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.thm

THM file: what it is and how to open it

A .thm file is a thumbnail your camera saves next to each video (Canon, GoPro, Sony and others) so its playback menu can show a preview.

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Contenta Converter results screen showing 32 converted photos and a before and after preview
The results screen of Contenta Converter: 32 photos converted in 47 seconds, with a before and after preview.
  1. Add your THM filesDrop in single files or a whole folder.
  2. Pick output formatJPG, PNG, TIFF, PDF and more.
  3. Click ConvertEvery file converted in one pass.

The same photo, five outputs

Photo of a stage set with a bed, a small table and a checked sofaDSC_0001.NEF · 3900×2613
  • PNG.png1.9 s
    16.1 MB
  • AVIF.avif2.2 s
    2.02 MB
  • JPG.jpg1.7 s
    1.69 MB
  • WebP.webp1.7 s
    1.32 MB
  • JPEG XL.jxl1.7 s
    1.12 MB
One Nikon D60 RAW file converted to five formats, at quality 90 where the format has a quality setting. PNG is lossless, so it is the largest. Seconds are the median of three runs. Measured with the Contenta Converter 9.0.35 command line on an AMD Ryzen 9 3900X, 2026-09-30.

Most THM files are ordinary JPEG images of 160×120 to 640×480 pixels: rename one to .jpg and Windows Photos opens it. It is only a preview; the footage stays in the video file.

How to open a .THM file on Windows

  1. Rename it to .jpg (free). In File Explorer, change the extension from .thm to .jpg and double-click. Works for most cameras, because the file already is a JPEG.
  2. Rename a whole folder (free). Copy the folder first, then run ren *.thm *.jpg in Command Prompt inside the copy. The camera pairs previews by name, so keep the originals.
  3. Contenta Converter, for many folders. Drop the DCIM folder, pick JPG or PNG, and every .thm is converted in one pass, resized or renamed if you like. The originals stay untouched.
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Formát

THM

Popis The THM souborový formát je v podstatě totožný s Formát souboru JPEG (JFIF).
Výhody slouží k ukládání miniatury pro rychlý náhled
Nevýhody Low resolution (previews only, not the original footage). Most image viewers and social platforms reject the .thm extension without conversion. Nothing in the preview was editable — the real media sits in the paired video file.

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Testimonials:

"V potřeba převést tyto obrázky dnes byl reliéf najít software. Díky!"
Jason Hoffman, CA

"I RAWS střílet každý den, a já rád vaše převodník. To opravdu šetří čas."
Jim Richardson, Indianapolis

"Musím říct, že jsem hledal na fotografii převodníky a Vy je čisté, jednoduché a strašně dobré."
Brandon Keegan, NY

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JK Imaging, Ltd.EASTMAN KODAK COMPANYCanon
NikonSONYSAMSUNG
GENERAL IMAGING CO.RICOH IMAGING COMPANY, LTD.RICOH IMAGING
KodakGEOLYMPUS
PanasonicFUJIFILMKONICA MINOLTA
CASIOYiTechnologySONY ERICSSON
NORITSU KOKINokiaOLYMPUS IMAGING CORP.
--Pentaconhp
AgfaPhotoXIAOYIGoPro
Zoran CorporationNIKON CORPORATIONKonica Minolta Camera, Inc.
TOSHIBADigital Camera

THM image organization

Jak otevřít THM? Jak proces THM? Jak srazit THM? Jak snížit THM? Jak přejmenovat automaticky THM? Jak organizovat THM v sub-složky? Jak recompress THM? Jak vytvořit PDF fotoalbum z THM?

THM image color processing

Jak převést z THM na černou a bílou? Jak převést z THM do sépie? How to adjust the brightness THM? How to adjust the contrast THM? How to adjust the gamma THM? How to invert the colors of THM? How to boost colors from THM? How to boost the contrast from THM?

THM image processing

Jak přidat vodoznak na THM? How to create animated GIF slideshows from THM? How to create pencil/ink drawings from THM? Jak se k zaostření THM? How to blur THM? How to refocus THM? How to denoise hot pixels from THM? How to crop THM? How to rotate THM? How to flip THM?

THM image annotation

How to change the resolution in dpi of THM? How to modify the IPTC/XMP creation and modification dates of THM? How to modify the IPTC/XMP description of THM? How to modify the IPTC/XMP location of THM? How to modify the IPTC/XMP legal information of THM? How to edit the IPTC/XMP workflow (status and urgency) of THM? How to edit the IPTC/XMP copyright of THM?

Frequently Asked Questions about THM

Can I just rename a .thm file to .jpg?

Yes, for most cameras. THM files from Canon, GoPro, Sony and many other brands are JPEG images with a different extension, so renaming them to .jpg is enough. If a renamed file will not open, that camera stored its preview in another format.

Is a THM file the video itself?

No. It is only a small preview picture. The footage is in the video file with the same name, for example MVI_0001.MOV next to MVI_0001.THM. Deleting the THM does not delete the video.

How do I convert hundreds of THM files to JPG?

Drop the folder into Contenta Converter, choose JPG and click Start Converting. Every .thm becomes a .jpg in one batch, and you can resize or rename them in the same pass.

Need more than THM conversion? Browse supported cameras that produce THM files below, or:

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