PostEaseGuidesPublished Updated
Adding alt text to the images you schedule
One composer field, sent with the image to Instagram, X, LinkedIn, Pinterest and Bluesky. Why the cap is 500 characters, and why video is left out.
where this happens in the app
Caption
Three blues, one kiln. Left to right: cobalt over white, a celadon that went greener than planned, and the one I will make again. Which would you pick?
- Instagram · Carousel, 4 photosTue 18:00
- TikTok · Photo postTue 18:00
- YouTube · Short, with coverTue 18:30
- LinkedIn · Morning slotWed 08:30
- X · Shortened to 280Tue 18:00
- Bluesky · Shortened to 300Tue 18:00
1. What alt text is for
A short description of what the image shows, read aloud by screen readers and shown when an image fails to load. Describe what matters in the picture, not that it is a picture.
2. Where the field is
Attach an image in the composer and an Alt text field appears under it. One description per post; it goes with the image to every channel you select that accepts it.
3. Which platforms receive it
Instagram, X, LinkedIn, Pinterest, and Bluesky, each through its own API field. YouTube and WordPress do not take alt text through the APIs this product uses, so the field has no effect there.
4. Why the limit is 500 characters
Pinterest caps alt text at 500 characters, the tightest of the five. One rule everywhere means a description you write once fits everywhere it is sent.
5. Video is left out
None of these APIs accepts alt text on a video upload, so the description is not sent with one. Put the essential context in the caption instead.
Questions
Which platforms receive alt text from PostEase?
Instagram, X, LinkedIn, Pinterest and Bluesky, each through its own API field. YouTube and WordPress do not take alt text through the APIs PostEase uses.
How long can alt text be?
500 characters. That is Pinterest’s cap and the tightest of the five, so one description you write once fits everywhere it is sent.
Can I add alt text to a video?
No. None of these platforms’ APIs accepts alt text on a video upload, so the description is not sent with one. Put the essential context in the caption.
Keep reading
- Saving a draft vs. scheduling a post
A draft needs a caption and a channel. Scheduling adds one rule: the time has to be at least five minutes from now.
- Can I navigate away while a video is uploading?
Yes. The upload keeps going in the background, with its progress in the sidebar on every screen, and a failure stays in the bell until you read it.
- How to schedule YouTube videos in advance
Connect a channel once, pick a time with its own timezone, and the video uploads then. Making it Public is still a manual step in YouTube Studio today.
- How to bulk-schedule a month of posts from a CSV
On the Pro plan: four columns, up to two hundred rows, and one error message per bad line. A whole file is never rejected for one typo.
- Social media accessibility: alt text, captions and more
Describe it once. Every channel gets it.
Every channel you have, included. Adding another does not change the price.