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Notes on files, formats and the tools that handle them.

Roundups, comparisons and the occasional opinion, all aimed at one thing: spending less time fighting with files and more time on the work that matters.

Latest 6 min Jun 4, 2026

Is It Safe to Paste a JWT Into an Online Decoder?

Decoding a JWT is harmless. Pasting a live one into a random website is the part that can get your account taken over.

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jwtsecuritydev tools

7 min May 30, 2026

Password-Protecting a PDF: What It Really Stops

PDFs have two kinds of passwords, and only one of them is real protection. Here is what each actually stops.

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6 min May 28, 2026

Why "redacted" PDFs still leak their text

Drawing a black rectangle over text hides nothing. The words sit underneath, ready to be copied out by anyone who knows where to click.

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7 min May 21, 2026

PNG, JPG, WebP or AVIF: A decision tree

Skip the spec dump. Pick PNG, JPG, WebP, or AVIF by what the image actually is and where it goes.

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8 min May 18, 2026

The Privacy Case for In-Browser File Tools

In-browser tools keep your file on your device, but the page is still code you trust. Here is what that protects and how to check it.

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