Who Can Still Comment on Reddit Locked Posts, and Who Cannot

What are Reddit locked posts?

A moderator can close any thread to new comments, and Reddit locked posts then refuse comments from everyone except that community's moderators and Reddit admins. Reddit's Post Actions article defines the action precisely: "Using the lock action on a post prevents new comments from being made by anyone who is not a moderator of the community or an administrator of Reddit." If a thread you want to answer shows a padlock, read it, then take your reply somewhere else.

A lock is a moderation choice about one thread. It does not hide the post, delete the comments or touch the author's account. The whole conversation stays public at the same URL, frozen at the moment the moderator acted.

What can you still do on a locked post?

You can still vote on a locked post, edit your existing comments and delete them. The same help centre article lists all three: "Community members can still vote, edit their existing comments, and delete their comments." What you cannot do is add anything new, which includes replying to comments already in the thread.

The table sets a locked post next to an archived one, since both end with a missing comment box and people confuse them.

The archived column comes from Reddit's Community settings article, which says users "will not be able to vote or comment on posts older than six months" when archiving is on.

Reddit's own code treats the two states as separate checks. In Reddit's open-source code, last pushed to the reddit-archive/reddit repository on 17 October 2017, the comment validator raises TOO_OLD for an archived thread and THREAD_LOCKED for a locked one, and the THREAD_LOCKED message reads "Comments are locked." A locked thread only blocks you if you fail the subreddit's can_distinguish check, which in that code passed for Reddit admins and for moderators holding the posts permission.

Who can lock a Reddit post, and why?

Moderators lock posts, and Reddit's What mods can do page lists the power in two lines: "Lock threads from receiving more comments" and "Lock comments from receiving more replies." Which moderators hold it depends on the permissions their team gave them.

Moderators can also hand the job to automation. Reddit's AutoModerator documentation defines a set_locked action that "Locks or unlocks the submission or comment," so a rule can lock posts that match a keyword, a flair or a report count without a human clicking anything. The same documentation has a comment_locked option that locks the comment AutoModerator itself posts. Reddit's Developer Platform gives apps the same control through lock() on its Post model, described as "Disables new comments and updates this instance's locked state."

Reddit's help centre gives one worked reason for locking. Its Closing an AMA article tells moderators to "Lock comments in the AMA post if you know the guest will no longer participate," because "you don't want to moderate a dead thread." Beyond that example, Reddit does not publish a list of reasons, and each community sets its own. Read the subreddit's rules and any pinned moderator comment on the locked thread to learn why that one was closed.

Reddit applies a lock of its own in one case. When a redditor promotes a post through Reddit Ads, the help centre's Promote your post article says "promoted posts will be locked (similar to archived posts) so no engagement will accrue to original post."

How do moderators lock or unlock a post?

Moderators lock a post from the mod shield icon under it. Reddit's Post Actions article gives the steps for reddit.com:

1. Open the post in a community you moderate.
2. Click the mod shield icon under the post.
3. Select Lock comments.

In the iOS and Android apps the same menu labels the option Lock. To reverse it, open the same menu and unlock the post. The help centre says "Moderators can unlock a locked post, which re-opens it for commenting," and adds that "You can also lock individual comments in the same way." A locked comment keeps the rest of the thread open and stops replies under that one comment. Reddit's Moderation Queue article describes the comment version as an action that "locks the comment and prevents others from responding to it."

The Data API exposes the same switch. Reddit's API reference documents POST /api/lock under the modposts scope with the line "Prevents a post or new child comments from receiving new comments," and POST /api/unlock to "Allow a post or comment to receive new comments." Each lock and unlock lands in the moderation log, where Reddit's Developer Platform lists lock and unlock among its ModActionType values.

One edge case comes from the 2017 code. Its POST_lock and POST_unlock handlers both return 400 Bad Request when the post is already archived, so in that version a moderator could not lock or unlock a thread past the archive date.

How can you tell whether a Reddit post is locked?

Reddit marks a locked post with a padlock icon next to the title, and hovering it shows the tooltip "Locked post." We checked the markup on 28 September 2026: Reddit's post page ships a padlock status icon labelled "Locked post" and keeps it hidden on threads that are not locked, next to a separate "Archived post" icon for old ones. The missing comment box, while the vote arrows still work, is the other sign.

