Every content calendar eventually runs into the same question: how long should this post actually be? We had a number in mind after our consistency research — customers kept asking us for one — so we pulled two years of LinkedIn data to settle it. 51,696 company-page posts, 158,602 posts total across every channel we manage, no cherry-picking. The answer turned out to be more useful than a single number.
There is a sweet spot. But it moves depending on what's attached to the post, it's wider or narrower depending on how consistently a page posts, and it's a completely different sweet spot on a personal profile than on a company page. Here's what actually held up.
What we analyzed
We pulled every post published from 488 connected LinkedIn channels between September 2024 and September 2026, matched each one to its performance data, and counted words in the caption. Word count, not characters. LinkedIn's own 3,000-character cap works out to a little over 500 words in practice, and that's exactly where our longest posts top out.
LinkedIn only exposes full analytics — impressions, shares — for company pages, not personal profiles. So the core analysis below is scoped to the 51,696 posts where we have that: the same population our consistency report used. We come back to personal profiles separately in their own section, using the metrics LinkedIn does expose for them.
The sweet spot is a plateau, not a number
If you want one number: 76 to 100 words gets the most impressions per post (347 median) and ties for the highest engagement. But engagement barely moves between 76 and 175 words: it sits at a flat median of 9 across that entire range. Below 50 words, engagement drops to 5 or lower. Past 250 words, it falls to 6.
- 1–50 words: median 3 engagements, 221 impressions
- 76–175 words: the plateau, median 8–9 engagements the whole way, impressions peaking at 347
- 251+ words: median 6 engagements, 175 impressions, barely better than posts a fifth as long
That held up when we split the two years in half and checked each year separately, and it held up whether a page posted twice a week or once. The one place it moved: pages that post a steady once a week get a narrower version of the plateau. Engagement peaks sharply at 76–100 words and drops off faster than it does for twice-a-week pages, which get away with anything from 76 to 175. Post less predictably than that, and length starts to matter less than just showing up.
It depends on what you attach
This is the part that changed how we'd answer the original question. We split the same posts by what was attached, and the "sweet spot" moved by a factor of two depending on the format:
- Photo: 76 to 100 words. The shortest sweet spot of any format. The image is doing the work; the caption doesn't need to.
- Plain text, no attachment: 101 to 125 words. A little more room than a photo post, since there's nothing else on the page to carry the point.
- PDF carousels: 126 to 175 words. This one surprised us. We expected a strong visual format to want a short caption, the same logic as photo. Instead carousels want a longer one, probably because the caption is previewing several slides of content, not standing next to a single image.
- Video: 176 to 200 words. Almost double the photo sweet spot.
- Article and link posts: 176 to 200 words, and the clearest curve of any format. Engagement climbs steadily from a median of 1 at the shortest lengths to 15 at 176–200 words. There's no ambiguity here: more words before the link performs better, all the way up to 200.
PDF/carousel posts also had the single best overall numbers of any format — 433 median impressions, well ahead of photo or video — which makes the length correction worth taking seriously if carousels are already part of your mix.
Sharing a link? Go long
There's a long-running argument in LinkedIn marketing about whether a caption in front of an outbound link should be short (get to the point, don't bury the link) or long (build context before you ask someone to leave the platform). Our data has a clear answer for clicks specifically, not just engagement: median clicks climb from 1–3 at under 100 words to 18 at 176–200 words, with the mean pulled up to 85 by the strongest performers in that band. Shorter captions on link posts aren't being efficient. They're leaving clicks on the table.
Personal profiles play by different rules
Personal-profile posts don't come with impressions or share counts from LinkedIn's API — only likes and comments — so we can't compare them to company pages on the same metrics directly. But using likes and comments as the measure on both, the pattern is genuinely different. Company pages peak at 76–100 words on this measure too, consistent with everything above. Personal profiles keep climbing well past that, settling into a broad plateau from roughly 150 to 300 words with no sign of the drop-off company pages show past 250.
One number stood out enough that we checked it twice: personal-profile video posts hit a median engagement of 54 at 176–200 words: the single highest number anywhere in this analysis, versus single digits to the high teens for every other length and format combination in either population. Engagement stays elevated through 201–225 words (median 27) before thinning out past 250. That's a median, not an average pulled up by one viral post: over half the posts in that 176–200 band are genuinely performing at that level. If you're posting video from a personal profile, the caption is doing far more work than a two-line "check this out."
What you're already doing right, and wrong
We compared the length people are actually writing against the length that performs best, per format. Photo captions are already close to right: a median of 92 to 106 words against a sweet spot of 76–100. Nothing to fix there.
Video and link posts are a different story. The average video caption runs 94 to 108 words, against a sweet spot of 176–200. The average article caption runs 58 to 72 words, against the same 176–200 target. Both are being written at roughly half the length, or less, that actually performs best, on company pages and personal profiles alike. If there's one habit to change coming out of this, it's that one: when you attach a video or a link, don't write a caption like it's a photo post.