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Background and method behind the tools — why a file behaves the way it does, which setting actually matters, and the mistakes that are easy to make. No sign-up, no newsletter, nothing to dismiss.
Image
Compressing an image to under 200 KB without ruining it
A practical method for hitting a file-size limit on a photo — which settings matter, which do not, and why resizing beats quality reduction almost every time.
2026-09-24 · 9 min readWebP vs JPEG vs PNG: which one to actually use
When each image format wins, when it loses, and the one rule that decides it in about two seconds. Includes what actually happens when you convert between them.
2026-09-24 · 8 min readDo image dimensions still matter for page speed?
Why a 4000-pixel photo displayed at 400 pixels is still costing your visitors time, and the two numbers worth checking before you publish anything.
2026-09-24 · 7 min readDeveloper
Why you should never paste a JWT into an online decoder
A JSON Web Token is a working credential, not a document. What a hosted decoder actually receives, and how to inspect a token without handing it to anyone.
2026-09-24 · 7 min readThe CSV quoting rules that break naive parsers
Why splitting on commas loses data, how quoting and escaping actually work, and the three characters that will wreck a file written by hand.
2026-09-24 · 8 min readUnix timestamps: seconds, milliseconds and drifting logs
What a Unix timestamp counts, why the same instant appears as two different numbers, and how to tell which one you are looking at without guessing.
2026-09-24 · 6 min readBase64 is not encryption
What Base64 is actually for, why it makes files bigger rather than smaller, and the security mistake that turns up in real production configs.
2026-09-24 · 7 min read