Free Online Developer Tools

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JSON Formatter

Format, validate and minify JSON. Collapsible tree view. Highlights syntax errors. Auto-saves last input.

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✅

JSON Validator

Validate JSON syntax and highlight errors with exact line and column reference.

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📊

JSON to CSV

Convert a JSON array of objects to CSV format. Preview table and download as .csv file.

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🔄

CSV to JSON

Convert CSV data to a JSON array. Supports header row mapping and custom delimiters.

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HTML Formatter

Prettify and format raw or minified HTML with configurable indent size. Copy formatted output instantly.

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🔐

HTML Encoder / Decoder

Encode special HTML characters (< > & " ') and decode HTML entities back to plain text.

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🎨

CSS Formatter

Prettify and format minified or messy CSS code. Configurable indent size and brace style.

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🗜️

CSS Minifier

Remove whitespace and comments from CSS. Shows before/after file size and percentage reduction.

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JS

JS Formatter

Prettify JavaScript code with configurable indent size. Handles ES6+ syntax including arrow functions and template literals.

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⚡

JS Minifier

Minify JavaScript by removing whitespace and comments. Shows size reduction percentage.

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🗄️

SQL Formatter

Format SQL queries for readability. Handles SELECT, INSERT, UPDATE, DELETE and JOIN clauses.

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📄

XML Formatter

Pretty-print and validate XML. Highlights syntax errors with line reference. Configurable indent.

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🔒

Base64 Encoder

Encode text or file contents to Base64 string. Supports UTF-8 and binary file input.

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🔓

Base64 Decoder

Decode Base64 string back to plain text or download as a binary file.

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🔗

URL Encoder

Percent-encode URLs or query strings using encodeURIComponent. Encode full URLs or individual parameters.

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🔍

URL Decoder

Decode percent-encoded URL strings back to readable text. Handles %20, +, and all special characters.

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Regex Tester

Test regular expressions against strings with live match highlighting. Supports all JS regex flags. Auto-save.

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🪙

JWT Decoder

Decode JWT header, payload and verify signature structure. View expiry, issuer and claims at a glance.

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MD5 Generator

Generate an MD5 hash from any text string. Instant client-side computation. Copy to clipboard.

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🔑

SHA-256 Generator

Generate SHA-256 hash using the browser's native Web Crypto API. Supports text and file input.

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🆔

UUID Generator

Generate version 4 UUIDs using crypto.randomUUID(). Bulk generation up to 100 UUIDs at once.

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🔑

Htpasswd Generator

Generate Apache .htpasswd entries using MD5-APR1 or SHA-1 algorithms entirely in the browser.

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⏱️

Cron Expression Generator

Build and explain cron expressions with a GUI. See the next 5 run times. Auto-saves last expression.

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🎨

Color Picker

Visual color picker returning HEX, RGB, HSL and CMYK values. Copy any format to clipboard.

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