Video
Video aspect-ratio calculator
Get 16:9 or 9:16 from pixel dimensions without a timeline app.
This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.
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What this tool does
The same GCD reduction as the image calculator, with video-oriented copy. Anamorphic samples (non-square pixels) are not interpreted.
How to use it
- Enter width and height or drop a video.
- Read the ratio.
- Check platform presets if you need a named export.
Supported input
- Positive pixel dimensions or a video file
Output
- Simplified ratio
Privacy
This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.
ConvertPass does not include your input in analytics, URLs, or error reports. Encoding: N/A. Limit: 80 MB if using a file (80.00 MB).
Limitations
- Pixel aspect ratio other than 1:1 is ignored.
- Letterboxing inside the frame is not detected.
Example
1080 × 1920
9:16
Troubleshooting
- A 1920×1080 file reports 1920×1040
- The stored picture may include unused lines, or the browser reported a different coded size. Trust a media inspector if you need bitstream accuracy.
FAQ
Is 16:9 always 1920×1080?
No. 1280×720 and 3840×2160 are also 16:9.
What about 2.39:1 cinema?
Enter the actual pixels. The simplified ratio may be a large pair of integers.
Can I compute pillarbox sizes?
Not automatically in this version.
Does this transcode?
No.
Related tools
- Image aspect-ratio calculator
Simplify pixel dimensions to a ratio such as 16:9 or 4:3.
- Social video export settings
Use researched starting points for social exports, with the re-encode caveat attached.
- Video file inspector
Read duration and resolution from a video without uploading it.
Related guides
Related formats
Last reviewed 16 August 2026. Report a problem. Reports do not include your input.