diff --git a/packages/client/src/hook/useGalleryDoc.ts b/packages/client/src/hook/useGalleryDoc.ts
index 71ee319..0021237 100644
--- a/packages/client/src/hook/useGalleryDoc.ts
+++ b/packages/client/src/hook/useGalleryDoc.ts
@@ -16,6 +16,16 @@ export function useRehashDoc() {
     };
 }
 
+export function useRescanDoc() {
+    const { mutate } = useSWRConfig();
+    return async (id: string) => {
+        await fetch(`/api/doc/${id}/_rescan`, {
+            method: "POST",
+        });
+        mutate(`/api/doc/${id}`);
+    };
+}
+
 export function useGalleryDocSimilar(id: string) {
     return useSWR<Document[]>(`/api/doc/${id}/similars`, fetcher);
 }
\ No newline at end of file
diff --git a/packages/client/src/page/contentInfoPage.tsx b/packages/client/src/page/contentInfoPage.tsx
index 6d60c23..cb1c211 100644
--- a/packages/client/src/page/contentInfoPage.tsx
+++ b/packages/client/src/page/contentInfoPage.tsx
@@ -1,5 +1,5 @@
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
-import { useGalleryDoc, useGalleryDocSimilar, useRehashDoc } from "../hook/useGalleryDoc.ts";
+import { useGalleryDoc, useGalleryDocSimilar, useRehashDoc, useRescanDoc } from "../hook/useGalleryDoc.ts";
 import TagBadge from "@/components/gallery/TagBadge";
 import StyledLink from "@/components/gallery/StyledLink";
 import { Link, useLocation } from "wouter";
@@ -8,6 +8,7 @@ import { DescTagItem, DescItem } from "../components/gallery/DescItem.tsx";
 import { Button } from "@/components/ui/button.tsx";
 import { GalleryCard } from "@/components/gallery/GalleryCard.tsx";
 import { useEffect, useRef } from "react";
+import { useLogin } from "@/state/user.ts";
 
 export interface ContentInfoPageProps {
     params: {
@@ -35,6 +36,10 @@ function Wrapper({ children }: { children: React.ReactNode }) {
 export function ContentInfoPage({ params }: ContentInfoPageProps) {
     const { data, error, isLoading } = useGalleryDoc(params.id);
     const rehashDoc = useRehashDoc();
+    const rescanDoc = useRescanDoc();
+    const user = useLogin();
+    const username = user?.username;
+    const isAdmin = username === "admin";
 
     if (isLoading) {
         return <div className="p-4 flex items-center justify-center h-full">
@@ -69,12 +74,21 @@ export function ContentInfoPage({ params }: ContentInfoPageProps) {
                 </div>
             </Link>
             <Card className="flex-1 relative">
-                <div className="absolute top-0 right-0 p-2">
-                    <Button variant="ghost" onClick={async () => {
-                        // Rehash
-                        await rehashDoc(params.id);
-                    }}>Rehash</Button>
-                </div>
+                {isAdmin &&
+                    <div className="absolute top-0 right-0 p-2 grid">
+                        <Button variant="ghost" onClick={async () => {
+                            // Rehash
+                            await rehashDoc(params.id);
+                        }}>Rehash</Button>
+                        <Button variant="ghost" onClick={async () => {
+                            if (!window.confirm("Are you sure?")) {
+                                return;
+                            }
+                            // Rescan
+                            await rescanDoc(params.id);
+                        }}>Rescan</Button>
+                    </div>
+                }
                 <CardHeader>
                     <CardTitle>
                         <StyledLink to={contentLocation}>
diff --git a/packages/server/src/db/doc.ts b/packages/server/src/db/doc.ts
index 6249c98..d020259 100644
--- a/packages/server/src/db/doc.ts
+++ b/packages/server/src/db/doc.ts
@@ -9,6 +9,8 @@ import type {
 } from "dbtype";
 import type { NotNull } from "kysely";
 import { MyParseJSONResultsPlugin } from "./plugin.ts";
+import { getContentFileConstructor } from "src/content/file.ts";
+import { join } from "path";
 
 type DBDocument = db.Document;
 
