Free Online Developer Tools

Fast, free, and private. All tools run in your browser — your data never leaves your device.

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JSON Formatter

Format, validate, and beautify JSON data with syntax highlighting

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JSON Minifier

Minify and compress JSON data by removing whitespace

B64

Base64 Encode/Decode

Encode text to Base64 or decode Base64 back to text

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URL Encoder/Decoder

Encode or decode URL components and query strings

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HTML Entity Encoder

Encode and decode HTML entities for safe display

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Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes

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JWT

JWT Decoder

Decode and inspect JSON Web Tokens (header, payload, signature)

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Regex Tester

Test regular expressions with real-time matching and groups

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Diff Checker

Compare two texts and see differences highlighted

ID

UUID Generator

Generate UUIDs (v4) with bulk generation support

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Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

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Color Converter

Convert between HEX, RGB, and HSL color formats

CSV

CSV Converter

Convert between CSV and JSON formats with custom delimiters

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MD

Markdown Preview

Write Markdown and see rendered HTML preview in real time

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Cron Expression Parser

Parse cron expressions with human-readable descriptions and next run times

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Aa

Lorem Ipsum Generator

Generate placeholder text for designs, mockups, and development projects

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Tt

Text Case Converter

Convert text between UPPERCASE, camelCase, snake_case, kebab-case, and more

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Y/J

JSON to YAML Converter

Convert between JSON and YAML formats for config files and data exchange

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H→M

HTML to Markdown

Convert HTML code to clean Markdown syntax with headings, links, tables, and more

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SQL

SQL Formatter

Format and beautify SQL queries with proper indentation and keyword capitalization

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🔒

Password Generator

Generate strong, secure random passwords with customizable character sets

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0x

Number Base Converter

Convert between binary, octal, decimal, hex, and any base 2-36

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CSS

CSS Minifier

Minify CSS to reduce file size or beautify compressed CSS for readability

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$.

JSONPath Tester

Test JSONPath expressions against JSON data with real-time matching

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JS

JS Minifier

Minify JavaScript to reduce file size or beautify compressed JS for readability

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XML

XML Formatter

Format, validate, and beautify XML with proper indentation. Also minify XML.

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|T|

Markdown Table Generator

Create Markdown tables visually with a spreadsheet-like editor and CSV import

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Wc

Word & Character Counter

Count words, characters, sentences, paragraphs, and estimate reading time

QR

QR Code Generator

Create QR codes for URLs, text, WiFi, email. Download as PNG or SVG

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IMG

Image to Base64

Convert images to Base64 data URIs for embedding in HTML, CSS, or JavaScript

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TML

TOML to JSON Converter

Convert between TOML and JSON formats for Cargo.toml, pyproject.toml, and more

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/a-b

URL Slug Generator

Convert titles into SEO-friendly URL slugs with transliteration and stop word removal

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rwx

Chmod Calculator

Convert between numeric (755) and symbolic (rwxr-xr-x) Unix file permissions

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CSS Box Shadow Generator

Create CSS box-shadow effects with a visual editor. Multiple layers and presets

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HTTP

HTTP Status Codes

Complete reference of all HTTP response status codes with descriptions and use cases

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CSS Gradient Generator

Create linear, radial, and conic CSS gradients with a visual editor and presets

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16:9

Aspect Ratio Calculator

Calculate dimensions while maintaining aspect ratio for images, videos, and screens

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SEO

Meta Tag Generator

Generate SEO meta tags, Open Graph, and Twitter Cards with live search preview

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Favicon Generator

Create favicons from text, emoji, or initials. Download in multiple sizes

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Flexbox Playground

Visually explore CSS Flexbox with live preview. Adjust container and item properties

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\n

String Escape/Unescape

Escape and unescape strings for JSON, HTML, URL, XML, SQL, and more

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Color Palette Generator

Create harmonious color palettes with complementary, analogous, and triadic schemes

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Border Radius Generator

Create CSS border-radius with visual controls. Individual corners and presets

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Bx

Byte / Bit Counter

Calculate text size in bytes across UTF-8, UTF-16, ASCII encodings

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.env

.env Editor

Parse, sort, validate, and convert .env files to JSON, YAML, Docker, and shell formats

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{✓}

JSON Schema Validator

Validate JSON data against a JSON Schema with detailed error messages

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JS KeyCode Info

Press any key to see its keyCode, key, code, and modifier state

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OG

Open Graph Preview

Preview how your page looks when shared on Facebook, Twitter, LinkedIn, and Discord

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01

Text to Binary

Convert text to binary, hex, octal, and decimal with character breakdown table

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TS

JSON to TypeScript

Generate TypeScript interfaces from JSON data. Handles nested objects and arrays

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