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FastUtilz Blog

Guides, tutorials, and insights on data security and developer productivity.

Sep 24, 2026 Security

Stop Pasting JWTs Online: The Dangers of Unsecure Decoders

JSON Web Tokens (JWTs) contain highly sensitive authentication data. Here is why decoding them on random websites is a massive security risk, and how to decode JWTs locally.

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Sep 24, 2026 Productivity

How to Compare Text Files Locally Without Leaking Proprietary Code

Why using online diff checkers for proprietary code is dangerous. Learn how to compare code, configs, and documents safely with a 100% local text diff checker.

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Sep 24, 2026 Productivity

How to Generate Professional PDFs from Markdown Completely Offline

Markdown is the best way to write documentation and resumes. Learn how to convert your markdown files into clean, printable PDFs directly in your browser without uploading them.

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Sep 24, 2026 Web Performance

How to Compress Images Locally in Your Browser for Better Web Performance

Large images destroy your website's Core Web Vitals and SEO rankings. Learn how to compress PNGs and JPEGs securely and instantly without uploading them to a server.

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Sep 24, 2026 Security

The Hidden Danger of Online JSON Formatters (And How to Stay Safe)

Why pasting your API keys and production payloads into random online JSON formatters is a massive security risk. Discover the safest, 100% local browser-based JSON tools.

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