Windows thumbnail extensions for digital archivists in 2026

Compare Windows thumbnail extensions for digital archivists by file format coverage, metadata display, Windows version support, and licence terms.

By 2Dex · 2026-10-13

2Dex is published by the makers of SageThumbs 2K, RēDesign and VectorMagik, which are compared here alongside other tools.

Digital archivists usually choose among these tools by the file formats they must preview, whether metadata has to show in Explorer, which Windows version they run, and which licence terms apply to their work.

Option	Features	Windows versions
SageThumbs 2K	Adds File Explorer thumbnails for 363 file types that Windows cannot render natively, including camera RAW, Photoshop PSD, HEIC/AVIF, and video. ^[1]	Windows 11, with separate installers for x64 and ARM64. ^[1]
Icaros	Provides Windows Explorer thumbnails for essentially any video media format supported by FFmpeg. ^[2]	Windows Vista, Windows 7, Windows 8/8.1, Windows 10, and Windows 11. ^[2]
QuickLook	Provides instant file previews by pressing Space, and supports more than 100 file formats. ^[3] ^[3]	not published
XnView MP	Supports more than 500 image formats, with photo management and image resizing. ^[4] ^[4]	Windows 10 and Windows 11. ^[4]
Seer	Has built-in preview support for PDFs, images, code, video, archives, Markdown, and plugins. ^[5]	not published

What digital archivists need from Windows thumbnail extensions

Digital archivists work with collections that arrive in mixed formats, often from many sources and many years. A thumbnail or preview lets them see what a file holds before they open it, which helps when file names are unclear or inconsistent.

Their work also depends on keeping originals unchanged. A tool that only shows a picture of a file is different from one that edits or converts it, so archivists often look for previews that leave the source file alone. They also need to check formats that Windows cannot show by itself, such as image formats, design files, and video, because a file that cannot be previewed is harder to describe and assess.

Metadata matters too. Dates, camera details, dimensions, and descriptive fields help archivists sort and describe material, so some archivists want that information visible in Explorer rather than in a separate program.

The limits are practical. Tools differ in which formats they cover, which Windows versions they support, and whether they show previews inside File Explorer or in a separate window. Licence terms can matter when an archive or a wider institution is involved, and a tool that suits one collection may not suit another.

SageThumbs 2K for digital archivists

SageThumbs 2K is made by the team that publishes this site. SageThumbs 2K adds File Explorer thumbnails for 363 file types that Windows cannot render natively, including camera RAW, Photoshop PSD, HEIC/AVIF, and video. ^[1] It pulls an embedded preview directly out of design and CAD files such as Photoshop, Affinity, AutoCAD DWG, and CorelDRAW, with no rendering needed. ^[1] It adds image dimensions, EXIF camera details and audio tags to Explorer's Details pane, hover tooltips, and sortable columns for formats Windows cannot read itself. ^[1] Thumbnails also work in OneDrive and Synology Drive folders, and it never downloads online-only files just to draw a thumbnail. ^[1] SageThumbs 2K says a corrupt or malicious file cannot crash File Explorer, because it runs separately from Explorer and reads files in a sandbox. ^[1] The licence is the PolyForm Noncommercial License 1.0.0, and it is source-available. ^[1] It is free for personal, noncommercial use under that licence. ^[1] Commercial use needs a per-installation licence: US$2.99 a month, or US$49 once for a perpetual licence with 12 months of updates. ^[1] Business installs get a 7-day evaluation with every feature, after which thumbnails and previews stop until a licence key is entered. ^[1] It runs on Windows 11, with separate installers for x64 and ARM64. ^[1]

Icaros for digital archivists

Icaros is described as a collection of lightweight, high-quality Windows Shell Extensions. ^[2] Icaros can provide Windows Explorer thumbnails for essentially any video media format supported by FFmpeg. ^[2] It also provides Windows Explorer properties for many popular media filetypes. ^[2] Icaros works on Windows Vista, Windows 7, Windows 8/8.1, Windows 10, and Windows 11. ^[2] Its thumbnailing and properties can be turned on or off. ^[2] The cache can be given a maximum size in megabytes, with zero meaning unlimited. ^[2] Users can also change the default cache location. ^[2]

QuickLook for digital archivists

QuickLook brings a macOS-style Quick Look feature to Windows. ^[3] It provides instant file previews by pressing Space. ^[3] Its supported images include JPEG, PNG, GIF, WebP, and RAW. ^[3] It also covers videos such as MP4, AVI, MKV, and MOV. ^[3] Documents include PDF, Word, Excel, and PowerPoint files. ^[3] Archives such as ZIP, RAR, 7Z, and TAR are included as well. ^[3] Windows versions are not stated on its page.

