How to browse large asset folders by thumbnail for graphic designers in 2026

Steps to preview large asset folders as thumbnails in Windows, what to prepare, which options to check, and mistakes to avoid.

By 2Dex · 2026-10-13

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

For a designer, a wall of generic file icons tells you nothing, so start by switching a folder to Large or Extra large icons and making sure thumbnails are not turned off in Folder Options. If design files still show plain icons, install a thumbnail add-on that reads the formats you use. SageThumbs 2K adds File Explorer thumbnails for 363 file types that Windows can't render natively.^[1]

Option	Large asset thumbnails	Personal use	Commercial use
SageThumbs 2K	Adds thumbnails for 363 file types including Photoshop PSD, HEIC/AVIF and video ^[1]	Free for noncommercial use ^[1]	US$2.99 a month, or US$49 once with 12 months of updates ^[1]
Other thumbnail add-ons	Not published	Not published	Not published

What you need before you start

Browsing a large asset folder by thumbnail depends on a few things being ready first. Work through this list before you change anything.

A Windows PC you can change. Some add-ons need administrator rights to install. If your work machine is locked down, look for an option that offers a portable version.
The file types you work with. Write down the extensions in your folders, such as .psd, .ai, .afdesign, .cdr or .dwg. Each tool lists the formats it handles, and you want yours on that list.
Your Windows version and chip type. Find out whether you run Windows 11 and whether the processor is x64 or ARM64, since installers differ by chip.
Your kind of use. Personal hobby work and paid client work are often licensed differently. Decide which applies before you install anything.
A test folder. Pick a folder with a handful of your design files, ideally one file from every program you use. You will check the result there.
A backup of anything irreplaceable. Thumbnail add-ons should only read your files, but a backup costs nothing and removes worry.

Finally, close any open File Explorer windows so you can restart them cleanly after the install.

Step by step

These steps work the same way whichever thumbnail add-on you pick.

Open your test folder and note the current state. Switch the view to Large icons or Extra large icons from the View menu. If you see generic file icons for your design files, thumbnails are missing for those types.
Check that thumbnails are allowed. Open Folder Options, go to the View tab, and make sure the box that says to always show icons and never thumbnails is not ticked. This setting hides thumbnails for every file type, whatever you install.
Pick a thumbnail add-on. Compare the formats each one lists against your own file extensions. Also read its licence terms for personal or commercial use.
Download from the maker's own page. Choose the installer that matches your chip type, x64 or ARM64. If you cannot install software, look for a portable download.
Install it and restart File Explorer. Signing out and back in, or restarting the PC, also works. Windows keeps old thumbnails in a cache, so the first look may still show plain icons.
Open the test folder and give thumbnails a moment to draw. Large asset folders take longer than a small folder of JPEGs.
Clear the thumbnail cache if icons stay plain. Use Disk Cleanup and tick thumbnails, then reopen the folder.
Check each program's file. Open one file from every source, such as a Photoshop PSD, a CorelDRAW file and an AutoCAD DWG. A newer save version can be missing from an older tool until it updates.
Check where the files live. If your assets sit in a synced cloud folder, confirm that thumbnails appear there too, and that the tool does not pull down files you wanted to keep online only.
Look at colour. Compare a thumbnail against the artwork in your design program. Wide-gamut or colour-managed files can look different in a small preview.

Tools that can do it

Facts are published here for only one tool, so the comparison is short. For any other option, such as another thumbnail add-on or file browser, check its own page for the design formats it names, its Windows version support, its licence and whether it needs administrator rights.

### SageThumbs 2K

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 Photoshop PSD, HEIC/AVIF, and video.^[1] For design work, it pulls an embedded preview straight out of design and CAD files such as Photoshop, Affinity, AutoCAD DWG and CorelDRAW, with no rendering needed.^[1] It runs on Windows 11, with separate installers for x64 and ARM64.^[1] You can use a portable zip that needs no admin rights.^[1]

A few other behaviours matter when you browse by thumbnail. Thumbnails also work in OneDrive and Synology Drive folders, and it never downloads online-only files just to draw a thumbnail.^[1] Images carrying an embedded ICC profile or a wide-gamut tag are converted into sRGB before display.^[1] It adds image dimensions and EXIF camera details to Explorer's Details pane, hover tooltips and sortable columns for formats Windows can't read itself.^[1] SageThumbs 2K says a corrupt or malicious file can't crash File Explorer, because it runs separately from Explorer and reads files in a sandbox.^[1] Pressing the Space bar opens an instant preview, on by default unless another Space-bar previewer is installed.^[1] From the right-click menu you can convert, resize, rotate or flip images and combine them into a PDF or CBZ.^[1] Multi-file jobs such as resize, rotate and combine-to-PDF are spread across every CPU core.^[1]

On cost, it is free for personal use that does not involve earning money from it.^[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]

Common mistakes to avoid

Skipping the Folder Options check. If Explorer is set to show icons only, no add-on can bring thumbnails back. Check this setting first.
Judging the result too early. Explorer keeps a thumbnail cache. Restart File Explorer and, if needed, clear the cache before you decide the tool failed.
Installing the wrong build. Match the installer to your chip type. An x64 build on an ARM64 machine, or the reverse, can stop it working.
Ignoring the licence. Free personal terms do not automatically cover paid client work. Read the terms and decide which applies to you before you rely on a tool in a studio.
Testing with only one program. Design programs save files in different ways. Test at least one file from each program you use.
Trusting thumbnail colour for editing. A thumbnail is a quick guide for sorting. Judge colour and sharpness in your design program.
Forgetting synced folders. Check how a tool treats cloud files before pointing it at a folder that holds online-only assets.
Installing several thumbnail tools at once. Two add-ons handling the same format can compete. Remove one before you try another.

Frequently asked questions

Why does File Explorer show plain icons for design files?

Windows can't render many file types natively, and design formats such as PSD and CorelDRAW often need help. Without an add-on that reads those files, Explorer falls back to a generic icon. First check that thumbnails are not turned off in Folder Options, then install a tool that lists the design formats you use.

Does SageThumbs 2K show PSD and CorelDRAW thumbnails?

It adds File Explorer thumbnails for 363 file types that Windows can't render natively, including Photoshop PSD.^[1] It pulls an embedded preview straight out of design and CAD files such as Photoshop, Affinity, AutoCAD DWG and CorelDRAW, with no rendering needed.^[1] Install it, restart File Explorer, switch the folder to a large icon view, and check one file from each program.

Is SageThumbs 2K free for graphic designers?

It is free for personal use that does not involve earning money from it.^[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] The price terms say commercial use needs a paid licence, so read the terms before using it in a studio.^[1]

Can a thumbnail tool be installed without admin rights?

Some tools offer a portable download. SageThumbs 2K lists a portable zip that needs no admin rights.^[1] For any other tool, check its page for a portable option or for the rights its installer asks for before you start on a locked-down work PC.

Will thumbnails download OneDrive assets?

With SageThumbs 2K, thumbnails also work in OneDrive and Synology Drive folders, and it never downloads online-only files just to draw a thumbnail.^[1] For any other tool, check how it treats online-only files before pointing it at a synced asset folder.

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

Try SageThumbs 2K

Sources

SageThumbs 2K's own description of itself (the product of this site's publisher)