---
title: "Instagram private replies API: rules and limits"
description: "The Instagram private replies API explained from Meta's docs: one DM per comment, the 7-day deadline, 750 an hour, and how to write the one message."
url: https://replyrep.io/guides/instagram-private-replies
updated: 2026-10-19
---

# Instagram private replies API: the rules, limits and examples

The Instagram private replies API lets an app send one private DM to a person who commented on a professional account's post, reel, story, Live or ad. Meta allows one message per comment, sent within 7 days (Live: only during the broadcast), at up to 750 an hour for posts and reels. Further messages need the person to reply first.

## What is the Instagram private replies API?

Private replies are the part of Meta's API that turns a public comment into a private conversation. Meta's page describes it as the way "to programmatically send a private reply to a person who commented on your app user's Instagram professional post, reel, story, Live, or ad post." Every comment-to-DM tool on the official API, including ReplyRep, is built on it.

Meta documents private replies in two places, one for each way of connecting an Instagram account: the Instagram Platform docs (last updated June 30, 2026) and the Instagram Messaging docs on the Messenger Platform (last updated July 2, 2026). The wording differs slightly. The rules are the same. We found no 2026 change to the private reply rules (one message, 7 days, 750 an hour) in either Meta changelog.

## How does a private reply work?

1. **Someone comments.** A person comments on a post, reel, story, Live or ad on an Instagram professional account. For comment-to-DM, the comment usually contains a keyword like GUIDE or LINK.
2. **The app sends one private reply.** The app sends a single message to that person, tied to their comment. It must go within 7 days of the comment, or during the broadcast for Live.
3. **The reply lands.** In the person's Inbox if they follow the account, or in their Requests folder if they do not. Meta adds a link to the commented post.
4. **If they reply, the conversation opens.** Their response opens the standard messaging window. The app can keep talking for 24 hours from their latest message.
5. **If they do not reply, that is the end.** No second message can be sent through the API off the back of that comment.

## What are the private reply rules and limits?

*Instagram private reply rules, as written by Meta*

| Rule | What Meta says | Source |
| --- | --- | --- |
| Messages per comment | "Only one message can be sent to the commenter" | Private replies, Instagram API |
| Deadline | Within 7 days of the comment for posts, ads and reels | Both private replies pages |
| Live comments | "private replies can only be sent during the live broadcast" | Private replies, Instagram API |
| Follow-ups | Only if the recipient responds, and within 24 hours of the response | Private replies, Instagram API |
| Where it lands | Inbox if they follow the professional account, Requests if not | Private replies, Instagram API |
| What it contains | "The private reply message includes a link to the commented post." | Private replies, Instagram API |
| Rate limit, posts and reels | 750 calls per hour per Instagram professional account | Instagram Platform overview; Messenger Platform rate limits |
| Rate limit, Live | 100 calls per second per Instagram professional account | Instagram Platform overview; Messenger Platform rate limits |

> Your app can send this private reply within 7 days of the creation time of the comment, excepting Instagram Live, where replies can only be sent during the live broadcast.
> (Meta, Private replies, Instagram API (June 30, 2026))

One detail trips up a lot of people. Meta's general Messenger Platform docs list a comment among the actions that open a 24-hour window. For Instagram comments, the Private Replies pages are stricter and more specific: one message, then nothing until the person responds. Follow the stricter rule. Our guide to the [Instagram 24-hour messaging window](https://replyrep.io/guides/instagram-24-hour-messaging-window) walks through the difference.

## Who can use private replies?

- **Professional accounts only.** Meta says app users "must have an Instagram professional account", which can be a business or a creator account.
- **No Facebook Page needed with Instagram Login.** Meta's overview says the Instagram API with Instagram Login "serves Instagram professional accounts without requiring a linked Facebook Page." The Facebook Login setup does need a connected Page.
- **Apps serving other people's accounts need Advanced Access.** Meta says this "requires App Review and Business Verification."
- **A human must be reachable.** "Apps that use the Instagram Messaging APIs must have an escalation path to a human agent."

## Private reply vs public reply vs DM: what is the difference?

|  | Private reply | Public comment reply | Reply to a DM |
| --- | --- | --- | --- |
| Who sees it | Only the commenter | Everyone on the post | Only the person |
| What triggers it | A comment | A comment | A message from the person |
| How many | One per comment, more only after they respond | Not a messaging limit | As many as needed inside the window |
| Time limit | 7 days (Live: during the broadcast) | None in the messaging rules | 24 hours from their latest message |
| Where it lands | Inbox or Requests | Under the comment | The existing conversation |

Most good comment-to-DM setups use the first two together: a public reply under the comment ("Sent, check your DMs") and the private reply with the link. The [comment-to-DM glossary entry](https://replyrep.io/glossary/comment-to-dm) and [private reply definition](https://replyrep.io/glossary/private-reply) cover the terms.

## How do you write the one message?

Because Meta allows one private reply per comment, the message has two jobs: deliver what you promised, and give the person a reason to reply so the conversation can continue. A teaser that says "reply YES for the link" spends your one message on nothing.

