Skip to main content

PDF Batch Signer

Upload drawings, design one signature, place it once, and export a ZIP of signed PDFs without leaving the browser.

Open utility

pdf-batch-signer utility screenshot

What it does​

Create a reusable signature by drawing, typing, or uploading a scan, place it on a live preview, and apply it across every page in your PDF stack. Optional Gemini analysis can read title blocks when you provide your own API key; otherwise everything stays local.

When to use it (and when not to)​

Use it when:

  • You need to stamp multiple drawings or reports in one pass without a cloud service.
  • You want a consistent placement for every page in a package.
  • You need a quick ZIP of signed PDFs to send to vendors or QA.

Avoid it when:

  • You require cryptographic or certificate-based signatures.
  • Your pages use widely different sizes that need unique placements per page.

Inputs and outputs​

Inputs​

InputDescription
PDF stackOne or more PDFs to stamp in a single run.
Signature sourceDraw, type, or upload a signature image to reuse.
Placement and scalePosition and size the signature on the preview before applying.
Optional Gemini API keyIf you want title block extraction; otherwise everything stays offline.

Outputs​

OutputFormatNotes
Signed PDFsZIPAll input files stamped with the same placement.
Preview confirmationOn-screenVisual check of the applied signature.

How to use​

  1. Load the PDFs you need to sign.
  2. Create or upload a signature and set its placement and size.
  3. Optionally add a Gemini API key if you want title block metadata extraction.
  4. Apply the signature across all pages.
  5. Download the ZIP of signed PDFs.

Example dataset: Upload ten drawing PDFs, draw a signature, place it 20 mm from the bottom-right corner, leave Gemini off, and export the ZIP.

  • Expected output: Downloads a ZIP containing all drawings with the same visible signature placement on every page.

Accuracy and verification​

  • Applies a graphic stamp, not a digital certificate; verify acceptance for regulated documents.
  • Mixed page sizes may need a quick visual check after signing.
  • Optional Gemini extraction uses your key client-side; leave it empty to keep everything offline.
  • Retain originals if you need an audit trail; the tool overwrites only the downloaded copies.

FAQ​

  • Is this a digital certificate? No. It is a graphic signature applied locally.
  • Will my files upload anywhere? No. Signing runs with pdf-lib and JSZip in your browser.
  • Can I handle mixed page sizes? Yes, but confirm placement on a sample page before exporting the full set.
  • How do I change the stamp later? Load the files again, adjust the signature, and re-export.
  • What about timestamps? Add date text inside your signature image or re-run with an updated label.

Changelog​

  • Initial documentation.

Feedback / bug report​

LinkedInGitHub