diff --git a/locales/index.d.ts b/locales/index.d.ts
index da1e522756..dc41c96a96 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -13005,6 +13005,30 @@ export interface Locale extends ILocale {
          */
         "text": string;
     };
+    /**
+     * Test patterns
+     */
+    "wordMuteTestLabel": string;
+    /**
+     * Enter some text here to test your word patterns. The matched words, if any, will be displayed below.
+     */
+    "wordMuteTestDescription": string;
+    /**
+     * Test
+     */
+    "wordMuteTestTest": string;
+    /**
+     * Matched words: {words}
+     */
+    "wordMuteTestMatch": ParameterizedString<"words">;
+    /**
+     * No results yet, enter some text and click "Test" to check it.
+     */
+    "wordMuteTestNoResults": string;
+    /**
+     * Text does not match any patterns.
+     */
+    "wordMuteTestNoMatch": string;
 }
 declare const locales: {
     [lang: string]: Locale;
diff --git a/packages/frontend/src/components/SkPatternTest.vue b/packages/frontend/src/components/SkPatternTest.vue
new file mode 100644
index 0000000000..2ed2b3fdc3
--- /dev/null
+++ b/packages/frontend/src/components/SkPatternTest.vue
@@ -0,0 +1,57 @@
+<!--
+SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkFolder>
+	<template #label>{{ i18n.ts.wordMuteTestLabel }}</template>
+
+	<div class="_gaps">
+		<MkTextarea v-model="testWords">
+			<template #caption>{{ i18n.ts.wordMuteTestDescription }}</template>
+		</MkTextarea>
+		<div><MkButton :disabled="!testWords" @click="testWordMutes">{{ i18n.ts.wordMuteTestTest }}</MkButton></div>
+		<div v-if="testMatches == null">{{ i18n.ts.wordMuteTestNoResults}}</div>
+		<div v-else-if="testMatches === ''">{{ i18n.ts.wordMuteTestNoMatch }}</div>
+		<div v-else>{{ i18n.tsx.wordMuteTestMatch({ words: testMatches }) }}</div>
+	</div>
+</MkFolder>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue';
+import { i18n } from '@/i18n';
+import MkFolder from '@/components/MkFolder.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkTextarea from '@/components/MkTextarea.vue';
+import { parseMutes } from '@/utility/parse-mutes';
+import { checkWordMute } from '@/utility/check-word-mute';
+
+const props = defineProps<{
+	mutedWords?: string | null,
+}>();
+
+const testWords = ref<string | null>(null);
+const testMatches = ref<string | null>(null);
+
+function testWordMutes() {
+	if (!testWords.value || !props.mutedWords) {
+		testMatches.value = null;
+		return;
+	}
+
+	try {
+		const mutes = parseMutes(props.mutedWords);
+		const matches = checkWordMute(testWords.value, null, mutes);
+		testMatches.value = matches ? matches.flat(2).join(', ') : '';
+	} catch {
+		// Error is displayed by above function
+		testMatches.value = null;
+	}
+}
+</script>
+
+<style module lang="scss">
+
+</style>
diff --git a/packages/frontend/src/pages/admin/moderation.vue b/packages/frontend/src/pages/admin/moderation.vue
index 9675bdc21a..6845bd7ad0 100644
--- a/packages/frontend/src/pages/admin/moderation.vue
+++ b/packages/frontend/src/pages/admin/moderation.vue
@@ -47,6 +47,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkTextarea v-model="trustedLinkUrlPatterns">
 							<template #caption>{{ i18n.ts.trustedLinkUrlPatternsDescription }}</template>
 						</MkTextarea>
+
+						<SkPatternTest :mutedWords="trustedLinkUrlPatterns"></SkPatternTest>
+
 						<MkButton primary @click="save_trustedLinkUrlPatterns">{{ i18n.ts.save }}</MkButton>
 					</div>
 				</MkFolder>
@@ -71,6 +74,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkTextarea v-model="sensitiveWords">
 							<template #caption>{{ i18n.ts.sensitiveWordsDescription }}<br>{{ i18n.ts.sensitiveWordsDescription2 }}</template>
 						</MkTextarea>
+
+						<SkPatternTest :mutedWords="sensitiveWords"></SkPatternTest>
+
 						<MkButton primary @click="save_sensitiveWords">{{ i18n.ts.save }}</MkButton>
 					</div>
 				</MkFolder>
@@ -83,6 +89,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkTextarea v-model="prohibitedWords">
 							<template #caption>{{ i18n.ts.prohibitedWordsDescription }}<br>{{ i18n.ts.prohibitedWordsDescription2 }}</template>
 						</MkTextarea>
+
+						<SkPatternTest :mutedWords="prohibitedWords"></SkPatternTest>
+
 						<MkButton primary @click="save_prohibitedWords">{{ i18n.ts.save }}</MkButton>
 					</div>
 				</MkFolder>
@@ -95,6 +104,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkTextarea v-model="prohibitedWordsForNameOfUser">
 							<template #caption>{{ i18n.ts.prohibitedWordsForNameOfUserDescription }}<br>{{ i18n.ts.prohibitedWordsDescription2 }}</template>
 						</MkTextarea>
+
+						<SkPatternTest :mutedWords="prohibitedWordsForNameOfUser"></SkPatternTest>
+
 						<MkButton primary @click="save_prohibitedWordsForNameOfUser">{{ i18n.ts.save }}</MkButton>
 					</div>
 				</MkFolder>
@@ -166,6 +178,7 @@ import { definePage } from '@/page.js';
 import MkButton from '@/components/MkButton.vue';
 import FormLink from '@/components/form/link.vue';
 import MkFolder from '@/components/MkFolder.vue';
+import SkPatternTest from '@/components/SkPatternTest.vue';
 
