All python-based pdf tools i made
Split: Open given pdf file and split them into seperated pdf files with format page_[num].pdf
Combine: Open all files ends with .pdf in current directory with format page_[num].pdf, then combine them into one pdf file.
Open all files that end with .jpg and .png in current directory, converting them into temporary pdf files, then combining into one pdf file and remove the temporary pdf files.
Open all files ends with .pdf in current directory and convert each page into png files.