Bionic reading
Bold the leading part of each word so your eyes move through text faster.
Bionic reading
Bionic reading bolds the first part of every word and leaves the rest in normal weight, so your eyes only need to fixate on the leading letters and can glide through the remainder guided by context. The technique shows up in speed-reading apps and accessibility tools because it reduces the effort of decoding long paragraphs, articles or study notes. Paste any block of text and the result updates as you type.
The bold-portion slider controls how much of each word gets bolded — a lower value bolds just the first letter or two for a light touch, a higher value bolds most of the word for a stronger effect. Minimum word length skips words too short to need the boost, and skipping short conjunctions and prepositions additionally leaves common words like "the", "and" or "of" untouched, since bolding them adds visual noise rather than reading speed. Pick the output format that matches where you'll paste the result: HTML with <strong> tags for web pages, Markdown with double asterisks for editors and static sites, or Unicode bold characters that render as bold in plain-text fields with no markup support, such as chat apps or bare note-taking tools.
Line breaks, paragraph spacing and punctuation are left exactly as typed — only the letters inside words are touched. Words with diacritics (á, č, ő, ł and the like) are measured and split correctly by their actual letters, not raw bytes; the Unicode format bolds plain Latin letters and digits but has no bold variant for accented letters, so those pass through unstyled inside an otherwise bold word. Turn on number highlighting to apply the same bold-start treatment to standalone digits.
Everything runs locally in your browser — the text you paste is never uploaded or stored anywhere. Copy the result, download it as a .txt file, or send it straight to another tool's input to keep editing.