What programming languages are supported?

The APIs are language-agnostic and work with any language that supports HTTP requests, with code examples provided in JavaScript, Python, PHP, Ruby, cURL and more.

Can I test APIs before purchasing?

Yes, every API has a free tier you can use for testing and development to try real data before committing to a paid plan.

Are there rate limits on API calls?

Yes, each plan has its own rate limit. Free plans have lower limits while paid plans offer much higher throughput, with specifics available in each API's pricing details.

Is there a Service Level Agreement (SLA)?

Yes, paid plans include SLAs with Standard plans offering 99.9% uptime, while Agency and Enterprise plans provide higher uptime targets with priority support.

How do I handle API errors?

All APIs use standard HTTP status codes and return detailed JSON error messages, with a comprehensive error reference guide included in the documentation.

APIs & SDKs

Core Nexis

Production-ready APIs for email validation, image CDN, PDF and HTML rendering, OCR, QR codes and image conversion

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Developer-first API platform offering production-ready APIs for document conversion, email validation, OCR, image hosting and QR code generation with free tiers

Overview

A look at api.corenexis.com

Core Nexis is a developer-first API platform providing production-ready APIs across nine services. It offers document conversion (Markdown to PDF, HTML to PDF), OCR capabilities (Image to Text, PDF to Text), email validation with disposable email detection, image hosting via global CDN, QR code and barcode generation, and image format conversion supporting 25+ formats. Every API includes a free tier for testing and development, with paid plans offering higher limits and features. The platform supports multiple programming languages through language-agnostic RESTful APIs and serves over 12,000 developers worldwide.

Feature notes

HTML and CSS rendering for PDF conversion with JavaScript execution
OCR with 30+ language support and auto-detection
Real-time email verification with SMTP and DNS checks
Global CDN with flexible image storage and social sharing
QR code and barcode generation with logo embedding
Image format conversion across 25+ formats including AVIF, HEIC and JPEG XL
Markdown to PDF conversion with syntax highlighting and custom fonts
Language-agnostic RESTful APIs supporting multiple programming languages
SLA with 99.9% uptime on paid plans

Pricing

Pricing model: Freemium

Markdown to PDF: Free (50/mo), $4.99/mo (1,000/mo), $12.99/mo (5,000/mo), $24.99/mo (15,000/mo), Custom; HTML to PDF: Free (30/mo), $6.99/mo (500/mo), $19.99/mo (2,500/mo), $39.99/mo (8,000/mo), Custom; Image to Text OCR: Free (50/mo), $4.99/mo (500/mo), $14.99/mo (2,000/mo), $29.99/mo (5,000/mo), C

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Core Nexis at a glance

Community votes: 0
Followers: 0

Core Nexis metrics

Inspection sheet for api.corenexis.com: Ahrefs Domain Rating and Majestic link metrics, with the delta since the last inspection.
Metric	Value
Domain Rating	37 +2 (up) since last check
Trust Flow	3 no change since last check
Citation Flow	18 no change since last check
Referring domains	11 no change since last check
External backlinks	27 no change since last check

Domain Rating by Ahrefs inspected 7 Nov 2026, adjusted 26 Oct 2026. Primary topic: Computers/Internet/Web Design and Development (3). Majestic inspected 25 Oct 2026, adjusted 25 Oct 2026. Link data: Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

Core Nexis domain diagnostics

Run through the diagnostics

Public RDAP record, last read 6 Nov 2026, 13:19 UTC.
Domain age	3 years
Registered	8 Aug 2023
Expires	8 Aug 2033
Registrar	NameCheap, Inc.
DNSSEC	Signed

Run the full check on corenexis.com

Core Nexis post-launch diagnostics

Measured after Core Nexis went live on Launching Pro on 25 October 2026.

Domain Rating (Ahrefs): 37 +2 (up) since launch; 35 at launch (25 Oct 2026), 37 on 7 Nov 2026
Trust Flow (Majestic): 3; First measured 25 Oct 2026
Referring domains (Majestic): 11; First measured 25 Oct 2026

Day 12 since launch. Next receipt: day 30, 24 Nov 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.

Biggest gains on Launching Pro

Launch tips, free to read

The playbook on Launching Pro lists what to prepare, what to post on launch day and where else to list your product.

Before the day
Launch day
That week
Beyond launch

See the launch playbook

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FAQ

What programming languages are supported?: The APIs are language-agnostic and work with any language that supports HTTP requests, with code examples provided in JavaScript, Python, PHP, Ruby, cURL and more.
Can I test APIs before purchasing?: Yes, every API has a free tier you can use for testing and development to try real data before committing to a paid plan.
Are there rate limits on API calls?: Yes, each plan has its own rate limit. Free plans have lower limits while paid plans offer much higher throughput, with specifics available in each API's pricing details.
Is there a Service Level Agreement (SLA)?: Yes, paid plans include SLAs with Standard plans offering 99.9% uptime, while Agency and Enterprise plans provide higher uptime targets with priority support.
How do I handle API errors?: All APIs use standard HTTP status codes and return detailed JSON error messages, with a comprehensive error reference guide included in the documentation.

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