XnView MP for digital archivists

XnView is described as a free image viewer, photo management, and image resizer software. ^[4] It supports more than 500 image formats. ^[4] It supports EXIF, IPTC, and XMP metadata. ^[4] Its page also lists IPTC and XMP metadata editing. ^[4] It includes batch renaming and a duplicate file finder. ^[4] ^[4] It supports Windows 10 and Windows 11. ^[4]

Seer for digital archivists

Seer was first released on September 28, 2015, and has been continuously updated since. ^[5] It has built-in preview support for PDFs, images, code, video, archives, Markdown, and plugins. ^[5] It stays responsive with very large files. ^[5] You can copy text and content directly from the preview without opening the original app. ^[5] Windows versions are not stated on its page.

Matching the tool to the job

For reviewing a mixed collection in File Explorer, SageThumbs 2K adds thumbnails for camera RAW, Photoshop PSD, HEIC/AVIF, and other formats Windows cannot render natively. ^[1] QuickLook previews RAW images. ^[3]

For design and CAD files that need a preview before they are described, SageThumbs 2K pulls an embedded preview from files such as Photoshop, Affinity, AutoCAD DWG, and CorelDRAW. ^[1]

For folders of video, Icaros can provide Windows Explorer thumbnails for essentially any video media format supported by FFmpeg. ^[2] QuickLook previews MP4, AVI, MKV, and MOV videos. ^[3]

For describing photographs and documents through their metadata, XnView MP supports EXIF, IPTC, and XMP metadata. ^[4] It also includes a duplicate file finder for working through repeated files in a collection. ^[4]

For very large text files and archives, Seer is described as staying responsive. ^[5]

For files that must stay exactly as received, check each tool's own documentation before relying on it, since the facts on this page do not settle that for every option.

For Windows version fit, SageThumbs 2K runs on Windows 11, with separate installers for x64 and ARM64. ^[1] Icaros lists support for Windows Vista, Windows 7, Windows 8/8.1, Windows 10, and Windows 11. ^[2]

Questions to ask before you choose

Which file formats in the collection need previews, and does each candidate tool list them?

Do previews need to appear inside File Explorer, or is a separate preview window acceptable?

Does the collection include design, CAD, or video files that Windows cannot show?

Which Windows version does the workstation run, and does each candidate tool support it?

Will the tool be used for commercial or institutional work, and which licence terms apply to that use?

Does the metadata need to be visible without opening the file?

Frequently asked questions

Which Windows thumbnail extension should archivists check for RAW files?

SageThumbs 2K adds File Explorer thumbnails for camera RAW files and other formats Windows cannot render natively. ^[1] QuickLook lists RAW images among the formats it supports. ^[3] Before a large project starts, archivists should check which RAW camera models each tool handles, since the facts available here do not list them.

Can a Windows thumbnail extension show metadata for archival photos?

SageThumbs 2K adds image dimensions, EXIF camera details and audio tags to Explorer's Details pane, hover tooltips, and sortable columns for formats Windows cannot read itself. ^[1] XnView MP supports EXIF, IPTC, and XMP metadata. ^[4] Archivists should decide whether that information must be visible inside File Explorer or can be read in a separate program, and then compare each option on that point.

Is SageThumbs 2K free for commercial archive work?

It is free for personal, noncommercial use under the PolyForm Noncommercial License 1.0.0. ^[1] Commercial use needs a per-installation licence: US$2.99 a month, or US$49 once for a perpetual licence with 12 months of updates. ^[1] Business installs get a 7-day evaluation with every feature. ^[1]

Do Windows thumbnail extensions work with OneDrive or Synology Drive folders?

Thumbnails also work in OneDrive and Synology Drive folders, and SageThumbs 2K never downloads online-only files just to draw a thumbnail. ^[1] The facts available for the other options do not cover cloud folders, so archivists with synced collections should check how each candidate handles online-only files before relying on it.

What should archivists check before installing a Windows thumbnail extension?

Check the file formats in the collection, the Windows version on the workstation, and whether previews must appear inside File Explorer. SageThumbs 2K runs on Windows 11, with separate installers for x64 and ARM64. ^[1] Icaros lists support for Windows Vista, Windows 7, Windows 8/8.1, Windows 10, and Windows 11. ^[2] Licence terms, cloud folders, and any institutional rules on installing software should also be reviewed first.

It is free for personal, noncommercial use under the PolyForm Noncommercial License 1.0.0. ^[1]

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