The short version
- An AI headline generator writes better lines for designs when the prompt includes a character limit, the format and a single message.
- Headlines on social graphics and posters should usually be far shorter than article headlines, often under 30 characters.
- Asking for many options and choosing one, then editing it by hand, gives better results than accepting the first line an AI writes.
- Specific words such as a day, a place or a product name make a short headline stronger than general claims.
- Always check AI-written headlines for invented facts, offers and dates before they go on a design.
On this page
An AI headline generator can write good lines for a design, but only if you treat the design as the brief. Tell it the format, the character limit, who will read it and the one thing it must say, then ask for ten options and pick one. Without those limits, AI writes article headlines: long, clever and impossible to set large on a 1080 px square. With them, you get short lines that actually fit.
Why design headlines need hard limits
On a social graphic the headline is set big enough to read at thumbnail size, so every extra word shrinks the type. On a poster it has to read from across a room. In both cases the space is fixed and the headline has to fit it, not the other way round. AI tools don't see your layout, so you have to give them its limits in numbers.
Written without a limit
- Discover the cosiest new spot in town for your morning coffee ritual
- Everything you need to know about our exciting autumn menu launch
- Join us for an unforgettable evening of live music and good company
Written to 25 characters
- Coffee by 7am.
- Autumn menu, from Monday.
- Live jazz, Friday night.
Headline length by format
These are working limits for the main line on a design, counting letters and spaces. They come from setting type at a size that reads in a feed, not from a platform rule, so treat them as a starting point and test your own layouts. Font size for social media explains the sizing side.
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Headline limit
Words, roughly
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Headline limit
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25 characters on a portrait post. The line can be set large and still breathe.
The same message cut to one word for a story, with the context moved to the eyebrow.
How to prompt an AI headline generator
- 1
Give the format and the limit
"Instagram post, 1080×1350, headline under 30 characters including spaces." A number beats "short" every time.
- 2
State one message
One fact the reader must take away: a launch, a date, a change. If you have three messages, you have three designs.
- 3
Name the reader
"Regulars who come in before work" gives the AI something to aim at. "Everyone" gives it nothing.
- 4
Add your voice and your bans
Paste two headlines you liked and list words you never use. Most generic AI copy comes from a few overused words.
- 5
Ask for ten, choose one, edit it
Request variety: a plain statement, a question, a number, a single word. Pick the strongest and make it yours by hand.
Write 10 headlines for an Instagram post (1080x1350).
Business: The Corner Kitchen, a neighbourhood restaurant.
Message: the autumn menu starts on Monday.
Reader: locals who eat out once a week.
Limit: 30 characters including spaces. Count them and show the count.
Voice: plain, warm, confident. Like: "Soup season." "Back from Monday."
Never use: discover, elevate, unforgettable, exciting, exclamation marks.
Mix: 3 plain statements, 3 with a day or time, 2 single words, 2 questions.
Do not invent prices, dishes or offers.Headline patterns that work at small sizes
Short headlines work when they are specific. A day, a place, a product or a number carries more meaning per character than any adjective. These patterns give an AI clear shapes to fill, and give you something to compare its output against.
Example
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Example
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A thing plus a time on a square post. The detail line carries the extra information so the headline doesn't have to.
Check before it goes on the design
AI headline generators fill gaps with invention. A line like "Open late all week" may read well and be completely untrue. Before you set a headline, check every fact in it, read it aloud in your own voice and look at it at feed size. If it reads clearly on a phone held at arm's length, it works.
Gradiently's Designer writes the words as well as the layout. It asks what you need, writes in your brand kit's voice and sets the headline on your Mark, whose calmest region moves behind the text so short, large lines stay readable. For captions that go under the post rather than on it, see AI caption generator; for the craft of on-image copy, social media copywriting and headline fonts.
Questions people ask
How long should a headline on a social media post be?
For the main line on a graphic, aim for around 30 characters or three to six words on a feed post, and fewer on stories and thumbnails, so the type can be set large enough to read at small sizes.
Can ChatGPT write headlines for my designs?
Yes. Give it the format, a character limit, the reader and one message, ask for ten options with their character counts, and edit the best one by hand.
Why are AI headlines so generic?
Without limits, AI falls back on common words and long sentences. Banning overused words, giving examples of your voice and asking for specific details such as days or places makes the lines sharper.
What makes a short headline work?
Specificity. A day, a place, a product or a number tells the reader more in fewer characters than adjectives such as amazing or exciting.
Written by Gradiently
The team behind Gradiently, a design tool built around Marks: living gradients that make everything you design look like yours.
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