Developer Tools

Free, client-side developer utilities. No signup, no data sent anywhere.

Validate your .env files

Check for syntax errors, deprecated variables, and production readiness.

Open Validator →

Formatters

JSON Formatter & Validator

Format, prettify and validate JSON data online. Free JSON formatter with syntax checking.

SQL Formatter

Format and beautify SQL queries online. Uppercase keywords, indent clauses for readability.

Markdown Preview

Preview Markdown as HTML in real time. Live markdown renderer for documentation and notes.

CSS Minifier / Beautifier

Minify and beautify CSS online. Reduce file size by removing whitespace and comments.

Encoders & Decoders

Base64 Encode / Decode

Encode and decode Base64 and Base64URL strings online. Toggle between standard Base64 and URL-safe Base64URL with real-time conversion.

URL Encode / Decode

Encode and decode URLs online. Percent-encoding and decoding for query strings.

JWT Debugger

Decode, inspect and verify JSON Web Tokens. View claims with OIDC descriptions, verify signatures with HS256/RS256/ES256, and auto-fetch public keys from OIDC issuers.

HTML Entity Encode / Decode

Encode and decode HTML entities online. Escape and unescape HTML characters.

Image to Base64 Converter

Convert images to Base64 data URIs online. Drag and drop or upload any image to get Base64 encoded output.

Generators

UUID Generator

Generate random UUIDs (v4) online. Bulk UUID generation with one click.

Hash Generator

Generate SHA-1, SHA-256, and SHA-512 hashes online. Free cryptographic hash tool.

Lorem Ipsum Generator

Generate lorem ipsum placeholder text online. Choose paragraphs, sentences or words.

Password Generator

Generate strong, random passwords and passphrases online. Strength meter, configurable character sets, and word-based passphrase mode.

QR Code Generator

Generate QR codes from any text or URL online. Download as PNG or SVG.

.gitignore Generator

Generate .gitignore files for any language or framework. Select from Node.js, Python, Go, Rust, Java, and more.

Dockerfile Generator

Generate Dockerfiles for Node.js, Python, Go, Rust, and more. Multi-stage build support.

JWT Generator

Create and sign JSON Web Tokens with custom claims online. Supports HS256, HS384, and HS512 algorithms.

Converters

Unix Timestamp Converter

Convert Unix timestamps to dates and back. UTC and local time support.

Color Converter

Convert colors between HEX, RGB, and HSL formats online.

Number Base Converter

Convert numbers between decimal, hexadecimal, octal and binary online.

Text Case Converter

Convert text between camelCase, PascalCase, snake_case, kebab-case, UPPER, lower, Title and Sentence case.

YAML ↔ JSON Converter

Convert YAML to JSON and JSON to YAML online. Instant bidirectional conversion.

JSON to TypeScript

Convert JSON objects to TypeScript interfaces and types online. Instant type generation.

cURL to Code Converter

Convert cURL commands to Python, JavaScript, Go, PHP, and Ruby code. Free online cURL converter.

JSON to CSV Converter

Convert JSON arrays to CSV and CSV to JSON online. Handles nested objects with automatic flattening.

Markdown to HTML Converter

Convert Markdown to HTML with live preview. Free online Markdown to HTML converter.

HTML to Markdown Converter

Convert HTML to clean Markdown online. Handles headings, lists, links, images, code blocks, and tables.

TOML / JSON / YAML Converter

Convert between TOML, JSON, and YAML formats online. Bidirectional config file converter.

Testers

Regex Tester

Test and debug regular expressions online. Highlight matches and capture groups.

Diff Checker

Compare two text blocks and highlight differences online. Free text diff tool.

Cron Expression Parser

Parse and explain cron expressions online. View next run times and human-readable descriptions.

JSONPath Tester

Test JSONPath expressions against JSON data online. Live results with example expressions.