Reddit Keyword Blacklist: The Complete 2026 Guide

A Reddit keyword blacklist is a list of words a browser extension uses to automatically hide matching posts and comments from your Reddit feed. In May 2026 it requires a third-party extension — Reddit ships no native blacklist. The standard tool is Ultimate Reddit Filter, which matches keywords across post titles, flair, subreddit names, and comment text on both old and new Reddit.

Last verified: May 25, 2026 · Reading time: 10 min

TL;DR

• Reddit has no built-in keyword blacklist as of May 2026 — you need an extension.
• The default recommendation is Ultimate Reddit Filter (free, Chrome + Firefox).
• A good starter blacklist is 15–50 terms, not 500.
• Use substring matching (“trump” catches “trumpism”), not exact matching.
• Comment filtering matters — political subthreads bleed into apolitical posts.
• Copy-paste presets for politics, AITA, crypto, sports, and drama are at the bottom of this page.

What a Reddit keyword blacklist actually is

A keyword blacklist is a list of words or phrases that your browser hides on sight. When you load Reddit, the extension scans every post title (and optionally every comment) and any post whose text matches a term on your list is collapsed, hidden, or relabelled.

What this won’t do:

• It won’t tell Reddit to stop sending you those posts. Reddit’s algorithm doesn’t know you’ve hidden anything.
• It won’t filter the Reddit mobile app — only browsers.
• It won’t catch image-only posts where the topic isn’t in the title.

What it will do, when configured well: turn r/all from a political-and-drama firehose into a usable feed in under five minutes.

The three things every blacklist filters

1. Post titles. The most common axis. “Trump signs executive order” → blocked if trump is on your list.
2. Flair labels. A user-applied tag like [Politics] or [NSFW]. Useful in subreddits that flair posts consistently (r/news, r/worldnews, r/movies).
3. Subreddit names. Block entire communities (r/politics, r/PoliticalDiscussion, r/conservative).

Only one tool — Ultimate Reddit Filter — handles all three plus comments in one extension. The full breakdown is in our best Reddit keyword filter roundup.

Pick a tool first

Tool	Keywords	Flair	Subreddit	Comments	Export
Ultimate Reddit Filter	✓	✓	✓	✓	✓
Reddit Keyword Filter	✓	—	—	—	—
Reddit Enhancement Suite	✓ regex	✓	✓	✓	✓

The rest of this guide assumes Ultimate Reddit Filter. The same principles apply to RES; Reddit Keyword Filter is keyword-only but otherwise identical in concept.

How to build a blacklist that actually works

Step 1 — Start with a preset, not from scratch

Almost no one builds a good blacklist from a blank page. You don’t know your own blind spots. Copy a preset from below, paste it in, and edit from there. We’ll cover the four most common presets.

Step 2 — Use substring matches, not exact words

trump will catch Trump, trumpism, anti-trump, and Trump Jr. donald trump will only catch the exact phrase and will miss Trump signs bill. Always lean toward shorter substring keywords unless you’re getting false positives.

Step 3 — Add the variants you’ll actually see

gop covers “GOP” but not “Republicans.” dem covers “Dems” but also “demographic” — a false positive. Real-world political blacklists include both party names and the figures they revolve around (Trump, Vance, Biden, Harris). See the politics preset below for a working baseline.

Step 4 — Filter the comments too

If you only filter post titles, political subthreads still appear under apolitical posts in r/news or r/worldnews. Ultimate Reddit Filter and RES both have a “filter comments” toggle. Turn it on.

Step 5 — Trim weekly for the first month

Two failure modes to watch for:

• False positives: posts you wanted to see were hidden. (dem hiding demographic, aita hiding wait, crypto hiding cryptographer.) Drop or refine the offending term.
• Misses: posts you didn’t want to see got through. Add the term that should have caught them.

After a month, your list stabilises. After two months, you’ll forget it exists.

Starter presets

Copy any of these into your extension’s keyword field, one term per line. All four have been tested by FeedCutter editors in May 2026.

Politics (US) — block political headlines

trump
maga
gop
dnc
white house
doj
scotus
congress
senate
house gop
vance
harris
biden
election
republican
democrat

Pairs naturally with subreddit blocks for: r/politics, r/PoliticalDiscussion, r/Conservative, r/PoliticalHumor. Full walkthrough: How to block political posts on Reddit.

AITA — block AITA and relationship drama

aita
am i the asshole
wibta
aitah
aitha
relationship
boyfriend
girlfriend
my husband
my wife
my ex

Subreddit blocks: r/AmItheAsshole, r/relationship_advice, r/relationships, r/AITAH. Full walkthrough: How to hide AITA posts on Reddit.

Crypto — block crypto and NFT pumps

crypto
bitcoin
btc
eth
ethereum
nft
defi
web3
solana
coinbase
binance
altcoin
hodl

Subreddit blocks: r/CryptoCurrency, r/Bitcoin, r/ethereum, r/NFT, r/wallstreetbets.

American news — block US-centric news from a non-US perspective

trump
maga
white house
gop
dnc
democrat
republican
texas
florida
california
new york
chicago
us election
united states

Pair with subreddit blocks for: r/news, r/politics, r/USNews. The full walkthrough including non-US news alternatives: How to filter American news from Reddit.

Anti-patterns — what not to do

• Don’t blacklist 500 terms. You’ll start blocking posts you wanted to see, won’t know which term caused it, and will give up.
• Don’t use single common letters. q is not a useful keyword.
• Don’t rely on regex you can’t explain. Power-user mistake; you’ll forget what (?<![a-z])dem(?![a-z]) does in a month.
• Don’t manually maintain duplicates across browsers. Use the export/import feature; otherwise your Chrome and Firefox blocklists will drift.

Maintenance — keeping the list useful

• Quarterly review. Every three months, glance at the list and remove terms that have aged out (a politician who left office, a coin that died).
• Export annually. Save a copy somewhere outside the browser. Extensions occasionally lose data after major updates.
• Sync via export, not copy-paste. Both URF and RES export to a file you can re-import on another machine.

Going further

Once your keyword blacklist is stable, the next layers of Reddit attention control are:

• Subreddit blocking — hide entire communities, not just topics. Add them directly in Ultimate Reddit Filter’s subreddit tab.
• Flair filtering — filter by user-applied tags rather than free text.
• Comment filtering — covered above; non-negotiable for political topics.
• Feed nuking — when no list of keywords will fix it, use News Feed Eradicator to remove the Reddit homepage entirely.

What to do next

1. Install Ultimate Reddit Filter (60 seconds).
2. Paste one of the four starter presets above.
3. Turn on comment filtering in the extension settings.
4. Reload Reddit.

For the full preset pack — every blacklist on this page plus updates as we publish new ones — join the FeedCutter waitlist.