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How to add alt text on Tumblr

Guides2/24/2026Bryam Loaiza
Tumblr add alt text UI

Three dots → Add Alt Text / Update Image Description

Tumblr supports long descriptions (around 4,096 characters) and lets you edit alt text later.

New posts

  1. Create a post and attach an image.
  2. Tap the three dots → Add Alt Text (mobile) or Update Image Description (web).
  3. Write your description and save.

Existing posts

  1. Open the post → Edit.
  2. Use the same menu to add or update the description.