# How to add or edit alt text on TikTok photo posts

By HeyMark · Updated October 22, 2026

Alt text gives people using screen readers more context about your photos. On TikTok, you can add it while posting or edit it later; here are both paths and the 300-character limit for each photo.

## Add alt text before you post

Prepare your photo or multi-photo post in the TikTok app. Describe the context each image needs; you can add a separate description next to each photo.

1. Upload or create a photo and tap **Next**.
2. On the post screen, tap **More options**.
3. Tap **Add alternative text**.
4. Enter a description next to each photo that needs context. Each one can be up to 300 characters.
5. Tap **Done** at the top.

Continue with your post. TikTok says screen readers can read this text to help people with visual impairments better understand the photos.

## Edit alt text on a photo you posted

1. Go to your profile and open the photo post you want to update.
2. Tap **More options** on the side.
3. Tap **Edit post**.
4. Open **Add alternative text** and edit the description next to the relevant photo.
5. Tap **Done**.

To check the saved text, open **Edit post → Add alternative text** again and review each photo’s description. If the option is missing, make sure you opened a photo post and check the TikTok help linked below.

Use alt text to describe an image for screen readers. A post caption is the written text accompanying the post, and video captions transcribe its audio. See [how to add or edit TikTok captions](https://heymark.ai/en/solutions/add-edit-tiktok-captions/) if you want to correct a video transcript.

See [TikTok’s help on alternative text for photos](https://www.tiktok.com/support/faq_detail?id=7581826684102679052&lang=en) for the documented steps and limits.

## See it on your own accounts.

Connect Instagram, TikTok, Facebook, LinkedIn or YouTube and use HeyMark free for 7 days. Mark answers in your voice, and you approve what goes out.

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## Keep reading

- [Add and edit subtitles on TikTok](https://heymark.ai/en/solutions/add-edit-tiktok-captions/): Edit auto-generated captions on published videos and review creator captions before posting. Check each line against the audio, then save your changes.

## Developer and agent resources

- [HeyMark MCP documentation](https://heymark.ai/en/mcp/)
- [llms.txt](https://heymark.ai/llms.txt)
- [Full site content for language models](https://heymark.ai/llms-full.txt)
- MCP protocol endpoint: `POST https://mcp.heymark.ai`
- OAuth protected-resource metadata: [/.well-known/oauth-protected-resource](https://mcp.heymark.ai/.well-known/oauth-protected-resource)
- MCP server card: [/server-card](https://mcp.heymark.ai/server-card)