note how to erase pdf metadata

data/exiftool.md

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+---
+title: "exiftool"
+tags: [ "Documentation", "Metadata" ]
+---
+
+Find metadata.
+
+```bash
+exiftool image.jpg
+```
+
+Find info on all images in current directory.
+
+```bash
+exiftool -ext .png .
+```
+
+You can make this recurring with the -r switch.
+
+And overwrite all metadata:
+
+```bash
+exiftool -all= -overwrite_original -ext jpg .
+```
+(NB: This does not work on pdf data. See [here](pdf_erasure.md) for erasing all pdf data)
+
+Or just GPS data:
+
+```bash
+exiftool -gps:all= *.jpg
+```
+
+You can also use the imagemagick tool:
+
+```bash
+identify -verbose
+```
+
+
+