TR
EN
DEWindows desktop e-signature software
E-Signature Software: Sign PDF Documents with a Smart Card
Sign your PDFs with your smart card, one by one or in bulk, without the document leaving your computer.
Insert the card, enter your PIN and pick the files; BYK eSigner adds the signature and validation data and can add a timestamp. You also verify signed PDFs you receive on the same screen.
- Documents are not uploaded; the signature is created on your computer
- In bulk signing, faulty files are skipped and reported
- Signing with an expired certificate is blocked
- Chain, revocation and timestamp in one table
- SHA-256; RSA and ECDSA keys
- Timestamp support
- Chain validation with the Windows trust store
- Windows, MSI installer
- AKİS and SafeNet card settings included
- Visible signature with text and image
From inserting the card to a signed PDF
The steps in the help screen are the application's real order; the log shows what happens at each step.
- Card detectedInserted cards are listed with the holder's name and can be rescanned.
- PIN and connectThe certificate is read; if expired, signing stays locked.
- Choose PDFsOne or more PDFs are selected and an output folder is suggested.
- Reason and visible signatureA reason, text and image can be added; for a single file the area is drawn on the preview.
- Signing with the cardEach file's hash is signed on the card and added to the PDF; earlier signatures stay intact.
- TimestampIf enabled in settings, a timestamp is obtained from the timestamp server.
- Validation dataThe signer's OCSP response, CRL and certificate chain are embedded.
- Report and verificationFaulty files are listed; signed PDFs are verified in the same app.
Sign dozens of PDFs at once and see the result in one table
Sign reports, certificates or quotations with one PIN without opening each file, and check incoming signed documents in bulk.
- Multiple selectionSeveral PDFs are selected in the file dialog and signed in turn.
- Errors do not stop the jobA problem file is skipped and listed with its name and reason at the end.
- Live activity logPreparation, card signature, timestamp and completion are logged live for each file.
- No overwritingIf a file with the same name exists, the new one is saved with a number.
- Bulk verificationSeveral signed PDFs are checked; each signature has its own coloured row.
- Clear resultsSignature, chain, OCSP/CRL and timestamp are shown as valid, revoked, warning or none.
Why BYK eSigner?
- Documents stay on your computerOnly the hash goes to the card; the PDF is never uploaded.
- No interruption in bulk signingOne faulty file does not stop the job; the result is reported as partially completed.
- Files are never overwrittenIf the name exists, the output is numbered automatically.
- Signing and verification togetherThe chain is checked against the Windows trust store, revocation via OCSP/CRL.
- Sequential second signatureEarlier signatures are kept and visible areas do not overlap.
- Visible signature by areaThe signature area is drawn with the mouse on the preview; text and logo can be combined.
- Card errors in plain languageWrong PIN, blocked or missing card appear as clear messages instead of codes.
- Local signing service for web appsA separately installed Windows service lets browser applications sign with the local card.
Module details
Click a heading to open the details of that module.
Sign Your PDF Documents with a Secure E-Signature
BYK eSigner is a stand-alone desktop e-signature application for Windows, built to sign PDF documents with a qualified electronic certificate. Insert your smart card or USB token, enter your PIN and sign your documents in a few clicks. Documents are not sent to a server for signing; the signing takes place on your own computer.
- Smart card and USB token support (PKCS#11)
- Single or batch signing
- Timestamp and long-term validation data
- Visible signature field
- Signed PDF verification
- Windows installer package
Easy to Use: Select the Card, Connect, Sign
The software finds the cards attached to the computer by itself and selects the certificate automatically. The signing steps move forward on screen in order, and the status is shown in colour throughout.
- Select the card and enter your PIN
- Prepare the certificate with "Connect"
- Select the PDF files to sign
- Choose the folder for the signed files
- Optionally add a signing reason and a visible signature
- Finish with "Start Signing"
Situations such as a wrong PIN, a blocked card, a missing card or an expired certificate are reported with clear messages instead of technical error codes. Signing with an expired certificate is not allowed.
Batch Signing and Activity Log
There is no need to open and sign dozens of certificates, reports or quotations one by one. Several PDFs are selected and signed in one go. The result of each file appears in the activity log; a problematic file does not stop the job, it is skipped and failed files are listed at the end.
- Failed files reported in batch signing
- Signed files saved in a separate folder without overwriting files of the same name
- The output folder opened directly with "View Signed Files"
Timestamp and Long-Term Validation
A timestamp is added to the signature, so the moment of signing is proven by an independent timestamp server. The server address, user details and timeout are defined in the settings screen.
During signing, validation data on the revocation status of the certificate (OCSP/CRL) is embedded in the document, so the signature remains verifiable even after the certificate expires.
Visible Signature Field
The signature does not have to stay embedded in the document only; a visible signature field can also be created on the PDF page. The signature text or image is placed in the area selected on the page with the mouse. The signing reason is added to the signature details.
PDF Signature Verification
You can check the validity of signed PDFs you receive with the same software. Several files are verified together and the results are shown in a single colour-coded table.
- Signature integrity: whether the document was changed after signing
- Certificate chain validation against the Windows trust store
- Certificate revocation check via OCSP/CRL
- Presence of a timestamp
- A clear warning for corrupt or incomplete PDFs
Use with Web Applications
In addition to the desktop application, a local signing service running on the computer is offered so that web-based applications can obtain smart card signatures through the browser. Documents prepared in internal web applications can then be signed with the user's own card.
For e-signature workflows in our laboratory software, see the KALDATA Calibration Laboratory Management Software and Testing Laboratory Software pages.
Frequently Asked Questions About the E-Signature Software
Which operating system does it run on?
It runs on Windows computers and is installed with a Windows installer package.
Are my documents sent to a server?
No. Signing takes place on your own computer; only the timestamp and revocation services are contacted.
Can I sign several documents at once?
Yes. In batch signing all PDFs are signed in one go and failed files are listed at the end.
Can I check whether a signed PDF is valid?
Yes. The signature, certificate chain, revocation status and timestamp are verified on one screen.
Can I add a visible signature?
Yes. The signature text or image is printed in the area you select on the PDF.
How can I get it?
Contact us through the quote and demo request form or by phone.
View Screenshots
