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# Metadata
## Reading metadata
```python
from pypdf import PdfReader
reader = PdfReader("example.pdf")
meta = reader.metadata
# All of the following could be None!
print(meta.title)
print(meta.author)
print(meta.subject)
print(meta.creator)
print(meta.producer)
print(meta.creation_date)
print(meta.modification_date)
```
## Writing metadata
```python
from datetime import datetime
from pypdf import PdfReader, PdfWriter
reader = PdfReader("example.pdf")
writer = PdfWriter()
# Add all pages to the writer
for page in reader.pages:
writer.add_page(page)
# If you want to add the old metadata, include these two lines
if reader.metadata is not None:
writer.add_metadata(reader.metadata)
# Format the current date and time for the metadata
utc_time = "-05'00'" # UTC time optional
time = datetime.now().strftime(f"D\072%Y%m%d%H%M%S{utc_time}")
# Add the new metadata
writer.add_metadata(
{
"/Author": "Martin",
"/Producer": "Libre Writer",
"/Title": "Title",
"/Subject": "Subject",
"/Keywords": "Keywords",
"/CreationDate": time,
"/ModDate": time,
"/Creator": "Creator",
"/CustomField": "CustomField",
}
)
# Save the new PDF to a file
with open("meta-pdf.pdf", "wb") as f:
writer.write(f)
```
## Updating metadata
```python
from pypdf import PdfWriter
writer = PdfWriter(clone_from="example.pdf")
# Change some values
writer.add_metadata(
{
"/Author": "Martin",
"/Producer": "Libre Writer",
"/Title": "Title",
}
)
# Clear all data but keep the entry in PDF
writer.metadata = {}
# Replace all entries with new set of entries
writer.metadata = {
"/Author": "Martin",
"/Producer": "Libre Writer",
}
# Save the new PDF to a file
with open("meta-pdf.pdf", "wb") as f:
writer.write(f)
```
## Removing metadata entry
```python
from pypdf import PdfWriter
writer = PdfWriter("example.pdf")
# Remove Metadata (/Info entry)
writer.metadata = None
# Save the new PDF to a file
with open("meta-pdf.pdf", "wb") as f:
writer.write(f)
```
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