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Hundreds of ready-made tasks — PDF, images, audio, OCR, text AI, scraping, data and more — behind a single REST API. Send a job, get a finished result by webhook. No servers, no per-model tokens, a price you can read.
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The full catalog
Search or filter by category. Every capability is its own endpoint with a published price.
⚙️ Developer UtilitiesFree
Unicode NFKC normalizer
fold ligatures and compatibility forms, free
A
POST /enc/unicode-nfkc$0.002⚙️ Developer UtilitiesFree
Unicode NFKD normalizer
compatibility decomposition, free
S
POST /enc/unicode-nfkd$0.002⚙️ Developer UtilitiesFree
UPC-A check digit
compute from 11 digits or validate a 12-digit code
A
POST /enc/upc-check$0.002⚙️ Developer UtilitiesFree
UPC-E converter
expand to UPC-A and compress back free
P
POST /enc/upce$0.002⚙️ Developer UtilitiesFree
Upside down text flip
invert text with Unicode look-alikes
A
POST /enc/upside-down$0.002⚙️ Developer UtilitiesFree
RFC 3986 percent encoder & decoder
unreserved set, free
S
POST /enc/url-rfc3986$0.002⚙️ Developer UtilitiesFree
UTF-32 code unit encoder
text to 32-bit hex or decimal, free
P
POST /enc/utf32$0.002⚙️ Developer UtilitiesFree
UTF-7 encoder and decoder
seven-bit-safe Unicode, free
A
POST /enc/utf7$0.002⚙️ Developer UtilitiesFree
Modified UTF-7 IMAP encoder
encode or decode mailbox names, free
S
POST /enc/utf7-imap$0.002⚙️ Developer UtilitiesFree
UK UTR check digit
compute and validate Unique Taxpayer Reference
A
POST /enc/utr-uk$0.002⚙️ Developer UtilitiesFree
Uuencode encoder & decoder
classic Unix begin/mode rows, free
P
POST /enc/uuencode$0.002⚙️ Developer UtilitiesFree
VIC cipher
straddling checkerboard encrypt/decrypt, free
P
POST /enc/vic-cipher$0.002⚙️ Developer UtilitiesFree
Western Union phonetic alphabet
Adams Boston Chicago, free
A
POST /enc/western-union-phonetic$0.002⚙️ Developer UtilitiesFree
XML entity encoder
escape & < > ' ", free
A
POST /enc/xml-entities$0.002⚙️ Developer UtilitiesFree
xxencode encoder
encode or decode EBCDIC-safe text, free
A
POST /enc/xxencode$0.002⚙️ Developer UtilitiesFree
yEnc encoder and decoder
Usenet binary encode/decode, free
S
POST /enc/yenc$0.002⚙️ Developer UtilitiesFree
Zero-width character encoder
hide & reveal secret text, free
P
POST /enc/zero-width$0.002⚙️ Developer UtilitiesFree
Angle between two lines calculator
acute angle from two slopes
A
POST /geom/angle-between-lines$0.002⚙️ Developer UtilitiesFree
Annulus sector area calculator
two radii and angle, free
S
POST /geom/annulus-sector-area$0.002⚙️ Developer UtilitiesFree
Annulus width from area calculator
outer radius and ring width
A
POST /geom/annulus-width-area$0.002⚙️ Developer UtilitiesFree
N-antiprism calculator
volume and surface area from sides and edge
S
POST /geom/antiprism$0.002⚙️ Developer UtilitiesFree
Astroid area and perimeter calculator
A = (3/8)πa², P = 6a
A
POST /geom/astroid$0.002⚙️ Developer UtilitiesFree
N-gonal bipyramid calculator
volume and surface from n, edge, height
P
POST /geom/bipyramid$0.002⚙️ Developer UtilitiesFree
Bretschneider formula calculator
area from sides and opposite angles
S
POST /geom/bretschneider-area$0.002⚙️ Developer UtilitiesFree
Chebyshev distance calculator
chessboard L∞ distance between two points
S
POST /geom/chebyshev-distance$0.002⚙️ Developer UtilitiesFree
Circle area from radius calculator
A = πr² free online
P
POST /geom/circle-area-radius$0.002⚙️ Developer UtilitiesFree
Circle circumference calculator
C = 2πr from radius
A
POST /geom/circle-circumference$0.002⚙️ Developer UtilitiesFree
Circle around a square calculator
enclosing radius from side
S
POST /geom/circle-circumscribed-square$0.002⚙️ Developer UtilitiesFree
Circle diameter from circumference calculator
d = C/π free online
P
POST /geom/circle-diameter-circumference$0.002⚙️ Developer UtilitiesFree
Circle from center and point
radius and standard equation
A
POST /geom/circle-from-center-point$0.002⚙️ Developer UtilitiesFree
Circle radius from area calculator
r = √(A/π), free
A
POST /geom/circle-radius-area$0.002⚙️ Developer UtilitiesFree
Triangle circumcircle area
circumscribed circle from 3 sides
S
POST /geom/circumcircle-area$0.002⚙️ Developer UtilitiesFree
Collinear points checker
are three points on a straight line?
