PDF Guides
In-depth guides on PDF compression, merging, security, accessibility, and optimization — practical knowledge to get the most out of your PDFs.
PDF Compression Explained: How It Works and How to Shrink PDFs Without Losing Quality
Understand how PDF file size is determined, why some PDFs are huge, and the techniques — image downsampling, font subsetting, object streams — used to compress them.
Read guide →Merging and Splitting PDFs: Best Practices, Pitfalls, and When to Use Each
Learn when to combine PDFs into one document versus extracting specific pages, how bookmarks and links behave, and common mistakes to avoid.
Read guide →PDF Security: Passwords, Encryption, Redaction, and What Actually Protects Your Data
Understand the difference between owner and user passwords, AES vs RC4 encryption, proper redaction techniques, and common security myths.
Read guide →Making PDFs Accessible: Tags, Read Order, Alt Text, and PDF/UA Compliance
A practical guide to creating accessible PDFs that work with screen readers — tagged structure, reading order, alt text, language settings, and testing tools.
Read guide →Optimizing PDFs for the Web: Linearization, Fast Web View, and Reducing Load Time
Learn how linearized PDFs enable page-at-a-time downloading, why font subsetting matters for web delivery, and how to prepare PDFs for online viewing.
Read guide →🛡️ Privacy first. All tools run entirely in your browser. No files are uploaded to any server.