Our free PDF Password Protector provides a professional, high-performance solution to compress, merge, split, crop, sign, rotate, organize, or edit your PDF documents directly within your browser. Engineered for maximum speed and absolute privacy, the tool operates entirely on the client side using secure local JavaScript processing—meaning your data never leaves your device and is never uploaded to any external server. Whether you are working on a desktop, tablet, or mobile phone, the responsive and premium interface delivers instant real-time results with zero wait times. Designed for daily productivity, it features fully configurable parameters, robust input verification, and offline capability to ensure a seamless, secure workflow.
Drag and drop your PDF into the input panel, or click 'Browse File' to select it from your device. Large PDFs up to 200 MB are supported.
Open the Options panel, enter your desired open password, select the encryption algorithm (AES-256 is recommended), and click 'Encrypt PDF'.
Our client-side engine will encrypt your PDF document instantly in browser memory. Click 'Download' to save the protected file.
Your data is processed entirely inside your browser using client-side JavaScript. Nothing ever travels over a network to any server — making BunchTool the most private option available.
Because everything runs locally in your browser, there are no upload queues or server wait times. Results appear in seconds regardless of your internet speed — or even without any connection at all.
Choose between military-grade AES-256 encryption or legacy RC4-128 encryption. Adjust security layers in browser memory instantly.