Slack Character Limit (2026) | Messages, Channels, Status & Topics

Published: April 2026 | Last Updated: April 2026

Quick Answer

Slack messages allow up to 40,000 characters. Channel names are limited to 80 characters. Status text allows 100 characters.

Field	Character Limit	Notes
Message	40,000	Extremely generous — one of the highest limits
Channel Name	80	Lowercase letters, numbers, hyphens, underscores
Channel Topic	250	Short description shown at the top of a channel
Channel Purpose	250	Longer description in channel details
Display Name	80	Your visible name in the workspace
Status Text	100	Your custom status message
Status Emoji	1	Single emoji alongside your status
Profile Title	100	Job title in your Slack profile
Thread Reply	40,000	Same as standard messages
Canvas	Unlimited	Slack Canvas documents have no character limit

40,000 characters is massive. That's roughly 6,000–7,000 words. If your message is approaching this limit, consider a Slack Canvas or a document instead.
Channel names should be descriptive. Use a consistent naming convention like #team-engineering or #project-launch-2026.
Keep status messages concise. You have 100 characters, but most people only read the first few words and the emoji.
Use threads for detailed responses. Long messages in the main channel create noise. Thread your detailed responses.
Check message length. Use our character counter for those rare occasions when you're writing a truly long Slack message.

Draft long Slack messages in our free word counter tool to check character count and reading time before sending.

Paste your text into our free word counter tool to instantly count words, characters, sentences, paragraphs and pages.

What is the Slack message character limit?

Slack messages can be up to 40,000 characters long. This applies to both channel messages and direct messages.

What is the Slack channel name character limit?

Slack channel names are limited to 80 characters. They can only contain lowercase letters, numbers, hyphens, and underscores.

What is the Slack status character limit?

Slack custom status text is limited to 100 characters, plus one optional emoji.

Is there a limit on Slack Canvas?

Slack Canvas documents have no character limit. They are designed for longer-form content and documentation.