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⚙️ Developer UtilitiesFree
SEDOL check digit
For the body B0YBKJ the check digit is 7, so the full SEDOL is B0YBKJ7. The tool computes that digit for any six-character body or validates a complete code…
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⚙️ Developer UtilitiesFree
Shell argument quoter
hello world becomes 'hello world', a single safe shell argument: spaces, quotes, asterisks and other special signs are wrapped in single quotes so the shell…
A
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⚙️ Developer UtilitiesFree
Monoalphabetic substitution cipher
With the key QWERTYUIOPASDFGHJKLZXCVBNM, Hello World becomes Itssg Vgksr: you supply the whole 26-letter cipher alphabet, every letter keeps one fixed…
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⚙️ Developer UtilitiesFree
Canadian SIN check digit
The base 04645428 gets check digit 6, giving the full SIN 046454286. Enter eight digits to compute the Luhn digit or nine to validate a complete Social…
A
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⚙️ Developer UtilitiesFree
French SIREN Luhn check
The body 732 829 32 gets check digit 0, giving SIREN 732 829 320, while a mistyped 732 829 321 fails.
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⚙️ Developer UtilitiesFree
French SIRET Luhn check
73282932000074 passes: the Luhn check over all fourteen digits holds, and its first nine digits, the SIREN 732829320, pass their own check too, leaving 00074 as…
A
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⚙️ Developer UtilitiesFree
Soundex encoder
Robert and Rupert both become R163: the first letter stays, the next consonant sounds turn into three digits, and short codes are padded with zeros, so names…
A
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⚙️ Developer UtilitiesFree
Spanish spelling alphabet
SOS becomes Sábado Oviedo Sábado: every letter, Ñ included, and every digit gets its Spanish code word, from Antonio for A to Zaragoza for Z, so names and…
A
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⚙️ Developer UtilitiesFree
SSCC-18 check digit calculator
The 17 data digits 00614141123456789 get check digit 0, so the full SSCC-18 is 006141411234567890.
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⚙️ Developer UtilitiesFree
Germany tax ID check digit
Enter the first ten digits of a German Steuer-ID, such as 8609574271, and get its check digit, 9, plus the full number 86095742719.
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⚙️ Developer UtilitiesFree
Unicode strikethrough text
Type Hello and get H̶e̶l̶l̶o̶: a long stroke mark is placed after each of its 5 letters, so the crossed-out look travels as plain text into chats, bios and…
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⚙️ Developer UtilitiesFree
Unicode subscript text
Type H2O C6H12O6 x1 and get H₂O C₆H₁₂O₆ ₓ₁: digits, plus, minus, equals, brackets and the lowercase letters Unicode supports drop below the line, ready to paste…
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⚙️ Developer UtilitiesFree
Unicode superscript text
Type x2 + y3 and get ˣ² ⁺ ʸ³: digits, plus, minus, equals, brackets and many Latin letters rise into Unicode superscripts that keep their raised look wherever…
A
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⚙️ Developer UtilitiesFree
Swedish spelling alphabet
Type SOS and get Sigurd Olof Sigurd: every letter, including Å, Ä and Ö, becomes its Swedish code name and digits become Noll to Nio, ready to read aloud on a…
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⚙️ Developer UtilitiesFree
System V sum checksum
The word hello gives checksum 532 and 1 block, exactly what sum -s prints on Unix. Paste text to reproduce the classic System V figure, not the BSD…
A
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⚙️ Developer UtilitiesFree
T9 predictive text encoder
Type hello and get 43556, the keys you would press on a classic phone pad where 2 holds ABC and 9 holds WXYZ.
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⚙️ Developer UtilitiesFree
Police ten-code translator
Type 10-4 and read Acknowledgement (OK / message received), or type a phrase such as message received to get the code back.
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⚙️ Developer UtilitiesFree
Ubbi Dubbi translator
Hello world becomes Hubellubo wuborld: the syllable ub goes before every vowel a, e, i, o and u, while y, spaces and punctuation stay as they are.
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⚙️ Developer UtilitiesFree
UIC wagon number check digit
A wagon whose first eleven digits are 21812471217 gets check digit 3, so its full UIC number reads 218124712173.
