Essential Browser
Utility Toolkit.
Format JSON/SQL, decode JWTs, encode Base64, generate cron schedules, test regex, and more. A high-performance collection of essential, browser-native offline utilities with zero analytics or tracking.
How it works
Three steps between you and a clean output.
Search
Find the formatter, decoder, or generator you need in the index below.
Use instantly
No sign-up, no server round-trip — every tool runs entirely client-side.
Ship
Copy the clean output straight into your project and move on.
Every tool, ready instantly
Search or filter by category, then open any utility below. Everything runs client-side.
Search across 26 browser-native utilities and jump straight into the right formatter, generator, or decoder.
JSON Formatter & Validator
Format, validate, and minify raw JSON string data. Select custom tab spacings and copy formatted outputs instantly.
JWT Decoder
Decode JSON Web Tokens (JWT) client-side. Inspect decrypted header definitions, payload claims, and signature codes.
Base64 Encoder / Decoder
Encode raw text strings into compliant Base64 format, or decode Base64 encoded characters back to plain text.
Cron Expression Generator
Generate standard cron expressions interactively. Pick custom minute, hour, and day schedules to get the cron string.
UUID v4 Generator
Generate compliant UUID version 4 strings in bulk instantly. Copy generated UUID lists in one click.
Regex Tester & Matcher
Test your regular expressions against sample texts with match highlighting, capture group indicators, and flags.
SQL Formatter & Beautifier
Beautify raw SQL queries. Automatically capitalize standard keywords and align spacing for readable database scripts.
Unix Epoch Timestamp Converter
Convert Unix epoch timestamps to human-readable dates (UTC/Local) and generate current milliseconds stamps.
Cryptographic Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hash digests in real-time in your browser.
URL Encoder & Decoder
Encode plain text strings into URL-safe formats or decode escaped URL percent encodings.
Secure Password Generator
Create secure random passwords. Adjust lengths and select numbers, symbols, and casing options.
Markdown Editor & Previewer
Write Markdown syntax in real-time and preview the compiled HTML layout side-by-side.
JSON ↔ YAML Converter
Convert JSON data to YAML format or YAML back to JSON, entirely in your browser.
CSV ↔ JSON Converter
Convert CSV data (including quoted fields) to JSON, or a JSON array of objects back to CSV.
HTML Entity Encoder / Decoder
Encode text into HTML-safe entities, or decode named and numeric HTML entities back to plain text.
URL Parser
Break any URL down into its protocol, host, port, path, query parameters, and hash — entirely client-side.
Query String Parser & Builder
Parse a URL query string into key-value pairs, or build one from scratch with proper URL encoding.
Color Converter
Convert colors between HEX, RGB, and HSL formats with a live preview swatch.
Lorem Ipsum Generator
Generate placeholder Lorem Ipsum text by word, sentence, or paragraph count for mockups and layouts.
Text & Code Diff Viewer
Compare two text or code snippets side-by-side or unified with additions, deletions, and line-by-line diff highlighting.
Text Case Converter
Convert text between camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, Title Case, and more.
XML Formatter & Validator
Pretty-print and validate XML documents with configurable indentation, entirely in your browser.
HTML Formatter & Beautifier
Pretty-print HTML markup with proper indentation, safely parsed without executing any embedded scripts.
CSS Formatter & Minifier
Beautify CSS with consistent indentation, or minify it down to a single compact line.
Email Format Validator
Check whether a string is a well-formed email address, with a clear reason when it isn't.
HTTP Headers Parser & Builder
Parse a raw HTTP headers block into a table, or build one from key-value pairs. No requests are sent.
Everything a developer needs, instantly
No servers, no tracking, no latency. All tools run locally in your browser.
Formatters & Minifiers
Validate and beautify JSON, SQL, HTML, CSS, and XML scripts instantly in the browser with high-performance parsing tools.
Decoders & Encoders
Inspect JWT payloads, translate Base64 binary strings, handle URL parameter encoding, and audit hash signatures.
Regex & Cron Engines
Match expression patterns dynamically, test regex captures, and decode standard cron scheduling values into text logs.
Frequently Asked Questions
Is my data sent to any server?
No. All parsing, formatting, and cryptography calculations execute entirely client-side. No developer inputs ever leave your device.
Are the tools offline-friendly?
Yes. The Toolkit is built as a progressive web utility with caching, enabling complete offline functionality.