Instagram DM length limit

Meta’s developer documentation for sending Instagram messages says the message text must be UTF-8 and 1000 bytes or less. That is the limit that applies to anything sent through the official messaging API: scheduling tools, chatbots, inbox software and DM automation.

The same documentation does not say how long a message you type by hand in the Instagram app can be. Guides such as Sprout Social’s character limits page list limits for posts and comments but give none for DMs. We found no official figure, so this page does not invent one. If you need a hard in-app number, test it on your own account.

UTF-8 is the way text is stored as bytes. Letters from the English alphabet take one byte each, so a message in plain English hits the limit at about 1,000 characters. Other characters take more, so a message in another language or with several emoji runs out of room sooner.

The curly apostrophe is a trap for English writers. A word processor often turns a plain apostrophe into ’, which costs three bytes instead of one. A message full of contractions and typographic quotes is a little shorter than its character count suggests.

Most useful DMs are far shorter than 1,000 bytes. A price list, an opening hours reply or a “Reply YES and I’ll send the guide” message is a few hundred. The limit matters when an automated reply pastes in a long description, a full policy or several paragraphs of instructions.

• Split long information into two or three short messages, or send one clear message and a link once the person replies.
• If you write in Hindi, Arabic script, Chinese or any other non-Latin script, count on a much smaller character budget than the same text in English.
• A run of emoji eats bytes quickly. Ten decorated emoji can cost as much as 40 to 80 English letters.
• Links count as text too, so a long tracking URL uses part of the allowance.

Tip: To count bytes exactly, open the console in your browser and run new TextEncoder().encode("your message").length, with your own text between the quotes. The number it returns is the byte count UTF-8 gives.

Length is rarely what stops an automated message. Meta’s rules on timing matter more. You can message someone within 24 hours of their last message to you. A private reply to a comment must go out within 7 days of the comment, and only one private reply is allowed per comment.

The first message sent to someone who commented must be plain text: Instagram allows no links or buttons in it. That makes the first DM a good place to be brief anyway. A short question that invites a reply works better than a wall of text.

This page covers text messages only. Other message types, such as image attachments and templates with buttons, have their own limits in Meta’s documentation, which we did not check for this page.