Bionic Reading Converter
Convert text into bionic reading format — with the leading letters of each word bolded to guide your eyes and help you read faster.
What is bionic reading?
Bionic reading is a text formatting technique that bolds the first few letters of each word, creating fixation points that your eyes can latch onto as they scan a line. The idea is that your brain can complete the rest of a familiar word automatically once it recognizes the bolded start, which can make reading feel faster and reduce the effort of tracking each word individually.
This tool converts any text into bionic reading format, with a live preview and the option to copy the result as HTML or as plain text wrapped in **bold** markers.
How to use it
How the conversion works
Each word is split from surrounding punctuation and spacing, and roughly the first 40% of its letters are wrapped in a bold tag — with very short words (three letters or fewer) always getting just their first letter bolded. The rest of the word, plus any punctuation, is left as plain text.
Why it helpsFeatures & benefits
Why this runs entirely in your browser
The conversion runs in JavaScript locally in the tab, which means it keeps working offline once the page has loaded and nothing typed here is ever sent to a server.
Common uses
Formatting study notes or articles to skim faster, experimenting with bionic reading to see if it helps your focus, or preparing text for a blog post or document that supports bold formatting.
Frequently asked questions
A few things people usually want to know before trusting the numbers.
Results vary by person — some readers find it helps them scan text faster, while others notice little difference or find it distracting. It's worth trying on your own text to see if it works for you.
Roughly the first 40% of the word's letters, with short words of three letters or fewer always getting just the first letter bolded.
"Copy as HTML" gives you real <b> tags to paste into a rich text editor or website. "Copy as **bold** text" wraps the bolded part in double-asterisks instead, for Markdown or chat apps that use that syntax.
Yes. Punctuation and spacing around each word are preserved exactly, and only the letters and digits of the word itself are considered for bolding.
No. All conversion happens locally in your browser. Nothing typed or pasted here is sent to a server, stored, or shared.