 const enableRegistration = ref<boolean>(false);
 const emailRequiredForSignup = ref<boolean>(false);
diff --git a/packages/frontend/src/pages/settings/mute-block.word-mute.vue b/packages/frontend/src/pages/settings/mute-block.word-mute.vue
index f5837abe98..36b388b848 100644
--- a/packages/frontend/src/pages/settings/mute-block.word-mute.vue
+++ b/packages/frontend/src/pages/settings/mute-block.word-mute.vue
@@ -11,6 +11,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<template #caption>{{ i18n.ts._wordMute.muteWordsDescription }}<br>{{ i18n.ts._wordMute.muteWordsDescription2 }}</template>
 		</MkTextarea>
 	</div>
+
+	<SkPatternTest :mutedWords="mutedWords"></SkPatternTest>
+
 	<MkButton primary inline :disabled="!changed" @click="save()"><i class="ti ti-device-floppy"></i> {{ i18n.ts.save }}</MkButton>
 </div>
 </template>
@@ -19,8 +22,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { ref, watch } from 'vue';
 import MkTextarea from '@/components/MkTextarea.vue';
 import MkButton from '@/components/MkButton.vue';
-import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
+import { parseMutes } from '@/utility/parse-mutes';
+import SkPatternTest from '@/components/SkPatternTest.vue';
 
 const props = defineProps<{
 	muted: (string[] | string)[];
@@ -30,7 +34,7 @@ const emit = defineEmits<{
 	(ev: 'save', value: (string[] | string)[]): void;
 }>();
 
-const render = (mutedWords) => mutedWords.map(x => {
+const render = (mutedWords: (string | string[])[]) => mutedWords.map(x => {
 	if (Array.isArray(x)) {
 		return x.join(' ');
 	} else {
@@ -46,47 +50,15 @@ watch(mutedWords, () => {
 });
 
