How to Filter Reddit Comments by Keyword (Not Just Posts)

Most Reddit filter extensions only hide posts — not comments. Ultimate Reddit Filter and Reddit Enhancement Suite both support comment text filtering. In Ultimate Reddit Filter: click the icon → Settings → enable "Filter comments" → your keyword list applies to comment bodies immediately. Matched comments are hidden inline; the thread stays intact.

Last verified: May 2026 · Reading time: 4 min · Time to set up: 4 minutes

TL;DR

• Most Reddit extensions (including Reddit Keyword Filter) filter post titles only — not comment text.
• Ultimate Reddit Filter supports comment filtering via a Settings toggle. Free.
• Reddit Enhancement Suite supports comment filtering via filterline rules — but RES is in maintenance mode.
• Comment filtering is visual and client-side — it doesn’t affect Reddit search or reply counts.
• Doesn’t work in the official Reddit app — use Kiwi Browser (Android) or Orion (iOS).

---

Which extensions support comment filtering?

Not all Reddit filters filter comments. Here’s the breakdown as of May 2026:

Extension	Post filtering	Comment filtering	Status
Ultimate Reddit Filter	✅	✅ (opt-in)	Active
Reddit Enhancement Suite	✅	✅ (filterline)	Maintenance mode
Reddit Keyword Filter	✅	❌	Active

If you installed Reddit Keyword Filter expecting comment filtering, it won’t work — switch to Ultimate Reddit Filter.

---

How to enable comment filtering in Ultimate Reddit Filter

Step 1 — Install the extension

Install from the Chrome Web Store — also available for Firefox.

Step 2 — Enable comment filtering in Settings

Click the Ultimate Reddit Filter icon in your browser toolbar. Navigate to the Settings tab. Find the Filter comments toggle and switch it on.

By default, URF only filters post titles. The Settings toggle extends the same keyword list to comment bodies.

Step 3 — Add your keywords

Open the Keywords tab. Add the terms you want filtered from comments, one per line. The same keywords apply to both post titles and comment text — there’s no separate list for each.

If you already have a keyword list configured for post filtering, those keywords immediately apply to comments once you enable the toggle. No additional setup required.

Step 4 — Verify in a thread

Navigate to a Reddit thread where you expect comment matches. Filtered comments should appear collapsed or hidden. You can click on a hidden comment to reveal it if you want to read it.

---

How comment filtering behaves

What gets hidden: The comment body text. If your keyword appears anywhere in a comment — top-level comment, reply, or deeply nested response — the comment is hidden.

What stays visible: The thread structure, reply counts, and comment score remain unchanged. Other users’ comments are unaffected. The post itself is unaffected unless its title also matches a keyword.

Revealing a filtered comment: URF doesn’t permanently delete comments from your view. A hidden comment is collapsed and can be expanded by clicking on it — useful if you want to verify a filter is working correctly or check context.

Performance: Comment filtering adds a small processing step per comment on a thread page. For threads with hundreds of comments, there may be a brief scan delay of 10–50ms. Not noticeable in practice.

---

Comment filtering in Reddit Enhancement Suite

RES supports comment filtering through its filterline feature. The syntax for filtering a comment containing a keyword:

body:keyword

To filter comments in a specific subreddit:

subreddit:subredditname body:keyword

RES filterline rules are powerful but require manual syntax. URF’s toggle is easier for most users. The relevant tradeoff: URF is actively maintained, while RES has been in maintenance mode since 2022 with no new features.

See Reddit Enhancement Suite alternatives for the full picture on RES’s current status.

---

When comment filtering is and isn’t useful

Good uses for comment filtering:

• Hiding specific political terms from all threads, not just political posts
• Filtering spoilers when someone posts them as a comment on an unrelated thread
• Removing repetitive meme phrases that dominate comment sections in certain subreddits
• Filtering a topic you’re burned out on even when it appears tangentially in discussion

When post filtering is enough:

• You want to avoid specific topics entirely — hiding the post also hides the comments
• Your keywords are specific enough that only relevant posts match
• Comment threads in your subreddits stay on-topic and the problem is the posts themselves

The two approaches stack. Most users who enable comment filtering already have post filtering active — comment filtering adds coverage for cases where a post slips through (non-obvious title) but the comment thread reveals the topic.

---

Mobile: comment filtering on Android and iOS

Comment filtering doesn’t work in the official Reddit app — browser extensions run in browsers, not native apps. To get comment filtering on mobile:

Android: Install Kiwi Browser + Ultimate Reddit Filter. Enable comment filtering in Settings inside Kiwi. Works identically to desktop.

iOS: Install Orion Browser + Ultimate Reddit Filter. Same process.

For full mobile setup, see How to Filter Reddit on Mobile.