Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Watt-hours to joules converter
exact 3600 factor, free
POST /conv/watt-hours-to-joules$0.002Developer Utilities
Watts to horsepower converter
exact mechanical factor, free
POST /conv/watts-to-horsepower$0.002Developer Utilities
Yards to feet converter
exact factor, free in browser
POST /conv/yards-to-feet$0.002Developer Utilities
Aadhaar Verhoeff check digit
compute or validate 12-digit UID free
POST /enc/aadhaar-india$0.002Developer Utilities
ABA routing check digit
compute from 8 digits or validate a 9-digit RTN
POST /enc/aba-routing$0.002Developer Utilities
Able Baker alphabet
spell or decode Joint Army/Navy code words, free
POST /enc/able-baker$0.002Developer Utilities
Australian Business Number (ABN) check
modulo-89 validator
POST /enc/abn-australia$0.002Developer Utilities
Australian ACN check digit
compute and validate free online
POST /enc/acn-australia$0.002Developer Utilities
ADFGVX cipher
encrypt & decrypt with square and transposition keys, free
POST /enc/adfgvx$0.002Developer Utilities
ADFGX cipher
encrypt or decrypt with Polybius and transposition, free
POST /enc/adfgx$0.002Developer Utilities
Adler-32 checksum calculator
zlib-style hex 32-bit
POST /enc/adler32$0.002Developer Utilities
Albam Hebrew cipher
swap alphabet halves, encode & decode free
POST /enc/albam$0.002Developer Utilities
btoa Ascii85 encoder
encode or decode original btoa dialect, free
POST /enc/ascii85-btoa$0.002Developer Utilities
ASL fingerspelling translator
handshapes for letters & digits, free
POST /enc/asl-fingerspell$0.002Developer Utilities
Cyrillic Atbash cipher
mirror Russian letters (А↔Я), free online
POST /enc/atbash-cyrillic$0.002Developer Utilities
Greek Atbash cipher
mirror the Greek alphabet (Α↔Ω), free online
POST /enc/atbash-greek$0.002Developer Utilities
AZERTY ↔ QWERTY converter
remap text by keyboard layout, free
POST /enc/azerty-qwerty$0.002Developer Utilities
Bijective base-26 encoder
spreadsheet columns A, Z, AA free
POST /enc/base26-bijective$0.002Developer Utilities
Base32768 encoder & decoder
15 bits per character for UTF-16, free
POST /enc/base32768$0.002Developer Utilities
Crockford Base32 encoder & decoder
human-friendly alphabet, free
POST /enc/base32-crockford$0.002Developer Utilities
z-base-32 encoder & decoder
Zooko alphabet, free online
POST /enc/base32-zbase$0.002Developer Utilities
Base58Check encoder & decoder
Bitcoin double-SHA256 checksum
POST /enc/base58-check$0.002Developer Utilities
Ripple Base58 encoder & decoder
XRP alphabet, free online
POST /enc/base58-ripple$0.002Developer Utilities
bcrypt Base64 encoder & decoder
OpenBSD alphabet, free
POST /enc/base64-bcrypt$0.002Developer Utilities
OpenPGP Radix-64 encoder
Base64 armor with CRC-24 checksum
POST /enc/base64-radix64$0.002Developer Utilities
Git Base85 encoder
binary patch length-prefix encode and decode
POST /enc/base85-git$0.002Developer Utilities
basE91 encoder
encode or decode text denser than Base64, free
POST /enc/base91$0.002Developer Utilities
Base94 encoder & decoder
all 94 printable ASCII chars, free
POST /enc/base94$0.002Developer Utilities
Negabinary converter
base −2 without a sign bit, free
POST /enc/base-negabinary$0.002Developer Utilities
Golden ratio base converter
base φ (phinary) free online
POST /enc/base-phi$0.002Developer Utilities
Quaternary (base-4) converter
decimal ↔ base 4 free
POST /enc/base-quaternary$0.002Developer Utilities
Senary base-6 converter
decimal ↔ base-6 for dice and counting, free
POST /enc/base-senary$0.002Developer Utilities
Baudot ITA2 encoder
five-bit teleprinter LTRS/FIGS, free
POST /enc/baudot$0.002Developer Utilities
BIP-39 mnemonic encoder
entropy hex to seed phrase with checksum
POST /enc/bip39$0.002Developer Utilities
Unicode bold italic text
plain letters ↔ 𝑨𝒃𝒄 style, free
POST /enc/bold-italic-unicode$0.002Developer Utilities
Book cipher
encrypt & decrypt by word position in a passage
POST /enc/book-cipher$0.002Developer Utilities
Brainfuck text encoder
generate or run BF that prints text, free
POST /enc/brainfuck-encode$0.002Developer Utilities
BSD checksum calculator
classic sum rotate-and-add 16-bit
POST /enc/bsd-sum$0.002Developer Utilities
Netherlands BSN check
eleven-test validate and compute free
POST /enc/bsn-netherlands$0.002Developer Utilities
C string escaper
escape & unescape backslash, quotes, octal, hex
POST /enc/c-escape$0.002Developer Utilities
Cyrillic Caesar cipher
shift Russian letters, encode & decode free
POST /enc/caesar-cyrillic$0.002Developer Utilities
CAS Registry Number check digit
compute and validate free
POST /enc/cas-number$0.002Developer Utilities
Chaocipher
encrypt & decrypt with two evolving alphabets, free
POST /enc/chaocipher$0.002Developer Utilities
China resident ID check digit
ISO 7064 mod 11-2 free
POST /enc/china-id$0.002Developer Utilities
Ecuador cédula check digit
modulo-10 coefficient method free
POST /enc/ci-ecuador$0.002Developer Utilities
Unicode circled letters
bubble text A–Z & digits, free
POST /enc/circled-unicode$0.002Developer Utilities
Romanian CNP check digit
compute and validate free online
POST /enc/cnp-romania$0.002Developer Utilities
Brazil CNPJ check digits
compute 12 base digits or validate 14
POST /enc/cnpj-brazil$0.002Developer Utilities
Colemak QWERTY converter
translate key positions both ways, free
POST /enc/colemak-qwerty$0.002Developer Utilities
Cologne phonetics encoder
Kölner Phonetik codes for German names
POST /enc/cologne-phonetic$0.002Developer Utilities
Double columnar transposition
encrypt decrypt with two keys, free
POST /enc/columnar-double$0.002Developer Utilities
Brazil CPF check digits
compute and validate free
POST /enc/cpf-brazil$0.002Developer Utilities
Denmark CPR check
validate Danish personnummer date and mod-11
POST /enc/cpr-denmark$0.002Developer Utilities
CRC-16 Kermit checksum
reflected CCITT poly hex residual of text
POST /enc/crc16-kermit$0.002Developer Utilities
CRC-16 Modbus checksum
compute hex CRC for RTU frames
POST /enc/crc16-modbus$0.002Developer Utilities
CRC-16 XMODEM checksum
zero-seed CCITT poly 0x1021 hex
POST /enc/crc16-xmodem$0.002Developer Utilities
CRC-32 checksum
IEEE / ZIP / PNG hex calculator, free
POST /enc/crc32$0.002Developer Utilities
CRC-64 checksum
ECMA polynomial hex residual of text
POST /enc/crc64$0.002Developer Utilities
CRC-8 checksum calculator
standard poly 0x07 hex byte
POST /enc/crc8$0.002Developer Utilities
CSV field quoter
quote & unquote one field per RFC 4180
POST /enc/csv-quote$0.002