All tools run locally — your data never leaves the browser

Developer Tools, Simplified

Essential tools for modern developers. JSON formatter, Base64 encoder, UUID generator, regex tester, and more — all free, fast, and private.

15 tools100% privateNo sign-up

Formatters

Format and beautify code

JSON Formatter & Viewer

Parse, format, validate, escape/unescape, and explore JSON data with a tree view and stats.

Markdown Previewer

Write Markdown and preview rendered HTML with syntax highlighting and copy support.

Encoders & Decoders

Encode and decode data

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 strings with URL-safe variant support.

URL Encoder / Decoder

Encode, decode, and parse URLs with full component breakdown and query parameter table.

JWT Decoder & Verifier

Decode and verify JSON Web Tokens with signature validation, live expiry countdown, and claim explanations.

HTML Entity Encoder / Decoder

Encode and decode HTML entities with named and numeric entity support.

JWE Encrypt / Decrypt

Inspect, encrypt, and decrypt JSON Web Encryption tokens with AES-GCM and RSA-OAEP.

Generators

Generate data and identifiers

UUID Generator

Generate and validate UUID v4, UUID v7, and ULID identifiers with timestamp extraction.

Hash Generator

Generate and verify MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files.

Testers

Test and validate patterns

Regex Tester

Test, replace, and explain regular expressions with live highlighting and named groups.

Diff Checker

Compare text with line-level and word-level diff, collapsible sections, and patch export.

Cron Expression Parser

Parse cron expressions with human-readable descriptions and next execution times.

Converters

Convert between formats

Color Converter

Convert colors between HEX, RGB, HSL with WCAG AA/AAA contrast checker.

Timestamp Converter

Convert between Unix timestamps, ISO 8601, RFC 2822, and relative time formats.

Number Base Converter

Convert numbers between decimal, binary, octal, and hexadecimal with two's complement.

Why WW Tools?

WW Tools is a curated collection of 15 free developer utilities designed for everyday coding tasks. From formatting JSON and decoding JWTs to generating UUIDs and testing regular expressions, every tool is built to save you time and keep your workflow moving.

Every tool runs entirely in your browser using JavaScript and the Web Crypto API. Your data is never uploaded to a server, making WW Tools safe to use with API keys, tokens, configuration files, and other sensitive information. There are no accounts, no sign-ups, and no usage limits.

Whether you are a frontend developer debugging API responses, a backend engineer verifying hashes, or a DevOps professional parsing cron schedules, WW Tools provides the quick, reliable tools you need — all in one place, with no distractions.