HEIC Thumbnails Not Showing in Windows 11? Here's the Fix

By Daniel · Updated July 2, 2026 · Independent guide

You copy a fresh batch of iPhone photos over to your Windows 11 PC, open the folder, and instead of a nice grid of previews you get rows of identical blank icons. The photos are there. They even open when you double-click them. But File Explorer refuses to show you what any of them look like, which turns “find the photo of the receipt” into a guessing game.

I’ve dealt with this on multiple Windows 11 machines, and the cause is usually one of four things. This guide walks through all of them in the order I’d actually try, plus the shortcut I use when I don’t feel like fighting Windows codecs at all.

One quick scope check first, because there are two related problems that get mixed up with this one. If your HEIC files won’t open at all when you double-click them, that’s a missing-codec problem with its own set of fixes, and I’ve covered it separately in HEIC file won’t open on Windows. And if you’re new to the format and want the full walkthrough of viewing, opening, and converting on this OS, start with how to open HEIC on Windows 11. This page is only about one specific annoyance: the files open fine, but Explorer shows generic icons instead of photo previews.

Why Windows 11 shows blank icons instead of HEIC previews

File Explorer doesn’t draw thumbnails by magic. For every image format, it needs a decoder it can call to render a small preview, and it stores the results in a cache so folders load fast. HEIC can break this chain in more places than most formats.

In practice, the cause is almost always one of these four:

• The HEIF Image Extensions are missing or broken. This is the Microsoft Store component that teaches Windows to read the HEIC container. Without it, Explorer has no idea what’s inside the file.
• The HEVC codec is missing. iPhone photos are compressed with HEVC (H.265) inside the HEIC container. The HEIF extension alone reads the container but can’t decode the actual image, so you get no preview even though Windows recognizes the file type.
• The thumbnail cache is corrupted. Windows caches previews in database files. When those get damaged, Explorer keeps serving stale blanks even after everything else is fixed.
• An Explorer setting is turning thumbnails off. There’s a checkbox called “Always show icons, never thumbnails” that does exactly what it says, for every file type. It gets flipped by “PC optimizer” tools more often than you’d think.

There’s also a half-installed state that confuses everyone: the Photos app opens your HEIC files fine, but Explorer still shows blank icons. That usually means the codecs are partially working and the cache is holding onto old failures, which is why the cache step below matters.

Fix 1: Verify or reinstall the HEIF Image Extensions

Start here, because nothing else works without the decoder.

1. Open Settings > Apps > Installed apps.
2. Type HEIF in the search box. You’re looking for HEIF Image Extensions.
3. If it’s missing, install it free from the HEIF Image Extension page on the Microsoft Store.
4. If it’s listed but thumbnails are still blank, uninstall it (three-dot menu > Uninstall), then reinstall it fresh from the Store. A broken install looks identical to a working one in this list.
5. For iPhone photos, also check for HEVC Video Extensions. This is the piece that decodes the actual image data, and Microsoft charges about $0.99 for HEVC Video Extensions in the Store. Yes, it says “Video,” and yes, you need it for photos.
6. Restart File Explorer: press Ctrl + Shift + Esc to open Task Manager, find Windows Explorer, and click Restart. A full reboot works too and is occasionally needed before the extensions kick in.

A note from experience: the free “HEVC Video Extensions from Device Manufacturer” listing that used to be the standard workaround has become very hard to find, and its availability comes and goes. If paying a dollar for a codec annoys you, skip ahead to Fix 4, which costs nothing.

Fix 2: Check the Explorer setting that kills thumbnails

This one takes thirty seconds and is worth ruling out before you touch anything deeper. If every file type in the folder shows a plain icon, not just HEIC, this is very likely your culprit.

1. Open File Explorer and click the three dots in the toolbar, then Options.
2. Go to the View tab.
3. Find Always show icons, never thumbnails and make sure it’s unchecked.
4. Click Apply, then OK.

While you’re in there, two more view-related things to check:

• Make sure the folder view is set to Medium icons or larger (View > Large icons is my go-to for photo folders). The List and Details views show tiny generic icons for everything, which people sometimes mistake for broken thumbnails.
• If the PC has ever been put into a “best performance” visual mode, search Start for Adjust the appearance and performance of Windows and confirm Show thumbnails instead of icons is ticked.

Fix 3: Clear the thumbnail cache

If the extensions are installed and the settings are right but you still see blank icons, the cache itself is the problem. Windows won’t regenerate a thumbnail it thinks it already has. Clearing the cache forces a rebuild, and the built-in Disk Cleanup tool handles it safely:

1. Press Start, type Disk Cleanup, and open it.
2. Pick your C: drive if it asks.
3. In the list of files to delete, check Thumbnails. You can uncheck everything else.
4. Click OK, then Delete Files.
5. Restart File Explorer (Task Manager > Windows Explorer > Restart) and reopen your photo folder.

One trick that helps the rebuild along: open the folder in Details view first, then switch back to Large icons. That nudges Explorer into regenerating previews for everything in the folder instead of trusting leftovers.

And to be clear, clearing the cache doesn’t touch your actual photos. It only deletes the small preview images Windows had stored, and those get rebuilt automatically as you browse.

Fix 4: Convert the folder to JPG, and thumbnails just work

Here’s the honest truth after going through the codec dance more times than I’d like: HEIC thumbnail support on Windows is fragile. A feature update can knock the extensions out. IT policies block the Store on plenty of work machines. And the paid codec sometimes half-installs and leaves you exactly where you started.

JPG has none of these problems. Every Windows PC draws JPG thumbnails instantly with nothing installed. So when I want a photo folder that behaves permanently, I convert it:

1. Open SnapHEIC’s HEIC to JPG converter in any browser.
2. Drag in the whole batch. Hundreds of files at once are fine.
3. Download the results individually or as a single ZIP.
4. Drop the JPGs into your folder. Explorer draws every preview immediately, no codecs involved.

It’s free and unlimited, and the conversion runs entirely in your browser, so your photos never upload to a server. If you want to verify that yourself, open your browser’s Network tab while converting, or switch on airplane mode; it keeps working. The converter also strips EXIF/GPS metadata, so photos you later share won’t carry your location. You can read exactly how the in-browser conversion works if the privacy details matter to you.

For a big library, I’ve written up the full workflow in how to batch convert HEIC to JPG, including how to keep the originals organized while you switch over.

Just need to see the photos right now? Skip the fixes

Sometimes you don’t want to repair Windows, you just want to find one photo in a folder of two hundred blank icons. For that, drop the files into the HEIC viewer. It renders previews of everything instantly in the browser, with no install, no admin rights, and no conversion. Like the converter, it runs locally, so nothing leaves your machine.

It won’t fix Explorer’s thumbnails, but as a “let me just see them” tool it beats any codec repair for speed. On a locked-down work laptop it’s often the only option that works at all.

Which fix should you try first?

The bottom line

Blank HEIC icons in Windows 11 come down to a short list of causes: missing HEIF/HEVC extensions, a flipped Explorer setting, a corrupted thumbnail cache, or some combination of them. Run through the fixes in order and one of them will almost certainly bring your previews back.

And if you’d rather not depend on codecs that a Windows update can quietly break, convert the folder to JPG once and the problem is gone for good, or keep the browser viewer bookmarked for whenever you need a quick look. Both are free, both run entirely on your device, and neither will ever show you a blank icon.