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⚙️ Developer UtilitiesFree
ROT18 cipher
Hello, World! 123 becomes Uryyb, Jbeyq! 678 in one pass: letters move 13 places and digits move five, while spaces and punctuation stay put.
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⚙️ Developer UtilitiesFree
ROT5 digit cipher
0123456789 becomes 5678901234: each digit moves five places on a circle of ten, while letters, spaces and dashes stay where they are.
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⚙️ Developer UtilitiesFree
Tap code translator
Type HI and get 2,3 2,4: H sits in row 2, column 3 of the 5×5 Polybius square and I in row 2, column 4, also shown as dots for tapping.
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⚙️ Developer UtilitiesFree
Trifid cipher
With the keyword KEYWORD and period 5, DEFENDTHEEAST encrypts to ERKQJAYHKOBQL. Each letter becomes three cube coordinates that are then regrouped, mixing…
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⚙️ Developer UtilitiesFree
Unicode code point converter
Type Hi and get U+0048 U+0069, one code point per character, with an emoji kept as a single value such as U+1F600 instead of two broken halves.
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⚙️ Developer UtilitiesFree
URL percent encoder & decoder
hello world & café becomes hello%20world%20%26%20caf%C3%A9, safe to drop into a link. Choose between encoding a single value, where & = ? / are escaped too, or…
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⚙️ Developer UtilitiesFree
UTF-8 byte encoder
Find the exact UTF-8 bytes of any word or phrase: “Hi” becomes the hex pairs 48 69, one pair per byte, and pasted hex decodes back to the original characters.
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⚙️ Developer UtilitiesFree
XOR cipher
XORs your text with a repeating key and shows the result as hex: “Hello” with the key “key” becomes 230015070a, and the same key turns it back into text.
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📏 Unit convertersFree
Base62 number converter
1000 in base 62 is G8: this converter turns whole numbers into short, link-friendly codes built from digits, capital letters and small letters, and decodes them…
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📏 Unit convertersFree
Binary to hex converter
1010 in binary is A in hexadecimal: each group of four bits becomes one hex digit, so long runs of zeros and ones turn into short, readable values for masks…
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📏 Unit convertersFree
Chinese number converter
1234 becomes 一千二百三十四 in everyday Chinese numerals: convert whole numbers into common or anti-fraud financial characters for receipts, invoices and lessons, or…
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📏 Unit convertersFree
Number to currency words
1250.50 becomes one thousand two hundred fifty and 50/100, the wording banks expect on the written line of a cheque: enter the amount and copy the phrase.
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📏 Unit convertersFree
Decimal to binary converter
42 in binary is 101010, six bits long: enter any whole number and get its binary digits for homework, bit masks or permission flags. Free in your browser.
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📏 Unit convertersFree
Decimal to fraction converter
0.75 is 3/4 and 0.(3) is exactly 1/3: enter a finite or repeating decimal and get the fraction already reduced to lowest terms, ready for homework or a recipe.
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📏 Unit convertersFree
Decimal to octal converter
64 in decimal is 100 in octal, because eight times eight is sixty-four: enter a whole number and get its base-8 digits, with negative numbers keeping their…
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📏 Unit convertersFree
Decimal to percent converter
0.25 becomes 25%: the converter multiplies any decimal by 100, so a rate stored as 0.073 reads as 7.3% on a label or a report, and negatives keep their sign.
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📏 Unit convertersFree
Duodecimal converter
144 in decimal is 100 in base 12, because it is exactly twelve dozens: convert whole numbers to dozenal digits, with X for ten and E for eleven, or decode them…
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📏 Unit convertersFree
Fraction to decimal converter
3/8 is 0.375 and 6/8 is 0.75, shown reduced as 3/4: enter the top and bottom numbers and get the decimal, with a clear warning instead of nonsense if the bottom…
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📏 Unit convertersFree
Gray code converter
Binary 1011 becomes Gray 1110 here, and Gray converts back to binary just as exactly, with leading zeros kept so a fixed-width answer stays fixed.
