Frequently Asked Questions

PDFFlow is a free online platform that provides a comprehensive set of PDF processing tools. You can merge, compress, split, rotate, watermark, convert, protect, and unlock PDF files directly in your web browser without installing any software or creating an account.

Yes, PDFFlow is completely free to use. There are no hidden charges, premium tiers, or subscription fees. All tools are available to all users without limitations. We sustain the service through non-intrusive advertising.

No, PDFFlow does not require any registration, login, or account creation. You can start using any tool immediately by visiting the website. We do not collect personal information or require email addresses.

Absolutely. PDFFlow processes all files directly in your web browser using client-side JavaScript. Your PDF files are never uploaded to our servers or any third-party servers. The files remain on your device throughout the entire process, ensuring complete privacy and security.

Since all processing occurs locally in your browser, there is nothing to delete from our end. Your files exist only on your device and in your browser memory during processing. Once you close the tab or navigate away, the browser releases this memory. We never have access to your files.

There is no hard file size limit imposed by PDFFlow. However, since processing happens in your browser, very large files (typically over 200MB) may take longer to process or may be limited by your device available memory. For best performance, we recommend files under 100MB each.

PDFFlow works in all modern web browsers including Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, Opera, and Brave. We recommend keeping your browser updated to the latest version for the best experience. The tools also work on mobile browsers on smartphones and tablets.

PDFFlow can merge PDFs with owner-level restrictions such as printing or editing locks. However, PDFs that require a password to open (user-level encryption) must first be unlocked using our Unlock PDF tool. You will need to know the password to unlock such files.

No. PDFFlow copies pages exactly as they exist in the source documents. There is no re-encoding, recompression, or modification of page content. Text, images, vector graphics, links, and all other elements are preserved at their original quality.

Compression results vary depending on the PDF content. Documents with unoptimized structures, redundant objects, or large embedded resources can see reductions of 20 to 80 percent. Already optimized PDFs will see smaller reductions. The compressor uses structural optimization that does not reduce image quality.

Yes. All PDFFlow tools are fully responsive and work on smartphones and tablets. You can upload, process, and download PDFs on mobile devices using any modern mobile browser. The interface adapts automatically to smaller screens.

PDFFlow requires an internet connection to load the website and tools. However, once the page is loaded, the actual file processing happens locally in your browser. Future versions may include offline support through Progressive Web App technology.

PDFFlow is supported by non-intrusive advertising displayed on the website. We believe that essential document tools should be accessible to everyone regardless of their ability to pay, so we choose to offer all tools for free and sustain the service through ads.

Yes. PDFFlow can be used for personal, educational, and commercial purposes without restriction. Many businesses use PDFFlow as part of their daily document management workflow.

PDFFlow currently offers eight core tools: Merge PDF for combining multiple documents, Compress PDF for reducing file size, Split PDF for extracting specific pages, PDF to JPG for converting pages to images, Add Watermark for document protection, Rotate PDF for fixing page orientation, Unlock PDF for removing restrictions, and Protect PDF for adding password security.

We welcome feedback from our users. Please visit our Contact page to send us a message about any bugs you encounter or features you would like to see added. We review all feedback and use it to improve the service.