Developer tools

Simply encode and decode strings into base64 with URL‑safe option

Generate a base64 basic auth header from a username and password.

Hash and compare text using bcrypt

Generate a BIP39 mnemonic from entropy, or derive entropy from mnemonic

Transform the case of a string and choose between different formats

Convert between HEX, RGB and HSL

Convert between multiple date/time formats and timestamps

Encrypt clear text and decrypt ciphertext with AES, TripleDES, RC4 or Rabbit

Generate SHA-1 and SHA-256 hashes

Hash a text string using SHA-1, SHA-256, SHA-384, or SHA-512

Compute HMAC with a secret key using SHA-1/256/384/512 and copy the result

Online HTML editor with live source preview.

Convert a number between bases (binary, octal, decimal, hex, base64, …)

Compare two JSON objects and highlight differences

Format and validate JSON data

Parse and convert JSON to TOML.

Convert JSON to XML.

Simply convert JSON to YAML with this online live converter.

Parse and decode JSON Web Tokens (header, payload, signature)

Find the javascript keycode, code, location and modifiers of any pressed key.

Process column‑based data: trim, dedupe, sort, wrap items/lists, and more.

Generate random lorem ipsum paragraphs for placeholders

Convert Markdown to HTML.

Evaluate math expressions with functions like sqrt, sin, cos, etc.

Generate open‑graph and socials HTML meta tags for your website.

Generate and validate time-based OTP (one time password) for multi-factor authentication.

Client-side strength and brute-force time estimation

Compute percentages, reverse percentages, and percent change

Generate and download QR codes with custom colors and error correction

Test and validate regular expressions

Convert Roman numerals to numbers and numbers to Roman numerals

Generate new RSA private and public keys (SPKI/PKCS8) with selectable bit size

Make a string url, filename and id safe.

Generate simple SVG placeholders with custom size, colors and text

Convert temperatures between Kelvin, Celsius, Fahrenheit and more

Count characters, words, lines, and byte size of text

Convert text to its ASCII binary representation and vice-versa

Transform text into the NATO phonetic alphabet for oral transmission

Parse and convert text to unicode and vice-versa

Generate random strings with customizable character sets

Parse and convert TOML to JSON.

Parse and convert TOML to YAML.

Encode or decode URL strings

Parse a URL into its separate constituent parts (protocol, origin, params, port, username, password, …)

Generate NIL, v1, v3, v4 and v5 UUIDs with copy & refresh

Create QR codes for WiFi networks (WPA/WPA2, WEP, or open)

Convert XML to JSON.

Simply convert YAML to JSON with this online live converter.

Parse and convert YAML to TOML.