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.ithmb

ITHMB file: what it is and what can be recovered from it

An .ithmb file is a photo thumbnail cache that iTunes and older iPods and iPhones build when photos are synced.

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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 ITHMB 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.

Each file holds several small previews stored as raw pixel data, not your full-size photos. Contenta Converter reads all common layouts and saves every preview in the file as its own JPG or PNG.

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格式

ITHMB

公司

Apple
說明 An ITHMB file is an Apple photo cache that iTunes and older iPods and iPhones build when photos are synced. It is not a JPEG: each file holds several thumbnails stored as raw RGB565 or YCbCr pixels, with no image header. Contenta Converter decodes all common layouts and saves every thumbnail in the file as its own JPG or PNG.
優點 Can be used to recover photo thumbnails from old iPhone/iPod backups.
缺點 Contains only low-resolution thumbnail previews, not the original full-size photos. The .ithmb extension is not recognized by most image viewers.

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使用者證明:

"今天一定得轉換一些圖像。你的軟件真是救了我一命！謝了！"
Jason Hoffman，加利福尼亞州

"我每天都拍攝RAW圖像。我非常喜歡你的軟件，因為它很省時。"
Jim Richardson，印第安納州

"我一直都在注意圖像轉換器。我發覺你們的軟件乾淨，簡單，而且非常棒！"
Brandon Keegan，紐約州

保證滿意:

簡單又專業的照片轉換以及處理過程
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。
samsungNIKON CORPORATIONPanasonic
Apple

ITHMB 圖像優化

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

ITHMB 圖像色彩處理

如何把 ITHMB 轉換成黑白圖像？ 如何把 ITHMB 轉換成棕褐色圖像？ 如何調整 ITHMB 的亮度？ 如何調整 ITHMB 的對比度？ 如何調整 ITHMB 的伽瑪？ 如何反轉 ITHMB 的顏色？ 如何提高 ITHMB 的色彩？ 如何增強 ITHMB 的對比度？

ITHMB 圖像處理

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

ITHMB 圖像標注

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

Frequently Asked Questions about ITHMB

Does an ITHMB file contain my original photos?

No. It holds several small thumbnails that iTunes and older iPods and iPhones build when photos are synced, stored as raw RGB565 or YCbCr pixels. The full-size photos are not in it.

Can I rename an .ithmb file to .jpg?

No. Unlike a THM file, an ITHMB file is not a JPEG and has no image header, so a new extension does not make it open. It has to be decoded.

What does Contenta Converter get out of an ITHMB file?

It decodes all common layouts and saves every thumbnail in the file as its own JPG or PNG, for a whole folder at once.

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

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