Productive ToolboxBionic Reading Converter
Bold the first letters of every word, Bionic Reading style, with adjustable emphasis, and copy the result as rich text, HTML or Markdown.
Bionic Reading Settings
Display Options
Input Text
Bionic Reading Preview
Related tools
How Bionic Reading Works
When you read, your eyes do not glide smoothly along a line: they jump from word to word in quick movements called saccades and pause briefly on each fixation. Bionic Reading bolds the start of every word to give each fixation an anchor, on the theory that the brain recognises the rest of a familiar word from its first letters.
30% bold
Reading is a habit that grows stronger with practice
50% bold
Reading is a habit that grows stronger with practice
The bold share is rounded up, so a three-letter word at 50% gets two bold letters. Numbers are left alone, and you can choose to leave short words such as a, of and the in regular weight.
What the Research Says
Bionic Reading went viral in 2022 with claims of faster reading, but controlled tests have not backed that up. Peer-reviewed studies comparing it with ordinary text, and large online reading-speed tests, found no reliable improvement in reading speed or comprehension for the average reader.
That does not mean it is useless for everyone. Reading comfort is personal, and some people, including some with ADHD, say the bold anchors help them keep their place or stay engaged with long text. The best test is your own: time yourself reading a page in each style and see which you prefer.
How to Use the Bionic Reading Converter
- 1Paste your text: Paste an article, email or study notes, or upload a text file.
- 2Set the emphasis: Choose how much of each word is bold, from about a third to most of the word; 40–50% is typical, and you can leave short words like 'the' and 'of' plain.
- 3Adjust the display: Change the font size, line height and theme until the preview is comfortable to read.
- 4Copy or export: Copy the result as rich text for Word or Google Docs, as HTML for a web page or as Markdown, or download it.
Frequently Asked Questions
What is Bionic Reading?
A typographic style, introduced by Swiss designer Renato Casutt, that prints the first part of every word in bold. The idea is that the bold letters act as fixation points, so the eye can skim and the brain fills in the rest of the word.
Does Bionic Reading make you read faster?
The evidence says not on average. Peer-reviewed reading studies published since the style went viral in 2022, and large informal reading-speed tests, found no meaningful gain in speed or comprehension compared with normal text. Some people simply find it more pleasant or easier to stay focused, so it is worth trying on yourself.
Does Bionic Reading help with ADHD or dyslexia?
Some readers with ADHD report that the bold anchors help them keep their place, but there is no solid research showing a benefit for ADHD or dyslexia. For dyslexia, larger text, more spacing between letters and lines, and familiar sans-serif fonts have more support.
How much of each word should be bold?
Around half is the usual setting: in 'reading', the first three letters (rea) are bold at 40% and the first four (read) at 50%. Less bold looks calmer; more bold is heavier to read. This tool rounds up, so every word gets at least one bold letter.
Can I use Bionic Reading in Word, Google Docs or Kindle?
Copy the result as rich text and paste it into Word, Google Docs or an email and the bold is kept. For e-readers, export HTML and convert it to an e-book with a tool such as Calibre.
Is my text sent anywhere?
No. We do not collect or store what you enter.
Related Tools
Sentence Case Converter
Convert text to uppercase, lowercase, title case, or sentence case.
Fancy Text Generator
Copy-and-paste bold, italic, script and bubble Unicode fonts.
Upside-Down Text Generator
Flip, mirror, and decode Unicode text with preset styles.
Leetspeak (1337) Converter
Encode and decode 1337 text with presets, intensity, and random variation options.
Reading Time Calculator
Estimate read and speaking duration with multi-speed profiles, custom WPM, and badge-ready output.
White Space Remover
Clean leading/trailing spaces, extra gaps, tabs, and empty lines.
Table to Markdown
Convert CSV, TSV, or spreadsheet data into aligned markdown tables.
Anagram Finder
Find every word you can make from a set of letters, and check anagrams.
Palindrome Checker
Check single or bulk text for palindromes with rule-based filtering.
Text-to-Slug Converter
Convert single or bulk titles into SEO-friendly URL slugs.
Morse Code Translator
Translate text and Morse code with audio playback and custom symbol settings.
Random Name Picker
Run fair random winner draws with duplicate control, multi-pick, and export history.