Seer vs XnView MP in 2026

Seer vs XnView MP for designers on Windows, with SageThumbs 2K as a third option for File Explorer thumbnails. Features, pricing and questions to ask.

By 2Dex · 2026-10-11

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

Seer previews PDFs, images, code, video, archives and Markdown files, while XnView MP is a free image viewer, photo manager and image resizer. ^[1] ^[2] SageThumbs 2K adds thumbnails in Windows File Explorer for file types Windows cannot draw itself. ^[3]

Option	Pricing and fees
Seer	Price: not published. Card fee: not published.
XnView MP	Price: free ^[2]. Card fee: not published.
SageThumbs 2K	Personal, noncommercial use: free. ^[3] Commercial use: US$2.99 a month, or US$49 once for a perpetual licence with 12 months of updates. ^[3]

The short answer

Seer gives a designer built-in previews for PDFs, images, code, video, archives, Markdown, and plugins. ^[1] XnView MP is a free image viewer, photo management, and image resizer software. ^[2] SageThumbs 2K adds File Explorer thumbnails for 363 file types that Windows can't render natively, including camera RAW, Photoshop PSD, HEIC/AVIF, and video. ^[3]

For a need to look inside many kinds of files, Seer's page lists that support. ^[1] For a need to view, organise and resize images, XnView MP's page describes that. ^[2] For a need to see thumbnails of design files while browsing folders in Windows, SageThumbs 2K adds Explorer thumbnails for 363 file types, including PSD and RAW. ^[3]

What Seer and XnView MP are built for

Seer's page says it has built-in support for PDFs, images, code, video, archives, Markdown, and plugins. ^[1] For anything beyond that list, check Seer's own site.

XnView MP's page calls it a free image viewer, photo management, and image resizer software. ^[2] It lists IPTC and XMP metadata editing. ^[2] It says it supports more than 500 image formats. ^[2] It says it can export to about 70 different file formats. ^[2] It lists image comparison of up to 4 images side by side. ^[2] It also lists a batch convert tool for changing many images at once. ^[2]

What SageThumbs 2K is built for

SageThumbs 2K is made by the team that publishes this site. It adds File Explorer thumbnails for 363 file types that Windows can't render natively, including camera RAW, Photoshop PSD, HEIC/AVIF, and video. ^[3] For design and CAD files such as Photoshop, Affinity, AutoCAD DWG, and CorelDRAW, SageThumbs 2K uses the small preview picture already saved inside the file, so the file does not have to be redrawn. ^[3]

Thumbnails also work in OneDrive and Synology Drive folders, and it never downloads online-only files just to draw a thumbnail. ^[3] It adds image dimensions, EXIF camera details and audio tags to Explorer's Details pane, hover tooltips, and sortable columns for formats Windows can't read itself. ^[3]

From the right-click menu you can convert images, resize them, rotate or flip them losslessly, and combine images into a PDF or CBZ. ^[3] Images carrying an embedded ICC profile or wide-gamut tag (Display P3 / Adobe RGB) are converted into sRGB before display. ^[3]

Pricing and fees

Seer's price is not published in the facts available for this page, so check its own site before deciding.

XnView MP's page describes it as a free image viewer, photo management, and image resizer software. ^[2] A card fee and a paid tier for it are not published.

SageThumbs 2K is free for personal, noncommercial use under the PolyForm Noncommercial License 1.0.0. ^[3] 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. ^[3] Business installs get a 7-day evaluation with every feature, after which thumbnails and previews stop until a licence key is entered. ^[3] No card fee is published for any of these.

Getting started and everyday use

Seer's facts say only that it has built-in support for PDFs, images, code, video, archives, Markdown, and plugins, so install steps and daily habits are worth checking on its own pages. ^[1]

It supports Windows 10 and Windows 11. ^[2] The same page also lists macOS and Linux. ^[2] In daily use it is described as an image viewer with photo management and image resizing. ^[2]

It runs on Windows 11, with separate installers for the two kinds of processor, x64 and ARM64. ^[3] You can use a version that runs from an unpacked folder and needs no administrator permission to set up. ^[3] Day to day, its thumbnails appear in Explorer, and the right-click menu offers conversion and resizing. ^[3] ^[3] The right-click menu can be trimmed, reordered and regrouped by dragging. ^[3] Multi-file jobs such as resize, rotate, strip and combine-to-PDF are spread across every CPU core. ^[3]

Things to check before you choose

Which file types do you open every week, and does the tool's own page name them? Seer's page lists a set of preview types, and XnView MP's page lists image handling features. ^[1] ^[2]

Do you need thumbnails while browsing folders, or a window to open files in? SageThumbs 2K adds Explorer thumbnails for 363 file types, including design, RAW and video. ^[3]

Which Windows version do you run, and is it listed? SageThumbs 2K lists Windows 11, so check the Windows version any other tool supports. ^[3]

Will the work be commercial? SageThumbs 2K is free for personal use ^[3]; commercial use is US$2.99 a month or US$49 once ^[3]. XnView MP is described as free ^[2], and Seer's price is not published.

Does metadata matter to you? XnView MP lists IPTC and XMP metadata editing. ^[2]

How to choose

If you need to look inside PDFs, code, video, archives or Markdown files, Seer's page lists built-in support for them. ^[1]

If you need an image viewer with photo management, resizing or batch conversion, XnView MP's pages list those. ^[2] ^[2]

If you need thumbnails for camera RAW, Photoshop, Affinity, AutoCAD DWG or CorelDRAW files in File Explorer, SageThumbs 2K adds Explorer thumbnails for 363 file types, including design, RAW and video. ^[3] ^[3]

If you need right-click conversion of images, SageThumbs 2K lists it. ^[3]

Frequently asked questions

What file types does Seer preview?

Seer's page says it has built-in support for PDFs, images, code, video, archives, Markdown, and plugins. ^[1] The facts available here do not give more detail, so a designer should compare that list with the files used each week and check Seer's own pages for anything else.

Is XnView MP an image viewer or an image manager?

XnView MP's page describes it as a free image viewer, photo management, and image resizer software. ^[2] It also lists comparing up to 4 images side by side and a batch convert tool for changing many images at once. ^[2] ^[2]

How many file formats does XnView MP support?

XnView MP's page says it supports more than 500 image formats. ^[2] It also says it can export to about 70 different file formats. ^[2] A designer should compare those lists with the file types used each week and check the XnView pages for any format that matters.

Does SageThumbs 2K show thumbnails for Photoshop and CAD files?

SageThumbs 2K adds File Explorer thumbnails for 363 file types that Windows can't render natively, including camera RAW, Photoshop PSD, HEIC/AVIF, and video. ^[3] It pulls an embedded preview directly out of design and CAD files such as Photoshop, Affinity, AutoCAD DWG, and CorelDRAW. ^[3]

How much does SageThumbs 2K cost?

SageThumbs 2K is free for personal, noncommercial use under the PolyForm Noncommercial License 1.0.0. ^[3] 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. ^[3] SageThumbs 2K business installs get a 7-day evaluation with every feature, after which thumbnails and previews stop until a licence key is entered. ^[3]

It is free for personal, noncommercial use under the PolyForm Noncommercial License 1.0.0. ^[3]

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