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About Sealium
What does Sealium do?
Sealium is a document validation API that verifies the cryptographic integrity and legal validity of signed electronic documents. It accepts PDF, PAdES, CAdES, XAdES, ASiC-E, ASiC-S, KRX, and JAdES formats, processing files up to 50 MB. The service checks signature integrity, certificate chains, OCSP revocation, qualified timestamps, and eIDAS trust lists in a single pass, returning a structured JSON report.
What problem does Sealium solve?
Organizations in regulated EU and CEE industries often need to prove that an electronic signature is legally binding — especially a Qualified Electronic Signature (QES), which carries the same legal weight as a handwritten signature across all 27 EU member states. Building this on the open-source EU DSS library requires significant engineering effort. Sealium wraps that complexity into a simple API call, delivering an audit-ready report without managing certificates or infrastructure.
Who is Sealium for?
Sealium is built for developers, compliance teams, and IT leaders in banking, insurance, legal tech, and public administration — particularly in Central and Eastern Europe. It is the only platform with native KRX container support, the Hungarian government document format, and verifies DÁP qualified signatures and AVDH-authenticated documents out of the box. It is not for teams that need human document review or a full e-signature workflow platform.
Key features
- eIDAS signature level detection — Returns QES, AdES, or unknown levels, so you instantly know if a signature is legally binding across the EU.
- Native KRX container support — Validates the Hungarian government format used by banks, insurers, and public administration.
- Privacy by design — Processes documents in-memory and discards them after validation; only the JSON report is stored, never the original file.
- Batch processing — Validate up to 50 documents in a single job with webhook callbacks, partial success handling, and per-document results.
- EU DSS based — Built on the same trusted open-source library, with the engineering road already paved for production use.
SaaSpartout Score
7.6
/10
Editorial score from our review methodology — not user ratings.
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Sealium Pricing
Sealium pricing: from €0.
For comparison: the median starting price in Cybersecurity is $8.25/month, measured across 105 tools we track. See the full SaaS Pricing Index →
Free tier
Start with a free plan: make API calls to validate documents, get eIDAS signature levels (QES/AdES), and test the service with no charge. Perfect for evaluation and small projects.
Paid tiers
Production pricing scales with volume. For higher usage limits and features like batch processing with webhooks, contact Sealium for a quote based on your document validation volume. No credit card is required to start.
All paid plans include the full feature set: batch validation, webhook callbacks, and audit-ready JSON reports.
Frequently asked questions
What is Sealium used for?
Sealium is a document validation API that verifies the legal validity of electronic signatures (eIDAS QES/AdES), checking cryptographic integrity, certificate chains, and timestamps. It's used by banks, insurers, and public administration to prove a signature is legally binding.
Is there a free trial or free plan for Sealium?
Yes, Sealium offers a free plan that lets you send documents to the API and receive validation reports without cost. This is ideal for testing before committing to a paid tier.
How much does Sealium cost?
Sealium is free to start. Paid plans are volume-based; contact the vendor for pricing tailored to your expected document validation volume. Higher tiers add batch processing and webhook features.
Who is Sealium best for?
It's best for developers and compliance teams in banks, insurance companies, legal tech, and public administration in the EU and CEE — especially those dealing with Hungarian KRX format or needing to verify QES-level signatures quickly.
What are the top alternatives to Sealium?
Alternatives include building your own validation on the open-source EU DSS library, or using other e-signature platforms like DocuSign or Adobe Sign — though these may not offer the same deep eIDAS and KRX validation capabilities for existing signed documents.
Does Sealium store my documents?
No. Documents are processed in-memory and discarded immediately after validation. Only the structured JSON report is stored, making it GDPR-friendly by design.