**Private reply that delivers and invites a reply**
- Comment keyword: GUIDE
- Public reply: Just sent it to your DMs.
- DM: Here's the free posting guide you asked for: [link] / Quick question: are you posting reels or carousels more right now? I'll send the matching checklist.

- **Link in the first message.** If they never reply, this is all they get.
- **Say where it came from.** "You asked for this under my reel" reads as expected, especially in Requests.
- **End with an easy question.** A reply opens the 24-hour window for the next message.
- **Keep the promise exact.** Meta's spam policy names "failing to deliver promised experiences".

## What does this mean for a viral post?

The 750 per hour limit is per account, across all posts and reels. That is 18,000 a day at full speed. A reel that pulls 3,000 keyword comments in an hour needs about four hours to answer everyone. That is slower than the usual few seconds, but far inside Meta's 7-day deadline, as long as the tool keeps the overflow instead of dropping it. Our full breakdown is in [Instagram DM limits](https://replyrep.io/guides/instagram-dm-limits).

## How does ReplyRep use private replies?

- **[Comment-to-DM](https://replyrep.io/features/instagram-comment-to-dm) on every plan.** Someone comments your keyword on a post, reel or ad, and the private reply goes out about three seconds later. Comments without the keyword are left alone.
- **A public reply alongside it.** [Comment Auto Reply](https://replyrep.io/features/instagram-comment-auto-reply) (Lite and up) answers under the comment, worded differently each time.
- **Overflow waits its turn.** The [Excess DM Queue](https://replyrep.io/features/viral-post-dm-queue) (Lite and up) holds anything over Meta's limit in order, and SendBack DMs (Lite and up) go back for interactions that were skipped or delayed.
- **Official API, no password.** ReplyRep is a Meta Business Partner on Meta's official Instagram API, and you connect through Meta's login.

ReplyRep automates comments on posts, reels, stories and ads, story replies, story mentions and DMs. It does not offer Instagram Live comment automation.

**Send your first private reply** Pick a post, set a keyword and write the DM. It takes about four minutes.

## Common myths about private replies

- **Myth: A comment opens a 24-hour window.** For Instagram comments, it allows one private reply. More only after the person responds.
- **Myth: You must reply within 24 hours of the comment.** Meta gives 7 days for posts, reels and ads. Live is the exception.
- **Myth: Private replies only work on posts.** Meta lists posts, reels, stories, Live and ad posts.
- **Myth: Private replies always land in the inbox.** Non-followers get them in Requests.
- **Myth: You can reply privately to old comments in bulk.** Only comments from the last 7 days can get a private reply.

Sources:
- [Meta: Private replies, Instagram API (last updated June 30, 2026)](https://developers.facebook.com/documentation/instagram-platform/private-replies)
- [Meta: Private replies, Instagram Messaging (last updated July 2, 2026)](https://developers.facebook.com/documentation/business-messaging/instagram-messaging/features/private-replies)
- [Meta: Instagram Platform overview (last updated September 28, 2026)](https://developers.facebook.com/documentation/instagram-platform/overview)
- [Meta: Messenger Platform rate limits (last updated March 23, 2026)](https://developers.facebook.com/documentation/business-messaging/messenger-platform/overview/rate-limiting)
- [Meta: Send a message, Messenger Platform (last updated September 28, 2026)](https://developers.facebook.com/documentation/business-messaging/messenger-platform/send-messages)
- [Meta: Instagram Messaging overview (last updated September 28, 2026)](https://developers.facebook.com/documentation/business-messaging/instagram-messaging/overview)
- [Meta: Developer Policies (last updated February 3, 2026)](https://developers.facebook.com/devpolicy/)

## Frequently asked questions

### How many private replies can I send per comment?

One. Meta's docs say only one message can be sent to the commenter. If the person responds to that message, you can continue the conversation within 24 hours of their response. If they do not respond, no further message can be sent through the API.

### How long after a comment can I send a private reply?

Up to 7 days from when the comment was created, for comments on posts, reels and ads. For Instagram Live comments, only while the broadcast is still live. Once it ends, private replies to those comments cannot be sent.

### What is the private replies rate limit?

750 calls per hour per Instagram professional account for comments on posts and reels, and 100 calls per second for Live comments. Meta publishes both on the Instagram Platform overview and the Messenger Platform rate limits page.

### Do private replies work on Instagram ads?

Yes. Meta's private replies page lists ad posts among the surfaces, along with posts, reels, stories and Live. The same rules apply: one message per comment, sent within 7 days of the comment.

### Do private replies need a Facebook Page?

Not with the Instagram API with Instagram Login, which Meta says serves professional accounts without a linked Facebook Page. The older Facebook Login setup requires the Instagram account to be connected to a Page. Either way, the account must be a professional account.

### Does a private reply show which comment it came from?

Meta says the private reply message includes a link to the commented post. That helps the person, especially a non-follower reading it in their Requests folder, see straight away why your account messaged them.

Last updated 2026-10-19. Source: https://replyrep.io/guides/instagram-private-replies