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Gixo Lumen · free accessibility tool

Slide Legibility Checker

Test whether the smallest text on a projected slide will subtend enough visual angle for the furthest viewer. The result is one measurable number: arcminutes.

No account. Nothing stored. Trigonometry only — no AI model call.

Describe the room and slide

Use the smallest important text on the slide, the image height on the wall, and the distance to the furthest viewer.

Assumptions: 16:9 PowerPoint uses a 540-point design height; visible capital height is estimated at 70% of nominal font size.

Check the whole deck before delivery

The calculator stays free. Gixo Lumen builds and exports editable decks with consistent layouts and reusable themes.

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