Signing multiple PDFs at the same position is one of the most repetitive document tasks there is. A school principal issuing certificates, an HR team sending offer letters, or a finance office approving a month of invoices all face the same problem: identical templates, dozens of files, and one mark โ a signature, a date, a stamp โ that has to land on the exact same spot in every single one. This bulk PDF signer removes the manual work: you position the mark once on a template preview, and it is applied to that same position across every uploaded PDF.
It is a bulk sign PDF and batch stamp PDF tool in one: upload all the PDFs (up to 100 files or 300 MB), pick Signature, Date, Stamp/Seal, or Watermark, click and drag on the first page to set the bounding box, preview the result on your first file, and hit apply. Whether you need to add a signature to multiple PDF files, add a date to multiple PDF certificates, or stamp PDF documents in bulk with an approval mark, the workflow is identical.
Position once, apply everywhere โ the certificate use case
Imagine 20 individually generated student certificate PDFs: same elegant template, different names. With this tool you upload all 20, drop in your signature image and today's date, position them once on the preview page, and download 20 completed certificates โ the identical UIN of each PDF preserved, marks pixel-consistent, zero manual openings. The preview-and-confirm step renders your first file with the marks composed on it, so you see exactly what will land on all 20 before any processing runs.
Watermarks, seals, and every-page targets
Watermarking is a first-class mark type here. Choose text ("DRAFT," "CONFIDENTIAL") with a rotation angle and opacity, or an image watermark โ then choose which pages receive it: page 1 of every PDF, every page of every PDF (the standard for a pdf watermark multiple files job over a whole document pack), or one specific page number across the batch. Official seals and "Verified"/"APPROVED" stamps work the same way, so a registrar can mark an entire multi-page document set in a single pass.
Private by architecture, not by policy
Every file is decoded, stamped, and re-encoded inside your browser tab using pdf.js and pdf-lib WebAssembly. There is no upload endpoint and no server-side processing โ which is exactly what makes this viable for certificate runs, legal documents, and internal HR letters. The only things this page ever sends over the network are static scripts and fonts; your PDF contents and file names never are. (And as with any shortcut that summarizes "e-signing": the mark this tool applies is a visual overlay โ not a cryptographic digital signature, and not legally binding as one. For documents that legally require certified e-signatures, use a regulated provider.)
- Signature, date, stamp/seal & watermark marks โ multiple per page, all repositionable
- 3 page targets: page 1 of every PDF, every page, or one specific page number
- Transparent PNG support with an alpha-channel warning for opaque images
- Page-size mismatch detection with skip-and-flag or force-apply proportional scaling
- ZIP download for all processed files, plus individual downloads on mobile
Whether you're preparing a batch of certificates for graduation day, stamping approved invoices for the archive, or watermarking a confidential deck before sending it out โ try it now with the tool above. Upload your files, place your marks once, and download the whole batch signed, dated, and stamped.