorder API. Zero video bytes leave your computer.
Why does the compressed file export as WebM instead of MP4?
Standard web browsers support local client-side recording and encoding natively through the WebM format (VP8/VP9 codecs). Client-side MP4 generation requires heavy third-party WebAssembly bundles, whereas WebM encoding runs directly through native browser APIs.