@@ -280,6 +282,45 @@ class SqliteDocumentAccessor implements DocumentAccessor {
 			additional: {},
 		}));
 	}
+
+	async rescanDocument(c: Document) {
+		return this.kysely.transaction().execute(async (trx) => {
+			const ContentFile = getContentFileConstructor(c.content_type);
+			if (ContentFile === undefined) {
+				throw new Error(`${c.content_type} is not defined.`);
+			}
+			const path = join(c.basepath, c.filename);
+			const content = new ContentFile(path);
+			const body = await content.createDocumentBody();
+
+			const { tags, ...rest } = body;
+
+			// update document
+			await trx.updateTable("document")
+				.set({
+					...rest,
+					modified_at: Date.now(),
+					additional: JSON.stringify(body.additional),
+				})
+				.where("id", "=", c.id)
+				.execute();
+
+			// delete old tags
+			await trx.deleteFrom("doc_tag_relation")
+				.where("doc_id", "=", c.id)
+				.execute();
+			// update tags and doc_tag_relation
+			await trx.insertInto("tags")
+				.values(tags.map((x) => ({ name: x })))
+				.onConflict((oc) => oc.doNothing())
+				.execute();
+			await trx.insertInto("doc_tag_relation")
+				.values(tags.map((x) => ({ tag_name: x, doc_id: c.id }))
+				)
+				.execute();
+			
+		});
+	}
 }
 export const createSqliteDocumentAccessor = (kysely = getKysely()): DocumentAccessor => {
 	return new SqliteDocumentAccessor(kysely);
diff --git a/packages/server/src/model/doc.ts b/packages/server/src/model/doc.ts
index dd9abab..0758041 100644
--- a/packages/server/src/model/doc.ts
+++ b/packages/server/src/model/doc.ts
@@ -36,6 +36,11 @@ export const isDoc = (c: unknown): c is Document => {
 };
 
 export interface DocumentAccessor {
+	/**
+	 * rescan document
+	 * it will update document's metadata and tags from file.
+	 */
+	rescanDocument(c: Document): Promise<void>;
 	/**
 	 * find list by option
 	 * @returns documents list
diff --git a/packages/server/src/route/contents.ts b/packages/server/src/route/contents.ts
index 03f5296..fdcb12b 100644
--- a/packages/server/src/route/contents.ts
+++ b/packages/server/src/route/contents.ts
@@ -197,6 +197,19 @@ function getSimilarDocumentHandler(controller: DocumentAccessor) {
 	};
 }
 
+function getRescanDocumentHandler(controller: DocumentAccessor) {
+	return async (ctx: Context, next: Next) => {
+		const num = Number.parseInt(ctx.params.num);
+		const c = await controller.findById(num, true);
+		if (c === undefined) {
+			return sendError(404);
+		}
+		await controller.rescanDocument(c);
+		// 204 No Content
+		ctx.status = 204;
+	};
+}
+
 export const getContentRouter = (controller: DocumentAccessor) => {
 	const ret = new Router();
 	ret.get("/search", PerCheck(Per.QueryContent), ContentQueryHandler(controller));
@@ -211,6 +224,7 @@ export const getContentRouter = (controller: DocumentAccessor) => {
 	ret.del("/:num(\\d+)/tags/:tag", PerCheck(Per.ModifyTag), DelTagHandler(controller));
 	ret.use("/:num(\\d+)", PerCheck(Per.QueryContent), new AllContentRouter().routes());
 	ret.post("/:num(\\d+)/_rehash", AdminOnly, RehashContentHandler(controller));
+	ret.post("/:num(\\d+)/_rescan", AdminOnly, getRescanDocumentHandler(controller));
 	return ret;
 };