A Twitter bio for startups is the short profile text, plus the name, handle, header, pinned post and link, that tells a visitor what the product does and who it is for before they scroll. Founder profiles and company profiles do different jobs, and both should be readable in a few seconds.
This play is about that surface. It is not about which account should carry the audience. The play on Twitter for business, founder account versus company account covers that choice. It is also not a posting plan. The play on how AI founders grow on X before launch covers the months of posting, and the X content strategy for technical founders covers what to say each week. Fix the profile first. A good post that lands people on a confusing profile wastes the click.
What the profile has to do
The profile has to answer a visitor who arrived from a reply, a repost, or a launch post and has not decided to care yet. They will read the name, the bio, and maybe the pinned post. They will not read your last forty posts to figure out the product.
So the profile has one job: make the product and the person it is for obvious. Cleverness that hides the product fails that job. Think of the pieces as one set.
- Name: who is speaking, with the product visible if the handle cannot carry it.
- Handle: a short, typeable address.
- Bio: the sentence, inside the limit X publishes.
- Header: a picture that supports the sentence and still works if someone never reads the words in the image.
- Pinned post: the first post they see, which should prove or explain the sentence.
- Link: a page that says the same thing and offers one next step.
If any piece contradicts another, visitors believe the contradiction and leave.
The limits X publishes
The numbers below are from X’s own help pages, not from a template site. The live help center often blocks automated checks, so these are archive copies of the pages.
X’s article How to customize your profile (archived June 10, 2026) says you can edit:
- Header photo, also called a banner, with recommended dimensions of 1500 by 500 pixels.
- Profile photo, with recommended dimensions of 400 by 400 pixels.
- Name.
- Bio, maximum 160 characters.
- Location, website, and birth date.
The same page says photos can be JPG, GIF, or PNG, and that X does not support animated GIFs for profile or header images. It also explains how to pin a post so that when others visit your profile, that post is the first one they see. You pin from the post itself, and you can unpin it later. The page does not describe a character limit for the website field, so this play does not invent one. Put a real URL there and check that it opens.
X’s article How to find available X handles or usernames (archived March 18, 2025) says a username cannot be longer than 15 characters, and that your name can be longer, up to 50 characters. A username can only contain letters, numbers, and underscores. It cannot contain symbols, dashes, or spaces. Usernames containing the words Twitter or Admin cannot be claimed unless they are official X accounts. If the handle you want is taken, including by a suspended or deactivated account, the page says you need a different one. X’s own illustration is adding an underscore before or after a desired name, not a promise that a particular handle is available.
Write to 160 characters and stop. Do not put the only explanation in the header. People read the bio on a phone, and tiny words in a header fail when the crop changes.
X’s authenticity policy does not allow fake personas that deceive, including AI generated profile photos, copied bios, or misleading profile information used to deceive. You do not have to display a legal name. You do have to not impersonate someone else.
Founder bio and company bio
The founder profile and the company profile should agree and should not be copies.
The founder bio says a person is building a specific product for a specific kind of user. It can include a role (“cofounder”) because that tells the visitor why this person is speaking. It should not be a résumé. Past employers and a list of interests do not help a stranger understand the product unless one of those facts is the product.
The company bio says what the product is, who it is for, and the next step. It should sound like a product, not like a person with hobbies. A company bio written in a jokey personal voice makes people unsure whether the account is the company.
Link them. The founder bio can name the company handle. The company bio can name the founder. A visitor who likes the person should be able to find the product, and a visitor who arrived at the logo should be able to find a human. The account strategy play explains why, before launch, most of the posting still happens on the founder account. The bios can reflect that without the company profile looking abandoned. A quiet company profile can still be clear.
If several founders each post, one bio carries the building story. The others can be shorter and point at the same product. The company bio stays the stable description.
Name, handle, header, pin and link
Name
The name field is 50 characters on the page cited above. Use it for the thing visitors should recognize: a personal name, or the product name people will search. If you need one clarifier, make it the job rather than a string of buzzwords.
Handle
The handle is 15 characters or fewer, letters, numbers, and underscores. Prefer the product name or the founder’s name. If the exact name is taken, change it in a way people can still type. Do not use a handle that impersonates another product.
Header
The recommended header is 1500 by 500 pixels, JPG, GIF, or PNG, not an animated GIF. Treat it as a poster, not as a document. A simple product image, a short phrase in large type, or a calm brand frame is enough. If the phrase is essential, repeat it in the bio. Visitors who never load images, or who see a cropped header, should still understand you.
Pinned post
Pin the post that does the most for a new visitor. Good pins show the product doing one job, or explain the problem in the words your user would use. Weak pins are an old funding announcement, a joke that needs context, or a thread that starts with “thread” and never says what the product is. You can change the pin when the product changes. An outdated pin is worse than no pin, because X shows it first.
Link
Point the website field at one page that matches the bio: a product page, a waitlist, or a single post that explains the product if the site is not ready. Do not point at a link hub full of unrelated offers. The visitor came to understand one product. Give them one next step. Check the link on a phone after you save the profile.
Patterns you can copy as templates
The lines below are templates, not accounts. The names are made up. Replace the brackets before you publish anything. Do not present a filled in template as a real company.
Founder, before launch
Building [product] so [who] can [job] without [painful workaround]. Cofounder at [company]. Writing the build in public.
Founder, product already usable
[Product] helps [who] [job]. I am building it with [company]. The pinned post is the shortest demo.
Company
[Product] is [what it is] for [who]. It [one concrete outcome]. Try it: [one path]. Built by [founder handle].
What to cut from a draft
- A list of four audiences. Pick the one this account is for.
- “Future of work”, “AI powered”, or “reimagining” with no job under them.
- Emoji that replace words you needed for the sentence. A single mark is fine. A row of them eats the 160 characters and hides the product.
- Hashtags in the bio. Visitors do not need a tag to understand you, and the characters are better spent on the job.
Read the draft out loud. If you cannot say what the product does by the end of the first line, rewrite the first line and let the rest follow.
Mistakes that make a clear product look vague
The product is only in the header. The founder bio should sound like a person and still name the product. A bio that is only a list of hobbies tells a visitor nothing.
The company bio is a slogan. Add the job so a visitor can picture the work.
The name, the bio, and the pin tell three stories. Decide one story and make the pieces match.
The handle is clever and unsearchable. Use the 15 characters for something people can guess.
The link goes to a dead page or a different product. The page has to deliver what the profile promised.
The profile pretends. A generated face presented as a real teammate, a copied bio, or an invented customer quote fights the authenticity rules above.
When the pieces match, stop editing the bio every day. Change it when the product changes. The posts can vary. The profile should be the stable sentence.
If the profile is up and you still cannot tell what a visitor understands, ask for a teardown. The form reaches our launch team directly. Bring the account as it is. The sentence is the thing worth fixing first.