PDFMint

On most online PDF sites, a tenancy contract or a payslip travels to a stranger's server before two pages get joined. PDFMint does the work inside the browser tab, so the file stays on your phone or computer and is gone when the tab closes. It opens without an account, and the homepage adds that the tools keep working offline and leave no watermark on the result.

The site counts 32 tools. The everyday ones join, split, reorder and compress files, and an editor adds text, stamps, comments and your signature. Converters run in both directions between PDF and Word, Excel, PowerPoint or JPG. Others black out sensitive passages, set or remove a password, compare two versions of a document, or turn phone camera shots into a PDF.

Text recognition for scans and the two AI tools, summary and translation, are the exception. They send the file to a server and carry a "Needs API" label in the tool list. The stated size limit is 100 MB per file and 300 MB in total, depending on the memory of your device. Ads appear on the site, and the interface comes in English, Spanish, French and Portuguese.