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Bionic reading converter

Turn any text into bionic reading format, which bolds the first part of each word so your eye can move faster while the brain fills in the rest. Adjust the fixation strength, see a live styled preview, and copy a Markdown version to paste anywhere that supports bold.

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Bionic reading converter is free to use as often as you like, directly from this page. It sits under Transform & clean in our catalogue, alongside Reading speed (words per minute) calculator and Add line numbers.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Bionic reading converter?

Turn any text into bionic reading format, which bolds the first part of each word so your eye can move faster while the brain fills in the rest. Adjust the fixation strength, see a live styled preview, and copy a Markdown version to paste anywhere that supports bold.

What does a concrete case look like?

**Bio**nic **rea**ding — the opening of each word is bolded — the tool shows every step in between, not just the final figure.

When would I actually use this?

Cleaning up a paste before it goes anywhere: stripping duplicates from a list, normalising case, removing accents for a filename, or sorting lines.

What is the most common mistake?

Sorting text as if it were ASCII. Accented letters land after Z in a byte sort, which puts "Zurich" before "Émile" and produces a list no reader will accept.

How is Bionic reading converter different from Reading speed (words per minute) calculator?

They sit next to each other but answer different questions: Reading speed (words per minute) calculator is the one to open when you need it to measure your reading speed in words per minute from words read and time taken. Pick whichever matches what you're starting from — both are free.

Where do the figures come from?

Transformations use the browser's Unicode-aware string handling, so case changes and sorting respect the locale rather than byte order. Nothing is truncated: what comes out is the whole of what went in.

Further reading

All guides →
How-toNumbering the Lines of a Text for a Review with Several PeopleNumbering starts at 1 and cannot be set to 0, the alignment is spaces rather than zeros, and the remover undoes eight of the eleven separators without touching the indentation. What it still cannot do is tell your numbers from its own.ExplainerSentence Case and Title Case: The Rules Differ by LanguageEnglish title case has three different cutoffs depending on the style guide. French, Spanish, Portuguese and Italian have none at all. German capitalises every noun. The tool knows about none of this — here is exactly what it does.ExplainerRemoving Accents Breaks Search — Until You Do It on Both SidesFolding diacritics is a normalisation step, and normalisation only works when the same function runs on the index and on the query. NFC against NFD with the code points shown, and the letters — ø, ł, ß, œ, ı — that survive the strip untouched.ExplainerWhat Is a URL Slug? Why Lowercase, Hyphenated, and Good for SEOA URL slug is the readable, hyphenated part of a web address that names a page. Learn why slugs are lowercase, how they help SEO, and how to generate one from a title.ExplainerSorting Text Is Not One Operation: Four Orderings That All Call Themselves AlphabeticalCode-unit order, natural order and locale collation run on the same list in Node, with the outputs printed. Why Zebra beats apple, why item10 beats item9, and why ä sits next to a in German but after z in Swedish.ExplainerHow Fast Do You Read? Average Reading Speed and How to Measure ItMost adults read prose at about 200-250 words per minute. Learn what a normal reading speed is, how to measure yours in a minute, and why comprehension matters more than raw speed.