I spent a morning this week making one square image for LinkedIn. Three versions, one workspace, no stock photos. Then I shrank it down and looked at it the way an actual person would — small, in a feed, thumb already moving — and half of it was unreadable. That is the trap in social media image design: you build it big, you judge it big, and nobody ever sees it that way.
The canvas lies to you
I designed at 1200 pixels wide. On my screen it was crisp, balanced, easy to read. It looked finished.
In a real feed, that same image renders at roughly 500 pixels wide. Everything shrinks by a factor of about 0.42. The body copy I had set at a comfortable size landed on screen at 10 to 13 pixels — the size of the fine print at the bottom of a receipt.
Nothing was broken. Nothing looked wrong on my monitor. The image was simply built for a place it would never be seen.
What size does my text need to be on a social post?
Here is the working rule I now use: anything that lands under about 18 pixels at feed size is decoration, not information.
Multiply every text size on your design by 0.42 and ask whether you would read the result. If the answer is no, that line is not communicating — it is texture.
Fixing mine meant going bigger than felt comfortable:
- Section headings went from 31 up to 42
- Sub-lines from 24 up to 30
- List items from 27 up to 32
- Small labels from 19 up to 26
At full size the new version looks almost too bold. In the feed, it finally reads. That trade is worth making every time, because the feed is the only place that counts.
Contrast is the other half of the problem
Size was not the only thing hiding. When I checked the colours against the standard for readable text, 11 separate elements failed — including my own business name and the tagline underneath it, on all three versions.
Soft grey on a dark background reads as tasteful and expensive at full size. Shrink it and it disappears entirely.
I also found decorative frames running straight through the single most important word on the page. On a big screen it read as a design flourish. Small, it read as a smudge across the headline.
The pattern is the same in both cases: details that feel refined when you are close up become noise when you are far away.
The cheapest good image is usually one you already own
The other half of this build is worth saying plainly, because it saves real money. That card cost nothing to produce. No image generation, no stock licence, no designer.
The only photograph on it is my own headshot, already sitting on my hard drive. The colours, the fonts and the overall look were lifted from my own website, so the card and the site are unmistakably the same business.
An asset you already have, used well, beats a fresh one made badly. Most small businesses have more usable material on their phone than they think — the shop, the work, the person doing it.
The 30-second check before anything goes out
This is now a fixed step, not an instinct.
Shrink it
Look at the image at roughly the width it will occupy in a feed. On a phone that is easy: send it to yourself and look at it there.
Read it at arm's length
Hold it where a normal person holds a phone. Not up close, not zoomed.
Cut what you cannot read
If a line does not survive that test, either make it much bigger or delete it. Leaving unreadable text on a picture does not make you look thorough. It makes the image look busy.
The lesson, in one line: an image is only as good as it looks in the place it will be seen — so go and look at it there before you post it.
If you make your own graphics, run those three steps on the last thing you published. You will probably find a line you have been publishing for months that nobody has ever read.