Free tool
YouTube Comment Generator
Three jobs that all involve the comment box: the comment you pin under your own video, the replies you write all week, and a mockup for a thumbnail. None of them post anything anywhere.
Every image carries a “mockup — not a real comment” mark, and there is no verified badge. This is for thumbnails and slides, not for putting words in a real person's mouth.
What should you pin in the comments?
A correction, the links you mentioned, the chapters, and one question worth answering. The pinned comment sits at the top of a section people actually read — unlike the description — which makes it the best place to put the thing you most need seen.
Why the pinned comment matters more than it looks
The description is the field everyone optimises and almost nobody opens. The comment section is the opposite: people scroll into it by habit, and the pinned comment is the first thing there. If you have one thing that must be seen — a correction, a link you promised, a warning that step four changed — that is where it belongs.
It is also the one piece of text on your video you can fix after publishing without touching the upload. A mistake caught an hour after going live can be addressed at the top of the comments in thirty seconds.
Which is the argument for putting the correction there rather than editing the description and hoping. Nobody who watched the video before the fix is going back to the description to see whether it changed.
Why the Pin button is greyed out
The commonest reason is not a bug. Pinning requires advanced features on your channel — the identity-verified tier — and YouTube notes it can take up to 24 hours after switching them on before the option appears. It is not tied to monetisation or a subscriber count, which is what most guides assume.
The other reasons are blunter. Comments are turned off entirely on content set as made for kids, at channel or video level, so there is nothing to pin. Comments can be off or paused on that specific video. And if your moderation is set to hold everything, your own comment has to be published before it can be pinned.
| Behaviour | What to expect |
|---|---|
| One per video | Pinning a new comment replaces the old one, which returns to its normal position rather than being deleted |
| It notifies | Pinning someone's comment tells them, the same as hearting or replying |
| Mobile hides it | Viewers have to expand the comment section to see it; it isn't in the collapsed teaser |
| Your own counts | You can pin your own comment, which is the normal creator use and what this tool is for |
What we won't do
There is no mode here that writes comments for you to post on other people's videos. YouTube's spam policy prohibits “high-volume, repetitive, or deceptive comments… to drive traffic to or engagement with content”, and the example it gives is precisely the tactic: posting identical or similar “check out my channel” messages across hundreds of videos.
The consequence is a warning, then strikes, and three strikes in 90 days can end the channel. Much of it is caught automatically — posting many comments quickly, or the same comment repeatedly, gets them removed without a human looking. Every tool on this page is for the comment section of a video you own, or for an image that says on its face that it isn't real.
Replies: the frame, not the words
The reply tool does not write your answer. It cannot: an answer to a question about your video is a fact about your video, and a generated one would be a guess wearing your name. What it does is the tedious half — the greeting, the acknowledgement, the shape that turns a blunt sentence into a reply.
You supply the one thing you want to say. It gives you five ways to wrap it: answering, thanking, conceding a correction, disagreeing without a fight, and the short unbothered version for a comment that was written to provoke one.
To be clear about the rules here, since people assume otherwise: YouTube does not prohibit AI-assisted replies in your own comment section. It ships the feature itself, in Studio, trained on your own recent replies. What the policies prohibit is bulk, repetitive or automated posting — the volume, not the drafting. We take a different line from YouTube's own feature by choice rather than by rule: a reply about your video should contain a fact only you have.
| The comment | The reply that works |
|---|---|
| A genuine question | Answer it plainly. This is the reply other viewers read too |
| Praise | Thank them for the specific thing. Effusive reads as automated |
| A correction, and they're right | Say so. Conceding plainly is the cheapest credibility there is |
| A correction, and they're wrong | Disagree with the claim, give your reason once, stop |
| Written to provoke | Short, unbothered, no second round — or nothing at all |
Timestamps, links and formatting
Write 1:45 in a comment and YouTube turns it into a link that jumps
there, which is what makes a pinned comment a workable chapter list when you
forgot to put one in the description. Worth knowing that YouTube documents this
nowhere — it is long-standing, reliable behaviour rather than a promised
feature, so treat the exact format rules as observed rather than guaranteed.
