Poppler PDF Tools

brew install poppler

# split a PDF to pages a1.pdf, a2.pdf...
pdfseparate receipts.pdf a%d.pdf

# combine PDF pages to a single document
pdfunite a1.pdf a2.pdf receipts.pdf.pdf

# list images in a PDF
pdfimages -list receipts.pdf

# save all images in PDF as PNGs
pdfimages -png receipts.pdf ./

# list the embedded files in a PDF
pdfdetach -list book.pdf

# save all embedded files in a PDF
pdfdetach -saveall book.pdf

# list fonts used in a PDF
pdffonts deck.pdf

# convert PDF pages to images
pdftocairo receipts.pdf ./

# convert PDF pages to HTML
pdftohtml receipts.pdf ./out.html

# convert PDF to PPM
pdftoppm receipts.pdf ./

# convert PDF to PostScript
pdftops receipts.pdf ./out.ps

# convert PDF to a text file
pdftotext receipts.pdf ./out.txt