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Tips, guides and tutorials.

Regex performance and validation: avoid ambiguous patterns

Bound input, spot ambiguous backtracking, and separate format checks from semantic validation.

Show the destination, preserve the quiet zone, and test contrast, size, distance, and multiple devices.

Reorder and extract synthetic sample pages, then check links, forms, metadata, signatures, and size.

Inspect GPS, device, date, and copyright; create a clean derivative and verify the outgoing file.

Verify downloads with a trusted reference and separate integrity, passwords, and signatures.

Compare creation methods, theoretical-entropy assumptions, and defenses that reduce account risk.

Inspect the three JWT segments and learn why signatures and claims must be validated by a trusted system.

Reduce SVG file weight while preserving rendering, local references, and accessible alternatives.

Define rows, flatten nested data, and avoid losses when converting customers, orders, arrays, and types to CSV.

Locate JSON syntax errors, correct ambiguous data, and verify the result with a reproducible method.

How to protect sensitive data and why local-first browser tools are the future.

Learn how to optimize images to drastically improve your website load speeds.

Everything you need to know about Base64 encoding, decoding, and when to use it.

Discover the most useful PDF tools for developers and designers, from compression to merging.