Posting live from a conference: alt text when you have 40 photos and no time

The keynote just ended, your phone holds 40 photos, and the event hashtag is already moving. The fastest way through is to stop treating all 40 as posts. Choose the few you will actually share, then give each one a single plain sentence of image description: what is in the frame, and why someone scrolling past would care.

That is the whole method. The rest of this post is about doing it in seconds instead of minutes.

Cut the pile before you write anything

Most of those 40 are near-duplicates: the same stage from three angles, the same booth twice. Pick three to five that each show something different. You will write less, and your followers will see a feed that tells a story instead of a camera roll. If you do post a set as one swipeable post, the approach in alt text for carousels keeps each frame from repeating the last.

Use a one-line formula

Subject, what they are doing, where, and the one detail that matters. If you are stuck, ask what you would say to a colleague who could not see the photo. The W3C’s guidance on images puts the principle plainly: the right text depends on the usage, context, and content of the image, so a booth photo and a keynote photo get different sentences.

The weak line is a caption. It adds nothing a screen reader user could not already get from your post text. The strong one carries the slide’s title, which is the part that would otherwise be lost.

Photos of speakers and attendees need a little extra care: name the person if the program names them, and skip guesses about anyone else. Our guide to describing photos of people covers when appearance matters and when it does not.

Let the caption and the alt text do different jobs

Put the hashtag, the @-mentions, and the “so glad to be here” in the caption. Keep the alt text for what the image shows. WebAIM advises keeping alt text as succinct as accuracy allows, and not repeating what nearby text already says. It also recommends skipping “image of” or “photo of,” since screen readers already announce that it is an image. If you are unsure where the line sits, here is how alt text differs from captions. Aim for a sentence or two; the 125-character rule explains why shorter usually wins, and when to go longer.

Batch the writing in the gaps

Writing alt text with your thumbs between sessions is slow and error-prone. A better pattern is to shoot all day and describe in one sitting: sync the photos to your laptop at lunch or in the hotel, open the handful you chose, and snip each one with Ctrl+Shift+A (⌘⇧A on a Mac). SnipAlt drafts the description, you fix names and slide titles, and it is ready to paste. One hotkey, no upload walks through that flow. SnipAlt runs on desktop, so this works best as a short batch at a desk rather than on the floor.

One last habit: write the description before you press Post. Platforms differ on whether you can add or change alt text afterward, so do not count on fixing it later. A few images with good descriptions beat forty without.