Encrypt PDF with a password
Encrypt PDF with a password; processing runs in the uk-pdf WebAssembly module and files stay in the browser.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
PDF (base64)
Encrypt PDF with a password
The output is the base64 of the encrypted PDF.
Loading the PDF module…
Paste the PDF base64 to encrypt it
Pages: 0
What this tool does
- Add an open password to a contract.
- Put a gate on internal documents.
- Encrypt an archived file.
Example
Input
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
Output
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
auto uses AES-256 when an entropy source is available and falls back to RC4-128; both passwords empty is rejected.
Frequently asked questions
Are passwords uploaded?
No. Encryption runs entirely in local WebAssembly.
Are permission flags supported?
Fine-grained permissions (printing, copying) are not offered; full permissions are written.
Can a forgotten password be recovered?
No. This is standard PDF encryption with no backdoor.
Keywords：pdfwasmofflinePDF 加密pdfpass