AVIF Thumbnails Not Showing in Windows Explorer? (2026 Fix)

Short answer: On Windows 10 and 11, Explorer thumbnails and Open with Paint use different code paths. Install AV1 Video Extension and HEIF Image Extensions, clear the thumbnail cache, then retest. If previews still fail, batch-convert to JPG with AVIF to JPG in Chrome or Edge.

You saved .avif files from a website, export, or screenshot tool. Double-click opens them in Paint or FastStone, but the folder in Explorer shows generic icons — no preview strip, no large thumbnails. That is a common Windows quirk in 2026, not proof that the files are corrupt.

Why Explorer thumbnails fail while Paint works

Layer	What it does
Paint / FastStone	Uses app-specific decoders or bundled libraries
Windows Explorer	Shell thumbnail handler + system codecs + thumbcache_*.db
Firefox / Chrome	Native AVIF in the tab (unrelated to Explorer)

A file can decode in one app and still fail the Explorer handler — especially on Windows 10 22H2 with mixed Store codec installs.

Fix checklist (Windows 10 / 11)

1. Microsoft Store — same Windows user as Explorer

   • Install AV1 Video Extension
   • Install HEIF Image Extensions
   • Search for AVIF Image Extension if your build lists it separately

2. Folder Options

   • File Explorer → View → turn off Always show icons, never thumbnails

3. Rebuild thumbnail cache

   • Run Disk Cleanup → check Thumbnails, or
   • Delete %LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*.db
   • Restart Explorer (Task Manager → Windows Explorer → Restart)

4. Test a known-good AVIF

   • Save a sample from an AVIF test page in Firefox
   • Compare with AVIF from your design export — some encoders produce files Paint opens but Explorer rejects

5. Still no thumbnails?

   • Keep originals; convert copies to JPG for folders you browse daily: AVIF to JPG
   • Full Windows walkthrough: Convert AVIF to JPG on Windows

HEIC vs AVIF on Windows

Format	Typical source	Explorer issue
HEIC	iPhone photos	Needs HEIF + often HEVC extensions — see HEIC on Windows
AVIF	Web, CDN, modern exports	Needs AV1 + HEIF stack; thumbnail handler stricter than Paint

Do not install only one codec pack and assume both formats preview. iPhone users with .heic should read What is a HEIC file?, not this page.

Browser-local batch convert (no upload)

When previews are optional and you need JPG for email, Word, or legacy uploaders:

1. Open AVIF to JPG in Chrome or Edge
2. Drop multiple .avif files
3. Adjust JPEG quality (default is fine for sharing)
4. Download individual JPGs or a ZIP

Processing runs locally; image bytes are not uploaded to HeicSave servers for conversion.

When to convert vs when to fix codecs

Goal	Approach
Explorer previews for AVIF archives	Fix Store extensions + thumbnail cache
Email / Outlook / old CMS	Convert to JPG
Mixed HEIC + AVIF from a shoot	HEIC → HEIC to JPG; AVIF → AVIF to JPG

Related guides

• What AVIF is
• Convert AVIF to JPG on Windows
• What is a HEIC file?
• Privacy: browser-local conversion

Convert now: AVIF to JPG · AVIF to PNG

Cite this page

If Windows Explorer shows no AVIF thumbnails but Paint opens the files, install AV1/HEIF extensions, rebuild thumbcache, or convert to JPG. Guide: https://heicsave.com/blog/avif-thumbnails-not-showing-windows-explorer — tool: https://heicsave.com/avif-to-jpg