Instagram Alt Text: How to Write It and Why It Helps

Instagram alt text is a short written description of an image that sits behind the scenes of your post. People who use screen readers hear it read aloud, and it can also help Instagram understand what a picture shows. Most accounts never touch it, which means a small amount of effort can set your posts apart.

This guide explains where to find the alt text field, how to write good descriptions and what to avoid. It also includes a hypothetical worked example. We make no promises about reach or growth, because nobody can. The main reason to write alt text is that it makes your content usable for more people.

What alt text is and who it is for

Alt text, short for alternative text, is a written version of what is in an image. It is not a caption. A caption speaks to everyone who sees your post. Alt text speaks mainly to people who cannot see the image clearly, including people who are blind or have low vision and who use a screen reader.

It also helps in less obvious situations. If an image fails to load on a slow connection, alt text may be what appears instead. If someone is learning your language, a plain description can support understanding.

Instagram has said that captions, keywords, alt text and the words spoken or shown in a video can help it understand what a post is about. We cannot say how strongly alt text is weighted, and it is not a ranking trick. Think of it as good manners that may also give the app a little more context.

Where to find the alt text field

The menu names and layout change from time to time, so look carefully in the app rather than relying on screenshots in old guides. In general, the process looks like this:

1. Start a new post and choose your photo or photos.
2. Move through the screens until you reach the final one, where you add your caption.
3. Look for an option for advanced settings or accessibility.
4. Choose the option to write alt text.
5. Type a description for each image.
6. Share the post as normal.

You can often add or edit alt text after posting, too. If you cannot find it, search the Instagram Help Center for "alt text" to see the current steps for your device.

How to write Instagram alt text that works

Good alt text is short, clear and factual. Imagine you are describing the picture to a friend over the phone. These habits help:

• Say what matters. Start with the main subject and the action or setting.
• Be specific. "A woman kneading dough on a floured wooden table" is more useful than "baking".
• Keep it brief. One or two sentences is usually enough.
• Include visible text. If the image shows words, such as a sign or a quote, write them out.
• Skip the phrase "image of". The screen reader already announces that it is an image.
• Use normal sentences. Write with capital letters and full stops so it reads naturally aloud.

You do not need to describe every pixel. Describe what a person needs to understand the point of the post.

Using keywords without stuffing

It is fine to include a natural keyword in alt text if it truly describes the image. If you post a photo of a handmade ceramic mug, the words "handmade ceramic mug" belong there because that is what is in the picture.

Do not fill the field with a list of search terms. Something like "mug cup coffee tea gift cheap best mug buy" is useless to a screen reader user and looks like spam. Alt text must describe the image first. A keyword is only a bonus when it fits.

If you are working out which phrases suit your niche, the free tag generator can give you ideas. It works in your browser and does not know live search volume, so use it as a prompt for ideas, not as evidence of demand.

Alt text for different kinds of posts

Single photos. Describe the subject, setting and anything important about mood or action.

Carousels. Each slide can have its own alt text. Write a separate description for every image, not the same line repeated. Our guide to Instagram carousel captions covers how captions and slides work together.

Graphics with text. If a slide is mostly words, copy the main words into the alt text. A screen reader cannot read text that is baked into an image.

Reels and video. Alt text options for video may differ from those for photos. Spoken words and on-screen text matter here, and captions or subtitles help many viewers. Check the app to see what is available to you.

Decorative images. If an image adds nothing, such as a plain background, keep the description very short or follow the app's guidance.

Worked example: a hypothetical bakery post

This is a made-up illustration, not a real account and not a real result. Imagine a small home bakery posting a carousel of three images about a new sourdough loaf.

Slide 1. A close-up of a round sourdough loaf with a golden crust cooling on a wire rack. Slide 2. A hand holding a sliced piece of bread to show the open crumb. Slide 3. A chalkboard price list with the words "Sourdough £5, Rye £6".

Steps to write the alt text.

1. Look at each slide separately and ask what it shows.
2. Write one plain sentence for each.
3. Copy any visible words exactly.
4. Read the three lines aloud to check they sound natural.

Resulting alt text.

• Slide 1: "A round sourdough loaf with a golden crust cooling on a wire rack."
• Slide 2: "A hand holding a slice of sourdough bread with a soft, open texture."
• Slide 3: "A chalkboard price list reading: Sourdough £5, Rye £6."

Summary of the hypothetical example: each slide has its own short, factual description, the price text is written out, and no keyword list is added. Any effect on reach or followers is unknown and would be for the baker to check in Insights.

Common alt text mistakes

• Leaving it blank. Without alt text, screen reader users get little or nothing from your image.
• Repeating the caption. Alt text should describe the picture, not copy your caption word for word.
• Stuffing keywords or hashtags. It makes the description unreadable.
• Writing very long paragraphs. Long text is tiring to listen to.
• Guessing details. Do not state names, feelings or facts you cannot see or are not sure about.
• Describing only the obvious. If a slide contains words or a key detail, include it.

Accessibility is a wider topic than alt text alone. Our article on social media accessibility basics covers captions, readable hashtags and more.

Frequently asked questions

Does alt text make my post rank higher?

We cannot say that, and no one outside the company can promise it. Instagram has said alt text is one of several signals that can help it understand a post. Treat it as helpful context and an accessibility step, not a ranking trick.

Do I need alt text on every post?

It is a good habit, and it matters most for images where the meaning is not obvious from the caption. If time is short, start with your most important posts and posts with text in the image. Over time you can make it part of your normal routine.

How long should alt text be?

Aim for one or two short sentences. Include the main subject, the setting and any visible words. If you need much more than that, the detail may belong in your caption instead. Check the app for any current length limits.

Conclusion

Instagram alt text is a small task with a clear benefit: it makes your images understandable to people who cannot see them, and it gives the app a little extra context. Write short, factual descriptions, include visible words and keep keywords natural.

Your next step is to open your latest post, find the alt text field and add a one-sentence description to each image. Check Instagram's official Help Center for current steps, because menus and features change.

Official sources

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

• Instagram Help Center
• W3C Web Accessibility Initiative