Use a free online PDF merger tool
Upload the PDF files
Arrange the files in the desired order
Click the merge or combine button
Download the merged PDF file
Use Adobe Acrobat online free merge tool
Use Smallpdf free merge PDF tool
Use iLovePDF merge PDF tool
Use PDF24 Tools merge PDF option
Use Sejda PDF merge tool
Use built-in Preview on Mac
Use Microsoft Print to PDF on Windows with a PDF editor
Use free desktop software like PDFsam Basic
Use free browser-based PDF editors
Use Google Drive with a PDF add-on
Use command-line tools like Ghostscript or pdftk