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How to add alt text on social media
Where the alt text field is on Bluesky, Mastodon, X, LinkedIn, Instagram and Facebook, with the current steps for web and app, checked October 2026.
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Notes on alt text and accessible images.
Guides to writing alt text and making the images you publish accessible, from social media posts to photos, charts and screenshots.
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Alt text character limits on every platform (2026)
The alt text character limits for Bluesky, X, Mastodon, LinkedIn, Instagram and Facebook as of October 2026, each checked against an official source.
How long should alt text be?
There is no screen reader cut-off at 125 characters. How long alt text should be in practice, with examples of short, medium and long descriptions.
How to write alt text for screenshots
How to write alt text for screenshots of posts, messages, apps and articles: what to transcribe, what to leave out and what to do when the text is long.
How to write alt text for charts and graphs
A simple pattern for chart alt text: type, subject and the takeaway. Examples for bar, line and pie charts, maps and infographics, and when to add the data.
Alt text vs captions vs image descriptions
Alt text, captions and image descriptions do different jobs. What each one is, who sees it on the web and on social media, and how to use them together.
How to Make Social Media Posts Accessible with Effective Alt Text
Learn how to write effective alt text for Bluesky, LinkedIn, and Instagram. Practical best practices for making your social posts accessible to everyone.
Why Alt Text Matters: A Practical Guide to Accessible Images
Why alt text matters for screen reader users, accessibility law and search, with practical tips and examples for describing the images you publish.
