diff --git a/src/components/modals/add-source-form.tsx b/src/components/modals/add-source-form.tsx
index 2bfe104..1e8dd3b 100644
--- a/src/components/modals/add-source-form.tsx
+++ b/src/components/modals/add-source-form.tsx
@@ -29,6 +29,7 @@ const CONTENT_TYPE_BY_SOURCE: Partial<Record<SourceType, string>> = {
   [SOURCE_TYPES.YOUTUBE_SHORT]: "audio_video",
   [SOURCE_TYPES.WEB_PAGE]: "webpage",
   [SOURCE_TYPES.DOCUMENT]: "document",
+  [SOURCE_TYPES.ARXIV_PAPER]: "arxiv_paper",
 }
 
 const IN_PROGRESS_STATUSES = ["in_progress", "running", "pending"]
diff --git a/src/lib/__tests__/source-detection.test.ts b/src/lib/__tests__/source-detection.test.ts
index df3a0ef..44e87a8 100644
--- a/src/lib/__tests__/source-detection.test.ts
+++ b/src/lib/__tests__/source-detection.test.ts
@@ -105,4 +105,22 @@ describe("detectSourceType", () => {
       })
     })
   })
+
+  describe("arXiv Paper URLs", () => {
+    it("detects arxiv.org/abs/<id> as ARXIV_PAPER", async () => {
+      expect(await detectSourceType("https://arxiv.org/abs/2301.00001")).toBe(SOURCE_TYPES.ARXIV_PAPER)
+    })
+
+    it("detects arxiv.org/pdf/<id> as ARXIV_PAPER", async () => {
+      expect(await detectSourceType("https://arxiv.org/pdf/2301.00001")).toBe(SOURCE_TYPES.ARXIV_PAPER)
+    })
+
+    it("detects arxiv.org/abs/<id> with http as ARXIV_PAPER", async () => {
+      expect(await detectSourceType("http://arxiv.org/abs/2301.00001")).toBe(SOURCE_TYPES.ARXIV_PAPER)
+    })
+
+    it("does NOT detect a non-arXiv HTTPS URL as ARXIV_PAPER (regression guard)", async () => {
+      expect(await detectSourceType("https://example.com/paper")).toBe(SOURCE_TYPES.WEB_PAGE)
+    })
+  })
 })
diff --git a/src/lib/source-detection.ts b/src/lib/source-detection.ts
index c069c36..4d66cf6 100644
--- a/src/lib/source-detection.ts
+++ b/src/lib/source-detection.ts
@@ -10,6 +10,7 @@ export const SOURCE_TYPES = {
   WEB_PAGE: "web_page",
   DOCUMENT: "document",
   LINK: "link",
+  ARXIV_PAPER: "arxiv_paper",
 } as const
 
 export type SourceType = (typeof SOURCE_TYPES)[keyof typeof SOURCE_TYPES]
@@ -36,6 +37,7 @@ const rssRegex =
 const youtubeChannelPattern =
   /https?:\/\/(www\.)?youtube\.com\/(user\/)?(@)?([\w-]+)/
 const githubRepoPattern = /https:\/\/github\.com\/[\w-]+\/[\w-]+/
+const arxivPattern = /https?:\/\/arxiv\.org\/(abs|pdf)\/[\d.]+/
 const genericUrlRegex = /^(https?|ftp):\/\/[^\s/$.?#].[^\s]*$/
 
 async function checkIfRSS(url: string): Promise<boolean> {
@@ -71,6 +73,7 @@ export async function detectSourceType(source: string): Promise<SourceType> {
   if (twitterHandlePattern.test(source)) return SOURCE_TYPES.TWITTER_HANDLE
   if (rssRegex.test(source)) return SOURCE_TYPES.RSS
   if (githubRepoPattern.test(source)) return SOURCE_TYPES.GITHUB_REPOSITORY
+  if (arxivPattern.test(source)) return SOURCE_TYPES.ARXIV_PAPER
 
   if (genericUrlRegex.test(source)) {
     const isRSS = await checkIfRSS(source)
@@ -105,6 +108,7 @@ export const SOURCE_TYPE_LABELS: Record<string, string> = {
   [SOURCE_TYPES.WEB_PAGE]: "Web Page",
   [SOURCE_TYPES.DOCUMENT]: "Document",
   [SOURCE_TYPES.LINK]: "Link",
+  [SOURCE_TYPES.ARXIV_PAPER]: "arXiv Paper",
 }
 
 const SUBSCRIPTION_TYPES: string[] = [