Production-ready APIs for email validation, image CDN, PDF OCR, QR generation, format conversion and more. Start free, scale with confidence.
# Convert HTML to PDF
curl -X POST https://api.corenexis.com/html-to-pdf/v1 \
-H "X-API-Key: your_api_key" \
-H "Content-Type: application/json" \
-d '{"html": "<h1>Invoice</h1>", "page_size": "a4"}'{
"success": true,
"plan": "pro",
"data": {
"format": "pdf",
"pages": 1,
"size_bytes": 45589,
"page_size": "a4",
"render_time_ms": 305,
"url": "https://cdn.corenexis.com/f/qLm6VWHVlur.pdf",
"expires_at": "2026-08-16T06:24:41+00:00"
}
}From email verification to PDF OCR and image hosting, explore our growing suite of production-ready APIs. Every API includes a free tier.
Turn Markdown into a clean, print-ready PDF or page images. Tables, task lists and syntax highlighted code all render correctly, with thirteen typefaces, a full colour palette and complete control over page size, orientation and margins. Documents of a thousand pages and more are handled, and every result comes back as a hosted link.
Render HTML and CSS exactly as a browser does and take it away as a PDF or as page images. Grid, flexbox, gradients and web fonts all work, with optional JavaScript execution and full control over page size, margins and scale. A long document comes back as an ordered sequence of images rather than one that stops partway down.
Convert any image into clean text and markdown using advanced OCR. Send a photo, screenshot, scan, bill or signage and get the text back instantly, with automatic language detection across 30+ languages.
Convert any PDF into clean text and markdown using advanced OCR. Supports scanned PDFs, images, tables and complex layouts with high accuracy across 30+ languages.
Real-time email verification with DNS checks, disposable detection, MX records and quality scoring to keep your lists clean.
Upload, store and deliver images via a global CDN with flexible storage durations and social sharing built in.
Generate QR codes, UPI payment QRs and barcodes with logo embedding. Supports Code128, EAN-13 and UPC-A.
Auto-detect and convert images across 25+ formats, any format to any format. Modern codecs including AVIF, HEIC and JPEG XL, correct colour handling for CMYK and transparency, and animations that stay animated.
Detect disposable, temporary and fake email addresses in real time. Block spam signups and protect your platform with a fast, accurate and lightweight API.
No API matches that search. Tell us what you need.
Higher limits, dedicated infrastructure or a tailored solution for your team? We will build a plan that fits your exact needs.
Authenticate with a single header and start making requests. Pick your language and copy the snippet.
Sign up and generate an API key from the dashboard in seconds.
Pass your key as the X-API-Key header on every request.
Every endpoint returns clean, predictable JSON with clear status codes.
# Validate an email address
curl -X POST https://api.corenexis.com/email-validator/v1 \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "[email protected]"}'const res = await fetch('https://api.corenexis.com/email-validator/v1', {
method: 'POST',
headers: {
'X-API-Key': 'YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({ email: '[email protected]' })
});
const { success, data } = await res.json();
if (success) console.log(data.status, data.confidence);import requests
res = requests.post(
"https://api.corenexis.com/email-validator/v1",
headers={"X-API-Key": "YOUR_API_KEY"},
json={"email": "[email protected]"},
)
body = res.json()
if body["success"]:
print(body["data"]["status"], body["data"]["confidence"])<?php
$ch = curl_init('https://api.corenexis.com/email-validator/v1');
curl_setopt_array($ch, [
CURLOPT_RETURNTRANSFER => true,
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => [
'X-API-Key: YOUR_API_KEY',
'Content-Type: application/json',
],
CURLOPT_POSTFIELDS => json_encode(['email' => '[email protected]']),
]);
$body = json_decode(curl_exec($ch), true);
echo $body['data']['status'];Drop CoreNexis APIs into the workflows your product already needs.
Validate emails at signup to block fake and disposable accounts before they enter your funnel.
Host product images on a global CDN and convert uploads to optimized WebP or AVIF on the fly.
Generate UPI payment QRs and standard barcodes for checkout, invoices and point of sale.
Turn scanned PDFs into searchable text and markdown for automation and data pipelines.
Clean mailing lists in bulk, improve deliverability and protect your sender reputation.
Detect temporary mail domains in real time to stop spam, abuse and fake registrations.
Built with simplicity, performance and great documentation at the core.
Comprehensive guides with code examples in multiple languages.
Distributed edge architecture with low latency and high availability.
TLS encryption, token auth and regular security audits.
Backward compatible, so your integrations will not break.
Every request reviewed for secure and ethical usage.
Resilient infrastructure running smoothly 24/7.
Copy-paste-ready snippets and intuitive endpoints.
Dedicated support channels on paid plans.
Language-agnostic APIs that integrate with any platform supporting HTTP.
One server address turns all 9+ CoreNexis APIs into tools Claude, n8n or any agent can call — using the same API key you already have.
No package, no separate process. Paste one address into your client and the tools appear.
Same key, same plans, same quotas. A tool call is one REST call, billed exactly as it is today.
“Turn this Markdown into a PDF”, “read the text out of this image”, “check these email addresses”.
markdown_to_pdfhtml_to_pdfimage_to_textpdf_to_textemail_validateimage_convertimage_cdn_uploadqr_barcode_generate +6 more {
"mcpServers": {
"corenexis": {
"type": "http",
"url": "https://api.corenexis.com/mcp/server",
"headers": {
"x-api-key": "YOUR_API_KEY"
}
}
}
}Operational · Streamable HTTP · works with Claude, n8n and any MCP client
Start with the free tier to explore, then scale as you grow. Flexible pricing, so you only pay for what you use.
Quick answers to common questions about our APIs.
Our APIs are language-agnostic and work with any language that supports HTTP requests. We provide code examples in JavaScript, Python, PHP, Ruby, cURL and more.
Yes, each plan has its own rate limit. Free plans have lower limits while paid plans offer much higher throughput. Check each API's pricing for specifics.
Yes, paid plans include SLAs. Standard plans include 99.9% uptime, while Agency and Enterprise plans offer higher uptime targets with priority support.
Absolutely. Every API has a free tier you can use for testing and development, so you can try real data before committing to a paid plan.
All APIs use standard HTTP status codes and return detailed JSON error messages. Our documentation includes a comprehensive error reference guide.
Dedicated email support is available on paid plans. Free tier users have access to detailed documentation. For API-specific questions, feel free to reach out anytime.