Learn PDF — Articles, Guides & Best Practices
Deep-dives, tutorials and explainers from the PDFWix team.
What Is a PDF? A Plain-English Guide to the Format
How the Portable Document Format works, why it became the global standard, and when you should and shouldn't use it.
The Best Way to Compress a PDF Without Losing Quality (2026)
Five techniques to shrink any PDF — from a quick browser tool to advanced print-shop optimisation.
How to Merge PDFs Without Losing Quality or Bookmarks
A short guide to lossless PDF merging, including how to preserve bookmarks, form fields and digital signatures.
PDF vs PDF/A vs PDF/X: Which Format Should You Use?
Understand the three major PDF flavours and when each one matters for archiving, printing or general distribution.
Are Online PDF Tools Safe? A Privacy Deep-Dive
What actually happens to your PDF when you upload it — and how to tell which tools are trustworthy.
OCR Explained: How Scanned PDFs Become Searchable
The technology behind optical character recognition and how to get the best accuracy from a scanned PDF.
Are Online PDF Tools Safe? A Privacy Deep-Dive
What actually happens to your PDF when you upload it — and how to tell which tools are trustworthy.
OCR Explained: How Scanned PDFs Become Searchable
The technology behind optical character recognition and how to get the best accuracy from a scanned PDF.
Are Electronic Signatures Legally Binding? (US, EU & UK)
A practical look at e-signature law and which PDFWix signature type to use for which document.
How to Automate PDF Workflows With the PDFWix API
From a Zapier zap to a Python cron job — five real-world automation recipes.
PDF Accessibility: A Quick Guide to Making Tagged PDFs
How to produce screen-reader-friendly PDFs that meet WCAG 2.1 and Section 508.
PDF/A for Long-Term Archiving: Everything You Need to Know
When PDF/A is required, how it differs from regular PDF, and how to validate your output.
How to Send a Large PDF by Email (5 Methods That Actually Work)
From compression to cloud links to splitting — pick the right tool for the job.
PDF Form Fields Explained: AcroForms vs XFA
Why some PDF forms behave differently and how to fill them reliably.
Reduce PDF Size for Email: Hit Gmail, Outlook & iCloud Limits
Step-by-step methods to shrink any PDF below 25 MB (Gmail), 20 MB (Outlook) or 5 MB (most corporate gateways) without losing readability.
Convert PDF to Editable Word for Free (Without Losing Layout)
Three methods to convert any PDF into a Word document you can actually edit — and what to do when the layout breaks.
How to Sign a PDF on iPhone (Without the Acrobat App)
Three free ways to sign a PDF directly on your iPhone — including the browser method that works on any device.
How to Remove a Password from a PDF (Legally and Safely)
Step-by-step: unlock a PDF you have the password for, plus what to do when you've forgotten it.
Extract Specific Pages from a PDF (Without Splitting the Whole File)
How to pull pages 3, 7 and 12-15 out of a 200-page PDF into a clean new document — fast and free.