SageThumbs 2k - Browse /v3.0.3 at SourceForge.net

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Name	Modified	Size	InfoDownloads / Week
Parent folder
SageThumbs2K-Setup-3.0.3-amd64.exe	2026-09-12	14.2 MB	0
SageThumbs2K-Setup-3.0.3-amd64.exe.sig	2026-09-12	128 Bytes	0
SageThumbs2K-Portable-3.0.3-arm64.zip	2026-09-12	22.9 MB	0
SageThumbs2K-Portable-3.0.3-arm64.zip.sig	2026-09-12	128 Bytes	0
SageThumbs2K-Portable-3.0.3.zip	2026-09-12	24.7 MB	0
SageThumbs2K-Setup-3.0.3-arm64.exe.sig	2026-09-12	128 Bytes	0
SageThumbs2K-Portable-3.0.3.zip.sig	2026-09-12	128 Bytes	0
SageThumbs2K-Setup-3.0.3-arm64.exe	2026-09-12	12.8 MB	0
SageThumbs2K-Setup-3.0.3.exe	2026-09-12	14.2 MB	0
SageThumbs2K-Setup-3.0.3.exe.sig	2026-09-12	128 Bytes	0
README.md	2026-09-12	5.0 kB	0
SageThumbs 2K 3.0.3 source code.tar.gz	2026-09-12	8.7 MB	0
SageThumbs 2K 3.0.3 source code.zip	2026-09-12	9.3 MB	0
Totals: 13 Items		106.8 MB	0

The HDR fix from 3.0.2 now covers every format that can carry an HDR picture, the doctor explains two more reasons a thumbnail can go missing, and the right-click preview tile is back on its strict size guard.

TL;DR

🔁 Changed

AVIF files without a colour box now use the fast path
The doctor names two more causes of missing thumbnails

🩹 Fixed

HDR HEIC, JPEG XR and TIFF thumbnails show the right brightness
Right-click preview tile is back on its strict size guard

Read more: everything in 3.0.3

- **HDR HEIC, JPEG XR and TIFF thumbnails render at the right brightness.** The 3.0.2 fix for HDR AVIF now has a proven twin for every container that can carry an HDR picture: an HDR HEIC (PQ or HLG) takes the same path as AVIF, a linear-float JPEG XR (what Windows writes for an HDR screenshot) is tone-mapped instead of clipped to white, and a 16-bit TIFF tagged with a PQ profile is converted through the profile's own HDR signal rather than colour-managed into near-black. The TIFF fix also reads a profile the decoder used to drop. - **AVIF files with no colour box take the fast path when the codec measures right**, instead of always going through the bundled ImageMagick, and an AVIF with a gain map or an alpha plane is read by its main picture rather than by whichever colour box came first. - **The right-click menu's preview tile keeps the strict size guard.** The tile that is drawn inside Explorer itself had, since a refactor, been allowed the wider ceiling meant for the isolated thumbnail host; it is back on the strict one, and the test that guards it now actually reaches the codec. - **The doctor names two more causes of a missing thumbnail.** A folder added to This PC by a tweaker is reported, machine-wide and for the probed file (files browsed through such an entry may never show a picture; open the real folder instead), and the per-file section now says whether Explorer ever asked SageThumbs for that file at all, read off the diagnostics log, so "it never reached us" no longer needs a developer to read the log by hand.

Verified installer

File: SageThumbs2K-Setup-3.0.3.exe
Size: 14158304 bytes
SHA-256: 3599c8e7f7930ab776f584a55f17ebc319aa1c79747143b4869f8d413b5f07f6
ARM64 installer: SageThumbs2K-Setup-3.0.3-arm64.exe
ARM64 SHA-256: 73e9d98fdbe59fd12176e091f4b5bc41b105615176682ea89940afe5f0cd360c
x64 installer, second copy: SageThumbs2K-Setup-3.0.3-amd64.exe is the same file as the verified x64 installer above, published under a name that lists first so that copies older than 1.3.6 can update themselves. Download the plain one.

Portable (no installer)

Extract and run. Nothing is installed, nothing goes in the registry, no admin needed. Settings live in SageThumbs2K.ini next to the exe.

You get the app and the command line tool: settings, convert and resize, quick preview, screenshots, OCR, the colour picker and the folder tools.

Explorer thumbnails and the classic right-click menu work too. Turn them on with st2k register, or the button in Settings under Advanced. That registers the handler for your user account only: no installer, no administrator rights, nothing written machine-wide. st2k register --off undoes it, and you should run that before moving or deleting the folder, otherwise Windows is left pointing at a file that has gone.

Three things still need the installer, because Windows only accepts them registered for the whole machine: the Explorer preview pane, the Details pane columns, and the Windows 11 right-click menu (the compact one).

x64 portable: SageThumbs2K-Portable-3.0.3.zip
x64 portable SHA-256: c3967d455be3ac2c42db270c04d9ca987bc9e6323541df0cfd84e592d4ddecd3
arm64 portable: SageThumbs2K-Portable-3.0.3-arm64.zip
arm64 portable SHA-256: a7884e61f629d7508b78452f56c73ed46607359987912965739544af297ee68e

Antivirus / SmartScreen: these builds are code-signed. A brand-new signed file with no download history draws reputation-based warnings. Scan results for these exact bytes: