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Visual regression testing is a quality assurance technique that compares screenshots of your application over time to detect unintended visual changes. Instead of manually checking every page after each deployment, you can automate the entire process with a screenshot API. In this guide, we will walk through building a visual regression testing pipeline using the ToolCenter Screenshot API. What Is Visual Regression Testing? Visual regression testing captures screenshots of your web pages and compares them pixel-by-pixel against a baseline. When differences are detected, the test flags potential issues for review. ...

Generating invoices manually is a time sink. Whether you are running a SaaS, freelancing, or managing an e-commerce platform, automating invoice generation saves hours every month and eliminates human error. The best approach? Convert HTML templates to PDF using an API. In this guide, you will learn how to automate invoice generation by designing invoices in HTML and CSS, then converting them to pixel-perfect PDFs programmatically. Why HTML to PDF for Invoices? There are many ways to generate PDFs — libraries like ReportLab (Python), jsPDF (JavaScript), or wkhtmltopdf. But HTML-to-PDF has clear advantages: ...

When you paste a URL into Slack, Twitter, or iMessage, a rich preview appears showing the page title, description, and an image. These link previews feel like magic to users, but behind the scenes, someone had to fetch and parse the metadata from that URL. In this tutorial, you will learn how to build beautiful link previews for your own application using a metadata extraction API. We will cover Open Graph tags, Twitter Cards, fallback strategies, and production-ready code examples. ...

Your website just broke and nobody noticed for three hours. A CSS update pushed to production shifted the checkout button off-screen, and conversions dropped to zero. If only you had automated screenshot monitoring in place, you would have caught it in minutes. In this guide, you will learn how to build a website monitoring system using automated screenshots that detects visual changes, layout issues, and downtime — with practical code you can deploy today. ...

Taking a full page screenshot of a website might sound simple, but anyone who has tried it programmatically knows the pain. Lazy-loaded images, infinite scroll, sticky headers, cookie banners — there are dozens of edge cases that make capturing an entire webpage surprisingly complex. In this guide, you will learn how to take full page screenshots programmatically using a screenshot API, with practical code examples you can use in production today. ...