THM is a JPEG with a different extension
A .thm file is a small JPEG thumbnail cameras save next to a photo or video so devices can preview it quickly. Its contents are identical to a JPG — only the extension differs.
Looking to convert WEBP to THM? Here's the honest answer — and what works instead.
Turn your file into a share-worthy AI Effect — one tap, no prompts.
WEBP is a modern Google format using lossy and lossless compression to make images ~25–35% smaller than JPG or PNG at similar quality, with transparency and animation support.
WEBP opens in all modern browsers and recent Photoshop, GIMP and image viewers.
THM is a small JPEG thumbnail saved alongside camera photos and videos — really a JPEG with a different extension.
Rename or convert THM to .jpg to open it anywhere.
Rename it to .jpg, or convert it — it's a JPEG, so any image viewer will then open it.
There's no point: THM is just a camera's JPEG thumbnail. If you need a thumbnail-style image, convert WEBP to JPG.
WEBP converts to JPG, PNG, WEBP, PDF and more — free and instant.