In many companies, the inspection process occupies an important position in the entire workflow. For any job, the earlier the mistake is found, the smaller the loss. The software that inspects PDF files has always existed, and most of them are constantly being upgraded. Both Markzware's FlightCheck 3.4 and Extensis's Preflight Pro 2.1 can be used to troubleshoot PDF files and some typesetting software files; Acquired Knowledge's Download Mechanic Pro can check errors for Postscript and PDF files; Enfocus's Checkup 1.5 is also used to troubleshoot files. , but its functionality has been included in the company's new software PitStop 4.

Acrobat 4 also provides some new tools for users to check proofs. The completed PDF file can be sent to the customer by e-mail or other means for inspection by the customer. Customers can use some new tools (such as pencils, marker pens or electronic/sticker notes, etc.) to make some instructions on the PDF file used as a proof, and then send this PDF file back to the printing company.

There is also an important piece of software in checking proofs. This is PressReady. It can create very accurate proofs for documents or PDF files in formatted software formats using affordable desktop inkjet printers. It contains Postscript 3 RIP and also supports ColorSync. It also comes with a printer driver that replaces the drivers that are commonly used and can support certain models of printers such as Canon, Epson, and HP. It also comes with an ICC profile for some input devices, Adobe Gamma for creating a monitor profile, and some profiles for output devices.

In recent years, the software has become more and more important. With PDF files, it is not necessary to deal with files of various types of layout software, which greatly reduces the difficulty of the work of the software maker. Quite Imposing and Quite Imposing Plus are the freehand plug-ins produced by Quite Software for Acrobat. They can only make folds for PDF files. The resulting file is still in PDF format.