P
POST /geom/collinear-points$0.002⚙️ Developer UtilitiesFree
Cone apex angle calculator
full apex angle from radius and height
S
POST /geom/cone-apex-angle$0.002⚙️ Developer UtilitiesFree
Cone lateral surface area
A = π r l from radius and slant height
A
POST /geom/cone-lateral-area$0.002⚙️ Developer UtilitiesFree
Cone slant height calculator
radius and height to generator length
P
POST /geom/cone-slant-height$0.002⚙️ Developer UtilitiesFree
Conic eccentricity calculator
circle, ellipse, parabola, hyperbola
A
POST /geom/conic-eccentricity$0.002⚙️ Developer UtilitiesFree
Coplanarity checker
test if four 3D points lie on one plane
A
POST /geom/coplanar-points$0.002⚙️ Developer UtilitiesFree
Sphere circumscribed about a cube calculator
radius and volume from edge
S
POST /geom/cube-circumscribed-sphere$0.002⚙️ Developer UtilitiesFree
Cube space diagonal calculator
diagonal from edge length a√3
A
POST /geom/cube-diagonal$0.002⚙️ Developer UtilitiesFree
Cube surface area from volume calculator
S = 6·V^(2/3)
S
POST /geom/cube-surface-volume$0.002⚙️ Developer UtilitiesFree
Cuboid space diagonal calculator
d = √(l²+w²+h²) free
A
POST /geom/cuboid-diagonal$0.002⚙️ Developer UtilitiesFree
Cuboid surface area calculator
total surface from L×W×H free
P
POST /geom/cuboid-surface$0.002⚙️ Developer UtilitiesFree
Brahmagupta formula calculator
cyclic quadrilateral area from four sides
P
POST /geom/cyclic-quadrilateral-area$0.002⚙️ Developer UtilitiesFree
Ptolemy theorem calculator
cyclic quadrilateral diagonals
P
POST /geom/cyclic-quadrilateral-diagonals$0.002⚙️ Developer UtilitiesFree
Cycloid arc length and area calculator
one arch from radius r
A
POST /geom/cycloid$0.002⚙️ Developer UtilitiesFree
Cylinder height from volume calculator
height from volume and base radius
P
POST /geom/cylinder-height-volume$0.002⚙️ Developer UtilitiesFree
Cylinder lateral surface area
A = 2π r h from radius and height
A
POST /geom/cylinder-lateral-area$0.002⚙️ Developer UtilitiesFree
Decagon area calculator
regular 10-gon from side length, free
A
POST /geom/decagon-area$0.002⚙️ Developer UtilitiesFree
Decagon area from apothem
regular decagon area calculator
P
POST /geom/decagon-area-apothem$0.002⚙️ Developer UtilitiesFree
Decagon circumradius calculator
radius from side length
S
POST /geom/decagon-circumradius$0.002⚙️ Developer UtilitiesFree
Decagon perimeter calculator
regular decagon P = 10 × side
A
POST /geom/decagon-perimeter$0.002⚙️ Developer UtilitiesFree
Decagonal prism calculator
volume and surface from side and height
P
POST /geom/decagonal-prism$0.002⚙️ Developer UtilitiesFree
Distance between two points in 3D
Euclidean calculator, free
A
POST /geom/distance-3d$0.002⚙️ Developer UtilitiesFree
Dodecagon area calculator
regular 12-gon from side length, free
A
POST /geom/dodecagon-area$0.002⚙️ Developer UtilitiesFree
Dodecagon area from apothem
regular dodecagon area calculator
P
POST /geom/dodecagon-area-apothem$0.002⚙️ Developer UtilitiesFree
Dodecagon circumradius calculator
regular 12-gon from side length, free
A
POST /geom/dodecagon-circumradius$0.002⚙️ Developer UtilitiesFree
Dodecagon perimeter calculator
regular dodecagon P = 12 × side
A
POST /geom/dodecagon-perimeter$0.002⚙️ Developer UtilitiesFree
Dodecahedron inradius calculator
inscribed sphere radius from edge length
A
POST /geom/dodecahedron-inradius$0.002⚙️ Developer UtilitiesFree
Dodecahedron midradius calculator
midsphere radius from edge length
P
POST /geom/dodecahedron-midradius$0.002No capabilities match your search.
How it works
1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
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Free tools
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
$0.002+
The full API — 7500+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
$10.00+
Top up your balance and spend it across web, API and the app. It never expires.