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PDF guides

Step-by-step help for the PDF stuff that eats your afternoon. No fluff, no 2,000-word intro about the history of the PDF.

6 min readHow to merge PDF files on iPhoneThree free ways to combine PDFs on an iPhone or iPad, with no app to buy and no subscription. 6 min readHow to combine PDF files on a MacYour Mac can already merge PDFs. Here are three free ways to do it, and when each one makes sense. 6 min readHow to merge PDF files on WindowsWindows doesn't come with a PDF merger. Here's the free way to do it, plus a couple of tricks and traps. 7 min readHow to reduce PDF size for emailYour PDF bounced, or the upload form says "file too large." Here's how to get it under the limit without making it unreadable. 6 min readIs it safe to merge PDFs online?Short answer: it depends on where your file actually goes. Here's how to tell, in about 30 seconds. 7 min readHow to sign a PDF without printing itSkip the print-sign-scan routine. Here's how to sign a PDF on any phone or computer in about a minute.