diff --git a/src/replace-links/__tests__/replace-links.url.test.ts b/src/replace-links/__tests__/replace-links.url.test.ts
index 8554a16..23eedb6 100644
--- a/src/replace-links/__tests__/replace-links.url.test.ts
+++ b/src/replace-links/__tests__/replace-links.url.test.ts
@@ -44,6 +44,42 @@ describe("ignore url", () => {
 			});
 			expect(result).toBe("- https://x.com/xxxx/status/12345?t=25S02Tda");
 		}
+		{
+			const { candidateMap, trie } = buildCandidateTrieForTest({
+				files: [{ path: "http" }],
+				settings: {
+					restrictNamespace: false,
+					baseDir: undefined,
+				},
+			});
+			const result = await replaceLinks({
+				body: "Hello https://claude.ai/chat/xxx",
+				linkResolverContext: {
+					filePath: "journals/2022-01-01",
+					trie,
+					candidateMap,
+				},
+			});
+			expect(result).toBe("Hello https://claude.ai/chat/xxx");
+		}
+		{
+			const { candidateMap, trie } = buildCandidateTrieForTest({
+				files: [{ path: "http" }],
+				settings: {
+					restrictNamespace: false,
+					baseDir: undefined,
+				},
+			});
+			const result = await replaceLinks({
+				body: "こんにちは https://claude.ai/chat/xxx",
+				linkResolverContext: {
+					filePath: "journals/2022-01-01",
+					trie,
+					candidateMap,
+				},
+			});
+			expect(result).toBe("こんにちは https://claude.ai/chat/xxx");
+		}
 	});
 
 	it("multiple urls", async () => {
diff --git a/src/replace-links/replace-links.ts b/src/replace-links/replace-links.ts
index 21f310c..4957e12 100644
--- a/src/replace-links/replace-links.ts
+++ b/src/replace-links/replace-links.ts
@@ -43,9 +43,9 @@ export const replaceLinks = ({
 		parseInt(candidate, 10) >= 1 &&
 		parseInt(candidate, 10) <= 12;
 
-	// Regex to protect code blocks, inline code, wikilinks, and Markdown links.
+	// Regex to protect code blocks, inline code, wikilinks, Markdown links, and URLs.
 	const protectedRegex =
-		/(```[\s\S]*?```|`[^`]*`|\[\[[^\]]+\]\]|\[[^\]]+\]\([^)]+\))/g;
+		/(```[\s\S]*?```|`[^`]*`|\[\[[^\]]+\]\]|\[[^\]]+\]\([^)]+\)|https?:\/\/[^\s]+)/g;
 
 	// Normalize the body text to NFC.
 	body = body.normalize("NFC");