AI Posts & Alt Text for X
Upload a photo, get a concise post and descriptive alt text for X (formerly Twitter)
PhotoScanr writes 280-character posts and 1,000-character alt text descriptions so every image you share is engaging and accessible
Posts Under 280 Characters
AI writes concise, engaging posts that fit within the character limit. Every word matters in 280 characters, so the AI focuses on impact over filler.
Alt Text Up to 1,000 Characters
X supports alt text on images for screen reader users. PhotoScanr generates detailed, plain-language descriptions that make your photos accessible to visually impaired followers.
Minimal Hashtags
On X, 1-2 relevant hashtags perform best. More than that can look spammy and reduce engagement. PhotoScanr suggests only the most relevant tags for your specific image.
Thread-Ready
Sharing multiple photos? Upload a batch and get individual posts for each image, ready to compose into a thread with unique commentary per photo.
Batch Processing
Upload multiple images and get posts and alt text for each. Useful for photo threads, event coverage, or preparing a queue of scheduled posts.
Separate Copy Buttons
Copy the post text and alt text separately. The post goes in the compose box. The alt text goes in the image description field (the "Add description" option after attaching an image).
Why Alt Text Matters on X
Accessibility Is Not Optional
Millions of people use screen readers to navigate social media. When you post a photo without alt text, screen readers announce it as "image" with no further context. Your followers who are blind or have low vision miss the entire point of your post.
X supports up to 1,000 characters of alt text per image. PhotoScanr writes detailed, objective descriptions of what's in the photo so screen reader users get the same information as sighted users.
Good Alt Text Is Hard to Write Quickly
Writing alt text well requires you to describe what's visually apparent without being overly wordy or subjective. "A beautiful sunset" doesn't help a screen reader user. "Orange and pink sunset over a calm lake with pine trees silhouetted along the shoreline" does.
Most people skip alt text because it takes effort after they've already written the post. PhotoScanr generates it automatically, removing the friction.
280 Characters Forces Precision
The character limit on X means you can't hide behind long paragraphs. Every word needs to earn its place. A photo post needs text that complements the image without restating what's already visible.
PhotoScanr's AI writes posts that add context, tell a story, or prompt engagement rather than just describing what the viewer can already see in the photo.
Photo Posts Get More Engagement
Posts with images consistently outperform text-only posts on X in terms of retweets, likes, and replies. But engagement drops if the post text is generic ("Check this out!") or absent.
The combination of a strong image, a concise contextual post, and proper alt text gives you the best chance of reach. PhotoScanr generates all three from a single photo upload.
Tips for Photo Posts on X
Always Add Alt Text
After attaching an image, click "Add description" (or the "+ALT" button) to add alt text. Describe what's in the image objectively: subjects, setting, actions, text visible in the image. Don't include opinions or hashtags in alt text. X allows up to 1,000 characters.
Use 1-2 Hashtags Maximum
Research consistently shows that posts with 1-2 hashtags outperform those with more on X. Too many hashtags make a post look like spam and reduce replies. Choose the single most relevant hashtag for your content. If you add a second, make it specific to your niche rather than broad.
Use 16:9 Landscape for Single Images
X displays single images at a 16:9 crop in the timeline (1200x675 pixels). If your image isn't 16:9, X will crop it automatically, and the crop might cut off important parts of your photo. For multiple images in a single post, X uses various grid layouts depending on how many images you attach.
Add Context the Image Can't Show
Don't just describe your photo in the post text. Viewers can see it. Instead, add context: when/where it was taken, the backstory, what happened next, why it matters, or ask a question. The post text should complement the image, not duplicate it.
Consider Threads for Photo Series
If you have multiple related photos (event coverage, a trip, a project), a thread works better than cramming 4 images into one post. Each reply in the thread can have its own image, alt text, and commentary. PhotoScanr's batch mode generates unique content for each photo, making thread creation faster.
How It Works
Upload Your Photo
Drag and drop or browse to select your image. Works with JPG, PNG, WebP, and HEIC files.
AI Analyzes Your Image
Google Gemini AI identifies subjects, scene, mood, and context, then writes a concise post and a detailed accessibility description.
Get Post Text and Alt Text
Receive a 280-character post with 1-2 hashtags, plus a separate alt text description up to 1,000 characters for the image description field.
Copy, Attach, and Post
Copy the post text into the compose box. Attach your image, click "Add description," and paste the alt text. Post.
Frequently Asked Questions
What is alt text on X?
Alt text (alternative text) is a description of an image that screen readers read aloud to visually impaired users. On X, you can add alt text to any image by clicking "Add description" or the "+ALT" button after attaching the image. X allows up to 1,000 characters. Good alt text describes the visual content objectively: subjects, actions, setting, and any visible text.
How many hashtags should I use on X?
Research and best practice suggest 1-2 hashtags. Posts with more than 2 hashtags see declining engagement on X. This is the opposite of platforms like Flickr where more tags help. On X, choose the single most relevant hashtag for your post. If a second one adds genuine value, include it. Otherwise, skip it.
What image dimensions work best on X?
For a single image, X displays it at 16:9 in the timeline (1200x675 pixels). For two images, the layout is two vertical rectangles side by side. For three, one large vertical plus two smaller ones. For four, a 2x2 grid. If your image isn't one of these ratios, X crops it automatically. You can adjust the crop point on mobile before posting.
Does alt text affect post reach on X?
There's no confirmed ranking boost from alt text on X. However, posts with alt text are accessible to a wider audience, which can increase engagement from users who rely on screen readers. Some users specifically filter for and amplify content with alt text. The primary reason to add it is accessibility, not algorithm optimization.
Try It Free
Upload a photo and get a post with alt text for X in seconds. No signup required.
Generate Post & Alt Text →5 free analyses per day • No account needed • Results in seconds
Concise, impactful posts
Detailed accessibility descriptions
Your photos are never saved on our servers
X (formerly Twitter) is a trademark of X Corp. PhotoScanr is not affiliated with, endorsed by, or sponsored by X Corp. PhotoScanr generates content for use on X and other platforms.