CharLimits

Slack Character Counter

Slack allows messages of up to 40,000 characters, which is far more than any reader wants. The limits that actually bite are the short ones: a 250 character channel topic and a 100 character custom status.

Paste your text below to check it against each Slack field before you save it.

Last reviewed: September 7, 2026

Counted against the Slack Message limit.

Counted as grapheme clusters
Message 0 / 40,000

40,000 characters remaining

Long messages collapse behind a Show more link.

  • 0Characters
  • 0No spaces
  • 0Words
  • 0Sentences
  • 0Lines
  • 0Bytes (UTF-8)
  • 0sRead time
  • 0sSpeak time
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        Ctrl + Enter trim to limit · Ctrl + Shift + C copy

        Slack character limits

        Character limits for each Slack field
        FieldLimitNotes
        Message 40,000 Long messages collapse behind a Show more link.
        Channel topic 250 Shown in the channel header on desktop.
        Channel purpose 250 Displayed in the channel details panel.
        Custom status 100 Emoji count toward the limit alongside the text.

        Tips for writing Slack copy

        • A 40,000 character message will be collapsed - use a snippet or file instead.
        • Channel topics cap at 250 characters; write the purpose as one sentence.
        • Custom statuses are 100 characters including the emoji.
        • Long posts work better as canvases or files than as messages.

        Slack character limit FAQ

        What is the Slack message character limit?

        Slack messages can contain up to 40,000 characters. Anything long collapses behind a Show more link, so length works against readability long before it hits the limit.

        How long can a Slack channel topic be?

        Channel topics are limited to 250 characters, as are channel purposes.

        What is the Slack custom status limit?

        A custom status is limited to 100 characters, and any emoji you include count toward that budget.

        Does Slack count emoji differently?

        Slack counts emoji as part of the character total, so a status built mostly from emoji still consumes the 100 character allowance.