diff --git a/fresh.gen.ts b/fresh.gen.ts
index f9ed9e7..8f6e270 100644
--- a/fresh.gen.ts
+++ b/fresh.gen.ts
@@ -12,8 +12,10 @@ import * as $6 from "./routes/api/file/random.ts";
 import * as $7 from "./routes/api/filemeta.ts";
 import * as $8 from "./routes/api/filemeta/[token].ts";
 import * as $9 from "./routes/api/gallery/[gid].ts";
-import * as $10 from "./routes/api/task.ts";
-import * as $11 from "./routes/index.tsx";
+import * as $10 from "./routes/api/status.ts";
+import * as $11 from "./routes/api/task.ts";
+import * as $12 from "./routes/api/thumbnail/[id].ts";
+import * as $13 from "./routes/index.tsx";
 import * as $$0 from "./islands/Container.tsx";
 import * as $$1 from "./islands/Settings.tsx";
 import * as $$2 from "./islands/TaskManager.tsx";
@@ -30,8 +32,10 @@ const manifest = {
         "./routes/api/filemeta.ts": $7,
         "./routes/api/filemeta/[token].ts": $8,
         "./routes/api/gallery/[gid].ts": $9,
-        "./routes/api/task.ts": $10,
-        "./routes/index.tsx": $11,
+        "./routes/api/status.ts": $10,
+        "./routes/api/task.ts": $11,
+        "./routes/api/thumbnail/[id].ts": $12,
+        "./routes/index.tsx": $13,
     },
     islands: {
         "./islands/Container.tsx": $$0,
diff --git a/routes/api/status.ts b/routes/api/status.ts
new file mode 100644
index 0000000..56d2815
--- /dev/null
+++ b/routes/api/status.ts
@@ -0,0 +1,28 @@
+import { Handlers } from "$fresh/server.ts";
+import { get_task_manager } from "../../server.ts";
+import { StatusData } from "../../server/status.ts";
+import { return_data } from "../../server/utils.ts";
+import { check_ffmpeg_binary } from "../../thumbnail/ffmpeg_binary.ts";
+
+export const handler: Handlers = {
+    async GET(_req, _ctx) {
+        const m = get_task_manager();
+        const ffmpeg_binary_enabled = await check_ffmpeg_binary(
+            m.cfg.ffmpeg_path,
+        );
+        const meilisearch_enabled = m.meilisearch !== undefined;
+        const meilisearch = meilisearch_enabled && m.cfg.meili_host &&
+                m.cfg.meili_update_api_key
+            ? {
+                host: m.cfg.meili_host,
+                key: m.cfg.meili_search_api_key ||
+                    m.cfg.meili_update_api_key,
+            }
+            : undefined;
+        return return_data<StatusData>({
+            ffmpeg_binary_enabled,
+            meilisearch_enabled,
+            meilisearch,
+        });
+    },
+};
diff --git a/routes/api/thumbnail/[id].ts b/routes/api/thumbnail/[id].ts
new file mode 100644
index 0000000..d62dcb6
--- /dev/null
+++ b/routes/api/thumbnail/[id].ts
@@ -0,0 +1,80 @@
+import { Handlers } from "$fresh/server.ts";
+import { exists } from "std/fs/exists.ts";
+import { get_task_manager } from "../../../server.ts";
+import { parse_bool, parse_int } from "../../../server/parse_form.ts";
+import { generate_filename, ThumbnailConfig } from "../../../thumbnail/base.ts";
+import { sure_dir } from "../../../utils.ts";
+import { ThumbnailMethod } from "../../../config.ts";
+import { fb_generate_thumbnail } from "../../../thumbnail/ffmpeg_binary.ts";
+import {
+    get_file_response,
+    GetFileResponseOptions,
+} from "../../../server/get_file_response.ts";
+
+export const handler: Handlers = {
+    async GET(req, ctx) {
+        const id = parseInt(ctx.params.id);
+        if (isNaN(id)) {
+            return new Response("Bad Request", { status: 400 });
+        }
+        const m = get_task_manager();
+        const b = m.cfg.thumbnail_dir;
+        const method = m.cfg.thumbnail_method;
+        await sure_dir(b);
+        const f = m.db.get_file(id);
+        if (!f) {
+            return new Response("File not found.", { status: 404 });
+        }
+        const u = new URL(req.url);
+        const max = await parse_int(u.searchParams.get("max"), 1200);
+        const width = await parse_int(u.searchParams.get("width"), null);
+        const height = await parse_int(u.searchParams.get("height"), null);
+        const quality = await parse_int(u.searchParams.get("quality"), 1);
