Handy tools, no clutter.

Generate a random, secure token with a custom length and character sets.

Generate random RFC 4122 version-4 UUIDs, with options for quantity, case, and hyphens.

Hash text with SHA-1, SHA-256, SHA-384, and SHA-512.

Compute an HMAC signature from a message and a secret key.

Generate sortable, unique ULID identifiers.

Hash a password with bcrypt, or check a password against a hash.

Generate a BIP39 mnemonic seed phrase.

Generate an RSA public/private key pair (PEM).

Estimate a password's entropy and crack time.

Encrypt and decrypt text with AES-GCM and a passphrase.

Check whether a PDF contains a digital signature.

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

Encode and decode text to and from Base64 (UTF-8 safe).

Encode a file into a Base64 data URL.

Convert numbers between bases — binary, octal, decimal, hex, and any base 2–36.

Convert numbers to Roman numerals and back (1–3999).

Convert between Celsius, Fahrenheit, and Kelvin.

Convert a color between HEX, RGB, HSL, HSV, and CMYK.

Check the WCAG contrast ratio between a text and background color.

Generate TypeScript interfaces from a JSON sample.

Convert between ISO, Unix timestamps, UTC, and local time.

Spell text out using the NATO phonetic alphabet.

Convert text to its binary representation and back.

Convert text to U+ code points and back.

Convert YAML into formatted JSON.

Convert JSON into YAML.

Render Markdown to HTML with a live preview.

Convert TOML into JSON.

Convert JSON into TOML.

Convert YAML into TOML.

Convert TOML into YAML.

Convert XML into JSON.

Convert JSON into XML.

Encode or decode a string for safe use in a URL.

Break a URL into its parts and query parameters.

Convert a curl command into fetch, axios, or Python requests code.

Visually build box-shadow and gradient CSS.

A searchable reference of HTTP request & response headers.

Turn text into a clean, URL-friendly slug.

Escape or unescape HTML entities in a string.

Build an HTTP Authorization header from a username and password.

Decode and inspect a JSON Web Token’s header and payload (no signature check).

Search a reference of common HTTP status codes.

Generate Open Graph and Twitter meta tags for your page.

Show the JavaScript key, code, and keyCode for any pressed key.

Inspect your screen, viewport, and browser details.

Unwrap Outlook SafeLinks and similar URL redirectors.

Generate time-based one-time passwords from a base32 secret.

Parse a user-agent string into browser, OS, and device.

Normalize email addresses (strip +tags, Gmail dots).

Look up MIME types by file extension.

Edit rich text and get the HTML output.

Generate a QR code from text or a URL, with custom colors.

Generate a lightweight SVG placeholder image.

Create a QR code that connects devices to a WiFi network.

Record video from your webcam and download it.

Build a Unix file-permission value (octal + symbolic) with checkboxes.

Generate realistic fake data (names, emails, UUIDs…) as JSON.

A searchable reference of common Docker & Compose commands.

A searchable reference of common kubectl (Kubernetes) commands.

A searchable reference of common shell commands and operators.

A searchable reference of Vim motions, editing, and commands.

A searchable reference of SQL queries, joins, and clauses.

A searchable reference of semantic-versioning ranges and rules.

Generate random port numbers above the well-known range (1024–65535).

Minify or prettify a JSON document.

Convert a JSON array of objects into CSV.

Format and beautify an SQL query.

Describe a cron expression in plain language.

Compare two JSON documents and list the differences.

Test a regular expression against a string and see matches.

Validate and normalise a YAML document.

Format and indent an XML document.

Format, sort, and validate a JSON document.

Convert a docker run command into a docker-compose service.

A searchable reference of common git commands.

A searchable reference of regular-expression tokens.

Generate random, locally-administered MAC addresses.

Convert an IPv4 address to decimal, hex, binary, and IPv6.

Calculate network, broadcast, mask and host range from a CIDR.

Find the smallest CIDR block that covers a start–end IPv4 range.

Generate a unique local IPv6 address prefix (RFC 4193).

Look up the vendor for a MAC address (OUI).

Generate placeholder paragraphs of lorem ipsum text.

A searchable reference of Markdown syntax.

Count characters, words, lines, and sentences in your text.

Sort, deduplicate, trim, and transform a list (one item per line).

Mask the middle of a string, keeping a few characters visible.

Create numeronyms like i18n from words.

Remove duplicate lines from a block of text, with options for case, trimming, and empty lines.

Compare two blocks of text line by line.

Turn text into ASCII art (FIGlet).

Search emoji and click to copy.

Common percentage calculations: percent of a value, ratios, and change.

Estimate the remaining time and finish time of a task in progress.

Evaluate a mathematical expression.

A simple stopwatch with lap times.

Compare measurements and see relative ratios (lower is faster).

Validate and break down an IBAN.

Parse and format a phone number to E.164, national, and international.