Interface collision test
Run long text, RTL, large text and narrow layout checks.
Upload HTML you own or are authorized to test. We strip JavaScript and measure the static layout in an opaque sandbox: 900 px baseline, text expansion, RTL, 175% fonts and 320 px. Dynamic application behavior, translation quality and all visual collisions are outside this test.
Limits: upload 10 MB, extracted 15 MB, 150 entries, each entry 3 MB, HTML 500 KB / 2,500 elements. Files remain in this tab.
Static assets: up to 20 PNG/JPG/still WebP images, 2 megapixels each; up to 4 WOFF/WOFF2 fonts, 4 MB expanded each. Animated images and CSS animations are disabled. Unsupported or oversized images appear as placeholders.
How it works
- Review your inputs and the supported scope.
- Set constraints, run the operation and inspect the evidence.
- Reopen downloaded output before using it.
Example & practical use
Enter your own files or measurements; review the computed result and its stated limits.
Limits and help
Authorized uploaded static designs; measured overlap candidates need human review.
Your files are yours.
Image and text processing happens in your browser. Your files are not uploaded to our servers.
Troubleshooting
Try the small example on this page first. If it works, check your input format and size limit. Save any needed input before reloading. You do not need to share a file or password to report an issue.