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.
Verify an email list from a CSV API — Clean an email list before you send: POST up to 50 addresses, get syntax, MX, disposable and role checks with a 0–100 score for each, in request order. 100 free checks a day, no key.

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.

Barcode generator API: Code 128, EAN-13 and UPC-A as SVG — Generate Code 128, EAN-13 and UPC-A barcodes as sharp SVG with one GET request. Check digits computed or verified, optional human-readable text.
EAN-13 and UPC-A barcode API with check digit — Render EAN-13 and UPC-A retail barcodes as SVG. Send 12 or 11 digits and the check digit is computed; send 13 or 12 and it is verified.

Markdown to PDF API — Convert Markdown to a clean, paginated PDF with one POST: headings, lists, bold, italic, code blocks and links. Letter or A4.

CSV to JSON API (RFC 4180) — Convert CSV to JSON with quoting done right: commas, quotes and line breaks inside fields, BOMs, CRLF. Objects keyed by the header, or arrays.
JSON to CSV API — Turn a JSON array of objects into a spreadsheet-ready CSV with correct quoting. Columns are the union of keys in first-seen order.
JSON to Excel (XLSX) API — Turn a JSON array into a real .xlsx workbook: numbers as numbers, a bold frozen header, one sheet per list. No Excel, no library, one POST.

iCalendar (.ics) file API: bookings to calendar events — Generate a standards-correct .ics file from JSON: times in UTC from your offsets or in a named time zone, all-day events, reminders, repeats that keep their local time across daylight saving changes, organizer and attendees. For Google, Apple and Outlook calendars.
"Add to calendar" link API — One GET URL that downloads an .ics event: put it behind an "Add to calendar" button in an email or on a page.

Remove EXIF and GPS metadata from photos API — Strip GPS location, camera serial numbers, timestamps, XMP, IPTC and hidden thumbnails from JPEG and PNG uploads without re-encoding: identical pixels, one POST.

Uptime Monitor — hourly checks of your website, an email when it goes down and when it is back, TLS certificate and domain expiry warnings, and a monthly report. $5/month for one site.
AI Visibility Monitor — what ChatGPT, Gemini and an open model say about your business, every week.