# SageThumbs 2K

> A free, crash-isolated Windows 11 shell extension that adds File Explorer thumbnails for 334 file types Windows can't preview on its own, including camera RAW, Photoshop PSD, HEIC, video, ebooks, comics, 3D-print models and archives. Written in Rust, source-available, with a right-click image toolkit, a spacebar Quick Look preview, and a command-line / MCP tool.

SageThumbs 2K is a modern, clean-room rebuild of the classic SageThumbs by Nikolay Raspopov. It renders thumbnails directly in Windows File Explorer for formats Windows leaves as blank icons, and adds a right-click toolkit plus a console / AI tool. It runs inside explorer.exe but is sandboxed at every boundary with a panic guard on each COM call, so a malformed or hostile file cannot crash Explorer.

## Key facts
- 334 supported formats across 7 categories: Image (202), Document (43), Camera RAW (34), Video (22), Audio (18), Ebook and comics (12), Archive (3).
- Marquee formats: camera RAW (CR2, NEF, ARW, RAF and more), Photoshop PSD and PSB, HEIC, AVIF, JPEG XL, OpenEXR / HDR, DICOM, SVG, video frames (MP4, MKV, MOV, WebM), ebook and comic covers (EPUB, MOBI, CBZ), 3D-print models (STL, OBJ, PLY, rendered and shaded rather than shown as a generic icon), Android app packages (APK, showing the app's real launcher icon), and audio album art and waveforms. Flash video and 10-bit and 12-bit HDR VP9 are decoded by SageThumbs itself, because Windows has no codec for either.
- Free for personal use, source-available under the PolyForm Noncommercial 1.0.0 license. Written in memory-safe Rust. Business and commercial use needs a commercial licence per Windows installation, sold two ways: US$2.99 per month (cancel any time; access ends when you stop paying), or US$49 one-time for a perpetual licence with 12 months of updates. On the one-time plan the app keeps working as it is afterwards; another 12 months of updates is US$29, bought with your key. Security fixes are delivered to every licensed installation regardless. Bought online and redeemed in-app under Settings > Licence.
- Thumbnailing is read-only. A right-click toolkit can convert, resize, rotate, combine to PDF or CBZ, run OCR, pick a colour off the screen, and set wallpaper.
- Screen OCR: drag a region of the screen and the text on it is copied to the clipboard, using Windows' own in-box recognizer (no bundled model). A table in the captured region comes back as a table rather than one run-on line. Reachable from the screenshot editor, the Quick preview toolbar, the tray menu, or a global hotkey.
- Screen capture: drag a region, or point at a window and capture just that window, with an optional delay for shots that need a menu open first. HDR displays are tone-mapped per monitor instead of coming out washed out.
- Press Space in Explorer for a full-size Quick Look preview: video and audio play, code is syntax-highlighted, Markdown renders, PDFs scroll continuously with page thumbnails, zoom and Ctrl+F text search, archives list their contents, SQLite databases (.db, .sqlite) open as browsable tables with their schema, email files (.eml and Outlook .msg) show their headers, message body and attachment list, and 3D models are rendered shaded. Everything is strictly read-only: attachments are listed, never opened or extracted, and no remote content is fetched. Each preview window has its own light/dark button, independent of the app theme.
- Ships an `st2k` command-line tool that also speaks MCP, so an AI agent can view any of the 334 formats as a real image.
- Runs on Windows 11 and Windows 10, 64-bit. Single-file Windows installer.

## Links
- Home: https://sagethumbs.lunarwerx.com/
- Full brief: https://sagethumbs.lunarwerx.com/llms-full.txt
- Pricing (machine-readable): https://sagethumbs.lunarwerx.com/pricing.md
- Buy a commercial licence: https://checkout.connections.icu/licence/24544461-9530-4edb-84e5-4f3471876d98?slug=sagethumbs
- Source code: https://github.com/LunarWerxs/SageThumbs-2k
- Download: https://github.com/LunarWerxs/SageThumbs-2k/releases/latest
- License: https://github.com/LunarWerxs/SageThumbs-2k/blob/main/.github/LICENSE.md