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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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格式

THM

說明 THM文件格式基本上和JPEG文件格式(JFIF)是相同的。
優點 可以用來保存縮略圖來更快地預覽圖像。
缺點 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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保證滿意:

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攝影師（業余和專業），設計工作室，建築師，大機構（NASA，IBM，克萊斯勒，大學醫院）所使用的產品。
完全無風險. 購買後，您將獲得一個30天退款保證，絕不多問。
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 圖像優化

怎麼打開THM？ 如何處理THM？ 如何把THM縮小？ 如何減少THM的文件大小？ 如何自動重命名 THM？ 如何把 THM 整理成子文件夾？ 如何重新壓縮THM？ 如何用 THM 創建一個PDF相冊呢？

THM 圖像色彩處理

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THM 圖像處理

如何在 THM 上添加水印？ How to create animated GIF slideshows from THM? How to create pencil/ink drawings from THM? 如何銳化 THM ？ 如何模糊 THM ？ 如何重新聚焦 THM ？ 如何從 THM 去噪熱像素？ 如何裁切 THM？ 如何旋轉 THM ？ 如何翻轉 THM ？

THM 圖像標注

如何改變 THM 的DPI分辨率？ 如何修改 THM 的IPTC/XMP創建和修改日期？ 如何修改 THM 的IPTC/XMP說明？ 如何修改 THM 的IPTC/XMP位置？ 如何修改 THM 的IPTC/XMP法律信息？ 如何修改 THM 的IPTC/XMP工作流程（轉狂，緊迫性）？ 如何修改 THM 的版權資料？

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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