Missing alt text is easy to overlook in Markdown because the source can still look complete. The image syntax is present, the file path is present, and the document may render with the screenshot visible. The missing part is the text inside the brackets.
Technical writers should catch that before publishing. Converty’s Markdown Validator can surface missing alt text along with other authoring warnings, so the issue is visible while the source is still easy to fix.
Why missing alt text hides in Markdown
Markdown image syntax looks like this:
When the description is missing, the image can still render:
That makes the issue easy to miss during a visual scan. The page may look fine to the author, but the source has lost useful context for readers who depend on text alternatives and for reviewers trying to understand the role of the image.
Check images during the preview pass
A practical docs workflow should include one image-focused review step:
- Paste the Markdown into the Markdown Validator.
- Review the rendered preview to confirm the image appears.
- Read the warning list for missing alt text.
- Return to the source and write a concise description that explains the image's purpose.
- Recheck the document before publishing or committing.
This is faster than waiting for a reviewer to catch the issue in a pull request or published page.
Good alt text depends on context
Alt text should describe why the image matters in the document. A screenshot of a CSV validator does not need every visible pixel described. It may need to say that the validator shows duplicate header warnings or a parsed preview of imported rows.
The best description depends on the surrounding text. If the paragraph already explains the image fully, the alt text can be brief. If the image carries new information, the alt text should help preserve that information.
Pair alt checks with broader Markdown QA
Missing alt text is one authoring issue among several. A good preview pass should also check heading structure, links, tables, and code fences.
For the broader workflow, read How to Catch Markdown Issues Before Publishing. For team review, use How Product and Docs Teams Can Review Markdown Without Losing Formatting.
Open the Markdown Validator before publishing Markdown when screenshots or diagrams are part of the document.
