PDF how-to guides
Practical guides for common PDF tasks. Every tool runs in your browser — no uploads, no account required.
How to Compress a PDF on Mac
Learn how to reduce PDF file size on Mac using Preview, and discover CalmPDF — a free, private browser-based alternative that works on any device.
How to Compress a PDF Without Losing Quality
Understand lossy vs lossless PDF compression, and learn how CalmPDF preserves quality while still meaningfully reducing file size.
How to Merge PDF Files Free
Compare the best ways to merge PDF files for free, including CalmPDF — a fully private option that never uploads your files to a server.
How to Split a PDF into Multiple Files
A step-by-step guide to splitting a PDF into separate files using CalmPDF, with tips on extracting invoices, chapters, and specific page ranges.
How to Reduce PDF File Size
Discover why PDFs get large, the best methods to reduce file size, and a step-by-step guide to compressing PDFs in your browser with CalmPDF.
How to Combine PDF Files
A complete guide to combining PDF files — from merging contracts to assembling reports — using CalmPDF's free, private browser-based tool.