# exiftool

<https://exiftool.org/>

## Install

::::{tab-set}
:::{tab-item} macOS
:sync: macos

```console
$ brew install exiftool
```

:::
::::

Show the version:

```console
$ exiftool -ver
12.85
```

## Rename files

Rename `jpg` files according to its taken time:

```console
$ exiftool -fast2 -ext jpg -if '${DateTimeOriginal}' "-Filename<IMG_\${DateTimeOriginal#;DateFmt('%Y%m%d_%H%M%S')}%+3c.jpg" *
```

## Modify time

Set time to the file modification time if no time is set in EXIF:

```console
$ exiftool -ext jpg -if 'not ${DateTimeOriginal}' '-AllDates<FileModifyDate' −overwrite_original *
```

Set time to a specified time:

```console
$ exiftool -ext jpg '-AllDates=2025:01:01 00:00:00' −overwrite_original *
```

Set time to one day before the original time:

```console
$ exiftool -ext jpg -if '${DateTimeOriginal}' -DateTimeOriginal-='1 00:00:00' −overwrite_original *
```

Sometimes the digitized time is earlier than the taken time:

```console
$ exiftool -ext jpg -if '${CreateDate} lt ${DateTimeOriginal}' '-DateTimeOriginal<CreateDate' -overwrite_original *
```

## Modify Camera Model

Set camera model to `UNKNOWN` if it is not set in EXIF:

```console
$ exiftool -ext jpg -if 'not ${Model}' '-Model=UNKNOWN' -overwrite_original *
```

Some cameras write `Software` instead of `Model`, so set camera model accordingly:

```console
$ exiftool -ext jpg -if 'not ${Model}' -if '${Software}' '-Model<${Software;$_=substr($_, 0, 8)}' -overwrite_original *
```

## Copy tags

For example, copy `Model`:

```console
$ exiftool -TagsFromFile source.jpg -Model -overwrite_original target.jpg
```

## Remove thumbnail image

```console
$ exiftool -ext jpg -if '${ThumbnailImage}' -ThumbnailImage= -overwrite_original -R .
```