PDF posts
7 posts in the PDF category.
How PDF Compression Works: Reducing File Size Without Losing Quality
A PDF exported from PowerPoint can be 50MB. The same content as a compressed PDF can be under 5MB. Here is exactly what gets compressed and how the algorithms work.
PDF Accessibility: Making Documents Screen-Reader Friendly
Most PDFs are accessibility nightmares — untagged content, no reading order, images without alt text. Making a PDF accessible is not difficult once you understand what a tagged PDF actually is.
Digital Signatures and PDF Security: How They Actually Work
A PDF digital signature is not a scanned image of your handwriting — it is a cryptographic proof tied to a certificate. Here is what it actually verifies and what it does not.
PDF vs DOCX: When to Use Each Document Format
PDF and DOCX both contain text and images, but they are designed for fundamentally different purposes. Choosing the wrong format causes friction for everyone who receives the file.
How PDF Works: Inside the World's Most Portable Document Format
A PDF looks like a printed page but is actually a complex container format with embedded fonts, compressed image streams, and a cross-reference table. Here is what is actually inside.
Common PDF Redaction Mistakes That Leak the Information You Tried to Hide
From the TSA 2014 manual to the Manafort 2019 filing, the most famous PDF redaction failures all happened the same way — a black rectangle drawn in a generic editor over text that was never actually removed. Here are the specific mistakes and how to verify before you ship.
How PDF Redaction Actually Works (And Why Black Boxes Are Not Enough)
Drawing a black rectangle over text in a PDF does not redact it. We show how proper redaction strips the underlying content stream, why metadata matters, and famous cases where it went wrong.