Practical Guides for Data and Browser Tools

Find common JSON syntax errors, repair quotes and trailing commas, then format nested data without changing its meaning.

Learn what a JWT decoder reveals, why readable claims are untrusted, and how to inspect expiry without confusing decoding with signature verification.

Make compact JSON readable with indentation, inspect nested objects and avoid changes to large identifiers or duplicate keys when formatting.

Read the header and payload of a test JWT, understand its three segments and inspect time claims without mistaking decoding for verification.

Balance dimensions, format and quality when reducing image file size. Compare real outputs and understand why PNG and target sizes behave differently.

Compare PNG, JPEG and WebP for photos, transparent graphics and screenshots. Choose by visible detail, compatibility and actual file size.

Convert a PNG to WebP, keep transparency and compare quality and size. Learn what to inspect before replacing a web image with the exported file.

Remove common embedded image metadata by exporting a new image, inspect the result and understand what metadata cleanup cannot hide in visible pixels.

Combine PDF files, select source pages and check the resulting document. Avoid page-number confusion and understand encrypted-file and signature limits.

Choose between extracting selected pages and splitting a PDF into groups. Use page ranges correctly and inspect new files before sharing them.