All Online Tools
Search and browse 13 focused utilities. Most inputs are processed locally in your browser.
13 tools
JSON Formatter
Format, validate and beautify JSON with configurable indentation and instant errors.
Base64 Encoder / Decoder
Encode or decode UTF-8 text locally with clear validation and one-click copy.
UUID Generator
Generate up to 100 cryptographically random UUID v4 identifiers.
Meta Tag Generator
Generate complete SEO, Open Graph and social metadata with live previews.
Loan Calculator
Calculate single or combined loans with amortization and CSV export.
Compound Interest Calculator
Project savings growth with regular contributions and compound interest.
JSON Validator
Check JSON syntax and locate errors without uploading your data.
JSON Minifier
Compress valid JSON and compare original and minified file sizes.
URL Encoder / Decoder
Safely encode URL components or full URLs and decode percent-encoded text.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to local, UTC and ISO dates.
Robots.txt Generator
Build crawler rules and sitemap directives, then copy or download robots.txt.
Open Graph Generator
Create Open Graph and Twitter Card markup with a responsive social preview.
Mortgage Calculator
Estimate principal, interest, taxes, insurance, PMI and HOA costs.