When should I use PDFQFZ.WPF?

Use the offline Windows desktop app for confidential files, encrypted output, certificate workflows, or any PDF that should never be uploaded.

Secure PDF Stamping

PDF Stamp Generator

Q: Will my PDFs be stored on your server?

The default browser workflow processes PDFs locally and does not intentionally upload or store user PDF files on the server.

Add image stamps, cross-page seals, page-specific stamps, rotation, opacity, batch output, and visible signature marks directly in your browser.

Data safety first Default mode keeps files in your browser. Our server does not keep uploaded PDFs.

Files & Output

Choose one or more PDFs. Folder mode is supported in browsers that expose directory selection.

Files Folder

Source PDFs PDFs are read locally by your browser before stamping.

Output mode Stamping strategy

If output already exists, allow stamping it again

Stamp Image

Use a transparent PNG or JPG stamp image. Transparent PNG is recommended for clean seals.

Stamp image Recommended: transparent image, at least 472 px wide.

Preset stamps

Size (mm) Rotation angle Opacity (%)

Cross-page stamp Regular stamp

Page edge Position (%) Max sections

After rotation PDF password / encryption

Randomize position and rotation slightly Vary stamp size by page, minimum 90%

Digital Signature

Browser mode can place a visible signature mark. Cryptographic PFX signing requires a server signing service or the offline desktop app.

Signature mode Signature name

Certificate file This field is reserved for the future WooCommerce/member server workflow.

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Select a PDF to preview it here When a regular stamp is enabled, click the preview to adjust the current page position.

Tip: Browser mode keeps files local. Flattening, output encryption, and real PFX digital signatures require a server-side signing pipeline or the offline PDFQFZ.WPF tool.

Offline Desktop App

For privacy-sensitive files, download PDFQFZ.WPF and process everything without network upload.

PDFQFZ.WPF

Requires account login and a one-time $9.9 purchase. The purchase flow is prepared for WooCommerce or a membership plugin.

Fully offline PDF stamping on Windows.
Supports encrypted output and PFX certificate workflows.
Better choice for confidential contracts and internal documents.

$9.9 Log in to buy Login is required before purchase.

FAQ

Common questions about browser-based PDF stamping and secure file handling.

Will my PDFs be stored on your server?

The default browser mode processes files locally. If a future server fallback is used, files should be deleted after processing and not retained.

Can it add cross-page stamps?

Yes. Browser mode can split the stamp image across pages and place it on the selected edge.

Does browser mode support true PFX signing?

Not as a pure browser feature. Use a server signing workflow or PDFQFZ.WPF for certificate-based signing.

Which PDF library is used?

The browser tool uses pdf-lib, a free MIT-licensed JavaScript library, for local PDF modification.

What are you looking for?