Free Developer Tools
JavaScript Text Layout Tools
A small set of free, no-sign-in tools for the everyday text-measurement problems developers hit — width, wrapping, truncation, and fitting. Each one runs in your browser and is powered by Pretext.js, the zero-reflow text engine.
Paste text, choose a font, size, and weight, and get the exact rendered pixel width — plus per-line widths.
Measure Text Width →Find how many lines text wraps to and how tall it renders at any container width and line height.
Text Wrap Calculator →Generate -webkit-line-clamp / ellipsis CSS with a live preview, and see whether your text actually overflows.
CSS Line-Clamp Generator →Binary-search the biggest font size at which your text fits a fixed width and height box.
Fit Text to Container →Why measure text without the DOM?
Every time JavaScript reads getBoundingClientRect(), offsetHeight, or scrollHeight, the browser must flush pending layout — a forced synchronous reflow. In loops that measure many strings, this causes layout thrashing and dropped frames. These tools, and the Pretext.js library behind them, answer the same questions with Canvas measureText() and pure arithmetic — no reflow, ever. Explore the full API in the playground.