Links are the one to watch. A URL in a comment on a normal video is clickable, provided your channel has advanced features enabled. A URL in a comment on a Short is not — YouTube switched those off to cut spam, so a pinned comment carrying a link on a Short is wasted effort. Mentions and hashtags still work there. Your own links also bypass your own link-holding filter, so a creator's pinned link will not be held for review by the setting meant for other people.
Comments also take a little formatting, and the syntax surprises people because
it is not Markdown: *bold*, _italic_ and
-strikethrough-, each with single characters rather than
doubled ones.
The practical consequence for a Short is that the link has to go somewhere else — the description, or the channel links, or spoken aloud with a name people can search. Pinning it and assuming it works is the failure mode, because nothing tells you it didn't.
If you only need one moment rather than a list, the timestamp link generator makes a link that opens at an exact second and works anywhere, not just in a comment.
What actually earns a reply
The question at the end of a pinned comment does most of the work, and the difference between one that gets answered and one that doesn't is how much it asks of the person answering. “What did you think?” asks them to compose an opinion. “Which of the two starters would you have bet on?” asks them to pick one of two things and takes four words to answer.
The same applies to the answer you are hoping for. A question whose honest reply is “nothing” — “anything I missed?” — usually gets exactly that. Ask about the thing you were least sure of on camera, because that is where people who know more than you will speak up.
How long is too long
You will see “10,000 characters” quoted as the comment limit across the web. We can't stand that up: a maximum certainly exists — YouTube's API rejects an over-long comment with a specific error — but no Google page publishes the number, and the figure in circulation traces back to blogs citing each other rather than to YouTube.
Which is why the counter here counts and doesn't claim a limit. The constraint that actually binds is attention: a pinned comment is read at a glance, above a conversation people came for. Past a thousand characters or so you have written a description and put it in the wrong box.
About the mockup
Comment screenshots make good thumbnails and good slides, and most of the time the comment you want does not exist yet. This renders one as a PNG, in light or dark mode, at the size a thumbnail wants.
It has two limits on purpose. Every image is marked as a mockup, and there is no verified badge. The gap between a design mockup and a fabricated quote attributed to a real person is exactly those two things, and a tool that removed them would mostly be used for the second.
Frequently asked questions
Can it write comments for other people's videos?
No, and that's deliberate. Posting templated comments on videos you don't own is spam under YouTube's Community Guidelines, and the realistic outcome is strikes rather than subscribers.
Can I pin my own comment?
Yes — post it from the channel that owns the video, then pin it. That's the normal way creators use a pinned comment, and it's what this tool is for.
Does it post anything for me?
No. Everything runs in your browser and nothing is sent anywhere. You copy the text and paste it yourself, which also means you read it before it goes out.
Are the replies AI-written?
No. You write the substance and the tool supplies the wrapping. An AI-generated answer about your own video would be a guess with your name on it, and viewers are good at spotting a comment section answered by a machine.
Why can't I pin a comment?
Almost always because advanced features aren't enabled on the channel — that's the gate, not monetisation or subscriber count, and it can take up to 24 hours to take effect. Otherwise: comments are off or paused on the video, or the content is set as made for kids, which disables comments entirely.
What's the maximum length of a YouTube comment?
YouTube doesn't publish one. A limit exists and is enforced, but the 10,000 figure repeated everywhere has no source at Google. For a pinned comment the useful limit is much lower anyway — it's read at a glance, so a few hundred characters does the job.
Will my link work in a pinned comment on a Short?
No. Links in Shorts comments are deliberately non-clickable to reduce spam. Mentions and hashtags still work. On a normal video a link is clickable if your channel has advanced features enabled.
Can I remove the mockup watermark?
Not from here. It's the line between a design mockup and a fake quote attributed to a real person, and the second is the use we're not interested in serving.
Need the chapters for that pinned comment?
Summarize the video and you get a chapter map with real timestamps.
Summarize a video — free