Guides

Short, practical pages: one per job, each with a live request you can run from the page.

Email Verify

Free email verification API with MX check — Verify an email address in one HTTP call: syntax, MX records, disposable domains, role accounts and typo suggestions. 100 free checks a day, no key.
Disposable email detection API — Detect temporary and throwaway email domains (mailinator, guerrillamail, 10minutemail and hundreds more) with a single API call.

Invoice PDF API: JSON in, PDF out — Generate a clean, professional invoice, estimate or receipt PDF from a JSON payload. No templates to design, no headless browser to run.

QR code API: SVG and PNG in one request — Generate QR codes as SVG or PNG with a single GET request. Custom colours, error-correction level, rounded modules, up to 2048px. Cached forever.
Wi-Fi QR code API — Create a scan-to-join Wi-Fi QR code from an SSID and password. Works with the iOS and Android camera apps.
vCard contact QR code API — Turn a name, phone, email and website into a vCard QR code that adds a contact when scanned.

Website technology detection API — Find out what a website is built with: WordPress, Wix, Shopify, Squarespace, Webflow, Next.js and 30 more, plus analytics tags and booking platforms.
Extract emails, phone numbers and social links from a website API — Pull public contact details (emails, phone numbers, Facebook, Instagram, LinkedIn, Yelp) from any web page in one call.

Text summarization API — Summarize any text to a few sentences or bullet points with one POST. Free tier included.
Sentiment analysis API — Classify text as positive, neutral or negative with a score and confidence. Sub-second, free tier included.
Keyword extraction API — Extract the most important terms and phrases from a document, weighted, in one call.
Zero-shot text classification API — Classify text into labels you define at request time. No training, no dataset.
Rewrite text in a different tone API — Rewrite a message as professional, casual, concise, friendly or formal.