Developer Tools

Convert CSV with quoted fields to JSON locally.

Compare two JSON documents locally in your browser.

Format, validate, and minify JSON locally in your browser.

Minify valid JSON locally in your browser.

Validate JSON data against a JSON Schema entirely in your browser.

Convert a JSON array of objects to CSV, preview it, and download it locally.

Convert compatible JSON data to TOML locally.

Convert JSON objects to simple XML locally.

Convert valid JSON to YAML locally.

Inspect and format JSON locally in your browser.

Convert TOML configuration into formatted JSON locally.

Convert TOML configuration into YAML locally.

Format and validate XML with readable indentation in your browser.

Parse simple XML into JSON locally.

Parse YAML and format it as JSON locally.

Convert YAML data into TOML configuration locally.

Parse YAML and inspect its structured JSON representation locally.

Encode or decode UTF-8 Base64 text locally in your browser.

Convert files to Base64 and decode Base64 back into downloadable files.

Convert special text characters and HTML entities locally in your browser.

Convert UTF-8 text and hexadecimal bytes locally.

Convert UTF-8 text and groups of 8-bit binary locally.

Spell letters with the NATO phonetic alphabet locally.

Convert text to Unicode escapes and back locally.

Encode or decode URL components locally without sending your text to a server.

Encrypt and decrypt text locally with AES-256-GCM and a password.

Create a Basic Authorization header locally.

Create a bcrypt password hash locally in your browser.

Create SHA hashes locally using your browser's Web Crypto API.

Create an HMAC locally with Web Crypto.

Decode a JSON Web Token payload locally. This tool does not verify signatures.

Generate a random password locally.

Estimate password entropy and character-set strength locally.

Generate a 2048-bit RSA-OAEP key pair and export PEM locally.

Generate a random token locally.

Generate a local six-digit TOTP code from a Base32 secret.

Generate sortable ULIDs using browser cryptographic randomness.

Generate one or many UUID v4 values.

Convert cURL commands to JavaScript Fetch and Python Requests locally.

Look up common HTTP status codes locally.

Inspect key, code, modifiers, and legacy keyCode for a keyboard event.

Create title, description, and Open Graph tags locally.

Look up common file extensions and MIME types locally.

Create a QR code from text or a URL locally.

Turn a title or phrase into a clean URL slug.

Break a URL into its protocol, host, path, and parameters.

Inspect a user-agent string for browser, operating system, and device clues.

Create a downloadable Wi-Fi connection QR code locally.

Turn highlighted source code into a polished PNG with themes, line numbers, and background controls.

Normalize, validate, deduplicate, and lowercase email address lists.

Remove comments and redundant whitespace from simple HTML, CSS, or JavaScript locally.

Format JavaScript with a local browser formatter.

Convert Markdown into sanitized HTML in your browser.

Create clear diagrams for technical documents, reports, papers, and presentations, then export publication-ready SVG or high-resolution PNG.

Test JavaScript regular expressions with live matches.

Format SQL statements locally in your browser.

Compare two pieces of text and see changed lines.

Build a numeric chmod command from owner, group, and other permissions.

Build a five-field cron expression locally.

Convert a simple docker run command into Compose YAML locally.

Build common Git commands without running them.

View browser-visible device and environment information locally.

Expand small IPv4 ranges into an address list locally.

Convert an IPv4 address to binary, integer, and hexadecimal locally.

Calculate an IPv4 network, mask, broadcast, and usable range locally.

Generate a random locally assigned IPv6 ULA /48 prefix.

Generate locally administered random MAC addresses locally.

Look up a MAC address prefix in a bundled IEEE OUI database.

Generate random unprivileged port numbers locally.

Convert Unix timestamps and readable dates in your browser.

Parse a Cookie header into structured JSON locally.

Test a CSS selector against pasted HTML and inspect matches.

Extract unique links from pasted HTML without fetching a page.

Extract title, description, canonical, robots, and Open Graph metadata.

Parse pasted HTTP headers into structured JSON.

Extract and parse JSON-LD blocks from pasted HTML.

Build a JSON request-header object from key and value lines.

Generate a basic robots.txt from a list of disallowed paths.

Test a path against pasted Allow and Disallow rules.

Generate a standards-based XML sitemap from a URL list.

Parse a sitemap and validate its URL locations locally.

Validate, trim, and deduplicate a list of URLs.

Normalize URL hosts, ports, fragments, and query ordering.

Extract repeated and single query parameters from a URL.

Test an XPath expression against pasted HTML locally.