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
Unicode code point converter
characters ↔ U+XXXX, free
POST /enc/unicode-codepoint$0.002Developer Utilities
URL percent encoder & decoder
escape reserved characters, free
POST /enc/url$0.002Developer Utilities
UTF-8 byte encoder
text to hex bytes & decode, free
POST /enc/utf8-bytes$0.002Developer Utilities
XOR cipher
encrypt or decrypt with a repeating key, free online
POST /enc/xor$0.002Developer Utilities
Base62 number converter
integer to or from base-62 (0-9A-Za-z), free
POST /fmt/base62$0.002Developer Utilities
Binary to hex converter
base-2 string to base-16 value, free
POST /fmt/binary-hex$0.002Developer Utilities
Chinese number converter
everyday & financial numerals
POST /fmt/chinese-numerals$0.002Developer Utilities
Number to currency words
spell money for cheque writing (e.g. 1250.50 → one thousand two hundred fifty and 50/100), free
POST /fmt/currency-words$0.002Developer Utilities
Decimal to binary converter
whole number to base-2 string, free
POST /fmt/decimal-binary$0.002Developer Utilities
Decimal to fraction converter
reduced numerator/denominator, free
POST /fmt/decimal-fraction$0.002Developer Utilities
Decimal to octal converter
base-10 to base-8, free
POST /fmt/decimal-octal$0.002Developer Utilities
Decimal to percent converter
0.25 to 25%, free online
POST /fmt/decimal-percent$0.002Developer Utilities
Duodecimal converter
base-10 ↔ base-12 with dek (X) and el (E), free
POST /fmt/duodecimal$0.002Developer Utilities
Fraction to decimal converter
turn a/b into a decimal value, free
POST /fmt/fraction-decimal$0.002Developer Utilities
Gray code converter
binary ↔ reflected Gray, free
POST /fmt/gray-code$0.002Developer Utilities
Hex to binary converter
base-16 string to base-2 bits, free
POST /fmt/hex-binary$0.002Developer Utilities
Hex to decimal converter
base-16 string to integer, free
POST /fmt/hex-decimal$0.002Developer Utilities
Float to IEEE-754 converter
hex and binary bit pattern, free
POST /fmt/ieee754$0.002Developer Utilities
Spell a number in English
words for integers, decimals, negatives
POST /fmt/number-to-words-en$0.002Developer Utilities
Spell a number in Spanish
formal words for any integer, free
POST /fmt/number-to-words-es$0.002Developer Utilities
Percent to decimal converter
percentage to decimal (e.g. 25% → 0.25), free
POST /fmt/percent-decimal$0.002Developer Utilities
Large Roman numerals converter
vinculum overlines above 3999, free
POST /fmt/roman-large$0.002Developer Utilities
Number rounding tool
decimals, nearest ten, hundred or thousand, free
POST /fmt/rounding$0.002Developer Utilities
Scientific notation converter
decimal ↔ mantissa×10^n, free
POST /fmt/scientific-notation$0.002Developer Utilities
Ordinal words converter
spell 1st, 21st, 100th in English
POST /fmt/spell-ordinal$0.002Developer Utilities
Thai numeral converter
Western digits ↔ Thai ๐-๙ integers, free
POST /fmt/thai-numerals$0.002Developer Utilities
Add thousands separators
format numbers with grouped digits, free
POST /fmt/thousands-separator$0.002Developer Utilities
Two's complement converter
signed integer ↔ fixed-width binary, free
POST /fmt/twos-complement$0.002Developer Utilities
Antipode coordinates calculator
opposite point on Earth from lat/lon, free
POST /geo/antipode$0.002Developer Utilities
Bearing to compass direction
degrees to N, NNE, NE… free
POST /geo/bearing-to-compass$0.002Developer Utilities
Point-radius bounding box
min/max lat lon from center, free
POST /geo/bounding-box$0.002Developer Utilities
Cross-track distance calculator
signed offset from a great-circle path, free
POST /geo/cross-track-distance$0.002Developer Utilities
Decimal degrees to DMS converter
degrees, minutes, seconds and hemisphere, free
POST /geo/decimal-to-dms$0.002Developer Utilities
Length of a degree of latitude
WGS-84 ground distance, free
POST /geo/degree-length-latitude$0.002Developer Utilities
Length of a degree of longitude
ground distance at any latitude (WGS84), free
POST /geo/degree-length-longitude$0.002Developer Utilities
Destination point calculator
great-circle lat/lon from bearing and distance, free
POST /geo/destination-point$0.002Developer Utilities
DMS to decimal degrees converter
hemisphere letter, free
POST /geo/dms-to-decimal$0.002Developer Utilities
Equirectangular distance
fast lat/lon distance approximation, free
POST /geo/equirectangular-distance$0.002Developer Utilities
Great-circle interpolation
intermediate lat/lon between two points, free
POST /geo/geodesic-interpolate$0.002Developer Utilities
Geohash bounding box
lat/lon corners from geohash, free
POST /geo/geohash-bbox$0.002Developer Utilities
Geohash neighbors finder
8 adjacent cells, free
POST /geo/geohash-neighbors$0.002Developer Utilities
Web map scale calculator
zoom, latitude & DPI to 1:N, free
POST /geo/map-scale$0.002Developer Utilities
Web Mercator meters per pixel
ground resolution from zoom and latitude, free
POST /geo/meters-per-pixel$0.002Developer Utilities
Lat lon to MGRS
military grid reference from coordinates, free
POST /geo/mgrs-from-latlon$0.002Developer Utilities
MGRS to lat/lon
military grid reference south-west corner to WGS84, free
POST /geo/mgrs-to-latlon$0.002Developer Utilities
Point in polygon checker
test if a point lies inside a polygon, free
POST /geo/point-in-polygon$0.002Developer Utilities
Polygon centroid calculator
area-weighted lat/lon center
POST /geo/polygon-centroid$0.002Developer Utilities
Bing Maps quadkey decoder
tile X, Y and zoom from a quadkey string, free
POST /geo/quadkey-decode$0.002Developer Utilities
Tile to Bing Maps quadkey
X/Y/zoom to quadkey string, free
POST /geo/quadkey-encode$0.002Developer Utilities
Rhumb line bearing calculator
constant course between two points, free
POST /geo/rhumb-bearing$0.002Developer Utilities
Rhumb line destination point
lat/lon from constant bearing and distance, free
POST /geo/rhumb-destination$0.002Developer Utilities
Lat/lon to map tile
Web Mercator slippy X/Y from coordinates and zoom, free
POST /geo/tile-from-latlon$0.002Developer Utilities
Lat lon to UTM converter
zone, easting, northing, free
POST /geo/utm-from-latlon$0.002Developer Utilities
Vincenty distance calculator
WGS-84 ellipsoidal geodesic, free
POST /geo/vincenty-distance$0.002Developer Utilities
Web Mercator unproject
meters to lat/lon (EPSG:3857), free
POST /geo/web-mercator-unproject$0.002Developer Utilities
Arc length calculator
sector area from radius and central angle
POST /geom/arc-length$0.002Developer Utilities
Barrel volume calculator
estimate cask volume from top radius, middle radius and height
POST /geom/barrel$0.002Developer Utilities
Circle equation calculator
standard & general form, area, circumference
POST /geom/circle-equation$0.002Developer Utilities
Circle–line intersection
find 0, 1 or 2 points from center, radius and line
POST /geom/circle-line-intersection$0.002Developer Utilities
Cube calculator
volume, surface area and diagonals from edge, volume or area
POST /geom/cube$0.002