Viewport

Ship text that fits
every screen

Textproof catches overflow, line-wrap drift, and font-size issues before your users do. Run it against any live page.

What it catches

Verifies text layout across 9 breakpoints (375px–1920px) using real DOM measurement

⚠️

Finds text bleeding outside containers at any breakpoint — especially mobile where it matters most.

↔️

Compares line counts across viewports to catch unexpected reflows that break your layout.

📏

Suggests clamp() values that keep text readable from the smallest phone to the largest monitor.

Textproof found 3 warnings in the responsive text above.

PASS

Hero H1 — fits all breakpoints with clamp()

WARN

Feature cards overflow slightly at 375px

WARN

Card headings at 768px reflow differently than desktop

WARN

Button text fits, but padding varies across breakpoints

PASS (69 total)

Everything else verified at 9 breakpoints

Run textproof against this page or any live site