 async function save() {
-	const parseMutes = (mutes) => {
-		// split into lines, remove empty lines and unnecessary whitespace
-		let lines = mutes.trim().split('\n').map(line => line.trim()).filter(line => line !== '');
-
-		// check each line if it is a RegExp or not
-		for (let i = 0; i < lines.length; i++) {
-			const line = lines[i];
-			const regexp = line.match(/^\/(.+)\/(.*)$/);
-			if (regexp) {
-				// check that the RegExp is valid
-				try {
-					new RegExp(regexp[1], regexp[2]);
-					// note that regex lines will not be split by spaces!
-				} catch (err: any) {
-					// invalid syntax: do not save, do not reset changed flag
-					os.alert({
-						type: 'error',
-						title: i18n.ts.regexpError,
-						text: i18n.tsx.regexpErrorDescription({ tab: 'word mute', line: i + 1 }) + '\n' + err.toString(),
-					});
-					// re-throw error so these invalid settings are not saved
-					throw err;
-				}
-			} else {
-				lines[i] = line.split(' ');
-			}
-		}
-
-		return lines;
-	};
-
-	let parsed;
 	try {
-		parsed = parseMutes(mutedWords.value);
-	} catch (err) {
+		const parsed = parseMutes(mutedWords.value);
+
+		emit('save', parsed);
+
+		changed.value = false;
+	} catch {
 		// already displayed error message in parseMutes
 		return;
 	}
-
-	emit('save', parsed);
-
-	changed.value = false;
 }
 </script>
diff --git a/packages/frontend/src/utility/check-word-mute.ts b/packages/frontend/src/utility/check-word-mute.ts
index 37ad678555..26bf593f7b 100644
--- a/packages/frontend/src/utility/check-word-mute.ts
+++ b/packages/frontend/src/utility/check-word-mute.ts
@@ -4,12 +4,12 @@
  */
 import * as Misskey from 'misskey-js';
 
-export function checkWordMute(note: Misskey.entities.Note, me: Misskey.entities.UserLite | null | undefined, mutedWords: Array<string | string[]>): Array<string | string[]> | false {
+export function checkWordMute(note: string | Misskey.entities.Note, me: Misskey.entities.UserLite | null | undefined, mutedWords: Array<string | string[]>): Array<string | string[]> | false {
 	// 自分自身
-	if (me && (note.userId === me.id)) return false;
+	if (me && typeof(note) === 'object' && (note.userId === me.id)) return false;
 
 	if (mutedWords.length > 0) {
-		const text = getNoteText(note);
+		const text = typeof(note) === 'object' ? getNoteText(note) : note;
 
 		if (text === '') return false;
 
diff --git a/packages/frontend/src/utility/parse-mutes.ts b/packages/frontend/src/utility/parse-mutes.ts
new file mode 100644
index 0000000000..1ebd5bcf83
--- /dev/null
+++ b/packages/frontend/src/utility/parse-mutes.ts
@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as os from '@/os';
+import { i18n } from '@/i18n';
+
+export type Mutes = (string | string[])[];
+
+export function parseMutes(mutes: string): Mutes {
+	// split into lines, remove empty lines and unnecessary whitespace
+	const lines = mutes.trim().split('\n').map(line => line.trim()).filter(line => line !== '');
+	const outLines: Mutes = Array.from(lines);
+
+	// check each line if it is a RegExp or not
+	for (let i = 0; i < lines.length; i++) {
+		const line = lines[i];
+		const regexp = line.match(/^\/(.+)\/(.*)$/);
+		if (regexp) {
+			// check that the RegExp is valid
+			try {
+				new RegExp(regexp[1], regexp[2]);
+				// note that regex lines will not be split by spaces!
+			} catch (err: any) {
+				// invalid syntax: do not save, do not reset changed flag
+				os.alert({
+					type: 'error',
+					title: i18n.ts.regexpError,
+					text: i18n.tsx.regexpErrorDescription({ tab: 'word mute', line: i + 1 }) + '\n' + err.toString(),
+				});
+				// re-throw error so these invalid settings are not saved
+				throw err;
+			}
+		} else {
+			outLines[i] = line.split(' ');
+		}
+	}
+
+	return outLines;
+}
diff --git a/sharkey-locales/en-US.yml b/sharkey-locales/en-US.yml
index 4869c1ce84..9232a7706c 100644
--- a/sharkey-locales/en-US.yml
+++ b/sharkey-locales/en-US.yml
@@ -552,3 +552,10 @@ enableProxyAccountDescription: "If disabled, then the proxy account will not be
 _confirmPollEdit:
   title: Are you sure you want to edit this poll
   text: Editing this poll will cause it to lose all previous votes
+
+wordMuteTestLabel: "Test patterns"
+wordMuteTestDescription: "Enter some text here to test your word patterns. The matched words, if any, will be displayed below."
+wordMuteTestTest: "Test"
+wordMuteTestMatch: "Matched words: {words}"
+wordMuteTestNoResults: "No results yet, enter some text and click \"Test\" to check it."
+wordMuteTestNoMatch: "Text does not match any patterns."