Các công cụ PDF trực tuyến này có thực sự miễn phí không?

Yes. All fourteen tools on Free PDF Suite — merge, split, rotate, compress, unlock, protect, sign, page numbers, watermark, type on PDF and every converter — are completely free with no sign-up, no forced watermarks and no daily limits. The site is supported by advertising.

Tệp PDF của tôi có được tải lên máy chủ không?

No. All processing happens locally inside your web browser using JavaScript and WebAssembly-grade libraries. Your documents are never transmitted over the network, which makes the suite suitable for confidential contracts, invoices and personal records.

Tôi có thể tách PDF hoặc chỉ trích xuất một số trang không?

Yes. Open the Tách PDF tool, type a page range such as 1-3, 5, 8 and choose whether to extract those pages into a new PDF or remove them from the document. The Xoay PDF tool fixes sideways or upside-down scans, and JPG sang PDF combines photos into a single PDF.

Làm thế nào để mở khóa PDF được bảo vệ bằng mật khẩu?

Open the Mở khóa PDF tool, select your file and enter the document password if one is required to open it. The tool decrypts the file locally in your browser and produces an unlocked copy. Only unlock documents that you own or are authorized to modify.

Tôi có thể ký PDF trực tuyến mà không cần Adobe Acrobat không?

Yes. The Ký PDF tool lets you draw your signature with a mouse, trackpad or touchscreen, then click anywhere on the page preview to place it. The signature is embedded directly into the PDF on your device.

Trình nén PDF giảm kích thước tệp bằng cách nào?

The compressor re-renders each page and re-encodes it as an optimized image at your chosen quality level. This typically shrinks scanned or image-heavy PDFs dramatically. Note that the output is image-based, so text is no longer selectable.

Chuyển đổi Word sang PDF và PDF sang Word chính xác đến mức nào?

Word sang PDF preserves headings, paragraphs and lists with clean typography. PDF sang Word extracts the full text content into an editable document. Complex layouts, tables and embedded graphics may be simplified because conversion runs entirely on your device.

Có giới hạn kích thước tệp không?

There is no hard limit imposed by the site. Because processing happens in your browser, the practical limit depends on your device's memory — files up to roughly 100 MB work well on most modern computers.

Hỗ trợ những trình duyệt và thiết bị nào?

Free PDF Suite works in all modern browsers — Chrome, Edge, Firefox and Safari — on Windows, macOS, Linux, Android and iOS. No installation or browser extension is needed.