Video Aspect Ratio Converter
Free online video aspect ratio converter. Change between 4:3, 16:9, 9:16, 1:1, and any other ratio by stretching. Fast and private.
Drop files here or click to browse
Max 10240.0 MB per file · drop multiple for batch
100% private — files never leave your device
·Free — no sign up, no watermark
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How to Use Video Aspect Ratio Converter
- Upload the video to convert
- Set the stretch factor for your target ratio
- Click Process
- Download the converted video
Features
- Convert between any aspect ratios
- Supports 4:3, 16:9, 9:16, 1:1, and more
- Adjustable stretch factor for precise control
- Free, private, browser-based
Frequently Asked Questions
- What aspect ratios can I convert between?
- Any. Common conversions include 4:3 → 16:9 (~1.33x stretch), 1:1 → 16:9 (~1.78x), 9:16 → 16:9 (~3.16x), and 16:9 → 4:3 (use a value below 1). Adjust the stretch factor to match any target ratio.
- How is this different from cropping or letterboxing?
- Stretching changes the aspect ratio by distorting the content to fill the new frame. Cropping cuts edges to fit. Letterboxing adds black bars to fit. Each approach has trade-offs — stretching keeps all content but introduces distortion.
- Is this aspect ratio converter free?
- Yes, completely free with no watermarks, no signup, and no file uploads. Everything runs locally in your browser.