ForHosting KIT
Everything you need.
One Kit.
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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7554ready-made tools
6channels
1API & key
$0.002per call, from
The full catalog
Search or filter by category. Every capability is its own endpoint with a published price.
🖼️ ImagesFree
App icon size set generator for iOS, Android and web
R
POST /image/icon-set-sizes$0.002🖼️ ImagesFree
Invert image colors
calculate complementary RGB values
F
POST /image/invert-colors$0.002🖼️ ImagesFree
Fit an image with letterbox bars
size and padding calculator
F
POST /image/letterbox-fit$0.002🖼️ ImagesFree
Meme text layout generator
fit top and bottom captions
G
POST /image/meme-text-layout$0.002🖼️ ImagesFree
Check image copyright metadata and creator fields
F
POST /image/metadata-copyright-embed-check$0.002🖼️ ImagesFree
Passport photo sheet layout calculator
F
POST /image/passport-photo-layout$0.002🖼️ ImagesFree
Pixelate image calculator
find block grid dimensions
F
POST /image/pixelate$0.002🖼️ ImagesFree
Megapixel print size calculator
estimate dimensions from DPI
F
POST /image/print-size-from-megapixels$0.002🖼️ ImagesFree
RAW photo file size calculator
estimate uncompressed camera RAW size
K
POST /image/raw-file-estimate-size$0.002🖼️ ImagesFree
Resize image to dimensions
calculate width and height
F
POST /image/resize-to-dimensions$0.002🖼️ ImagesFree
Resize image to target file size
estimate quality and scale
F
POST /image/resize-to-filesize$0.002🖼️ ImagesFree
Calculate responsive image sizes for CSS breakpoints
K
POST /image/responsive-breakpoint-sizes$0.002🖼️ ImagesFree
Rotate image by degrees
calculate bounding box size
F
POST /image/rotate-degrees$0.002🖼️ ImagesFree
Round image corners
validate radius and describe the mask
F
POST /image/round-corners$0.002🖼️ ImagesFree
Apply a sepia filter to image RGB pixel samples
F
POST /image/sepia-convert$0.002🖼️ ImagesFree
Image sharpen kernel calculator
estimate a 3x3 unsharp mask
F
POST /image/sharpen-estimate$0.002🖼️ ImagesFree
Resize image for social platform
calculate the right crop
F
POST /image/social-preset-resize$0.002🖼️ ImagesFree
Generate thumbnail sizes
preserve image aspect ratio
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POST /image/thumbnail-set$0.002🖼️ ImagesFree
Estimate TIFF compression savings for LZW, ZIP, or none
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POST /image/tiff-compression-estimate$0.002🖼️ ImagesFree
Vignette effect calculator
estimate corner darkening
F
POST /image/vignette-estimate$0.002🖼️ ImagesFree
Add image watermark
calculate position, scale and bounding box
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POST /image/watermark-image$0.002🖼️ ImagesFree
Build a repeating tiled watermark layout at any angle
M
POST /image/watermark-tile-repeat-layout$0.002⚙️ Developer UtilitiesFree
Basic will planning checklist by family situation
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POST /legal2/will-basic-checklist$0.002⚙️ Developer UtilitiesFree
a+bi form converter
rectangular and polar form of a complex number
A
POST /math/a-bi-form$0.002⚙️ Developer UtilitiesFree
AAS triangle calculator
two angles and a non-included side
A
POST /math/aas-triangle$0.002⚙️ Developer UtilitiesFree
ABC triangle solver
sides and angles from any combination
A
POST /math/abc-triangle$0.002⚙️ Developer UtilitiesFree
Absolute change calculator
non-negative difference between two numbers
A
POST /math/absolute-change$0.002⚙️ Developer UtilitiesFree
Absolute value equation solver
solve |ax+b|=c for x
A
POST /math/absolute-value-equation$0.002⚙️ Developer UtilitiesFree
Absolute value inequality solver
solve |ax+b| < c and get the interval
A
POST /math/absolute-value-inequalities$0.002⚙️ Developer UtilitiesFree
