Memes on X: Image Sizes, Alt Text and Accessibility

Most of what makes a meme work on X happens before you post it: the shape of the image, how big the text is and whether you've written a description. This guide covers the sizes that survive the timeline, how to write alt text that keeps the joke intact, and a few accessibility habits that make your memes readable for more people.

Memetastic is an independent site and isn't affiliated with X Corp. Platforms change their layouts and limits from time to time, so if something below doesn't match what you see, check X's own help center.

Sizes that show uncropped

For a single image, a 16:9 landscape image is the safest shape. 1600 by 900 pixels is the size most guides recommend, and it's the default in the Memetastic maker. At that ratio the whole picture usually shows in the timeline without being cropped.

Tall images are the ones most likely to be trimmed in the preview. If your punchline sits at the very bottom of a tall meme, people may not see it until they tap. Either keep important text away from the top and bottom edges or stick with landscape.

Multi-image posts crop harder

X lets you attach up to four images to a post. When you do, each preview becomes a smaller tile, and the tiles are cropped to fit a grid. A four-image post shows each picture at about a quarter of the space.

If you're telling a story across several images, consider building it as one image instead, using the two-panel or four-panel layout. One image keeps all the text at a size people can read, and nothing is cropped in a way you didn't choose.

Keep files light

PNG keeps outlined text sharp, which is why it's the default download. A PNG of a large photo can get heavy, and very large files may be compressed hard or rejected. If that happens, download the JPG version instead. X compresses uploads anyway, so the difference in quality is usually small.

Don't screenshot your meme to share it, and don't download it from X to repost it. Each round of compression adds blur around the letters.

Alt text: why it matters for memes

Alt text, which X calls an image description, is read aloud by screen readers. People who are blind or have low vision use it, and so do people on slow connections when images don't load. A meme without alt text is, for them, an empty post.

Memes are a special case because the important text is part of the picture. A screen reader can't read words baked into an image. If you skip the description, the joke is invisible.

To add one, look for the "+ALT" badge on the image in the X apps, or "Add description" under the image on the web. X's help center says descriptions can be up to 1,000 characters.

How to write alt text for a meme

A simple pattern works for nearly every meme:

1. What the picture shows, briefly, focusing on whatever makes the joke work.
2. The text on the image, word for word.
3. The format, if knowing it helps, like "two-panel comparison".

Examples, using made-up memes:

Two stacked panels. Top: a cat glaring at a bowl of expensive cat food, labeled "the food I bought". Bottom: the same cat happily sitting in the cardboard box it came in, labeled "the box".

A plain pink background with bold white text: "Me at 9 a.m.: today I will be productive. Me at 9:05: researching the history of spoons."

Some tips:

• Don't start with "Image of" or "Picture of". Screen readers already announce that it's an image.
• Write the caption the way it reads, not in all caps. Some screen readers spell out all-caps words letter by letter.
• Describe expressions when they carry the joke, such as "looking smug" or "visibly panicking".
• Keep it short. Most memes need one to three sentences.

Contrast and text size

Outlined white text with a thick black edge reads on almost any background, which is why it became the meme default. When you change colors, check the contrast. Light gray text on a pastel gradient may look stylish and be unreadable for many people, including anyone reading in sunlight.

Keep text large. Many people browse with their phone at arm's length or with older eyes. If you can't read your meme comfortably at thumbnail size, cut words and make the letters bigger. Our guide on making memes that read at a glance has more on this.

Animated memes and flashing

Animated GIF-style memes need a little extra care. Rapid flashing, especially bright red flashes or flashes more than about three times a second, can trigger seizures in people with photosensitive epilepsy, and fast strobing is unpleasant for many others. Avoid strobe effects, keep color changes gentle and don't loop a flash. Our GIF meme guide covers frame timing in more detail.

Hashtags, emoji and the post text

Your post text matters for accessibility too. Screen readers read every emoji by its name, so a row of ten laughing faces becomes a long, repetitive announcement. One or two is plenty. For hashtags made of several words, capitalize each word, like #MondayMood rather than #mondaymood, so screen readers can pronounce them.

A pre-post checklist for X

• Landscape 16:9 unless you have a reason not to.
• Text away from the edges.
• One image instead of four when the story fits.
• Alt text with the full caption.
• No flashing.
• Light on emoji, hashtags in CamelCase.

Quick answers

Open the meme maker