82 developer tools, zero uploads
Converters, encoders, hashes, generators, network calculators and text utilities — all of them run as plain JavaScript inside your own browser tab. Nothing you paste is ever sent to a server.
Crypto
Hashes, tokens, keys, ciphers and password tooling.
Token generator
Generate random strings with the alphabet you choose — API keys, passwords, nonces.
Hash text
Hash a string with MD5, SHA-1, SHA-256, SHA-512, SHA-3 or RIPEMD-160.
Bcrypt
Hash a password with bcrypt, or check a string against an existing bcrypt hash.
UUID generator
Generate RFC 4122 UUIDs — v1, v4 and v7 — in bulk.
ULID generator
Generate lexicographically sortable universally unique identifiers.
Encrypt / decrypt text
Encrypt and decrypt text with AES, TripleDES, Rabbit or RC4.
BIP39 passphrase
Generate a BIP39 mnemonic and its entropy, or convert an existing mnemonic back.
HMAC generator
Compute a keyed-hash message authentication code for any message.
RSA key pair generator
Generate an RSA public/private key pair in PEM format using the Web Crypto API.
Password strength analyser
Estimate a password’s entropy and how long a brute-force attack would take.
Converters
Move data between formats, encodings and notations.
Date & time converter
Convert between ISO 8601, Unix timestamps, RFC 7231, JS dates and more.
Integer base converter
Convert a number between binary, octal, decimal, hexadecimal and any base up to 64.
Roman numeral converter
Convert Arabic numbers to Roman numerals and back.
Base64 string encoder / decoder
Encode and decode text to and from Base64, with URL-safe support.
Base64 file converter
Turn any file into a Base64 data URI, or decode Base64 back into a file.
Color converter
Convert a color between HEX, RGB, HSL, HWB, LCH, CMYK and CSS names.
Case converter
Change text between camelCase, snake_case, kebab-case, Title Case and more.
Text to NATO alphabet
Spell text out using the NATO phonetic alphabet.
Text to binary
Convert text to its binary or hexadecimal ASCII representation and back.
Text to Unicode
Convert text to Unicode code points or HTML entities, and decode them again.
YAML to JSON
Convert a YAML document into formatted JSON.
JSON to YAML
Convert a JSON document into YAML.
YAML to TOML
Convert a YAML document into TOML.
TOML to YAML
Convert a TOML document into YAML.
JSON to TOML
Convert a JSON document into TOML.
TOML to JSON
Convert a TOML document into formatted JSON.
XML to JSON
Convert an XML document into JSON.
JSON to XML
Convert a JSON document into XML.
Markdown to HTML
Render Markdown to HTML and preview the result side by side.
List converter
Transform a list — split, prefix, suffix, sort, dedupe, reverse and join.
Web
Everyday utilities for building and debugging the web.
URL encoder / decoder
Percent-encode and decode URL strings and query components.
HTML entity escaper
Escape and unescape HTML entities so markup can be shown as text.
URL parser
Break a URL into protocol, host, port, path, query parameters and hash.
Device information
Show everything the browser reveals about your screen, device and connection.
Basic auth generator
Build an HTTP Basic Authorization header from a username and password.
Open Graph meta generator
Generate Open Graph and Twitter card meta tags for a page.
OTP code generator
Derive TOTP codes from a Base32 secret and build the matching otpauth URI.
MIME type lookup
Look up the MIME type for a file extension, or the extensions for a MIME type.
Keycode info
Press any key to see its JavaScript key, code, keyCode and modifiers.
Slugify string
Turn any string into a clean, URL-safe slug.
User-agent parser
Parse a user-agent string into browser, engine, OS and device.
HTTP status codes
Searchable reference of every HTTP response status code and its meaning.
JSON diff
Compare two JSON documents and list every added, removed and changed path.
JWT parser
Decode a JSON Web Token and inspect its header, payload and claim dates.
Safelink decoder
Recover the original URL from an Outlook SafeLinks or similar wrapped link.
Images & QR
Generate QR codes and placeholder graphics.
Development
Formatters, calculators and references for daily dev work.
JSON formatter
Prettify, minify and validate JSON, with optional key sorting.
SQL formatter
Format SQL for a specific dialect with consistent indentation and casing.
XML formatter
Prettify or minify an XML document.
YAML formatter
Validate and re-indent a YAML document.
Crontab generator
Build a cron expression and read back what it means in plain English.
Chmod calculator
Convert between symbolic and octal Unix file permissions.
Docker run to Compose
Convert a docker run command into a docker-compose service definition.
Random port generator
Pick random TCP ports outside the well-known and commonly used ranges.
Regex tester
Test a regular expression against sample text and inspect every match group.
Regex cheatsheet
Quick reference for regular expression syntax, classes and flags.
Git cheatsheet
The Git commands you keep forgetting, grouped by what you are trying to do.
Emoji picker
Search emoji and copy the character, code point or HTML entity.
Network
Subnetting, address maths and MAC utilities.
IPv4 subnet calculator
Work out network address, broadcast, mask, host range and size from CIDR.
IPv4 address converter
Convert an IPv4 address to decimal, hex, binary and IPv6 forms.
IPv4 range expander
Turn a start and end IP into the smallest CIDR block that contains them.
IP in range checker
Check whether an IPv4 address falls inside one or more CIDR ranges.
MAC address lookup
Find the vendor that owns a MAC address OUI prefix.
MAC address generator
Generate random MAC addresses in the separator format you need.
IPv6 ULA generator
Generate a RFC 4193 unique local IPv6 address prefix.
Math
Expression evaluation and quick calculators.
Measurement
Time, temperature and benchmark helpers.
Text
Inspect, diff, obfuscate and generate text.
Lorem ipsum generator
Generate placeholder paragraphs, sentences or words.
Text statistics
Count characters, words, lines, bytes and reading time for any text.
Text diff
Compare two blocks of text and highlight every insertion and deletion.
String obfuscator
Mask part of a sensitive string before sharing it.
Numeronym generator
Turn words into numeronyms — internationalization becomes i18n.
ASCII art text
Render text as ASCII art banners in a range of figlet fonts.
Data
Validate and parse real-world identifiers.