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Ubify Media & Design Operations
UI/UX & DIGITAL MEDIA SPECIALISTS
About This Tool
Trim Video Online cuts video files to specific start and end timestamps directly inside your web browser. Built for editing social media clips, shortening screencasts, and removing unwanted intro or outro pauses, the tool processes frames locally using standard HTML5 video playback and media stream recording.
### In-Browser Video Processing Architecture
Rather than uploading multi-gigabyte video files to cloud rendering queues, trimming executes directly on your machine: - **Local File Access:** Selected video files load into browser memory via Blob URLs (`URL.createObjectURL`), meaning your files never leave your computer. - **Interactive Range Selection:** Dual timeline inputs allow setting starting and ending boundaries to precise fractions of a second. - **Canvas Stream Recording:** When you click "Trim Video", the tool plays the selected segment across an off-screen HTML5 `<canvas>` surface and captures the video frames into a clean WebM file using the standard `MediaRecorder` API.
### Worked Editing Example
Trimming a 30-second camera recording down to an 8-second highlight: 1. Load a video file (`presentation_take1.mp4`, duration 30.2 seconds). 2. Set the **Start Time** to **4.5** seconds to skip the initial camera adjustment. 3. Set the **End Time** to **12.5** seconds to isolate the key demonstration. 4. Click **"Trim Video"** to capture the 8.0-second interval. 5. Download the exported WebM video directly to your storage drive.
### Processing Transparency
All video frame decoding, timeline slicing, and WebM encoding take place 100% locally in your browser. No video streams, audio tracks, or file metadata are transmitted across the internet.
How to Use
- 1
Click "Choose Video File" or drag and drop an MP4, WebM, or MOV file into the dropzone.
- 2
Adjust the Start Time and End Time input values to designate your desired clip window.
- 3
Click "Trim Video" to initiate in-browser canvas stream recording.
- 4
Preview the trimmed clip in the output player and click "Download Trimmed Video".
Frequently Asked Questions
What video file formats does this tool output?
The browser encodes trimmed clips into standard WebM format using native MediaRecorder video codecs (VP9 or VP8), playable in all modern media players and browsers.
Is there a file size limit for trimming videos?
Because video processing occurs entirely inside your device RAM without uploading to a server, file size limits depend on your computer memory rather than server bandwidth.
Are my private videos uploaded or saved on remote servers?
No. The entire trimming workflow executes within your local browser sandbox. No video bytes or audio tracks leave your computer.