Code reads it from a field. Reddit's 2017 JSON template includes "locked": item.locked on every post, and Reddit's current Post model documents a locked getter, "Whether the post is locked and new comments are disabled," plus an isLocked() method. A script that reads threads can check that one boolean before it bothers to draft a reply.

Does a locked post mean you did something wrong?

No. A lock applies to the thread and to everyone in it, and the Post Actions article describes no notice to the post's author. That makes a lock different from a removal, where the post disappears from listings and the moderator can attach a removal reason. The guide to removed vs deleted on Reddit covers that case. If your own post was locked and you want to know why, send the moderators a polite modmail and ask.

A lock is also no sign of an account problem. If your comments on open threads get no replies and no votes either, the account itself could be hidden, which is a separate test covered in the Reddit shadowban guide.

What does a locked thread mean for finding leads on Reddit?

A locked thread is one you can read and cannot join, so the useful replies have to go into threads that are still open. The questions in a locked thread still tell you what buyers asked and which answers the community upvoted, which makes it good research. It is a bad place to aim for, because a thread can lock minutes after it starts, and the lock has nothing to do with the post's age.

That is why speed matters on Reddit. RedReplier watches Reddit, X, Bluesky, Facebook and Hacker News for your keywords and ranks each match by buyer intent. Matches land on your RedReplier dashboard within minutes of a post or comment going live, and Reddit alerts go out by email as digests on a cadence you set per keyword, from hourly to daily. RedReplier never posts to Reddit automatically. It drafts a reply, and you review, edit and post it yourself.

When the thread you wanted is locked, do this instead:

1. Note the question and the wording the poster used.
2. Search for the same wording with Reddit search, sorted by new, and look for an open thread.
3. Reply in the open thread with an answer that stands on its own.
4. Do not message the locked thread's poster with a pitch. A cold pitch about a closed thread reads as spam, and reddiquette caps your own content at one in ten submissions anyway.

Frequently asked questions

Can you comment on a locked Reddit post?

Only if you moderate that community or work for Reddit as an admin. Reddit's help centre says a lock "prevents new comments from being made by anyone who is not a moderator of the community or an administrator of Reddit." Everyone else sees the thread without a working comment box.

Can you still upvote a locked Reddit post?

Yes. Reddit's help centre says "Community members can still vote" on a locked post. That is the main difference from an archived post, where voting closes along with comments.

Can you edit or delete your comment on a locked post?

Yes. Reddit's help centre lists editing and deleting existing comments as actions members keep on a locked post. You cannot add a new comment or reply to someone else's.

Can a locked Reddit post be unlocked?

Yes. A moderator of the community can unlock it from the same mod shield menu, and Reddit's help centre says that "re-opens it for commenting." The API equivalent is POST /api/unlock.

What is the difference between a locked and an archived Reddit post?

A moderator locks a post by choice at any age, and Reddit archives a post automatically at six months when the community's Archive posts setting is on. A locked post still takes votes and moderator comments. An archived post takes neither.

Does Reddit notify you when your post is locked?

Reddit's Post Actions article describes no notification for a lock. A moderator can still explain the lock in a comment or by modmail, and if you want the reason, ask the moderators through modmail.

Why do moderators lock AMA posts?

Reddit's Closing an AMA article tells moderators to lock comments once the guest stops participating, because nobody wants to moderate a dead thread. The lock ends the AMA cleanly while leaving the questions and answers visible to anyone who finds the thread later.

Can a bot lock a Reddit post automatically?

AutoModerator can, through a set_locked action that locks or unlocks a submission or comment. A moderator writes the rule once, and after that a keyword, a flair or a report count triggers the lock without anyone touching it again.

Does a locked post disappear from Reddit's listings?

A lock only closes the comment box, so the post stays public at the same URL. That differs from a removal, where the post drops out of listings and the moderator can attach a reason.

What error do you get if you try to comment on a locked post?

Reddit's own code raises a THREAD_LOCKED error with the message "Comments are locked" for anyone who fails the subreddit's can_distinguish check. That check passes for Reddit admins and for moderators holding the posts permission, so their replies still go through.