Frequently asked questions

Yes. Every tool is currently free, and you don't need an account to use them.

No, it's optional. You can use most tools right away without signing in. An account is only needed if you want to save your processing history or use personalization features in the future.

For browser-based tools (most tools today), your file is never sent to a server — it stays fully private. For tools that need server-side processing, temporary files are automatically deleted once processing is done.

No. Open Tools never sells or shares the content of files or data you process with any third party. See the Privacy Policy page for details.

New tools are added regularly. Try the search box on the homepage with a relevant keyword (e.g. "image", "JSON", "PDF"), or browse by category or popular keyword in the footer.

Each tool has its own limits and assumptions (supported formats, max file size...). Check the instructions/description on the tool's page, or read the detailed usage guides in the Documents section.

Yes, the interface is responsive and most tools work well on mobile, though heavy image/file processing may run slower than on a desktop.

Some tools (image compression, watermarking, duplicate removal...) support batch processing. This capability is noted directly on each tool's page.

Yes, each tool has its own limit depending on how it processes files (in-browser vs. server-side). The specific limit is shown right on the tool's page when you upload a file.

Tools that run entirely in your browser depend on your device's resources — larger files take more processing power. If you regularly work with large files, using a desktop is recommended over mobile.

Yes, as long as you comply with the terms of use and any applicable regulations for the data you process. For sensitive data, prefer browser-based tools that never send files to a server.

The interface currently supports Vietnamese and English. You can switch languages from the navigation bar.

Please reach out via the contact details in the footer (email/phone/Zalo). We welcome feedback to keep improving the product.

Not yet — a public API is one of the features being considered for future development.

Yes, tool suggestions are welcome through the footer contact channels. New tools are prioritized based on real user demand.