PDF guides
Short, practical how-tos for everyday PDF jobs.
- How to reduce PDF file size without ruining the qualityWhy PDFs get so big, how to compress them for email and upload forms, and what to do when a file is still too large.
- How to combine PDF files into one on Windows, Mac, iPhone and AndroidMerge several PDFs into a single document with the tools already on your device, or in a browser in under a minute.
- How to sign a PDF on your computer or phone, for freeAdd your signature to a PDF without printing it, ask others to sign, and understand when an electronic signature is enough.
- How to make a scanned PDF searchable with OCRTurn a scan into a PDF you can search, select and copy text from — and how to get the most accurate results.
- How to redact a PDF properly (and why black boxes often fail)Drawing a black box over text usually leaves it in the file. Here’s how to remove sensitive information for real.
- How to scan documents to PDF with your phoneThree free ways to scan paper to PDF with an iPhone or Android phone, plus tips for sharp, readable scans.
- How to password-protect a PDFEncrypt a PDF so only people with the password can open it, choose what they can do with it, and share the password safely.
- How to fill out a PDF form onlineFill in fillable and non-fillable PDF forms without printing them, then sign and send them back.
- How to convert iPhone HEIC photos to JPGWhy iPhone photos are HEIC, how to turn them into JPGs that open anywhere, and how to make your iPhone save JPG instead.
- How to reduce a photo’s file size to a specific KBUpload forms often want photos under 50, 100 or 200 KB. Here’s how to get any photo under the limit while keeping it sharp.