Bionic Reading Converter
Paste any text and see it converted live, with the first part of each word bolded to guide your eyes.
Bionic reading is a reading aid; research on its effectiveness is mixed. Nothing you type leaves your browser.
How it works
- Paste or type your text into the input box — the bionic version appears instantly below.
- Drag the fixation slider to control how much of each word is bolded, from light to strong emphasis.
- Copy the result as HTML (with strong tags) or as Markdown (with **bold** markers) for use anywhere.
Frequently asked questions
- What is bionic reading and how does it work?
- Bionic reading is a formatting technique that bolds the first few letters of every word, creating artificial fixation points for your eyes. The idea is that your brain completes the rest of each word from memory, so your eyes can move through text faster. This converter applies the same principle by wrapping the leading letters of each word in bold markup.
- Does bionic reading actually make you read faster?
- The evidence is mixed. Some readers report better focus and speed, especially people with ADHD or those skimming long documents, but controlled studies have not found a consistent speed benefit across the general population. Treat it as a personal preference worth testing rather than a proven method.
- Is my text uploaded anywhere when I convert it?
- No. The conversion runs entirely in your browser with JavaScript — nothing is sent to a server. You can paste private notes, drafts, or work documents and they never leave your device.
- What does the fixation slider change?
- It sets what fraction of each word gets bolded, from roughly 30% to 70% of its letters. Lower values give a subtle effect that suits confident readers; higher values bold more of each word, which some people find easier to anchor on. The default of around 45% matches the ratio most bionic reading tools use.
- Where can I paste the HTML or Markdown output?
- The HTML output uses standard strong tags, so it works in emails, web pages, CMS editors, and rich-text fields that accept HTML. The Markdown output uses double asterisks for bold, which works in Notion, Obsidian, Discord, GitHub, Reddit, and most note-taking apps.
About this tool
This bionic reading converter transforms ordinary text into a format where the first portion of every word appears in bold. These bolded fragments act as fixation anchors: your eyes land on them, and your brain fills in the remaining letters automatically. The result is text that some readers can scan noticeably faster, or at least with less effort, because the eye has clear stepping stones instead of a uniform wall of characters.
Everything happens locally in your browser. The converter splits your text into words, calculates how many leading letters to bold based on the fixation setting, and rebuilds the text with bold markup — live, as you type. No account, no upload, no server round-trip, which means it is safe for confidential material and works offline once the page has loaded. Punctuation, numbers, and line breaks are preserved exactly as you entered them.
Two export formats cover most destinations. The HTML button copies the text with strong tags, ready for web pages, newsletters, or any rich-text editor. The Markdown button copies the same text with **bold** markers for Notion, Obsidian, Discord, or GitHub. Both outputs are plain text under the hood, so you can also paste them into a code editor and adjust by hand.
A practical note on expectations: bionic reading is a reading aid, not a proven accelerator. Research results are mixed — some individuals, particularly those who struggle with focus, find it genuinely helpful, while controlled studies on larger groups show little average speed gain. The sensible approach is to convert a page of something you actually need to read, try a couple of fixation levels, and keep the format only if it feels easier for you.