How to combine two pdfs?

Step 1:
upload your pdf files from local drive or url.
Step 2:
set the order of these files.
Step 3:
click "merge" button to combine.
Step 4:
click download link to download output pdf file.

Input Formats: PDF
Output Formats: PDF
Options Setting:

Upload file size should be less than: 50M

From URL:
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