for every text fieldA post takes 500 characters, and a text attachment adds up to 10,000 more. Through the API an emoji counts as its UTF-8 bytes, so it uses more than one. Paste a post below to count it.
Checked on against 7 sources.
omnisocialsThreads gives you 500 characters per post. That is room for one clear idea and a question. Need more? Attach up to 10,000 characters of text to the post, or split the idea into a thread of replies, each with its own 500. What do you use the extra room for? #writing
A Threads post or reply takes 500 characters. Since September 2025 you can attach up to 10,000 characters of text to a post, with bold, italic, underline and strikethrough. Through the API, a text attachment only goes on a text-only post, and not on one with a poll.
Threads' API counts each emoji as its number of UTF-8 bytes, so one emoji usually uses 4 of the 500. A post takes one topic tag of up to 50 characters and up to 5 links, and alt text takes up to 1,000 characters.
Since December 22, 2025, a post with more than 5 links fails to publish through the API. Repeated links count once. Source
Schedulers can add text attachments to text-only posts. In the app at launch, attachments could not be scheduled or edited. Source
Meta: "we're rolling out a way to attach up to 10,000 characters of text to a post." The post itself stays at 500. Source
Scheduled posts can carry a poll of 2 to 4 options, each up to 25 characters, on text-only posts. Source
500 characters is a few short sentences. Say the idea first and the detail after.
The API counts an emoji as its UTF-8 bytes, usually 4. Ten emoji can cost 40 characters.
A text attachment holds up to 10,000 characters with basic styles. Through the API it only goes on text-only posts.
A chain of replies gives every part its own 500 characters, and each part can carry its own photos.
A post with more than 5 different links fails to publish through the API since December 2025.
Alt text describes a photo or video for screen readers. Through the API it takes up to 1,000 characters.
InstagramInstagram character limits
TikTokTikTok character limits
FacebookFacebook character limits
LinkedInLinkedIn character limits
YouTubeYouTube character limits
X (Twitter)X (Twitter) character limits
PinterestPinterest character limitsThreadsThreads character limitsThis page
BlueskyBluesky character limits
TelegramTelegram character limitsEach limit comes from Meta's Threads API documentation or Meta's newsroom, read on October 17, 2026. Where Threads publishes no number (bio, username, DMs), the table says "Not published" instead of repeating a figure from another guide. The API limits are what a scheduled post must fit, since every scheduler posts through the API.
