X bio and alt text checker

On X a display name can be 50 characters, a username 15, a bio 160 and an image description 1,000. Check every field against those limits and X's username rules, with a live profile preview.

  • Runs in your browser
  • Nothing uploaded
  • No sign up
14/50

Passes X's rules

10/15
@

Passes X's rules

130/160

Passes X's rules

16 · no published limit
28 · no published limit
118/1,000

Passes X's rules

Live preview

No problems found

Maya Lindqvist

@mayabuilds

Designer at Relay. Rebuilt our onboarding and halved support tickets. Writing about #accessibility and small teams with @relaydev.

Lisbon, Portugal mayalindqvist.design Joined September 2026

A post image with its description

ALT

Maya at a whiteboard sketching three versions of a signup screen. Sticky notes with user quotes surround the sketches.

An approximation of a profile, not X's exact layout. Counts are one per character; X does not document how emoji count in profile fields.

Live. Everything runs on your device.Nothing is uploaded

How to check your X bio

It takes a minute, and nothing you type leaves your browser.

  1. Fill in your profile

    Type your name, username, bio, location and website over the example.

  2. Watch the meters

    Each limited field turns amber near its limit and red when over.

  3. Read the checks

    Red lines are X rules that would stop a save; amber lines are advice.

  4. Write an image description

    Paste alt text for a post image and check it against 1,000 characters.

  5. Check the preview and copy

    Read the live card as a visitor would, then copy each field into X.

X profile character limits

Each limit links to the X Help Center. Where X publishes no limit, we say so.

Won't save: a fake check mark in the name or bio. Angle brackets and quotes in a bio are not shown. (X Help). For posts, use the X character counter.

X username rules

  • Length

    More than 4 and up to 15 characters.

  • Characters

    A to Z, 0 to 9 and underscores. No spaces, dashes or dots.

  • Reserved words

    Admin and X's brand name are for official accounts.

  • Availability

    X does not release inactive names, and this checker cannot see which are taken.

Sources: changing your username and username registration. Taken? X suggests adding an underscore.

Sample usernames, checked live

  • @jonas_ben

    Passes every documented rule.

  • @relay.dev

    Only letters A to Z, numbers and underscores are allowed. Found: .

  • @maya lindqvist

    Only letters A to Z, numbers and underscores are allowed. Found: space

  • @ab

    X's help center says usernames must be more than 4 characters long.

  • @superlongusername2026

    21 characters. X allows up to 15.

  • @siteadmin

    Contains a reserved word (Admin). Only official X accounts can use it.

  • @Design_2026

    Passes every documented rule.

How to write alt text for X

Alt text is what screen reader users hear instead of seeing your image. Add it with the ALT button. The habits below come from X's own guide.

  • Capture what matters
  • Be succinct
  • Write out text in the image
  • Spell out abbreviations
  • Say the image type
  • Use sentence case
  • Do not repeat the post

Product screenshot

“Image of our new dashboard!!”Skip "Image of" or "Photo of". Assistive technology already says it is an image.

“Screenshot of the Relay dashboard. A line chart shows deploy times dropping from about 4 minutes to 40 seconds over one week.”

Team photo

“team”Very short. Say what is in the image and why it matters to the post.

“Six people from the Relay team laughing around a picnic table in a park, with laptops closed and a cake in the middle.”

Chart

“CHART SHOWING GROWTH”Write in sentence case, not all capitals.

“Bar chart of monthly signups from January to June. Each month is higher than the last, from 120 in January to 610 in June.”

Screenshot of text

“Screenshot”Very short. Say what is in the image and why it matters to the post.

“Screenshot of an email from a customer: "We switched our whole team over this morning. Setup took ten minutes."”

X bio ideas that fit in 160 characters

12 formulas. Copy one, swap the brackets for your own true details, and check it above. Examples are invented.

  • Role and proof

    [Role] at [company]. [One result you are known for].

    Designer at Relay. Rebuilt our onboarding and halved support tickets.

    For people whose work speaks for itself69/160

  • What you post

    Posting about [topic] and [topic], [how often].

    Posting about pricing and small SaaS, every weekday.

    For accounts that want followers who expect a topic52/160

  • Who you help

    I help [audience] [result] without [pain].

    I help freelance designers raise their rates without losing clients.

    For consultants, coaches and freelancers68/160

  • Building in public

    Building [product], [what it does]. [Current milestone].

    Building Notewell, notes that sync offline. Month 7, 400 paying users.

    For founders sharing progress70/160

  • The short list

    [Thing] · [thing] · [thing]

    Typefaces · train timetables · very long walks

    For personal accounts with range46/160

  • Before and now

    Formerly [past role]. Now [current role].

    Formerly a chef. Now a backend engineer who still cooks for the team.

    For career changers with a story69/160

  • The offer

    [What you make]. [How to get it]: [where].

    A weekly letter on hiring for startups. Free: link below.

    For creators with a newsletter, course or product57/160

  • The company account

    [Product] [does what] for [who]. Support: [@handle].

    Relay deploys web apps in seconds for small teams. Support: @relayhelp

    For brand accounts that get support questions70/160

  • The belief

    [A view you hold]. Writing about [topic].

    Good docs are a feature. Writing about developer tools.

    For people with a clear point of view55/160

  • The local

    [Role] in [place]. [What you do there].

    Baker in Porto. Sourdough before sunrise, pastries by nine.

    For local businesses and makers59/160

  • The numbers

    [Number] [things] [done]. [Next goal].

    12 apps shipped, 3 still alive. Working on the fourth.

    For makers with a track record54/160

  • The invitation

    [Who you are]. Ask me about [topic].

    Accessibility lead at a bank. Ask me about screen readers.

    For experts who want questions and DMs58/160

Alt text on every image, without the chore

Kairo Post drafts a description for every image it publishes, which you can edit, and sends both to X together. See the images and media feature, or browse more tools for X.

X bio and alt text questions

How long can an X bio be?
Up to 160 characters. X's help center lists a maximum of 160, and a longer bio will not save.
What is the character limit for an X display name?
Your display name, shown above your username, can be up to 50 characters according to X's help center.
What are the rules for an X username?
More than 4 and up to 15 characters, using only letters, numbers and underscores. Usernames containing Admin or X's own brand name are reserved for official X accounts.
How long can alt text be on X?
Image descriptions can be up to 1,000 characters. X's own guidance still recommends being succinct, clear and detailed.
Why won't X save my bio?
X's help center lists a bio over 160 characters, a fake verification check mark in the name or bio, or a link detected as unsafe. Angle brackets and quotation marks in a bio are not displayed.
Is there a character limit for location and website?
X does not publish one, so the checker shows their length without a limit. If X rejects a long entry, shorten it.
Do emoji count as two characters in a bio?
X documents weighted counting for posts, not for profile fields. This checker counts one per character, so leave a little room if your bio uses emoji.
Is anything I type sent to X or saved?
No. Everything runs in your browser, with no sign up and no cost. Nothing is sent to X, uploaded or stored.

Written by Jonas Ben, founder of Kairo Post. Updated .

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