Alt text for LinkedIn: the B2B angle most marketers miss

LinkedIn feels like the buttoned-up platform — the one where everyone already has their act together. That reputation quietly convinces a lot of B2B marketers that accessibility is someone else's job here, or already handled. It isn't. Alt text on LinkedIn is opt-in, exactly like everywhere else, and most images posted to company pages and personal profiles still ship without it.

The platform also has a quirk worth knowing before you write a single word: its alt text field is shorter than most.

Where the field is, and its tighter limit

On desktop, upload an image to a post and click Alt.text just below the thumbnail — a box opens for your description, then Save. On mobile, the same option appears as a small ALT tag under the image. Either way, LinkedIn caps you at 120 characters, a handful fewer than the roughly 125-character ceiling most other platforms and screen readers work with.

Those five or so characters matter more than they sound like they should, because B2B images tend to be information-dense — a screenshot, a slide, a chart — and cramming the point into 120 characters takes more editing, not less.

Why B2B images need this more, not less

Consumer feeds run on lifestyle photos where a general description is usually enough. LinkedIn runs on product screenshots, event photos, testimonial graphics, and chart-heavy update posts — images where the whole point is a specific fact or number. Skip the alt text on a slide announcing a partnership or a chart showing pipeline growth, and a screen reader user gets nothing about the one thing that post existed to say.

The weak version is the caption, not a description — it tells a screen reader nothing that isn't already in the post text above it. The strong version gives the one fact the graphic exists to communicate, in about the space LinkedIn actually gives you.

Don't rely on LinkedIn's fallback

LinkedIn will auto-generate alt text for images you leave blank, the same way Instagram does. It's a reasonable safety net for a photo, but for a slide or chart it tends to describe shapes and colors instead of the number or claim that matters — which is precisely the part a B2B post can't afford to lose.

Make it part of publishing, not an afterthought

The honest reason this gets skipped on LinkedIn is the same reason it gets skipped anywhere: writing a tight, accurate description takes a few extra seconds right as you're about to hit Post, and that's exactly the moment nobody wants to spend them. Treating alt text as a fixed step in your publishing checklist — right after the caption, before you click Post — is enough to fix it for good.