+        const force = await parse_bool(u.searchParams.get("force"), false);
+        const cfg: ThumbnailConfig = { width: 0, height: 0, quality };
+        if (width !== null && height !== null) {
+            cfg.width = width;
+            cfg.height = height;
+        } else if (width !== null) {
+            cfg.width = width;
+            cfg.height = Math.round(f.height / f.width * width);
+        } else if (height !== null) {
+            cfg.height = height;
+            cfg.width = Math.round(f.width / f.height * height);
+        } else {
+            if (f.width > f.height) {
+                cfg.width = max;
+                cfg.height = Math.round(f.height / f.width * max);
+            } else {
+                cfg.height = max;
+                cfg.width = Math.round(f.width / f.height * max);
+            }
+        }
+        if (!force) {
+            if (cfg.width > f.width || cfg.height > f.height) {
+                return Response.redirect(`${u.origin}/api/file/${f.id}`);
+            }
+        }
+        const output = generate_filename(b, f, cfg);
+        if (!(await exists(output))) {
+            if (method === ThumbnailMethod.FFMPEG_BINARY) {
+                const re = await fb_generate_thumbnail(
+                    m.cfg.ffmpeg_path,
+                    f.path,
+                    output,
+                    cfg,
+                );
+                if (!re) {
+                    return new Response("Failed to generate thumbnail.", {
+                        status: 500,
+                    });
+                }
+            }
+        }
+        const opts: GetFileResponseOptions = {};
+        opts.range = req.headers.get("range");
+        opts.if_modified_since = req.headers.get("If-Modified-Since");
+        opts.if_unmodified_since = req.headers.get("If-Unmodified-Since");
+        return await get_file_response(output, opts);
+    },
+};
diff --git a/server/status.ts b/server/status.ts
new file mode 100644
index 0000000..5a88fca
--- /dev/null
+++ b/server/status.ts
@@ -0,0 +1,8 @@
+export type StatusData = {
+    ffmpeg_binary_enabled: boolean;
+    meilisearch_enabled: boolean;
+    meilisearch?: {
+        host: string;
+        key: string;
+    };
+};
diff --git a/thumbnail/base.ts b/thumbnail/base.ts
new file mode 100644
index 0000000..9e1f502
--- /dev/null
+++ b/thumbnail/base.ts
@@ -0,0 +1,22 @@
+import { join } from "std/path/mod.ts";
+import { filterFilename } from "../utils.ts";
+import { EhFile } from "../db.ts";
+
+export type ThumbnailConfig = {
+    width: number;
+    height: number;
+    quality: number;
+};
+
+export function generate_filename(
+    base: string,
+    f: EhFile,
+    cfg: ThumbnailConfig,
+) {
+    return join(
+        base,
+        filterFilename(
+            `${f.id}-${f.token}-${cfg.width}x${cfg.height}-q${cfg.quality}.jpg`,
+        ),
+    );
+}
diff --git a/thumbnail/ffmpeg_binary.ts b/thumbnail/ffmpeg_binary.ts
new file mode 100644
index 0000000..b5f3d82
--- /dev/null
+++ b/thumbnail/ffmpeg_binary.ts
@@ -0,0 +1,43 @@
+import { ThumbnailConfig } from "./base.ts";
+
+export async function check_ffmpeg_binary(p: string) {
+    const cmd = new Deno.Command(p, {
+        stdout: "null",
+        stderr: "null",
+        args: ["-h"],
+    });
+    const c = cmd.spawn();
+    const o = await c.output();
+    return o.code === 0;
+}
+
+export async function fb_generate_thumbnail(
+    p: string,
+    i: string,
+    o: string,
+    cfg: ThumbnailConfig,
+) {
+    const args = [
+        "-i",
+        i,
+        "-vf",
+        `scale=${cfg.width}:${cfg.height}`,
+        "-qmin",
+        `${cfg.quality}`,
+        "-qmax",
+        `${cfg.quality}`,
+        o,
+    ];
+    const cmd = new Deno.Command(p, { args, stdout: "null", stderr: "piped" });
+    const c = cmd.spawn();
+    const s = await c.output();
+    if (s.code !== 0) {
+        try {
+            const d = (new TextDecoder()).decode(s.stderr);
+            console.log(d);
+        } catch (_) {
+            console.log(s.stderr);
+        }
+    }
+    return s.code === 0;
+}