Data Tools

5 free data tools: JSON Formatter & Validator, JSON Compare (Diff), Regex Tester & Explainer, Cron Expression Parser, Text Diff & Compare. Each one runs in your browser, so nothing you paste is uploaded.

Security

4 tools

Password Generator

Generate strong random passwords.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes.

JWT Decoder

Decode and inspect JSON Web Tokens.

SSL Certificate & CSR Decoder

Decode X.509 certificates, chains and CSRs.

Data

5 tools

JSON Formatter & Validator

Format and validate JSON.

JSON Compare (Diff)

Compare two JSON documents.

Regex Tester & Explainer

Test regular expressions and see what they do.

Cron Expression Parser

Decode cron expressions and preview run times.

Text Diff & Compare

Compare two texts line by line.

Converters

8 tools

Base64 Encoder/Decoder

Encode and decode Base64 text/files.

URL Encoder/Decoder

Encode URLs and query parameters.

Unix Timestamp Converter

Convert Unix timestamps to readable dates.

CSV ↔ JSON Converter

Convert between CSV and JSON.

Number Base Converter

Convert binary, octal, decimal and hex.

Color Converter & Contrast Checker

Convert HEX, RGB, HSL, OKLCH and check WCAG contrast.

Unit Converter

Convert kg to lbs, cm to inches, miles to km and more.

Time Zone Converter

Convert times between time zones and cities.

Generators

5 tools

Credit Card Number Generator (test numbers only)

Generate valid-format test card numbers (non-functional).

UUID Generator

Generate UUID/GUID values.

SSN Generator

Generate fake Social Security Numbers with names.

Lorem Ipsum Generator

Generate placeholder text.

QR Code Generator

Create QR codes for links, Wi-Fi, contacts and more.