# Thumbn > Thumbn turns a video into click-worthy thumbnails. Paste a YouTube, TikTok or Instagram Reels link — or upload the file — and it watches the footage, finds the most clickable moment, writes the concept, renders every platform size, then scores and re-edits its own work until it clears a quality bar. Thumbn is a web application. The pages below are served as plain Markdown for agents and language models; append the same path to https://thumbn.so/md to fetch any of them. ## Pages - [AI thumbnail generator for YouTube, TikTok and Reels](https://thumbn.so/md): Thumbn turns a video into click-worthy thumbnails. Paste a YouTube, TikTok or Instagram Reels link — or upload the file — and it watches the footage, finds the most clickable moment, writes the concept, renders every platform size, then scores and re-edits its own work until it clears a quality bar. - [How the thumbnail maker works](https://thumbn.so/md/how-it-works): The three steps of a Thumbn run, from video to graded thumbnail. - [Pricing](https://thumbn.so/md/pricing): Plans, credits, and how bringing your own API key changes what you pay. - [Frequently asked questions](https://thumbn.so/md/faq): Common questions about the AI thumbnail generator. - [API & MCP Server for Thumbnail Generation](https://thumbn.so/md/developers): Make YouTube, TikTok and Instagram Reels thumbnails from your own code, or connect Thumbn to Claude, Codex and Cursor over MCP with OAuth. REST API, API keys, and six tools including your choice of image model. - [Thumbnail sizes for YouTube, Reels and TikTok](https://thumbn.so/md/thumbnail-size): Exact dimensions, aspect ratios, file size limits and safe zones, verified against each platform's own documentation. - [The Best AI Thumbnail Generators in 2026, Compared](https://thumbn.so/md/best-ai-thumbnail-generator): A fair comparison of the AI thumbnail generators for YouTube, TikTok and Instagram Reels: Canva, Adobe Express, vidIQ, Pikzels, Thumbmagic and Thumbn. What each is genuinely best at, and which to pick for your situation. - [Thumbn vs Thumbmagic: Which AI Thumbnail Maker Fits You in 2026](https://thumbn.so/md/thumbn-vs-thumbmagic): Thumbn and Thumbmagic compared in detail: how each decides what to make, editing options, multi-platform output, avatars, APIs and free tiers, with clear guidance on which tool fits which creator. - [Thumbn vs Pikzels: Which AI Thumbnail Tool Fits You in 2026](https://thumbn.so/md/thumbn-vs-pikzels): Thumbn and Pikzels compared in detail: prompt and recreate workflows against watching the actual video, Pikzels Score against style-rubric critique, Personas against reference images, credits, APIs and free trials. - [Thumbn vs vidIQ Thumbnail Maker: Which Fits You in 2026](https://thumbn.so/md/thumbn-vs-vidiq): Thumbn and vidIQ's AI thumbnail maker compared in detail: a dedicated multi-platform thumbnail tool against one feature of the best-known YouTube analytics suite, and why already paying for vidIQ changes the answer. - [Thumbn vs Canva for Thumbnails: Which Fits You in 2026](https://thumbn.so/md/thumbn-vs-canva): Thumbn and Canva compared in detail for video thumbnails: a video-watching AI generator against the best manual design editor with over a million templates, Magic Studio AI, brand kits and team collaboration. - [Free thumbnail tools](https://thumbn.so/md/tools): Free tools for creators — thumbnail downloader, preview tester, safe zone checker, resizer and CTR calculator. No account. - [Free YouTube Thumbnail Downloader](https://thumbn.so/md/youtube-thumbnail-downloader): Paste any YouTube link and download its thumbnail in every size YouTube stores for it, up to 1280×720 HD. Free, no account, no watermark, no placeholder images. - [Free YouTube Thumbnail Preview Tool](https://thumbn.so/md/thumbnail-preview): Drop in a thumbnail and see exactly how it looks in the YouTube home feed, sidebar, search results and mobile, in light and dark mode, at true pixel sizes. Free, private, nothing uploaded. - [Free Reels, TikTok & Shorts Safe Zone Checker](https://thumbn.so/md/thumbnail-safe-zones): See exactly where Instagram, TikTok and YouTube Shorts crop and cover your vertical thumbnail. Overlays the 4:5 profile grid crop, the centred safe square and the caption zone. Free, nothing uploaded. - [Free Thumbnail Resizer & Compressor](https://thumbn.so/md/thumbnail-resizer): Resize any image to the exact thumbnail size YouTube, Instagram Reels, TikTok or Shorts needs, and compress it under the file size limit. Free, no signup, nothing uploaded. - [Free YouTube CTR Calculator](https://thumbn.so/md/youtube-ctr-calculator): Enter impressions and views to get your YouTube click-through rate, with honest