Private by design · Offline capable · Free

Universal text and developer tools that run entirely in your browser

Format JSON, convert YAML, test regex, compare text, decode JWTs, generate UUIDs, and more—without uploads, accounts, or waiting for a server.

Browse all tools Open JSON Formatter

15specialized tools

0server uploads

100%client-side processing

✓ No signup✓ Local processing✓ Mobile-first✓ Keyboard accessible✓ Offline PWA

Tool directory

Choose a utility

Search by task, format, or keyword. Every result opens a dedicated, linkable tool page.

JSON Formatter & Validator Format, validate, minify, and inspect JSON with clear syntax errors and privacy-first browser processing. Formatters · No signup

YAML ↔ JSON Converter Convert YAML and JSON in either direction with validation, indentation controls, and local-only processing. Converters · No signup

XML Formatter & Validator Format and validate XML with indentation, minification, clear parse errors, and privacy-first local processing. Formatters · No signup

Regex Tester with Live Highlighting Build and debug JavaScript regular expressions with flags, groups, replacement previews, and live highlighting. Text · No signup

Text Diff Checker Compare original and revised text with line-by-line additions, removals, statistics, and copyable diff output. Text · No signup

Text Case Converter Convert text between uppercase, lowercase, title, sentence, camel, Pascal, snake, kebab, and constant case. Text · No signup

Word & Character Counter Count words, characters with and without spaces, sentences, paragraphs, and estimated reading time live. Text · No signup

Lorem Ipsum Generator Generate customizable placeholder paragraphs, sentences, words, and list items for design and development mockups. Generators · No signup

UUID Generator (v1 & v4) Generate single or bulk UUID v1 and v4 identifiers with uppercase, compact, and copy-all options. Generators · No signup

Base64 Encoder / Decoder Encode and decode Base64 safely with Unicode text, URL-safe output, wrapping, and local-only conversion. Converters · No signup

URL Encoder / Decoder Encode and decode URL components, query strings, and full URLs with Unicode support and clear validation errors. Converters · No signup

JWT Decoder Decode and inspect JWT header and payload claims locally, including expiration, issued-at time, and algorithm metadata. Security · No signup

Markdown Previewer Write Markdown and inspect a sanitized live HTML preview with common syntax, copyable HTML, and local processing. Text · No signup

CSV → JSON Converter Convert CSV data to JSON with header, delimiter, quote, and empty-row controls, then copy or download the result. Converters · No signup

HTML Entity Encoder / Decoder Convert text to HTML entities and decode named or numeric entities back into readable characters. Converters · No signup

Why it works

Built for trust, speed, and repeat use

Private input handling

All parsing and transformation happens with local JavaScript. Sensitive payloads, logs, and configuration are not transmitted by the tools.

Fast static delivery

Small Vite bundles, system fonts, code splitting, and static hosting keep pages responsive on mobile connections.

Useful beyond the input box

Each page includes examples, FAQs, related tools, and explanatory content so the answer is understandable—not merely automated.

Offline and installable

The service worker caches core assets after your first visit, making the toolkit available as a browser-installed PWA.

Guides

Learn the formats behind the tools

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