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# Merging PDF files
## Basic Example
```python
from PyPDF2 import PdfMerger
merger = PdfMerger()
for pdf in ["file1.pdf", "file2.pdf", "file3.pdf"]:
merger.append(pdf)
merger.write("merged-pdf.pdf")
merger.close()
```
For more details, see an excellent answer on
[StackOverflow](https://stackoverflow.com/questions/3444645/merge-pdf-files)
by Paul Rooney.
## Showing more merging options
```python
from PyPDF2 import PdfMerger
merger = PdfMerger()
input1 = open("document1.pdf", "rb")
input2 = open("document2.pdf", "rb")
input3 = open("document3.pdf", "rb")
# add the first 3 pages of input1 document to output
merger.append(fileobj=input1, pages=(0, 3))
# insert the first page of input2 into the output beginning after the second page
merger.merge(position=2, fileobj=input2, pages=(0, 1))
# append entire input3 document to the end of the output document
merger.append(input3)
# Write to an output PDF document
output = open("document-output.pdf", "wb")
merger.write(output)
# Close File Descriptors
merger.close()
output.close()
```
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