What does Video Resizer do?
Tubelexity resizes a local video to common horizontal, square and vertical creator dimensions. Aspect locking prevents accidental distortion, while fit, fill, letterbox and blurred-background modes decide how a source with a different shape uses the output canvas. No mode silently stretches the picture.
How to use Video Resizer
- 1Choose a local video.
- 2Select a YouTube, Shorts, Reels or TikTok-oriented preset or enter dimensions.
- 3Choose fit, fill, letterbox or blurred background.
- 4Set frame rate and quality, then resize locally.
Supported inputs and outputs
Inputs
MP4, MOV, WebM, MKV when decodable
Outputs
Resized MP4, Resized WebM
Practical uses
- Creating 1080 × 1920 vertical video
- Making square social clips
- Downscaling 4K footage
- Adding blurred space around landscape video
Browser and media limitations
- Resizing re-encodes video.
- Upscaling cannot create missing detail.
- Blurred backgrounds take longer.
- Platform recommendations can change.
How local processing works
Processing uses FFmpeg.wasm locally in this browser. The media engine downloads on first use, but Tubelexity does not upload the selected media to a processing server.
Frequently asked questions
Can I resize video without stretching it?
Yes. Every mode preserves aspect ratio.
What is the difference between fit and fill?
Fit shows the full frame with unused background space; fill crops edges so the canvas is covered.
Can I resize for YouTube Shorts?
Yes. Use 1080 × 1920 or 720 × 1280.
Does resizing reduce quality?
Re-encoding and downscaling change the image; use a high-quality CRF when detail matters.
Is processing local?
Yes.