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How to Design Readable Conference Slides
Make the idea easy to see. Design for the person at the back of the room.
Your audience should spend its attention on the idea you are explaining. Give them a slide they can understand while you help them interpret it.
Start with the room, the people in it, and the job each slide needs to do. Then choose the colors, type, and layout.
The quick answer
Readable conference slides use strong contrast, large type, clear visual hierarchy, and relevant evidence. A soft light background with dark text is a useful starting point. Check the venue’s screen and lighting, simplify screenshots and charts, describe important visuals aloud, and share accessible materials.
Are light backgrounds better for presentation slides?
For a new speaker, we recommend starting with a soft off-white background and dark text. Keep the background simple and use an accent color to identify what matters. This is our design default, subject to the actual room and display.
Microsoft’s guidance for dyslexia recommends considering off-white or cream to reduce problems associated with bright white backgrounds. It also allows dark backgrounds with light text. This is accessibility guidance, not a controlled comparison of conference keynotes. Microsoft: Design slides for people with dyslexia.
A dark slide may suit a photograph, a visualization, or a dim venue. Preserve readable labels and check the result with the production team. Avoid switching repeatedly between very bright and very dark slides without a reason.
What does the research say about dark text on light backgrounds?
Buchner and Baumgartner found better proofreading performance with dark text on light backgrounds across their tested lighting and color conditions. Those were display-reading experiments, not tests of a keynote audience. Buchner and Baumgartner, 2007.
A later experiment by Buchner, Mayr, and Brandt found that the polarity advantage disappeared when overall display luminance was matched. Higher luminance helped in the tested conditions. The finding argues against treating background color alone as the cause. Buchner, Mayr, and Brandt, 2009.
Our application: choose a legible starting design, then test it where it will be seen. Screen technology, room lighting, viewing distance, and individual needs all belong in that check.
What font size should I use on conference slides?
As an editorial starting point for a widescreen deck, try body text around 28–32 points and headings around 40–48 points. Increase them when the room requires it. These ranges are drafting aids, not accessibility certification or universal conference standards.
Microsoft advises avoiding type smaller than 18 points and notes that large rooms may require larger text. The TEDx Speaker Guide recommends 42 points or larger for its context. These different recommendations reinforce the need to test your actual presentation. Microsoft: Creating and delivering an effective presentation; TEDx Speaker Guide.
Include chart labels, code, captions, and source notes in the readability check. If something is essential and only readable on your laptop, enlarge it or redesign that part of the slide. Use a short citation on screen and put the full reference in the shared materials.
From the All Things AI archives
Design for the room
A clear slide supports the explanation from the front row to the back. Make the point easy to see and worth remembering.
How much contrast should slide text have?
WCAG 2.2 specifies at least 4.5:1 for ordinary web text and 3:1 for qualifying large text. These are web accessibility thresholds. They are useful design checks, but do not establish that a projected slide will be readable from every seat. W3C: WCAG 2.2 Contrast (Minimum).
Our practical target is at least 4.5:1 for essential slide text, including labels, followed by a room test. Avoid pale gray labels and thin type. If your chart uses orange and blue, also use direct labels or different markers so color is not the only cue.
Keep a consistent meaning for each visual treatment. If orange identifies the proposed step, use it for that purpose throughout the sequence. Decoration should not compete with the evidence.
How should I show charts, screenshots, and code?
Choose the view that supports the point you are explaining. For a chart, write the takeaway in the heading, label the axes and units, and show the comparison and source. Preserve the scale and context needed to interpret the result honestly.
For a screenshot, crop to the relevant area, remove sensitive information, and annotate the control or result you want people to notice. If the full interface matters, show an overview first and then a readable close-up.
For code, show the smallest complete excerpt needed to explain the decision. Give people a way to find the full example afterward. Test syntax colors against the actual background and read the important line aloud.
If a complicated chart requires a minute of explanation, give it that time. Simplification should help the audience evaluate the information.
What else makes a slide deck accessible?
W3C recommends providing accessible materials in advance when needed, describing relevant visual information aloud, and making audio content available through captions or text. W3C: Making Events Accessible.
- Give each slide a meaningful title and check the reading order in the file you will share.
- Write useful alternative text for meaningful images in the distributed deck.
- Run the accessibility checker in your slide software and inspect the exported file as well.
- Use descriptive link text and provide a readable short URL alongside any QR code.
- Make the central explanation available in notes or a handout so a screenshot of the stage is not the only record.
Ask the organizer about the format, captions, interpreters, and accessible-materials process early enough to prepare the right version.
Research and sources
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