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📏 Unit convertersFree
Hex to binary converter
0xFF in binary is 11111111: each hex digit maps to four bits, so F becomes 1111. Paste a value with or without the 0x prefix and get both the short binary and…
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📏 Unit convertersFree
Hex to decimal converter
0xFF is 255 in decimal: fifteen times sixteen plus fifteen. Paste any hex value, with or without 0x and in either case, and see the decimal result together with…
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📏 Unit convertersFree
Float to IEEE-754 converter
3.14 in double precision is stored as 0x40091EB851EB851F: one sign bit, eleven exponent bits and 52 significand bits, each shown separately.
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📏 Unit convertersFree
Spell a number in English
1234 becomes one thousand two hundred thirty-four, in American English with hyphenated tens and no and after hundred.
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📏 Unit convertersFree
Spell a number in Spanish
1234 in Spanish is mil doscientos treinta y cuatro, written the formal way you would put on a cheque or a contract.
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📏 Unit convertersFree
Percent to decimal converter
25% is 0.25 as a decimal: a percent means parts per hundred, so you simply divide by 100. Paste values with or without the % sign, including 12.5, values above…
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📏 Unit convertersFree
Large Roman numerals converter
4000 becomes I̅V̅ in Roman numerals: the bar over the letters multiplies them by a thousand, while 2024 stays plain MMXXIV.
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📏 Unit convertersFree
Number rounding tool
3.14159 rounded to two decimal places is 3.14, and an exact half always moves away from zero, so 2.5 becomes 3 and -2.5 becomes -3.
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📏 Unit convertersFree
Scientific notation converter
1234.5 in scientific notation is 1.2345e3: a mantissa between 1 and 10 times ten to the third. Expand e-notation back to plain digits just as easily, for lab…
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📏 Unit convertersFree
Ordinal words converter
21 becomes twenty-first, with 21st alongside when space is tight. Only the last word turns into a rank, so one hundred one reads one hundred first, never oneth…
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📏 Unit convertersFree
Thai numeral converter
2026 in Thai numerals is ๒๐๒๖: each digit is swapped for its Thai shape and the value stays the same.
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📏 Unit convertersFree
Add thousands separators
1234567.89 becomes 1,234,567.89 in US style with two decimals, while European style writes 1,234,000 as 1.234.000.
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📏 Unit convertersFree
Two's complement converter
-5 in 8 bits is 11111011, the exact pattern a register holds, and 11111011 decodes back to -5. Values that do not fit the width, such as 128 in 8 bits, are…
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🧭 Travel & geographyFree
Antipode coordinates calculator
The antipode of New York (40.7128° N, 74.006° W) is 40.7128° S, 105.994° E: the latitude flips sign and the longitude moves 180°.
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🧭 Travel & geographyFree
Bearing to compass direction
A bearing of 22.5° reads as NNE, North-Northeast, and −45° wraps round to NW. Enter any heading in degrees and get the nearest of the 16 classic compass…
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🧭 Travel & geographyFree
Point-radius bounding box
A 5000 m radius around 40.7128, −74.006 becomes the minimum and maximum latitude and longitude of a box that fully encloses the circle, ready for a quick range…
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🧭 Travel & geographyFree
Cross-track distance calculator
A fix at 53.2611, −0.7972 sits 307.5495704195 m to the right of the great-circle track between two waypoints.
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🧭 Travel & geographyFree
Decimal degrees to DMS converter
A latitude of 40.7128 becomes 40° 42′ 46.08″ N: pick latitude or longitude, and the converter splits the number into degrees, minutes and seconds, takes the…
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🧭 Travel & geographyFree
Length of a degree of latitude
At 45° of latitude, one degree from south to north covers about 111 km, close to 60 nautical miles.
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🧭 Travel & geographyFree
Length of a degree of longitude
At the equator one degree of longitude spans about 111.32 km, and the same step shrinks toward the poles until it reaches zero.
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🧭 Travel & geographyFree
Destination point calculator
Leave 51.4778° N, 0.0015° W on a bearing of 45° for 10000 m and you arrive at 51.5413472357° N, 0.100745643529° E.
