Developer Tools

.htaccess & Nginx Redirect Generator

Convert old-to-new URL mappings into Apache .htaccess or Nginx redirect rules.

AES Text Encryption & Decryption

Encrypt or decrypt text locally with AES-GCM and a password-derived key.

Base64 Encoder Decoder

Encode and decode Base64 text instantly.

Binary, Decimal & Hex Converter

Convert integers between binary, octal, decimal and hexadecimal representations.

Code Secret Scanner

Scan pasted code for patterns resembling exposed API keys, tokens, private keys and credentials.

Color Contrast Checker

Check WCAG contrast ratio between two colors.

Cron Expression Generator

Build common cron expressions quickly.

CSP Header Builder & Validator

Build and inspect a Content-Security-Policy header with common directives and safe defaults.

CSR Generator

Generate a private key and certificate signing request in your browser.

CSS Beautifier

Beautify and format CSS code.

CSS Box Shadow Generator

Create and preview CSS box-shadow values including inset, blur, spread and colour.

CSS clamp() Fluid Type Generator

Generate responsive CSS clamp values from minimum, maximum and viewport measurements.

CSS Gradient Generator

Build linear or radial CSS gradients with adjustable angle, colours and stop positions.

CSS Grid & Flexbox Layout Builder

Generate responsive Grid or Flexbox CSS and preview a configurable multi-item layout.

CSS Minifier

Minify CSS code instantly.

CSV Cleaner & Validator

Detect delimiters, normalize row widths, identify malformed rows and export cleaned CSV.

CSV Splitter & Merger

Split a CSV by row count or merge compatible CSV files with one shared header.

CSV to JSON Converter

Convert CSV rows into formatted JSON objects.

DNS Zone File Validator & Conflict Checker

Inspect pasted DNS zone records for common syntax errors, duplicates, CNAME conflicts and mail-record issues.

File Checksum Verifier

Calculate a local file checksum and compare it with an expected SHA-256, SHA-384 or SHA-512 value.

Font Converter

Convert TTF, OTF, WOFF and WOFF2 fonts locally.

Hash Generator

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

HEX, RGB & HSL Color Converter

Convert colours between HEX, RGB and HSL while previewing the normalized result.

HMAC Generator & Signature Verifier

Generate or verify HMAC-SHA-256, SHA-384 or SHA-512 signatures locally in the browser.

HTML Accessibility Markup Checker

Check pasted HTML for common alternative-text, label, heading, link, landmark, language and duplicate-ID problems.

HTML Beautifier

Beautify and indent your HTML code.

HTML Email Preview

Preview responsive HTML email code safely in a sandbox.

HTML Entity Encoder & Decoder

Encode reserved HTML characters or decode named and numeric HTML entities.

HTML Error Validator

Check a public page with the W3C-compatible Nu validation service.

HTML Minifier

Minify HTML code instantly.

HTML Table Generator

Turn CSV-style data into accessible responsive HTML table markup with optional headers and caption.

HTTP Request & cURL Builder

Build a readable cURL command from a URL, method, headers, authentication and optional request body.

JS Minifier

Minify JavaScript code instantly.

JSON ↔ XML Converter

Convert JSON objects and arrays to XML or turn ordinary XML elements into JSON.

JSON ↔ YAML Converter

Convert structured data between JSON and a practical safe YAML subset in the browser.

JSON Diff & JSON Patch Generator

Compare two JSON documents and create an RFC 6902-style patch with readable change details.

JSON Formatter

Format, validate, minify, and copy JSON.

JSON Schema Validator

Validate JSON against common schema rules including types, properties, required fields, arrays and patterns.

JSON to CSV Converter

Convert an array of JSON objects into CSV.

JSONL ↔ JSON Converter

Convert newline-delimited JSON records to a JSON array and back with row-level validation.

JWT Decoder

Decode JWT header and payload safely.

Line Ending Converter

Convert text files between LF, CRLF and CR line endings and download a clean copy.

Lorem Ipsum Generator

Generate placeholder text for layouts.

Markdown ↔ HTML Converter

Convert common Markdown formatting to sanitized HTML or readable HTML back to Markdown.

MIME & File Type Inspector

Inspect local file signature bytes, browser MIME type, extension, size and modification date.

OpenAPI & Swagger JSON Validator

Validate a JSON OpenAPI or Swagger document and summarize paths, methods, parameters and response coverage.

Password Generator

Generate secure random passwords.

Permissions-Policy Header Generator

Build a Permissions-Policy header for browser capabilities such as camera, microphone and geolocation.