How We Test Our Tools

Every tool on ImageAndPDF.com is tested with real files before it is published, and re-tested whenever we change it. We do not ship a tool that we have not personally run through the checks below. This page explains what that testing involves.

Browser Testing

Because most of our tools run entirely in the browser, we test each one by actually using it: uploading representative files, running the operation, and confirming the output is correct. For PDFs that means verifying page counts, that text stays selectable, that no blank pages are introduced, and that the file opens cleanly in common readers. For images we check dimensions, format, color, and that quality is preserved.

Performance Testing

We test with small files and with large, multi-page or high-resolution files to make sure a tool stays responsive and finishes in a reasonable time. We watch for memory pressure and tab freezes, and we tune or hide features that cannot perform acceptably on typical consumer hardware.

Privacy Testing

For tools advertised as browser-based, we verify that files are processed on-device and are not transmitted to our servers. Where a tool genuinely requires server-side processing, we say so on the tool page and confirm that uploaded files are deleted after processing.

Cross-Browser Testing

We test across modern browsers — Chrome, Firefox, Safari, and Edge — on both desktop and mobile, because browser differences (especially around WebAssembly, canvas, and file APIs) can change behavior. Known limitations on a specific browser are noted where relevant.

Quality Verification

Before a tool is considered done, we compare its output against the original to confirm nothing was lost or corrupted, check edge cases (empty files, unusual formats, very large inputs), and confirm error and loading states behave correctly. Anything that fails these checks is fixed or held back.

For the standards behind our written content, see our Editorial Policy. Questions about our process? Contact us.