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Bionic Reading

Apply "bionic reading" to text: bold the first part of each word to help your brain read faster. Configure the highlighted percentage. Everything in your browser.

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Bold percentage (%) 50%

Preview

Ready-made HTML

Read faster with bionic reading

The bionic reading technique starts from a curious idea. By bolding only the start of each word, the brain completes the rest on its own and the eyes run faster along the line. This tool applies that highlight automatically to any text you paste.

You set the percentage of each word that gets bolded, calibrating the effect to your taste and the kind of reading. Many people report more focus and speed, especially with long or dense text. The effect varies from person to person, so it's worth testing to see whether it works for you.

Since all processing happens in the browser, the text never leaves your computer. Paste the content, adjust the highlight and read right there. The copy button hands you the HTML with the bold tags in it, ready for anywhere that renders markup — in a plain text field the tags would show up raw.

Frequently asked questions

How many letters of each word end up bold?

The count is the word's length times the percentage, rounded up, and never fewer than one letter. At the default of 50%, a nine-letter word gets five bold characters and a two-letter word gets one. The slider runs from 20% to 80%. At the bottom of the range short words still get one bold letter; at the top, two- and three-letter words come out fully bold, which cancels the effect on exactly the words that needed it least.

I copied the result and the bold disappeared where I pasted it

The Copy button takes the HTML from the lower box, not the formatted text. Anywhere that accepts plain text only, such as WhatsApp, a search field or a notes app, you will see the markup spelled out instead of the effect. That code is meant for a blog post, a web page or an email in source mode. To carry the bold into Word or Google Docs, select the text inside the preview with the mouse and copy from there, since rich formatting survives that route.

Does punctuation count toward the bold part?

It does. Words are split on whitespace, so anything glued to a word counts as part of it: a nine-letter word followed by a comma is measured as ten characters, with the comma weighing on the calculation. If a word opens with a quote mark or a bracket, that symbol takes the first slot and comes out bold. Hyphenated words follow the same rule, so well-known counts as one ten-character word. Line breaks in the source are preserved in the preview.

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