Social Media Accessibility Basics: Captions, Alt Text and Readable Hashtags

Social media accessibility basics are the small habits that let more people read, hear and understand your posts. That includes people who are blind, deaf, colour blind or easily tired by dense text, and also anyone watching with the sound off on a busy train.

If your question is a little different, these guides cover it: TikTok Captions and On-Screen Text for Viewers Without Sound.

You do not need special tools or expert training to start. A few changes to how you caption, describe and format your posts can make a real difference, and many of them take less than a minute per post.

Why accessibility is worth your time

Accessibility is first of all about fairness. If a video has no captions, a deaf viewer cannot follow it. If an image has no description, a person using a screen reader may hear only the word "image".

It can also be practical. Many people watch with the sound off, read in bright sunlight or scroll quickly. Clear captions, readable text and simple formatting help all of them, not only people with a disability.

We make no promise that accessible posts will earn more reach. The reason to do it is that your content becomes usable by more people. Any benefit beyond that is a bonus.

Social media accessibility basics: the four-part checklist

It helps to keep the habits short enough to remember. Here is a checklist you can run before you post.

1. Captions for anything with speech.
2. Alt text for images that carry meaning.
3. Readable text in your caption, with hashtags formatted clearly.
4. Contrast and pace in anything you design or edit.

The sections below take each one in turn. You can adopt them one at a time rather than all at once.

Captions on video

Captions turn spoken words into text on the screen. They help deaf and hard of hearing viewers, people in noisy places and people who simply prefer to read. Many apps offer automatic captions, and some also let you type or edit them yourself.

Automatic captions are a good start, but they can make mistakes. Names, slang and technical words are common trouble spots. Read through them before you publish and fix anything that changes the meaning.

A few simple tips make captions easier to follow.

• Keep each line short so it can be read in one glance.
• Place captions away from the edges and from buttons that the app may cover.
• Use a plain, high-contrast style rather than a decorative font.
• Include important sounds in words if they matter, for example "[door slams]".

The way each app handles captions changes over time, so look in the app's settings or Help Center for the current options. For ideas on the written caption underneath your video, see our guide to TikTok caption writing tips.

Alt text for images

Alt text is a short written description of an image. A screen reader reads it aloud for people who cannot see the picture. Some platforms also use it to understand what a post is about, although you should not rely on that.

Good alt text is clear and specific. Describe what matters in the image, in a sentence or two, as you would to a friend on the phone. Skip phrases like "image of" because the screen reader already announces that it is an image.

Compare these two.

• Weak: "Cake".
• Better: "A round lemon cake with white icing and three thin lemon slices on top, on a blue plate."

If the image contains text, include that text in the description. If the image is purely decorative, a short description is fine. Do not stuff alt text with hashtags or keywords, because that makes it unpleasant to listen to. Our full guide to Instagram alt text goes deeper into how to write it and where the setting lives, and menu names may change, so check the app.

Readable hashtags

Hashtags can be hard for screen readers and for people with reading differences. A long string of lowercase letters, such as a phrase with no gaps, may be read as nonsense. The easy fix is to capitalise the first letter of each word.

• Harder to read: #homebakingtips
• Easier to read: #HomeBakingTips

Capitals do not change how the hashtag works in most cases, but they make it clearer to the eye and to many screen readers. Check the platform's behaviour if it matters to you.

Other habits help as well.

• Put hashtags at the end of the caption, not in the middle of sentences, unless a word is part of the sentence.
• Use only a handful. As of this writing, Instagram's Help Center says up to 5 hashtags on a post, and limits can change, so confirm in the Help Center.
• Avoid long runs of unrelated tags. They are noisy to read aloud and look spammy.
• Skip emojis inside hashtags and in the middle of words, because screen readers may read out their full names.

The free tag generator can suggest topic phrases, and you can then capitalise each word before you paste them into your post.

Text, colour and contrast

Many accessibility problems are visual. Light grey text on a white background is hard for many people to read, and pale text over a busy photo is worse. Pick dark text on a light background or the reverse, and test it with the brightness turned down.

Do not use colour alone to carry meaning. If a chart uses red and green lines, add labels or different line styles so colour blind viewers can tell them apart.

Avoid fast flashing and strobing effects. They can be uncomfortable and, for some people with certain conditions, unsafe. When in doubt, slow the effect down or leave it out.

For slides and carousels, keep text large and short, with one idea per slide. Give people time to read, particularly in video where text appears and disappears.

Worked example: a hypothetical craft account

This is a made-up illustration, not a real case, and it makes no claim about results.

Imagine a small account that shares paper craft videos. Before posting a new tutorial, the creator runs through the four-part checklist.

1. Captions: the creator turns on automatic captions, then reads them and fixes the word "decoupage", which was misheard.
2. Alt text: for the cover photo, the creator writes "A hand holding a small greeting card with a pressed blue flower glued to the front, on a wooden desk."
3. Hashtags: the creator picks four tags and capitalises each word, for example #PaperCraft and #CardMaking, and places them at the end of the caption.
4. Contrast: the creator changes pale yellow on-screen text to white with a dark outline so it stays readable over the busy background.

Summary: four quick checks, a few minutes in total, and the same post becomes easier to follow for people with different needs and settings.

Frequently asked questions

Do I have to add captions to every video?

It is a good habit, and it helps a lot of viewers, including people who watch with the sound off. If time is short, start with videos where someone speaks, then add captions to older popular posts when you can.

Is automatic alt text good enough?

Some apps suggest a description automatically, but it may be vague or wrong. A short description you write yourself is usually clearer. Treat any automatic suggestion as a starting point and edit it.

Will accessible posts perform better?

We cannot promise that. Accessibility makes your content usable for more people, and that is the main reason to do it. Any effect on views is uncertain, so measure with your own analytics if you are curious.

Conclusion

Accessibility is a set of small, repeatable habits rather than a big project. Choose one to begin with, such as capitalising the words in your hashtags or checking automatic captions, and apply it to your next three posts. Add the next habit once the first feels natural.

Official sources

Platform features and rules change. For the current wording, check the official help pages:

• Instagram Help Center
• TikTok Support
• YouTube Help
• W3C Web Accessibility Initiative