Acute triangle calculator
check three sides, free
A
POST /math/acute-triangle$0.002⚙️ Developer UtilitiesFree
Add or subtract polynomials
coefficient arrays in, result out
A
POST /math/add-subtract-polynomials$0.002⚙️ Developer UtilitiesFree
Adding and subtracting fractions
simplified result, free in your browser
A
POST /math/adding-and-subtracting-fractions$0.002⚙️ Developer UtilitiesFree
Adding fractions
simplified sum of two fractions, free in your browser
A
POST /math/adding-fractions$0.002⚙️ Developer UtilitiesFree
Addition calculator
sum two or more numbers, free online
A
POST /math/addition$0.002⚙️ Developer UtilitiesFree
Adjoint matrix calculator
adjugate adj(A) from cofactors, free
A
POST /math/adjoint-matrix$0.002⚙️ Developer UtilitiesFree
Logical AND calculator
conjunction of two booleans, free
A
POST /math/and$0.002⚙️ Developer UtilitiesFree
Angle of a right triangle from two sides, in degrees
A
POST /math/angle-of-right-triangle$0.002⚙️ Developer UtilitiesFree
Antilog calculator
antilogarithm of a value for any positive base, free
A
POST /math/antilog$0.002⚙️ Developer UtilitiesFree
Arccos calculator
inverse cosine in radians and degrees
A
POST /math/arccos$0.002⚙️ Developer UtilitiesFree
Arcsin calculator
inverse sine in radians and degrees
A
POST /math/arcsin$0.002⚙️ Developer UtilitiesFree
Arctangent calculator
atan(x) in radians
A
POST /math/arctan$0.002⚙️ Developer UtilitiesFree
Arcus tangent calculator
inverse tangent in radians and degrees
A
POST /math/arcus-tangent$0.002⚙️ Developer UtilitiesFree
Area calculator
square, rectangle, triangle and circle
A
POST /math/area$0.002⚙️ Developer UtilitiesFree
Oblique triangle area calculator
area from two sides and included angle
A
POST /math/area-oblique-triangle$0.002⚙️ Developer UtilitiesFree
Obtuse triangle area calculator
from base and height or three sides
A
POST /math/area-obtuse-triangle$0.002⚙️ Developer UtilitiesFree
Area of a circle calculator
π·r² from the radius, free online
A
POST /math/area-of-a-circle$0.002⚙️ Developer UtilitiesFree
Area of a trapezoid calculator
(a+b)/2·h from bases and height, free
A
POST /math/area-of-a-trapezoid$0.002⚙️ Developer UtilitiesFree
Look up paper size dimensions in mm and inches
M
POST /misc2/paper-size-lookup$0.002⚙️ Developer UtilitiesFree
Convert shoe size between US, UK, and EU regions
R
POST /misc2/shoe-size-convert$0.002⚙️ Developer UtilitiesFree
Child allowance calculator by age
suggested weekly amount
B
POST /parent/allowance-calculate-by-age$0.002📄 Documents & PDFFree
PDF booklet imposition calculator for saddle-stitch printing
B
POST /pdf/booklet-layout$0.002📄 Documents & PDFFree
Add a PDF bookmark
validate its page and outline position
B
POST /pdf/bookmarks-add$0.002📄 Documents & PDFFree
List PDF bookmarks
flatten an outline with pages and levels
B
POST /pdf/bookmarks-list$0.002📄 Documents & PDFFree
Compare two PDFs by text
find changed pages
F
POST /pdf/compare-text$0.002📄 Documents & PDFFree
Crop PDF pages
calculate new page dimensions
F
POST /pdf/crop-pages$0.002📄 Documents & PDFFree
Estimate PDF font subsetting savings from glyph usage
R
POST /pdf/embed-font-subset-estimate$0.002📄 Documents & PDFFree
Parse a PDF page range string into page numbers
K
POST /pdf/export-range-string-parse$0.002📄 Documents & PDFFree
List images in a PDF
page, index, width and height
F
POST /pdf/extract-images-list$0.002📄 Documents & PDFFree
Extract text from PDF pages
join page text in order
F
POST /pdf/extract-text$0.002📄 Documents & PDFFree
Validate PDF form fields and required values
B
POST /pdf/fill-form-fields$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
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
Free tools
$0.00
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.