Frequently Asked Questions

Absolutely. This is the most important feature of StarzstechPDF. All processing happens 100% locally in your web browser. Your files are never uploaded to any server, which means we—or anyone else—can never see them. Your privacy is guaranteed.

Yes, it's completely free, and there's no catch. There are no hidden fees, no subscription plans, no usage limits, and no premium-only features. We believe essential tools should be accessible to everyone.

After you load the website for the first time, most tools will work completely offline! Because all the processing libraries are loaded into your browser, you can disconnect from the internet and continue to merge, split, compress, and edit your PDFs securely. Some niche tools that require external data (like Markdown to PDF with web images) may need a connection.

No, we do not impose any artificial limits on file size, the number of files, or how many times you can use a tool. The only practical limitation is the processing power and memory of your own computer, as very large or complex files may take longer to process.

Failures are rare but can happen for a few reasons:

• The PDF might be corrupted or not compliant with standard specifications.
• The file could be encrypted with a password you don't have. Please use our Decrypt tool first.
• The file might be a special "XFA" or dynamic form-based PDF, which some of our tools cannot process.

We do not use any analytics, cookies, or tracking scripts. StarzstechPDF collects no personal information about you. We have no idea who you are — and that's intentional.

StarzstechPDF is built on the power of modern web technologies. We primarily use JavaScript libraries like PDF-lib and PDF.js that run efficiently in your browser. This allows for powerful, server-like processing without your data ever leaving your machine.