Developer access to practical tools

Connect the tool. Automate the workflow.

Add document generation, QR codes, text processing, calculations and business utilities to your own apps through simple, developer-friendly APIs.

Explore APIs View Developer Tools

This page presents the planned API catalog and access structure. Endpoints should only be marked live after the backend service, authentication and usage tracking are working.

REST APIs JSON responses API keys Webhooks Developer documentation

API Request Console

Example developer request

200 OK

POST /v1/qr-code

{
  "content": "https://turnkeytoolshq.com",
  "format": "png",
  "size": 1024
}

Response Generated successfully

File format PNG

Processing time 184 ms

Request ID req_8f21d9

Authenticate Secure API-key access

Request Send structured JSON

Process Run the selected tool

Return Receive files or data

API catalog

Connect your application to the right service.

Search the catalog or filter APIs by documents, text, media, calculations, business workflows and developer utilities.

Planned

QR Code API

Generate QR codes from URLs, text, contact details, Wi-Fi credentials and custom content.

PNG SVG POST

API documentation coming soon

INV

Planned

Invoice Generation API

Create branded invoice files from customer details, line items, taxes, payment terms and totals.

PDF JSON Business

API documentation coming soon

EST

Planned

Estimate API

Generate customer estimates using labor, materials, quantities, pricing, taxes and project notes.

Estimates PDF Contractors

API documentation coming soon

PDF

Planned

HTML to PDF API

Convert HTML markup or a supported webpage into a downloadable PDF document.

HTML PDF Conversion

API documentation coming soon

IMG

Planned

Image to PDF API

Convert JPG, PNG and supported image files into single-page or multi-page PDF documents.

JPG PNG PDF

API documentation coming soon

MERGE

Planned

PDF Merge API

Combine multiple PDF files into one ordered document through a single request.

PDF Merge Files

API documentation coming soon

CLEAN

Planned

Text Cleanup API

Remove extra spaces, normalize line breaks, repair common formatting issues and return cleaned text.

Text Cleanup JSON

API documentation coming soon

CASE

Planned

Case Converter API

Convert text to uppercase, lowercase, title case, sentence case, camel case, snake case or kebab case.

Formatting Text Developer

API documentation coming soon

SLUG

Planned

Slug Generator API

Convert titles or phrases into clean URL slugs with optional length and separator controls.

SEO URLs Text

API documentation coming soon

COUNT

Planned

Text Statistics API

Return word, character, sentence, paragraph and estimated reading time statistics.

Word count Reading time JSON

API documentation coming soon

JSON

Planned

JSON Formatter API

Validate, format, minify and normalize JSON data with structured error responses.

JSON Validation Formatting

API documentation coming soon

COLOR

Planned

Color Conversion API

Convert colors between HEX, RGB, HSL, HSV and other supported formats.

HEX RGB HSL

API documentation coming soon

UNIT

Planned

Unit Conversion API

Convert length, area, volume, weight, temperature, pressure, speed, time and other measurements.

Conversions Measurements JSON

API documentation coming soon

FIN

Planned

Finance Calculation API

Run loan, payment, markup, margin, break-even and other practical business calculations.

Finance Calculations Business

API documentation coming soon

BUILD

Planned

Construction Calculation API

Estimate common concrete, drywall, paint, flooring, roofing and material quantities.

Construction Materials Contractors

API documentation coming soon

HOME

Planned

Real Estate Analysis API

Calculate mortgage payments, cap rates, cash flow, closing costs and investment returns.

Real estate Rental Investment

API documentation coming soon

MAIL

Planned

Email Template API

Return structured business email templates for sales, billing, scheduling and customer support situations.

Email Templates Business

API documentation coming soon

PROP

Planned

Proposal Generation API

Build structured proposals from client information, scope, deliverables, pricing and project timelines.

Proposals Sales Documents

API documentation coming soon

LEAD

Planned

Lead Scoring API

Score prospects using configurable fit, budget, need, timing and engagement criteria.

Sales Leads Scoring

API documentation coming soon

SEO

Planned

SEO Inspection API

Return page title, meta description, headings, canonical, indexing and basic technical SEO checks.

SEO Website Inspection

API documentation coming soon

CAP

Planned

Webpage Capture API

Capture full-page or viewport screenshots of supported public webpages.

Screenshot PNG Webpage

API documentation coming soon

LOGO

Planned

Website Asset API

Retrieve supported public favicon, logo and basic website asset information.

Favicon Website Assets

API documentation coming soon

HOOK

Planned

Webhook Test API

Send test webhook events and inspect payloads, headers, delivery results and response codes.

Webhooks Testing Developer

API documentation coming soon

RAND

Planned

Random Data API

Generate random numbers, strings, tokens, colors, choices and test-data values.

Random data Testing Tokens

API documentation coming soon

No matching APIs found

Try another keyword, category or availability filter.

Browse by API category

Services organized around what your application needs to do.

Connect document workflows, text processing, media generation, calculations and business operations.

Document APIs

Generate invoices, estimates and PDFs or process uploaded document files.

Browse document APIs → Text APIs

Clean, format, count, convert and organize text content.

Browse text APIs → Calculation APIs

Run unit, financial, construction and property calculations.

Browse calculation APIs → Developer APIs

Validate JSON, test webhooks, inspect pages and generate test data.

Browse developer APIs →

Developer-friendly by design

Build with predictable requests and responses.

A real API launch should include authentication, clear endpoint documentation, usage limits, logs, error codes and versioned responses.

01 Simple authentication

Use secure API keys with account-based access and revocation.

02 Structured JSON

Send predictable request fields and receive consistent response objects.

03 Usage tracking

Display request volume, errors, rate limits and remaining monthly usage.

04 Versioned endpoints

Protect integrations by publishing changes through stable API versions.

Example API access structure

Start small and scale when usage grows.

These plans are placeholders for the future API product. Do not activate paid checkout until the API backend and billing controls are ready.

Developer

Free Testing

$0 /month

A limited plan for testing requests and evaluating an integration.

100 requests per month
Test API key
Basic documentation
Community support

Join API Waitlist

Builder

Production Access

$19 /month

A future plan for small apps, automations and business workflows.

10,000 requests per month
Production API keys
Usage dashboard
Email support

Request Early Access

Business

Higher Volume

Custom

For larger request volumes, teams, private integrations and custom limits.

Custom request volume
Multiple API keys
Priority support
Custom integrations

Contact Turnkey Tools

Bring practical Turnkey Tools features into your own application.

Join the early-access list for API documentation, testing keys and future endpoint announcements.

Request API Access

Common questions

Everything developers should know.

Find answers about API availability, keys, request limits, responses and future production access.

The catalog on this page represents planned API services. Do not advertise an endpoint as live until its backend, documentation, authentication and usage controls have been fully tested.

The recommended structure is an account dashboard that creates revocable API keys. Requests would send the key in a secure authorization header.

Data-based endpoints should return JSON. File-generation endpoints can return a secure temporary file URL, encoded output or a downloadable file response.

Yes. Each plan should have documented monthly quotas and short-term rate limits to protect service reliability and control processing costs.

At minimum, build a working endpoint, account authentication, secure key management, request logging, rate limits, billing, documentation, error handling and a privacy policy that covers submitted data.