Username Character Limits and Rules for 14 Platforms (2026)

Username limits depend on the platform. X allows up to 15 characters, Snapchat 3 to 15, TikTok 2 to 24, Twitch 4 to 25, YouTube handles 3 to 30 and Discord 2 to 32. Most accept only plain letters, numbers and a symbol or two, such as underscores or periods, and none lists fancy-font letters as allowed.

A username, or handle, is the unique name in your profile link. Your display name is the label shown next to it, and it follows separate rules. The table covers 14 platforms, using each platform's own help center or developer docs as checked in September 2026. The one unofficial figure is labeled, and where a platform publishes no number, the table says so.

Username rules by platform

"No" means the platform limits usernames to plain a–z or ASCII characters, or rules out special characters. "Not stated" means its rules don't mention styled letters.

Notes on specific platforms

• Instagram doesn't state a maximum in its help center. Third-party guides such as Hootsuite's give 30, so treat it as a working figure, not an official one.
• X says a username must be "more than 4 characters," though another X help page implies 4 is the floor, so plan on 5 or more. Once you change it, your old username is immediately open to anyone.
• YouTube calls the username a handle, separate from your channel name. After a change, it holds your old handle for 14 days, and both links work meanwhile.
• Facebook ignores periods and capital letters when comparing usernames, so john.smith55 and johnsmith55 count as the same name. Your username also applies to Messenger.
• Threads usernames can differ from Instagram ones, but Instagram's help center says a mismatch switches off features such as the Threads badge and sharing Instagram or Facebook posts to Threads.
• Bluesky handles are domain names, such as yourname.com, under the AT Protocol spec. For names ending in a service domain like .bsky.social, Bluesky's open-source server software allows 3 to 18 characters before the suffix.
• Telegram usernames are optional, and the 5–32 range comes from Telegram's API docs.

Username vs display name: where fancy fonts can go

Your username is an ID: unique, part of a web address and typed by people looking for you. Your display name is a label, and the only profile name where styled text stands a chance. Here's what platforms publish about it:

Instagram, Threads, Pinterest, Reddit and Telegram let you edit your name but don't publish character rules for it.

Discord and Snapchat explicitly accept special characters in display names; Facebook, LinkedIn and Twitch rule them out. Even where styling is allowed, it has costs: screen readers may read styled letters one at a time or skip them, a search for your plain name may not match the styled one, and rarer styles can show as empty boxes on older devices. Keep your name readable and style one word at most.

How to pick a username people can find and type

If you want one handle everywhere, pick a name that fits every published length range and character list above:

1. 5 to 15 characters long. X and Snapchat stop at 15, and Facebook, X and Telegram need at least 5.
2. Letters and numbers only. X doesn't allow periods, Facebook doesn't allow underscores, Pinterest doesn't allow punctuation and LinkedIn doesn't allow symbols, so separators don't travel well.
3. Starting with a letter. Snapchat requires it, and Pinterest rejects names made only of numbers.

A few more habits help:

• Say it out loud. If you have to add "underscore" or "zero, not the letter O," people will mistype it. Look-alikes such as l, I and 1 cause the same trouble.
• Don't count on capital letters. YouTube, Facebook, LinkedIn, Discord, Telegram and Bluesky treat JaneDoe and janedoe as the same name.
• Claim it everywhere at once. Telegram even says it can help you get a taken, non-collectible username if you hold the same name on at least two of Facebook, Twitter and Instagram.
• Count before you commit. Paste the name into the character counter and compare the count with the table. For post and bio limits on the same apps, see the social media character limits guide.

Why fancy-font letters get rejected

Text from a fancy font generator isn't a font. Each styled letter is its own Unicode character that looks like a regular one. The bold 𝐛 is U+1D41B, MATHEMATICAL BOLD SMALL B, while the b on your keyboard is U+0062. Unicode's code chart says these letters are meant for math variables, where the style carries meaning, and that ordinary text should use regular letters with formatting.

Each platform's username rules amount to a list of allowed characters. X allows A–Z, 0–9 and underscores. Discord's FAQ says plainly that new usernames can't use non-Latin characters or any special characters besides underscores and periods. Bluesky handles must be ASCII. A styled letter isn't on any of those lists, so the name won't be accepted. For the error itself, see why a fancy font username shows "invalid characters". If you've pasted styled text and need plain letters back, see how to convert fancy text back to normal.

How to do it with BoldlyType

A username generator suggests handle ideas from a short description. It can't claim or register a name for you. BoldlyType's generators are free and need no signup:

1. Open the version for your platform, such as the TikTok username generator, YouTube username generator, X (Twitter) username generator or Facebook username generator. Instagram and Threads versions exist too.
2. Enter your niche or vibe, such as "cozy gamer" or "fitness coach," and add any keywords you want worked in.
3. Generate. You get 15 ideas aimed at staying under 20 characters; the X version sticks to X's 15-character limit. What you type is sent to BoldlyType's server to create them, and nothing gets posted anywhere.
4. Filter the ideas with the table before you reuse them on another app: an idea of 16 to 19 characters is too long for X and Snapchat, and one with a period won't work on X.
5. Check the length in the character counter, then try the name on the platform. The generator doesn't check availability; only the platform's signup or edit-profile screen can tell you if a name is free.

Limitations and what can go wrong

• Rules change. This table reflects help pages as of September 2026. Discord, for one, replaced its #0000 tags with unique usernames.
• Not every number is published. Instagram, Threads and Reddit don't state username lengths in their help centers, and Twitch doesn't list its allowed characters.
• Taken usually stays taken. Usernames are generally first come, first served. X says it can't release inactive usernames, Twitch doesn't release them either, and Reddit never makes a deleted account's username available again.
• Changes have side effects. TikTok changes your profile link, Twitch's old channel URL won't redirect, and Facebook warns you may not get your original username back. LinkedIn keeps your previous URL linked to you for six months.
• Impersonation and trademarks. Facebook and Discord both bar usernames that impersonate others. Twitch may transfer or reclaim a username that infringes a trademark or impersonates someone. Instagram notes that a trademark in a username isn't automatically infringement, though the owner can report it.
• Generated ideas carry no guarantee. An idea may be taken or may match someone's brand, so search it before you build a profile around it.