Convert SIG to PDF

A recipient may need a PDF when a .sig attachment must be viewed, printed, submitted, or retained in a document system that cannot open its source format. The extension is ambiguous, so the correct method depends on the software or device that created the file.

What a SIG file can contain

.sig is not a single standard format. It can be a Broderbund The Print Shop project, a detached OpenPGP/GnuPG signature, a proprietary handwritten-signature record, or data from specialist software.

A Broderbund Print Shop .sig file is a project layout, often containing editable text, images, and page settings. It must normally be opened in a compatible Print Shop version before it can be exported or printed.

A detached cryptographic signature, commonly named like report.pdf.sig, contains verification data for another file; it is not the signed document and cannot be rendered meaningfully as a PDF. Signature-capture files can contain pen strokes, timestamps, certificate data, or encrypted biometric information and usually require the supplier's software.

Identify the source before converting. Check the email, device, or application that produced the file; on macOS or Linux, run file input.sig. For a possible OpenPGP signature, run gpg --list-packets input.sig.

Why PDF is used

PDF stores fixed pages containing text, fonts, vector graphics, and images, so recipients can view and print the same layout without the original application. A PDF export can preserve visible page design, but it does not automatically preserve editable project data, signature biometrics, or cryptographic verification data.

Creating a PDF from a visible signature or printing a signed document to PDF creates a new visual copy. It does not retain the validity of an embedded or detached digital signature.

Convert a Print Shop SIG project

1. Install or access the Print Shop edition that created the file. Newer editions may not open every older project, so ask the sender which version was used if opening fails.
2. Open a copy of the .sig file and confirm that text, images, page size, and orientation are correct. Restore any missing linked images or fonts before export.
3. Use File → Export → PDF or File → Save As if that edition offers PDF output.
4. If there is no PDF export, use File → Print and select Microsoft Print to PDF on Windows or PDF → Save as PDF in the macOS print dialog.
5. Open the resulting PDF in Adobe Acrobat Reader, Preview, or another PDF viewer and inspect every page before sending it.

Direct export is preferable when available because it may retain vector text and graphics. Print-to-PDF is a practical fallback, but some applications flatten pages into images or alter transparency and color handling.

Handle cryptographic and signature-capture files

For a detached GnuPG/PGP signature, locate the original signed file and verify it rather than converting the .sig file. For example, use gpg --verify report.pdf.sig report.pdf; if verification succeeds and report.pdf is already a PDF, use that original file. If the signed original is another format, convert the original with its native application after verification.

For a signature-capture or vendor-specific file, open it with the vendor's desktop application and use its PDF or audit-report export. If it can only display the record, print it to a PDF printer. Retain the original .sig, associated document, certificates, and audit data when signature validity, signing time, or biometric evidence matters.

Adobe Acrobat, Microsoft Word, and generic image converters cannot decode arbitrary .sig files merely because the extension is present.

Online conversion and output checks

Generic online converters rarely support proprietary SIG variants and should not be used for cryptographic signatures. Use a vendor-operated web service only when it explicitly supports the exact source format and organizational privacy rules permit upload.

If the source software first exports a non-confidential image such as .png or .jpg, reputable services such as Adobe Acrobat online or iLovePDF can create a PDF; desktop alternatives include Preview on macOS and Adobe Acrobat. These services convert the exported image, not the original SIG data.

Set the correct page size and orientation before printing. Use vector output when offered; for raster scans or signature images, use about 300 dpi for print output. Higher resolution cannot recover detail absent from the original capture, and a PDF printer may place a small signature image on a mostly blank page if the source application's print layout is not configured.