Practical guides

Guides for common file, data, and developer tasks

Use these short guides to solve real browser-based workflows, then open the matching free tool when you are ready to test your own content.

How to compare two JSON API responses How to validate a sitemap XML file How to decode a JWT safely How to convert CSV to JSON for imports Base64 encode vs decode explained How to Validate JSON Before an API Import JSON Beautify vs Minify: When to Use Each How to Compare CSV Exports for Data Changes How to URL Encode Query Parameters How to Build UTM Links Without Breaking Tracking How to Check Meta Title and Description Length Robots.txt Allow and Disallow Rules Explained How to Generate and Check a Strong Password How to Clean Duplicate Lines From Text How to Format Phone Numbers as E.164 MSISDN

How to use these guides

Each guide is written around a practical task, not a generic definition. Start with the guide that matches your current workflow, review the checklist, then open the linked browser tool to test your own content.

The guides are intentionally connected to validators, converters, diff tools, encoders, and SEO utilities so you can move from learning to action quickly. This also makes it easier to discover related tools when one task leads to another.

For private or sensitive data, remove secrets, tokens, passwords, private customer records, and internal identifiers before using any browser-based utility. The tools are designed for local processing, but careful data handling is still a good habit.

Choosing the right guide

If you are comparing two versions of a file, start with a comparison guide. If you are checking whether content is valid before publishing or importing it, start with a validator guide. If you are moving data between systems, use a converter guide and then validate the output before relying on it.

Most workflows benefit from two steps: clean or format the input first, then run the final checker or converter. This keeps results easier to review and reduces false alarms caused by spacing, indentation, or copied spreadsheet artifacts.