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⚙️ Developer UtilitiesFree
Unicode escape sequence converter
Type Hi and get \u0048\u0069; an accented é becomes \u00e9 and the emoji U+1F600 becomes the pair \ud83d\ude00.
P
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⚙️ Developer UtilitiesFree
Unicode NFD normalizer
The word café, written with one é, comes out as five code points: c, a, f, e and a combining acute accent.
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⚙️ Developer UtilitiesFree
Unicode NFKC normalizer
file ㎞ ① becomes file km 1: ligatures, fullwidth letters, circled digits and other styled variants fold into plain text, and accents are then recomposed, so…
A
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⚙️ Developer UtilitiesFree
Unicode NFKD normalizer
file ① café becomes file 1 café with the accent split off: ligatures expand into separate letters, circled digits become plain numbers and accented letters break…
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⚙️ Developer UtilitiesFree
UPC-A check digit
The product number 01234567890 gets check digit 5, so the full UPC-A reads 012345678905. Paste a complete twelve-digit code from a partner file or scanner to…
A
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⚙️ Developer UtilitiesFree
UPC-E converter
The UPC-E code 425261 expands to the UPC-A 042100005264: the zeros squeezed out for small packages are put back, manufacturer 42100 and product 00526, and the…
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⚙️ Developer UtilitiesFree
Upside down text flip
Hello World! comes out as ¡plɹoM ollǝH: each letter is swapped for a rotated Unicode look-alike and the order is reversed, so it reads right when the screen is…
A
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⚙️ Developer UtilitiesFree
RFC 3986 percent encoder & decoder
Under strict RFC 3986, hello world!'()* becomes hello%20world%21%27%28%29%2A: only letters, digits, hyphen, period, underscore and tilde stay as they are.
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⚙️ Developer UtilitiesFree
UTF-32 code unit encoder
Turn text into fixed-width UTF-32 values: “Hi” becomes 00000048 00000069, two units and 8 bytes, and an emoji like U+1F600 stays a single unit, 0001F600.
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⚙️ Developer UtilitiesFree
UTF-7 encoder and decoder
Encode text as UTF-7 so it survives seven-bit ASCII channels: café becomes caf+AOk-, and decoding brings back the original word.
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⚙️ Developer UtilitiesFree
Modified UTF-7 IMAP encoder
Get the exact folder name an IMAP server expects: Inbox/日本語 becomes Inbox/&ZeVnLIqe-, and a cryptic token from a protocol log decodes back into its readable…
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⚙️ Developer UtilitiesFree
UK UTR check digit
Compute or check the leading digit of a UK Unique Taxpayer Reference: the body 123456789 gives check digit 1, so the full UTR is 1123456789.
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⚙️ Developer UtilitiesFree
Uuencode encoder & decoder
Turns “Hello, world!” into a classic uuencode document headed begin 644 data.txt, and reads such documents back into text.
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⚙️ Developer UtilitiesFree
VIC cipher
Encrypts ATTACK AT DAWN with the board key COMPUTERS, null digits 37 and the keys ORANGE and BLUE into 61363 17174 31939 70373 3916, and decrypts it back.
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⚙️ Developer UtilitiesFree
Western Union phonetic alphabet
Spells SOS as Sugar Ocean Sugar using the classic Western Union telegraph table, from Adams for A to Zero for Z, and turns a string of code words back into…
A
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⚙️ Developer UtilitiesFree
XML entity encoder
Escapes the five characters XML reserves, so “Tom & Jerry <3” becomes “Tom & Jerry <3”, and turns &, <, >, ' and " back into plain…
A
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⚙️ Developer UtilitiesFree
xxencode encoder
Packs “Hello, world!” into a classic xxencode block, begin 644 hello.txt and all, using only plus, minus, digits and letters so no EBCDIC gateway can mangle it…
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⚙️ Developer UtilitiesFree
yEnc encoder and decoder
Encodes “Hello Usenet” into a framed yEnc fragment, with a =ybegin header and a =yend line carrying the checksum 38A1E859, and decodes such fragments back to…
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⚙️ Developer UtilitiesFree
Zero-width character encoder
Hides a secret inside ordinary text with invisible Unicode characters: “Hi” tucked into “Hello world” becomes 18 zero-width characters nobody sees, and decoding…
P
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➗ MathFree
Angle between two lines calculator
Enter two slopes and get the acute angle between the lines: slopes 1 and 0 meet at 45°, while 2 and −1/2 are perpendicular at 90°.
