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Password Protect PDF

Create a password-protected copy of an unencrypted PDF, locally.

Create a password-protected copy of an unencrypted PDF, locally.

    Options

    One unencrypted PDF up to 50 MiB and 300 pages. Reject damaged documents, signatures and interactive forms; export an unsigned, flattened copy first. The original stays unchanged. Check the output in a PDF viewer. AES-256 opening-password encryption through qpdf. Require matching nonempty passwords, 8–127 UTF-8 bytes; do not trim or normalize passwords. Do not save or recover passwords. No editing/printing restriction guarantee.

    How to use

    Password Protect PDF

    Create a password-protected copy of an unencrypted PDF, locally.

    Step by step

    1. Choose a supported input or load the example, then review the original.
    2. Create a password-protected copy of an unencrypted PDF, locally. Start with the displayed settings, change only the options needed for your output and compare the result with your source.
    3. Run the task, review the actual result and copy or download a checked copy.

    Choosing the settings

    OptionWhat changes
    OptionsCreate a password-protected copy of an unencrypted PDF, locally. Start with the displayed settings, change only the options needed for your output and compare the result with your source.
    LimitsOne unencrypted PDF up to 50 MiB and 300 pages. Reject damaged documents, signatures and interactive forms; export an unsigned, flattened copy first. The original stays unchanged. Check the output in a PDF viewer. AES-256 opening-password encryption through qpdf. Require matching nonempty passwords, 8–127 UTF-8 bytes; do not trim or normalize passwords. Do not save or recover passwords. No editing/printing restriction guarantee.

    Example and expected result

    A 3-page unencrypted sample exports as an encrypted 3-page PDF. Reopening requires the exact chosen password; an incorrect password must fail.

    If it is not working

    • The passwords do not match. Re-enter both fields; the original PDF is kept.

    Formats and limits

    One unencrypted PDF up to 50 MiB and 300 pages. Reject damaged documents, signatures and interactive forms; export an unsigned, flattened copy first. The original stays unchanged. Check the output in a PDF viewer. AES-256 opening-password encryption through qpdf. Require matching nonempty passwords, 8–127 UTF-8 bytes; do not trim or normalize passwords. Do not save or recover passwords. No editing/printing restriction guarantee.

    FAQ

    What does this tool do?

    Create a password-protected copy of an unencrypted PDF, locally.

    Which setting should I choose?

    Create a password-protected copy of an unencrypted PDF, locally. Start with the displayed settings, change only the options needed for your output and compare the result with your source.

    What are the limits?

    One unencrypted PDF up to 50 MiB and 300 pages. Reject damaged documents, signatures and interactive forms; export an unsigned, flattened copy first. The original stays unchanged. Check the output in a PDF viewer. AES-256 opening-password encryption through qpdf. Require matching nonempty passwords, 8–127 UTF-8 bytes; do not trim or normalize passwords. Do not save or recover passwords. No editing/printing restriction guarantee.

    Why did processing fail?

    The passwords do not match. Re-enter both fields; the original PDF is kept.

    Is my input uploaded or saved?

    No. Processing runs on your device. Inputs and results stay in this page’s memory until you clear it or leave. They are not uploaded, logged or stored by ToolRobin. Copying places the result on your device’s clipboard.

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