Sign with Turkish ID card
Customers sign with the chip on their ID card and a PIN, without buying a qualified certificate.
E-Signature & E-Document Process Management
SignSign runs and oversees the electronic signature and e-documentation process for contracts under Law No. 5070.
Process management for signatures made with a Turkish ID card or qualified certificate under Law 5070. RFC 3161 timestamps, PAdES-B-LTA archiving and verification links.
- organisations signing with Sign
- 89+
- ready-made signing flows
- 5
- PAdES long-term archive level
- B-LTA
- free contracts in the first month
- 20
Overview
Sign runs and oversees the electronic signature and e-documentation process for contracts under Law No. 5070.
Sign is a platform that manages the electronic signing of contracts and forms that used to need a wet signature, and their archiving as e-documents, under Turkish Electronic Signature Law No. 5070. Customers sign with their chip-enabled Turkish ID card (TCKK) and PIN, so they don't have to buy a certificate. The organisation's authorised signatories sign with a qualified electronic certificate (NES).
Sign Bilişim is not an electronic certificate service provider and does not issue electronic certificates. Qualified electronic certificates are issued by electronic certificate service providers authorised by Türkiye's Information and Communication Technologies Authority (BTK). Sign Bilişim runs and oversees the electronic signature and e-documentation processes for signatures made with those certificates. Signing order, signer requirements, timestamp and archive steps and the verifiability of the document are controlled within that process.
Each signature gets an RFC 3161 compliant timestamp, and the document is upgraded automatically to the PAdES-B-LTA long-term archive level. The certificate chain and the validity and revocation evidence are embedded in the file, so the signature can still be verified years after the certificates expire. The private key stays on the card, and the server only prepares the document hash.
Ready-made flows cover single-customer standard contracts, doorstep signing in the field and multi-party corporate agreements. Internet service providers and other organisations, more than 89 in total, run the signing of their subscription and contract paperwork on Sign. A REST API and webhooks connect it to your existing CRM and subscription systems.
- Developed / operated by
- Sign Bilişim ve Sanayi A.Ş.
- Website
- sign.wi.tr
- Category
- E-Signature & E-Document Process Management
- Status
- Live
Compliance & standards
- 5070
- ETSI PAdES (EN 319 142)
- RFC 3161
- KVKK
- eIDAS (PAdES profilleri)
- ISO 27001
- ISO 9001
Sign
Key features
Qualified e-signature (NES)
Authorised signatories sign with a NES obtained from an authorised provider. The signature value is created on the card, so the private key never reaches the server.
Timestamp & LTA
Every signature gets an RFC 3161 compliant timestamp and the document moves up to PAdES-B-LTA automatically.
Multiple signers (Mode X)
Any number of signers sign in a fixed order, each with its own NES or TCKK requirement, and the next one gets a link, SMS or email automatically.
Verification link & QR code
Every signed document gets its own shareable verification page and a QR code for quick checks.
Open API & webhooks
REST API, Swagger documentation, a Postman collection and a webhook on every status change.
Capabilities
Signing flows
- Standard flow: the customer signs with TCKK and an authorised signatory closes with NES
- Field sales: several customers plus a field agent, signing at the door on tablet or phone
- Full chain: customer and agent signatures are timestamped separately and an authorised signatory closes with TCKK or NES
- Institutional closing: corporate approval with no customer step, adding a new archive timestamp to a signed document to refresh its archive level (re-LTA)
- Mode X: any number of signers, strict order, automatic timestamp and LTA
- Custom signing chains for your workflow, built through the API
Key & data security
- The private key stays on the card and the server only prepares the document hash
- WYSIWYS: the PDF is frozen before signing, so preview and signature use the same bytes
- Certificate chain, revocation evidence and archive timestamp are embedded in the document
- Per-company data isolation with database row-level security (RLS)
- Turkish ID numbers are stored masked and PINs are never logged at any layer
- Data is hosted in Türkiye
Integration & delivery
- REST API, Swagger (OpenAPI) and a Postman collection
- Webhook notification on every status change
- Automatic delivery of completed documents to Dropbox, Google Drive, FTP, SFTP or email
- Free analysis tool for PDFs signed on other platforms
- Plugin-free browser support: Chrome, Edge, Firefox, Safari, Opera
- Works on Windows, macOS and Ubuntu
How it works
- 01
Prepare the document and flow
Send the contract from the portal or through the API. Set the signers, their order and whether each one signs with TCKK or NES.
- 02
Signers sign
The customer signs with ID card chip and PIN, and the authorised signatory with NES. The next signer is notified by link, SMS or email.
- 03
The document is archived
Each signature gets an RFC 3161 compliant timestamp and the document is upgraded to the PAdES-B-LTA long-term archive level.
- 04
Deliver and verify
The signed document goes to your chosen destination automatically. Anyone can check it through the shareable link or QR code.
Integrations
- REST API
- Swagger (OpenAPI)
- Postman
- Webhook
- Dropbox
- Google Drive
- FTP
- SFTP
- E-posta
Ecosystem
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Learn moreFrequently asked questions
Does Sign Bilişim issue electronic certificates?
No. Sign Bilişim is not an electronic certificate service provider and does not issue qualified electronic certificates. Qualified certificates are obtained from electronic certificate service providers authorised by BTK. Sign Bilişim runs and oversees the electronic signature and e-documentation processes for signatures made with those certificates and with Turkish ID cards.
Do our customers need to buy an e-signature certificate?
No. Customers sign with their chip-enabled Turkish ID card and PIN. A qualified electronic certificate (NES) is only used where the flow calls for it, for example for the organisation's authorised signatories.
How can a signed document be verified years later?
The evidence needed to verify it is stored inside the file. At PAdES-B-LTA level the certificate chain, validity and revocation evidence and an archive timestamp are embedded, so the signature still checks out after the certificates expire. Each document also has a shareable verification link and QR code.
Is the private key sent to the server?
No. The server only prepares the document hash and the signature value is generated inside the card, so signing on the server is technically impossible. PINs are never logged at any layer.
Can we check PDFs signed on another platform?
Yes. Upload the PDF to the free document analysis tool to see whether its signatures, certificate chain and timestamps are valid.
Can we integrate Sign with our own software?
Yes. There is a REST API with Swagger (OpenAPI) documentation and a Postman collection, and a webhook fires on every status change. You can send documents for signing from your own panel and build custom signing chains through the API.
Is there a free trial?
Yes. New portal accounts get 20 free contracts for the first month. No installation or credit card is needed, and there is no obligation if you stop.
Have a project in mind?
Tell us briefly what you want to set up, or give us a call. We'll pass it to the right team.