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🧭 Travel & geographyFree
DMS to decimal degrees converter
40° 26′ 46.8″ N becomes 40.446333333333: degrees plus minutes over 60 plus seconds over 3600, with the sign taken only from the hemisphere letter, so south and…
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🧭 Travel & geographyFree
Equirectangular distance
From 40.7128, -74.006 to 40.758, -73.9855 the equirectangular shortcut gives 5314.523521 m, or 5.314524 km.
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🧭 Travel & geographyFree
Great-circle interpolation
Halfway along the great circle from 40.7128, -74.006 to 51.5074, -0.1278 lies 52.3684395875, -41.2903073562, further north than either end.
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🧭 Travel & geographyFree
Geohash bounding box
The geohash 9q8yy decodes to a cell from 37.749023438 to 37.79296875 latitude and -122.431640625 to -122.387695312 longitude, centred on 37.770996094…
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🧭 Travel & geographyFree
Geohash neighbors finder
Enter one geohash and get the eight cells around it, from north round to northwest: u4pruyd has u4pruyf to its north and u4pruye to its east, all with the same…
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🧭 Travel & geographyFree
Web map scale calculator
Turn a web map's zoom level, latitude and screen DPI into its 1:N scale: zoom 10 at latitude 40.7128 on a 96 DPI screen gives 1:437960, the figure for a scale…
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🧭 Travel & geographyFree
Web Mercator meters per pixel
Find how many metres of ground one pixel covers on a Web Mercator map: at zoom 12 on the equator it is 38.2185141426 m, halving with each zoom step and…
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🧭 Travel & geographyFree
Lat lon to MGRS
Enter 38.8895, -77.0353 and get the MGRS reference 18SUJ2347806483, ready for a topographic map, a land-navigation drill or a radio brief.
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MGRS to lat/lon
Paste 18SUJ2348306479 and get 38.88946279, -77.0352420237: the south-west corner of that 1 m square in WGS84 degrees, together with its UTM zone, band and…
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🧭 Travel & geographyFree
Point in polygon checker
The point (1, 1) lies inside the rectangle with corners (0, 0), (4, 0), (4, 3) and (0, 3): a ray cast to the right crosses its outline once, and an odd count…
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🧭 Travel & geographyFree
Polygon centroid calculator
For a ring with corners at latitude 0 to 3 and longitude 0 to 4, the area-weighted centre is 1.5, 2: the balance point of the whole shape, not simply the mean…
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🧭 Travel & geographyFree
Bing Maps quadkey decoder
Turn a Bing Maps quadkey back into the tile it names: 213 is column 3, row 5 at zoom 3, ready to use as the path 3/3/5.
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🧭 Travel & geographyFree
Tile to Bing Maps quadkey
Get the Bing Maps quadkey for any tile: column 3, row 5 at zoom 3 gives 213, the same digits that real tile addresses and cache keys use.
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🧭 Travel & geographyFree
Rhumb line bearing calculator
Get the one compass course to hold between two points along a rhumb line: from 51.127, 1.338 to 50.964, 1.853 it is 116.72186°, or ESE.
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Rhumb line destination point
Find the arrival point when you hold one compass course: 10 km at 45° from 51.4778, -0.0015 ends at 51.5413916406, 0.100674380088.
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Lat/lon to map tile
Find which web map tile contains a point: 51.5074, -0.1278 at zoom 12 falls in tile 12/2046/1362, column 2046 and row 1362.
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🧭 Travel & geographyFree
Lat lon to UTM converter
Latitude 40.7128 and longitude -74.006, in New York, become zone 18N with easting 583959.372 m and northing 4507350.998 m, EPSG 32618.
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Vincenty distance calculator
From 50.06638889, -5.71472222 to 58.64388889, -3.07 the ellipsoidal distance is 969.9329875586 km, leaving on a bearing of 9.1423286009°.
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Web Mercator unproject
X 0 and Y 0 metres on the Web Mercator plane come back as latitude 0° and longitude 0°, where the equator meets Greenwich.
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➗ MathFree
Arc length calculator
With a radius of 10 and a 90° central angle, the arc measures 5π and the sector covers 25π square units, exactly a quarter of the circle.
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Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
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Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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