Why blurring sensitive text isn't enough
Blurred and pixelated text looks hidden, but it often isn't. What visual obscuring actually does to your pixels, why it can be reversed, and what secure redaction means.
6 min read · Reviewed July 2026
Guides
Practical, technically accurate explanations of how files leak information — and how to stop them. Every guide maps to tools that run locally in your browser.
What your photos reveal: EXIF, GPS, and hidden thumbnails
A photo is more than its pixels. GPS coordinates, camera serial numbers, timestamps, editing history, and embedded thumbnails travel inside image files — here's what's there and how to remove it.
7 min read · Reviewed July 2026
Hidden sheets, very-hidden sheets, and what Excel won't show you
A spreadsheet you're about to share can contain entire sheets you can't see, formulas pointing at internal data, and identity metadata. Where Excel hides data and how to audit a workbook before it leaves your hands.
8 min read · Reviewed July 2026
Before you post that screenshot: keys, tokens, and tabs
The fastest way to leak a credential in 2026 is still a screenshot. What commonly leaks, why cropping and blurring don't save you, and a checklist to run before an image goes public.
6 min read · Reviewed July 2026
Sanitizing documents before you paste them into an AI tool
AI assistants are useful precisely because you give them your real documents — which is why the documents should be cleaned first. A practical pre-upload routine that runs entirely on your device.
7 min read · Reviewed July 2026
The PDF fields that out your author name
That 'anonymous' PDF probably has a name in it. What the Info dictionary stores, how producer strings fingerprint your software, and what metadata cleaning can and cannot fix.
6 min read · Reviewed July 2026