context on what counts as good and why CTR alone does not decide whether a video succeeds. Free, no signup. - [Free Instagram Video Downloader](https://thumbn.so/md/instagram-video-downloader): Download Instagram Reels and videos in full HD, free, with no watermark and no app. Paste the link, get the MP4. Works on desktop and mobile, no login. - [Free TikTok Video Downloader](https://thumbn.so/md/tiktok-video-downloader): Download TikTok videos without the watermark in full HD. Paste the link, get a clean MP4. Free, no app, no account, works on phone and desktop. - [Free YouTube Video Downloader](https://thumbn.so/md/youtube-video-downloader): Save YouTube content free. Grab thumbnails in full HD instantly, and download supported videos as MP4. No app, no account. Only download what you have rights to. - [Free Instagram Reels Downloader](https://thumbn.so/md/instagram-reels-downloader): Download Instagram Reels in full HD with sound, free and without a watermark. Paste the Reel link, get the MP4. No app, no login, works on any device. - [Free TikTok Downloader Without Watermark](https://thumbn.so/md/tiktok-downloader-no-watermark): Download any TikTok without the watermark, free and in HD. Paste the link, get a clean MP4 you can reuse or edit. No app, no account, works on phone and desktop. - [Free YouTube Shorts Downloader](https://thumbn.so/md/youtube-shorts-downloader): Save YouTube Shorts as HD MP4, free. Paste the Shorts link to download the video where available, or grab its thumbnail instantly. No app, no account. - [Free YouTube to MP4 Converter](https://thumbn.so/md/youtube-to-mp4): Convert YouTube to MP4 free. Download supported videos as MP4 and grab thumbnails in HD instantly. No app, no account. Only convert content you have rights to. - [Free AI Thumbnail Generator](https://thumbn.so/md/ai-thumbnail-generator): Generate a click-worthy thumbnail with AI, free. Describe it, pick a style, and get a YouTube, TikTok or Reels thumbnail in seconds. No design skills, no account for your first one. - [Free YouTube Thumbnail Maker with AI](https://thumbn.so/md/free-youtube-thumbnail-maker): Make a YouTube thumbnail free with AI. Describe it, pick a style, and get a 1280×720 thumbnail in seconds — no Photoshop, no design skills, no account for your first one. - [Free TikTok Thumbnail Maker with AI](https://thumbn.so/md/free-tiktok-thumbnail-maker): Make a TikTok cover with AI, free. Describe it, pick a style, and get a 1080×1920 cover in seconds. No design skills, no account for your first one. - [Free Instagram Reels Thumbnail Maker with AI](https://thumbn.so/md/free-reels-thumbnail-maker): Make an Instagram Reels cover with AI, free. Describe it, pick a style, and get a 1080×1920 cover in seconds. No design skills, no account for your first one. - [Free Podcast Thumbnail Maker with AI](https://thumbn.so/md/podcast-thumbnail-maker): Make a podcast thumbnail with AI, free. Describe your episode, pick a style, and get a click-worthy 1280×720 thumbnail for YouTube and video podcasts in seconds. No design skills. - [YouTube Thumbnail Maker](https://thumbn.so/md/youtube-thumbnail-maker): Make YouTube thumbnails from your video, not a prompt. Thumbn watches the footage, finds the most clickable moment and renders a 1280x720 thumbnail you can keep editing. - [TikTok Thumbnail Maker](https://thumbn.so/md/tiktok-thumbnail-maker): Make TikTok covers from your video. Thumbn watches the footage, finds the strongest frame and renders a 1080x1920 cover you can keep editing. - [Instagram Reels Thumbnail Maker](https://thumbn.so/md/instagram-reels-thumbnail-maker): Make Instagram Reels covers from your video. Thumbn watches the footage, picks the strongest frame and renders a 1080x1920 cover that still works cropped square in your grid. ## Full text - [Everything in one file](https://thumbn.so/llms-full.txt): every public page concatenated as Markdown. ## For agents Thumbn can be driven directly, not just read about. - MCP server (Streamable HTTP, OAuth 2.1): `https://api.thumbn.so/mcp` - Server card: [https://thumbn.so/.well-known/mcp/server-card.json](https://thumbn.so/.well-known/mcp/server-card.json) - Authentication: [https://thumbn.so/auth.md](https://thumbn.so/auth.md) - REST API and tool reference: [https://thumbn.so/md/developers](https://thumbn.so/md/developers) Tools include `create_thumbnail` (watch a YouTube, TikTok or Instagram Reels video and generate thumbnails), `list_image_models`, `estimate_cost` and `get_thumbnail_job`. ## Notes - The application itself (project studio, billing, settings) is behind authentication and is not crawlable. - Thumbn requires an active subscription to generate thumbnails. Plans start at $19/month.