Runs in your browser — no uploads, no accounts, no telemetry.

Paste it. Transform it. Move on.

Single-purpose utilities for the data developers actually touch — JSON, Base64, JWTs, regex, hashes, timestamps, and more. Every transformation happens on your machine, in this tab.

Formatters

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

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.

cURL Converter

Paste a cURL command and get ready-to-run code for 8 languages, a live request-anatomy breakdown, and one-click secret redaction.

Generators

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

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

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.

YAML ↔ JSON Converter

Convert between YAML and JSON in both directions, plus a YAML reformat that keeps comments, anchors, and multi-document streams.

String Case Converter

Paste one identifier and get every naming case at once (camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE and more), each with its own copy button.

WW Tools is 18 small utilities for the data developers actually touch — JSON, Base64, JWTs, regex, hashes, timestamps, and more. Every tool runs in your browser using standard JavaScript and the Web Crypto API. Nothing is uploaded, nothing is stored, and there are no accounts to create.