Whether or not you are paperless in your office, you are probably dealing with PDFs. If you are dealing with a lot of them, you need PDF-editing software.

Adobe Acrobat is the definitive PDF-editing software, by the company that created the PDF format. Among the many features are a few that stand out. Bates stamping, for example. Even if you do everything else on paper, Bates stamping PDFs instead of reams of paper can save a ton of time and paper. The Pro version also has permanent redaction tools. You can even automatically redact things like social-security numbers automatically from every page of a huge document.

Unfortunately, Acrobat Professional — the version you want for legal work — starts at $449 (or $240/year). But there are alternatives that don’t cost an ongoing arm and a leg.

Here are a few to consider.