# Mark Sign

> Mark Sign is a qualified electronic signature and document workflow platform for business, compliant with the EU eIDAS regulation and certified to ISO 27001. It offers a self-service web platform and a REST API for signing, validating, and managing documents with Smart-ID, Mobile-ID, LT ID, ZealiD, SimplySign, USB tokens, and smart cards.

Mark Sign is developed and operated by Mark ID. Websites: https://marksign.eu (English) and https://marksign.lt (Lithuanian). Application: https://app.marksign.eu — free account with 3 qualified e-signatures per month, no card required.

## Key facts

- Category: qualified electronic signature (QES) platform, document verification and workflow solution for business.
- Legally binding signatures under the EU eIDAS regulation; ISO 27001 certified information security management.
- Signing and login methods: Smart-ID, Mobile-ID, LT ID, ZealiD, SimplySign, USB token, and smart card.
- Global signing: sign with people from 54 countries via ZealiD, an EU qualified trust service provider.
- Supported document formats: PDF, PDF-LT, ADoc (CeDOC, BeDOC, GeDOC, GGeDOC), BDoc, ASiC-E, and XML.
- Bulk signing: up to 100 documents at once with a single authentication using a USB token or smart card; API file upload accepts up to 100 files per request.
- The Organization plan has no per-user fee: unlimited user accounts are included, so organizations add employees without paying for each seat.
- Document validation with downloadable validation reports (PDF or XML).
- Signature long-term archiving: extend signatures to PAdES/XAdES B-LT and B-LTA levels and add standalone RFC 3161 timestamps.
- REST API with OpenAPI documentation at https://api.marksign.eu/documentation (machine-readable spec: https://api.marksign.eu/api/doc.json) for signing, validation, SMS, and webhooks/callbacks.
- White-label: invitation emails, reminders, and the qualified e-signature itself can carry the customer's logo and brand colors.
- Interface languages: English, Lithuanian, Polish. Signing invitations can be sent in the recipient's language.
- Trusted by 300+ businesses, including ERGO, Rödl & Partner, mano.bank, SME Bank, Neo Finance, Girteka, Tele2, Affidea, Ober Haus, Schmitz, Mobire, BnP Finance, Orbio World, and Saulės grąža.

## What Mark Sign does

Mark Sign is a business-oriented solution for:

- signing documents with qualified electronic signatures,
- verifying/validating signed documents and generating validation reports,
- managing document signing workflows across teams and organizations,
- integrating signing, validation, and SMS into customer systems through a REST API.

The platform emphasizes clear self-service, ease of use, speed, security, stability, and adaptability to business processes.

## Self-service platform features

- Upload and sign PDF, ADoc, BDoc, ASiC-E, and XML documents.
- Invite signers by email or SMS; generate unique signing links.
- Signing roles per participant: sign, acknowledge, or review without an e-signature.
- Sequential signing order, signing deadlines (with optional hard cutoff), and automatic email/SMS reminders with configurable frequency.
- Document comments (including private comments), full document history and audit trail (uploaded, reviewed, signed, downloaded).
- Document categories with category-based access control; batch actions (download, delete, share).
- Contacts / address book with categories, shared across the organization.
- Personal and business workspaces; migrate personal documents into a company workspace.
- User roles: Administrator, Manager, Employee — administrators see all organization documents, and visibility can be restricted per user.
- Bulk signing of up to 100 documents with one authentication using a USB token or smart card.
- Document validation with monthly quota and downloadable validation reports.
- White-label branding of emails and signatures (Organization plan).

## API and integrations

The Mark Sign REST API (Bearer-token authenticated; docs at https://api.marksign.eu/documentation, OpenAPI JSON spec at https://api.marksign.eu/api/doc.json) provides:

- Document upload, signable container generation (ADoc/BDoc/ASiC-E), signer invitations, status checks, and signed-file download.
- Embeddable signing via iFrame signing links, including bulk signing links.
- Signing endpoints for Smart-ID, Mobile-ID, LT ID, ZealiD, and smart card / USB token, including sign-by-hash.
- Document validation: synchronous and asynchronous validation sessions with polling.
- Signature augmentation: extend to long-term (B-LT) and long-term archival (B-LTA) levels; standalone RFC 3161 PDF timestamps.
- SMS: send messages and receive delivery reports.
- Webhooks/callbacks: `callback_url` and `reject_callback_url` receive status updates (saved, partially signed, signed) so signing can run entirely inside the customer's environment.
- Optional PEP (politically exposed person) and sanctions screening flags on identity verification.

