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Practical PDF Knowledge

PDF Guides, Tutorials & Tips

Written by founder Shreyash Srivastava. Learn how to optimize, protect, and manipulate your documents cleanly and privately without paying for heavy desktop suites.

How-To
2026-09-016 min read

How to Merge PDF Files for Free

Learn how to combine and merge multiple PDF documents into one file on Windows, Mac, or mobile without installing heavy desktop programs.

By Shreyash Srivastava
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Optimization
2026-09-035 min read

Reduce PDF File Size for Email Free

Simple methods to shrink oversized PDF documents to under 10MB or 25MB so they pass email attachment limits on Gmail, Outlook, and Yahoo.

By Shreyash Srivastava
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How-To
2026-09-055 min read

How to Convert PDF to JPG on Phone

Learn how to easily convert PDF pages into high-resolution JPG or PNG images directly on your smartphone without downloading third-party apps.

By Shreyash Srivastava
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Security
2026-09-067 min read

Are Online PDF Tools Safe to Use?

An honest look at the privacy risks of online PDF tools, cloud storage vulnerabilities, and why client-side browser processing is the safest choice.

By Shreyash Srivastava
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Productivity
2026-09-075 min read

How to Sign a PDF on Mobile Free

Learn how to easily draw, type, or place legal electronic signatures on PDF agreements, leases, and contracts using your smartphone screen.

By Shreyash Srivastava
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Organization
2026-09-085 min read

How to Split a PDF by Pages Free

Learn how to separate, divide, and extract specific pages from large multi-page PDF files into individual documents quickly and privately.

By Shreyash Srivastava
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Security
2026-09-116 min read

Permanently Redact PDF Online Free

Learn the vital difference between blacking out text and permanent redaction, and how to safely purge confidential data from PDF files.

By Shreyash Srivastava
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