Dyslexia Font Converter

Reading Ruler

Paste your own text, then choose a line guide and optional screen tint. Everything runs in your browser.

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How to use the reading ruler ↓

Convert your text

Everything stays in your browser. Nothing is uploaded.

DOCX and copied text keep the font name. The computer that opens them needs the font installed. Download font

Font
Background
More settings
Follows your mouse. Click the preview, then use ↑ / ↓ keys.
Ruler and overlay

How to use the reading ruler

Paste or open your text in the tool above. Move the pointer over the preview, drag on a touch screen, or focus the preview and press ↑ / ↓. Choose a band one to four lines tall, an underline or a spotlight. Adjust the colour, dimming and overlay strength to your preference. Full-screen reading uses your browser’s full-screen mode; press Escape to exit.

Evidence for coloured overlays is limited and mixed; some readers simply prefer them. They are not a treatment for dyslexia. Griffiths et al. (2016), The effect of coloured overlays and lenses on reading: a systematic review of the literature, found no robust evidence supporting their use for reading difficulties.

Printable ruler guide

Print this guide, then cut a strip of card along the outline. Place it beneath a line of printed text and move it down as you read. Ask an adult for help with scissors when appropriate.

Reading guide — place below your line

Frequently asked questions

Can I use this on another website?

Paste text into this tool to use the ruler. It does not change other websites or apps.

Are my choices saved?

Display settings are saved in this browser. A saved ruler preference takes priority over this page’s starting layout.