PortableSigner is a signing (with X.509 certificates) program for PDF files. It’s possible to sign PDF documents digital with X.509 certificates. This signed documents are read only. Therefore it’s possible to implement “electronic paper”.
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PortableSigner
Alternatives
| # | Image | App Name | Features | Platforms | Price | Website Link |
| 2 |  |
Foxit PDF Creator | Discontinued | Windows | Commercial | Website |
| 3 |  |
PDFLab | Discontinued | Mac | Free | Website |
| 4 |  |
PDFTK Builder | PortableApps.com Windows |
Free | Website | |
| 5 | PyPDF2 | Mac Windows Linux |
Free | Website | ||
| 6 |  |
Ashampoo PDF Pro | Windows | Commercial | Website | |
| 7 |  |
XolidoSign | Web | Windows | Freemium | Website |
| 8 |  |
VeryPDF PDF Editor | Windows | Commercial | Website | |
| 9 |  |
PDFZilla | Windows | Commercial | Website | |
| 10 |  |
SignNow | iPhone iPad |
Commercial | Website | |
| 11 | OpenSignature | Mac Windows Linux |
Free | Website | ||
| 12 |  |
jPdf Tweak | Discontinued | Mac Windows Linux |
Free | Website |
| 13 |  |
PDF Pro | Web | Freemium | Website | |
| 14 |  |
Advanced PDF Utilities Free | Warning | Windows | Free | Website |
| 15 |  |
PDFTools | Discontinued | Windows | Free | Website |
| 16 |  |
PdfMod | Discontinued | BSD Linux |
Free | Website |
| 17 |  |
Adobe Fill & Sign | Android iPhone Android Tablet iPad |
Free | Website | |
| 18 |  |
PDF Toolbox | Windows | Commercial | Website | |
| 19 |  |
PDF Signer | Mac | Commercial | Website | |
| 20 |  |
Nitro Pro | Windows | Commercial | Website | |
| 21 |  |
JSignPdf |
Apache OpenOffice LibreOffice Discontinued |
Mac Windows Linux |
Free | Website |
| 22 |  |
PDF Reader | Android iPhone Android Tablet iPad |
Freemium | Website | |
| 23 |  |
DigiSigner | Web | Self-Hosted | Freemium | Website |
| 24 | PDF-Suite | Windows | Commercial | Website | ||
| 25 |  |
Adobe Acrobat DC | Mac Windows |
Commercial | Website | |
| 26 |  |
PDF Studio | Mac Chrome OS Windows Linux |
Freemium | Website | |
| 27 |  |
PDFClerk Pro | Discontinued | Mac | Commercial | Website |
| 28 |  |
Fill and Sign PDF Forms | Android | Free | Website | |
| 29 |  |
SignBox | iPhone iPad |
Free | Website | |
| 30 |  |
DottedSign | Web | Android iPhone Android Tablet iPad |
Freemium | Website |