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Bionic Reading highlights the first letters of each word so your eyes can fixate faster while your brain completes the rest. Paste an article, adjust fixation, and read the preview. Export HTML for a site or Markdown for notes.
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Bionic Reading converter

Convert text to Bionic Reading by bolding the start of each word. Adjust fixation, preview live, copy HTML or Markdown—local-first, no signup.

What is a Bionic Reading converter?

A Bionic Reading converter turns plain text into Bionic Reading mode by bolding the first letters of each word. The method, associated with Renato Casutt, aims to help some readers move through lines faster by guiding fixation. This free local-first tool lets you adjust fixation, preview the result, and export HTML or Markdown—it does not import PDF or EPUB files.

Bionic Reading converter features

Controls for converting text to Bionic Reading mode.

  • Live preview

    See bolded word starts update as you edit text or fixation.

  • Fixation slider

    Choose how much of each word is highlighted, from light to heavy.

  • High contrast option

    Fade the unbolded letters so the fixation points stand out more.

  • HTML and Markdown export

    Copy or download markup for sites, notes apps, or docs.

How to convert text to Bionic Reading

From pasted text to exportable markup.

  1. Paste your text

    Drop an article, notes, or any plain text into Original text.

  2. Tune fixation

    Move the slider and optionally enable high contrast on the rest letters.

  3. Copy or download

    Pick HTML or Markdown, then copy, download, or open the result in a new tab.

Tips for Bionic Reading text

Get a clearer conversion.
  • 01

    Start around 50%

    Medium fixation is a good default before pushing higher or lower.

  • 02

    Try high contrast on dense pages

    Faded rest letters can help on long paragraphs.

  • 03

    Use Markdown for notes

    Paste into Notion, Obsidian, or GitHub when you want portable bold markers.

  • 04

    Use HTML for a webpage

    Drop the markup into an article template when you control the styles.

Great for

When a Bionic Reading converter helps.

  • Long articles

    Reformat blog posts or research notes before a focused reading pass.

  • Study notes

    Highlight word starts in lecture text you already pasted.

  • Accessibility experiments

    Test whether fixation styling helps your own reading comfort.

Why convert here

Fast local Bionic Reading markup.

  • Local-first

    Text never leaves the browser for this conversion.

  • Free

    No signup and no watermark on the export.

  • Instant

    Preview updates as you type—no separate convert click.

  • Two formats

    HTML for the web, Markdown for notes.

Technical notes

How this Bionic Reading converter works.
Tokenization
Unicode letter sequences (including simple apostrophe contractions) are treated as words; punctuation and spaces stay as-is.
Fixation
Each word bolds ceil(length × fixation%), with at least one letter on multi-letter words.
HTML output
Uses <b> for bold spans; high contrast wraps the rest in a lower-opacity span.
Markdown output
Wraps the bold prefix in **…** markers compatible with common Markdown renderers.
Runtime
Client-side only in modern browsers.

Sources & References

Background on Bionic Reading and presentational bold markup.
  • “It guides the eye through text using artificial fixation points: the opening letters of each word are emphasised, so the eye moves from one fixation point to the next while the brain completes the rest of the word.”
    — Bionic Reading® — Method

    Bionic Reading — method: Official description of fixation-point highlighting. This converter applies a similar visual pattern to pasted text. Not affiliated with Bionic Reading AG. bionic-reading.com/br-method/

  • “The HTML b element is used to draw the reader's attention to the element's contents, which are not otherwise granted special importance.”
    — MDN Web Docs — <b>: The Bring Attention To element

    MDN — b element: HTML export wraps each word’s fixation prefix in <b> for presentational bold weight, which fits fixation highlighting better than semantic <strong>. developer.mozilla.org/en-US/docs/Web/HTML/Element/b

Frequently Asked Questions

Quick answers about this tool—open a question to read more.