Dev & Data ToolboxVideo Resizer
Resize videos to common presets or custom sizes. All processing happens locally in your browser.
Video Resizer
Resize videos to common presets or custom dimensions directly in your browser. Maintain aspect ratio, choose frame rate and quality, and export in WebM with complete privacy—your files never leave your device.
How to Use in 3 Steps
Upload
Drag & drop your MP4/MOV/WebM file or click to select.
Set Size
Pick a preset (1080p, 720p, 480p, 1:1) or enter custom width/height.
Resize
Click Resize to process locally and download the result.
Key Features
- ✓ 100% client-side processing
- ✓ Maintain aspect ratio or set exact size
- ✓ Presets: 2160p, 1440p, 1080p, 720p, 480p, 360p, 1:1
- ✓ FPS and quality controls
- ✓ Optional audio preservation
- ✓ WebM (VP8/VP9) export
Frequently Asked Questions
Are my videos uploaded?
No. All processing happens in your browser using Canvas and MediaRecorder APIs.
What formats are supported?
Most browser-playable inputs (MP4/H.264, MOV, WebM). Output is WebM for broad in-browser support.
Will audio be kept?
Yes, if the browser allows combining canvas video with the original audio track.
Any size limits?
Limited by your browser memory/CPU. For most devices, keep under 100–200MB.
Is it free?
Yes—no registration, no watermarks, no uploads.
Why WebM output?
WebM is natively supported for in-browser encoding. MP4 (H.264) encoding isn’t supported natively.
Does it change aspect ratio?
By default, aspect ratio is preserved. You can override with custom dimensions.
Can I trim?
For trimming, use Video to GIF or Audio Trimmer; trimming for video export may be added later.
Technical Information
Processing
Canvas draws video frames at the chosen size. The canvas stream is recorded to WebM using MediaRecorder. Audio track is merged when available.
Browser Support
Latest Chrome/Edge/Firefox. Safari supports MediaRecorder for video in recent versions.