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PDF SealBox guide

Add Company Seal to PDF

Add a company seal to a PDF by using a clear seal image, previewing placement, and checking important text before export.

Open the PDF stamping tool

When this workflow is enough

This workflow is enough for visible company approval marks, internal circulation copies, invoice confirmation, and non-certificate document review.

When this workflow is not enough

It is not enough when company policy requires cryptographic signing, identity verification, or approval in a regulated signing platform.

Practical guidance

Use a seal image that your organization has authorized for this document type. Keep the original image in its approved location, use a transparent PNG where possible, and preserve its proportions. Stretching a circular company seal makes the lettering and emblem look unreliable; enlarging a low-resolution screenshot makes the exported mark soft or jagged.

The right position depends on the document. A contract may reserve an execution area, an invoice may have a confirmation area, and a quotation or cover letter may have a clear space near the company name. Do not reuse one position blindly: keep the seal clear of amounts, dates, signatures, names, QR codes, page numbers, and clauses a reader must inspect.

Check more than the first page when the PDF mixes portrait pages, landscape tables, scanned attachments, or pages with rotation. The same coordinate can look balanced on a letter page but cover a footer or be clipped on a landscape attachment. Set the range first, then review representative pages before generating the final file.

After export, reopen the PDF in an independent reader at normal zoom. Check clarity, scale, page range, and the relationship between the seal and nearby fields. For documents that may be printed, inspect a printed test page as well. A visible company seal image is not proof that a person or organization authorized the document.

Step-by-step guide

  1. Prepare a clear, authorized company seal image, preferably a transparent PNG with sensible cropping.
  2. Open the PDF and identify the pages and document fields that should receive a visible seal.
  3. Choose the seal image, set the page range, and keep the original aspect ratio while adjusting size, opacity, and rotation.
  4. Use the preview to place the seal in the document-specific clear area, away from dates, amounts, clauses, signatures, QR codes, and page numbers.
  5. Review portrait, landscape, scanned, and rotated pages separately when the PDF contains mixed layouts.
  6. Export the PDF, reopen it at normal zoom, and check the final page range and seal clarity before sharing it.

Common mistakes

  • Using an unapproved, outdated, or copied seal image without confirming authorization.
  • Stretching a circular seal instead of scaling it proportionally.
  • Placing the seal over totals, dates, signature blocks, QR codes, or contract clauses.
  • Assuming one placement works on portrait pages, landscape tables, and scanned attachments.
  • Exporting without reopening the file to check clarity, clipping, and page range.

Need help with privacy or limits?

Read the FAQ for shared answers about local processing and visible-stamp limits, or use the User Manual for the current workflow.

Frequently asked questions

Where should a company seal go on a PDF?

Use the document's reserved approval area or clear space near the relevant company information. Keep dates, signatures, amounts, QR codes, page numbers, and contract clauses readable.

Can I use a JPG company seal?

You can, but a transparent PNG usually looks cleaner because it avoids a white background box over the PDF.

Can the same company seal be added to every page?

Yes, when the same placement is appropriate. Review landscape, scanned, cover, and attachment pages because their layouts may need different treatment.

Why does the seal look blurry after export?

The source image may be too small or enlarged too far. Start with a clearer original image and reduce the visible size rather than enlarging a screenshot.

Should I use the same position for contracts and invoices?

Not automatically. Different document types reserve different fields, so choose a position after reviewing the actual page layout.

Does a company seal image prove authorization?

No. It is a visible mark. Authorization depends on your organization policy and legal workflow.

Key takeaways

  • Use a clean, authorized seal image.
  • Check placement against important contract text.
  • Transparent PNG is usually the best format.
  • Visible seals do not verify signer identity.

Stamp All Pages in PDF

You can stamp all pages in a PDF by setting the page range to all pages and checking placement page by page.

Cross-Page Seal PDF

A cross-page seal splits a visible seal across multiple PDF pages so page continuity can be checked visually.