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Bionic Reading Converter

Bold the leading part of every word to guide your eyes across the page, with an adjustable emphasis strength and a light or dark preview.

Converted live as you type. Text never leaves your browser.

Higher strength bolds more of each word. With short words off, words of three letters or fewer are left plain.

Preview

Preview theme
The converted text will appear here.

How to convert text to bionic reading

  1. Paste your text

    Drop the passage you want to read into the input and the emphasised version appears in the preview immediately.

  2. Tune the emphasis

    Slide the emphasis strength up or down, and choose whether short words are emphasised, until the preview reads comfortably.

  3. Pick a preview theme

    Switch the preview between light and dark to see how the emphasis looks against the background you will read on.

  4. Copy the formatted text

    Use Copy formatted text to grab the result with its bold formatting intact, ready to paste into a document or a note.

Why use this tool

Adjustable emphasis strength

A slider from 30 to 70 percent controls how much of each word is bolded, so you can set a light touch or a strong lead as you prefer.

Smart short-word handling

Turn emphasis off for words of three letters or fewer to keep small joining words quiet, or leave it on to emphasise every word evenly.

Punctuation stays clean

Only the leading letters of a word are bolded. Trailing punctuation, numbers, and symbols attached to a word are left as they are.

Light and dark preview

Preview the emphasised text on a light or a dark panel so you can judge the effect against the background you actually read on.

Copies with formatting

The copy action keeps the bold formatting, so pasting into a document that accepts rich text carries the emphasis across, with a plain-text fallback.

Runs entirely in your browser

Everything happens on your device. The text you paste is never uploaded or stored anywhere.

About this tool

Bionic reading is a formatting style that bolds the first part of each word and leaves the rest lighter. The idea is that your eyes lock onto the bold lead and let your mind fill in the remainder, so they skim across a line with fewer stops. This converter applies that treatment to any text you paste, bolding a leading fixation portion of every word while keeping the tail plain, and shows the result in a live preview as you type.

You control how strong the effect is. The emphasis slider runs from a light 30 percent to a heavier 70 percent of each word, and a toggle decides whether very short words get emphasised at all, since bolding every two-letter word can feel busy. Only the letters at the start of a word are bolded, so punctuation, numbers, and symbols hanging off a word stay untouched and the text remains clean. A light or dark preview lets you check the effect against the background you will actually read on.

When the preview looks right, Copy formatted text puts the result on your clipboard with the bold formatting preserved, so pasting into a document, an email, or a note that accepts rich text carries the emphasis across; a plain-text copy is included as a fallback. It sits alongside the rest of the reading set: Reading Time Calculator estimates how long a passage takes, Word Counter gives exact counts, and Readability Checker scores how hard the text is. Everything runs in your browser, so nothing you paste is uploaded.

Frequently asked questions

What is bionic reading?
It is a formatting style that bolds the leading part of each word and leaves the rest lighter. The bold lead gives your eyes a fixation point, which some readers find helps them move through text faster and with less effort.
Can I control how much of each word is bolded?
Yes. The emphasis slider sets how much of each word is bolded, from a light 30 percent to a stronger 70 percent, and you can turn emphasis off for words of three letters or fewer.
Does the copied text keep its bold formatting?
Yes. Copy formatted text places a rich-text version on your clipboard, so pasting into a document that accepts formatting keeps the bold leads. A plain-text version is included as a fallback for places that only take unformatted text.
Does it work on long passages?
Yes. The preview updates as you type and handles long text, with the preview panel scrolling instead of stretching the page. Processing happens in your browser, so length is bounded by your device rather than an upload cap.
Is my text uploaded anywhere?
No. Everything runs in your browser and the text never leaves your device, which matters when it is a private document or an unpublished draft.

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