A
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➗ MathFree
Annulus sector area calculator
A 90° slice of a ring with outer radius 10 and inner radius 4 covers 65.973445725386 square units, a quarter of the full ring.
S
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➗ MathFree
Annulus width from area calculator
A ring with an area of 3π and an inner radius of 1 has an outer radius of 2, so its width is 1. Start from a measured or budgeted area and get the outer edge…
A
Runs in your browser
➗ MathFree
N-antiprism calculator
A square antiprism with every edge 1 has a volume of about 0.957 and a surface area of about 5.464 square units.
S
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➗ MathFree
Astroid area and perimeter calculator
Enter the distance a from the centre to any cusp and get the astroid's exact area, (3/8)πa², and its perimeter, 6a: a radius of 1 gives a perimeter of 6 and an…
A
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➗ MathFree
N-gonal bipyramid calculator
Enter how many sides the middle polygon has, its edge and the height of one tip, and get the bipyramid's volume and surface: a square one with edge 2 and height…
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➗ MathFree
Bretschneider formula calculator
Get the area of any four-sided shape from its four sides and a pair of opposite angles: four sides of 2 with right opposite angles give an area of 4.
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➗ MathFree
Chebyshev distance calculator
Measure the chessboard distance between two points, the larger of the horizontal and vertical gaps: from (0, 0) to (3, 4) it is 4, not the 5 a ruler would show.
S
Runs in your browser
➗ MathFree
Circle area from radius calculator
Type a radius and get the circle's area, πr², together with its diameter and circumference: double the radius and the area grows four times.
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➗ MathFree
Circle circumference calculator
Enter a radius and get the distance around the circle, 2πr: a radius of 5 gives 10π, about 31.4159, and a unit circle gives 2π.
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➗ MathFree
Circle around a square calculator
Get the radius of the circle that passes through all four corners of a square: it is the side times √2/2, so a side of 1 gives about 0.7071.
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Runs in your browser
➗ MathFree
Circle diameter from circumference calculator
Measure the distance around a circle and get how wide it is: the diameter is the circumference divided by π, so a circumference of 2π gives a diameter of 2.
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➗ MathFree
Circle from center and point
Give the center and one point on the circle and get its radius and equation: a center at the origin and the point (3, 4) give a radius of 5 and x² + y² = 25.
A
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➗ MathFree
Circle radius from area calculator
Enter the area of a circle and get its radius, the square root of the area divided by π: an area of π gives a radius of 1 and a diameter of 2.
A
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➗ MathFree
Triangle circumcircle area
Enter a triangle's three sides and get the area of the circle that passes through its corners: sides 3, 4 and 5 give a circumradius of 2.5 and a circle area of…
S
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➗ MathFree
Collinear points checker
Check whether three points lie on one straight line: (0, 0), (1, 1) and (2, 2) do, because the triangle they form has zero area.
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➗ MathFree
Cone apex angle calculator
Get the full opening angle of a cone, twice arctan(r/h), from its base radius and its height; radius 3 and height 4 give about 73.7397952917°.
S
Runs in your browser
➗ MathFree
Cone lateral surface area
Get the area of a cone's sloping side from its base radius and slant height with π r l: a radius of 3 and a slant height of 5 give exactly 15π.
A
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➗ MathFree
Cone slant height calculator
Find the slant height of a cone, the straight edge from the base rim up to the tip, from its radius and height; radius 3 and height 4 give exactly 5.
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Runs in your browser
➗ MathFree
Conic eccentricity calculator
Find how stretched a conic is: an ellipse with semi-axes 5 and 4 has an eccentricity of 0.6 and its focus 3 from the center.
A
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➗ MathFree
Coplanarity checker
Check whether four points in space lie on one flat plane: (0, 0, 0), (1, 0, 0), (0, 1, 0) and (1, 1, 0) do, while lifting the last one to (1, 1, 1) makes a…
A
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➗ MathFree
Sphere circumscribed about a cube calculator
Find the smallest sphere that encloses a cube, passing through all eight corners: its radius is the edge times √3/2, so an edge of 1 gives about 0.866.
S
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2
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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