Free Developer Web Tools: Fast, Local & Secure

Data & Text

JSON to YAML Converter

A simple, browser-based JSON to YAML converter. It takes a JSON payload and converts it to YAML.

JSON to CSV Converter

Convert a JSON object or array of objects into downloadable CSV in one click.

Count Duplicates in a List

Aggregate lines and count occurrences. Find duplicate lines or count repeats in Excel columns.

Diff Checker

Compare two text blocks line-by-line and highlight differences with added, removed, and unchanged lines.

PHP print_r to JSON

Convert PHP print_r output back to valid JSON format.

YAML to TOML Converter

Instantly convert your YAML configuration data into clean, valid TOML format. Fast, free, and completely client-side.

Developer Tools

ASCII Table

Complete ASCII character table with decimal, hex, octal, and HTML entity values.

JSON Schema Validator

Validate JSON data against a JSON Schema with support for Draft 2020-12, Draft 2019-09, Draft 7, and earlier.

View Character Codes

View decimal, hexadecimal, octal, and UTF-8 byte values for any character or text.

Real-time HTML Editor

Type HTML and see the result instantly in a live preview pane.

World Time Buddy

Compare timezones side-by-side with live clocks and a 24-hour grid to find the best meeting times across locations.

JWT (JSON Web Token) Decoder

Decode and inspect JWT tokens to see the header, payload, and signature. Perfect for debugging authentication.

Regular Expression (RegEx) Tester

Test regular expressions against text in real-time with syntax highlighting, capture groups, and flag support.

Free Cron Expression Generator & Parser

Easily build, test, and translate complex crontab scheduling expressions into plain English. Stop guessing and know exactly when your automated background jobs will run.

SQL Formatter

Format and indent your messy SQL queries to make them readable. Supports multiple SQL dialects.

Unix Timestamp Converter (Epoch Converter)

Convert human-readable dates to Unix timestamps (epoch) and vice versa. Includes a live current epoch display with a 'Get Current Epoch' button.

Bcrypt Hash Generator & Verifier

Generate secure bcrypt hashes from plaintext or verify existing hashes instantly.

HTTP Status Code Reference

A quick, searchable index of all standard HTTP response status codes. Quickly identify the meaning behind 200, 404, 500, and more.

Encoders & Decoders

UTF-8 Encoder/Decoder

Encode text to UTF-8 \xNN byte sequences or decode \xNN sequences back to text.

Hex to UTF-8 Converter

Convert hexadecimal byte sequences to UTF-8 text and vice versa.

Number Base Converter

Convert numbers between Decimal (base 10), Hexadecimal (base 16), Binary (base 2), and Octal (base 8) instantly.

URL Encoder/Decoder

Encode or decode strings to and from URL-encoded format (percent-encoding).

Generators

Static QR Code Generator

Generate static QR codes instantly directly in your browser. Supports URLs, WiFi config, text, crypto addresses, and JSON with SVG/PNG exports.

Secure Password & Passphrase Generator

Generate strong, secure passwords or memorable passphrases instantly. Completely client-side for total privacy.

Generate Calendar Dates

Generate a sequence of calendar dates with customizable start date, interval, count, and output format.

UUID Generator

Generate UUIDs (v4 random or v7 timestamp-based) with configurable quantity, case, and formatting options.

Campaign URL Builder

Build custom campaign URLs with UTM parameters for tracking marketing campaigns in Google Analytics.

Fast, Free Web Tools for Developers & Power Users