What is a .THM file?
THM is a small JPEG thumbnail that cameras save alongside videos or RAW photos.
- Did you know
- A THM file is really just a JPEG preview the camera writes next to the main file.
- A THM file is a complete JPEG saved under a different extension; renaming it to .jpg lets any image viewer open it with no conversion.
- Cameras give the THM the same base filename as its video or raw file, which is how software pairs the thumbnail with the correct clip.
- Despite being a tiny preview, a THM usually carries full EXIF metadata recording the exposure, lens and camera settings of the original shot.
- Canon camcorders and DSLRs are especially associated with THM files, writing one automatically beside each recorded movie.
- What Analyser shows you
- View EXIF, GPS, camera settings, histograms, dominant colours, OCR text, and AI-generation markers in JPG, PNG, HEIC, WebP, GIF, BMP, TIFF, AVIF and JPEG XL images. Detects computational-photo wrappers (Apple Live Photo, Google and Samsung Motion Photo, Ultra HDR gain maps), opens THM movie-thumbnail files, and extracts every embedded image from multi-image files - all sizes in an ICO, both halves of an MPO stereo pair, and every page of a multi-page TIFF.
- Open a .THM file
- Drag a .THM file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.