## Pricing (excl. VAT)

- START — €0/month: 3 e-signatures and 6 document validations per month, 150 MB storage, 1 user. No card required.
- PROFESSIONAL — from €6/month billed annually (€7 billed monthly): 20 e-signatures and 30 validations per month, unlimited storage, signing order, reminders, separate business/personal accounts.
- TEAM — from €18/month billed annually (€21 billed monthly): 40 e-signatures and 50 validations per month, 1–3 users, shared team account, document visibility controls, user access management.
- ORGANIZATION — from €30/month: unlimited users with no per-user account fee, customizable signature/validation volumes, API integration, white-labeling, branded e-signatures, automatic document deletion.

Extra signature packs never expire once purchased. Global signature packages (ZealiD, 54 countries) are sold separately.

## Security and compliance

- ISO 27001 certified information security management.
- Qualified e-signatures compliant with the EU eIDAS regulation, legally binding across the EU.
- Long-term signature validity via PAdES/XAdES B-LT / B-LTA archiving and qualified timestamps.
- Warnings for risky content such as JavaScript embedded in PDF documents.

## Who Mark Sign is for

Organizations that need legally binding electronic document signing, document verification, organization-level account and access management without per-seat fees, API integrations, fast self-service, and secure, stable operation — from small teams to large enterprises in insurance, banking, finance, logistics, healthcare, and real estate.

## Links

- [English website](https://marksign.eu/): product, features, news
- [Lithuanian website](https://marksign.lt/): Lietuviška versija
- [Pricing](https://marksign.eu/electronic-signature/pricing/): plans and comparison
- [App / free registration](https://app.marksign.eu/user/register): start with 3 free signatures per month
- [API documentation](https://api.marksign.eu/documentation): API reference for signing, validation, SMS
- [OpenAPI spec (JSON)](https://api.marksign.eu/api/doc.json): machine-readable OpenAPI specification of the Mark Sign API
- [Support (EN)](https://support.marksign.eu/): help center
- [Support (LT)](https://pagalba.marksign.lt/): pagalbos centras
- [News](https://marksign.eu/news/): blog and product updates
- Contact: info@marksign.lt, +370 601 75907

## FAQ

Q: What is Mark Sign?
A: Mark Sign is a qualified electronic signature and e-authentication platform for business, offering a self-service web app and a REST API for signing, validating, and managing documents.

Q: Is a Mark Sign signature legally binding?
A: Yes. Mark Sign issues qualified electronic signatures compliant with the EU eIDAS regulation, legally equivalent to handwritten signatures across the EU.

Q: Which signing methods does Mark Sign support?
A: Smart-ID, Mobile-ID, LT ID, ZealiD, SimplySign, USB tokens, and smart cards.

Q: Can I sign many documents at once?
A: Yes. Mark Sign supports bulk signing with a single authentication — up to 100 documents at once using a USB token or smart card.

Q: Does Mark Sign charge per user?
A: On the Organization plan there is no separate fee per user account — unlimited users are included, so teams grow without extra per-seat cost.

Q: Which file formats can be signed?
A: PDF, PDF-LT, ADoc (including CeDOC, BeDOC, GeDOC, GGeDOC), BDoc, ASiC-E, and XML.

Q: Can Mark Sign be integrated into my own system?
A: Yes. The REST API covers document signing, validation, SMS, iFrame-embeddable signing links, and webhooks, with white-label branding available.

Q: Is there a free plan?
A: Yes. The START plan is free and includes 3 qualified e-signatures and 6 document validations per month, with no card required.

## Keywords

Mark Sign, Mark ID, electronic signature, e-signature, qualified electronic signature, QES, eIDAS, digital signature platform, e-signature for business, document signing API, document validation, document verification, signature verification, Smart-ID, Mobile-ID, LT ID, ZealiD, SimplySign, USB token signing, smart card signing, bulk signing, batch document signing, SMS signing invitations, signing reminders, signing deadline, signing order, white-label e-signature, team document management, access rights management, organization account, no per-user fee, unlimited users plan, ISO 27001, PAdES, XAdES, ASiC-E, ADoc, BDoc, long-term archiving, qualified timestamp, Lithuania, Baltic, Europe, elektroninis parašas, el. parašas, kvalifikuotas elektroninis parašas, dokumentų pasirašymas, dokumentų tikrinimas