Developer and Website Utility Tools
Practical utilities for Base64, UUIDs, JSON formatting, HTML entities, UTM links, robots.txt, sitemaps, schema markup, and website publishing support.
Base64 Encoder Decoder
Encode text to Base64 or decode Base64 back to text.
UUID Generator
Create random UUID v4 identifiers.
JSON Formatter
Format JSON for reading and checking structure.
HTML Entity Encoder Decoder
Encode or decode HTML entities.
UTM Builder
Build campaign tracking URLs.
Schema Markup Generator
Generate JSON-LD markup drafts.
Robots.txt Generator
Draft a simple robots.txt file.
Sitemap URL List Generator
Format URL lists for sitemap and SEO work.
Canonical Tag Checker
Review canonical tag assumptions.
How to use this collection
These tools support lightweight website operations, testing, formatting, and publishing workflows without requiring a full development environment.
- Start with the closest tool for your immediate task.
- Use related tools to continue the workflow instead of searching again.
- For important finance, health, security, or business decisions, verify the result with a qualified source.
Popular developer formatters and converters
Use these browser-based developer tools for everyday debugging, formatting and conversion tasks: JSON Formatter, Regex Tester, URL Encoder Decoder, Unix Timestamp Converter, Hash Generator, and Number Base Converter.