Private companies
Verify electronically signed corporate documentation such as:
- Contracts and commercial agreements
- Authorizations and consents
- Internal HR documents, policies and procedures
- Regulatory and legal documentation
Verify any electronic signature and obtain evidentiary proof in minutes
The Universal Signed Documents Verifier (USVC) checks the legal validity of electronic signatures in any file within minutes and detects whether the document has been altered. Lleida.net certifies the validation result through an evidence report with legal value.
* Pay-as-you-go service. No commitment
A visible signature on a document does not guarantee that it is legally valid
Only through a thorough verification process can the authenticity of the signature, the validity of the certificate, its revocation or expiration status, and the integrity of the document be confirmed. The validation process is what allows its reliability to be demonstrated to third parties and legally upheld over time.
Document integrity
Any modification made afterwards, no matter how small, invalidates the signature. Only cryptographic verification of the file hash ensures that the content has not been altered since the moment of signing.
Digital certificate validation
If the certificate is expired, revoked, or was not issued by a recognized certification authority (TSL), the signature has no legal validity. Verifying the origin and status of the certificate is essential to trust the document.
Validity over time
A signature may be valid today but impossible to prove tomorrow. Verification confirms whether the signature includes a timestamp issued by a recognized provider and whether the certificate was valid at the exact moment of signing, ensuring its evidentiary value even after the certificate expires.
Proof for third parties
Without an electronically signed and timestamped evidence report, proving the validity of a signature before auditors, regulators, or courts can be complex. Certification of the verification process provides objective, traceable, and legally robust proof.
What the universal electronically signed document verifier validates
An electronic signature is only reliable when it is technically verified. Verification is the only way to guarantee that a document is intact, authentic, and legally valid.
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Document integrity (hash)
Detects any modification after the time of signing through hash verification.
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Signer certificate validation
Extracts the data from the digital certificate included in the signature and verifies its trust chain.
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Certificate status
Checks the certificate status at the time of signing: valid, expired, or revoked.
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Trust entities and lists
Verifies that the digital certificate was issued by a recognized trusted entity included in an official EU Trusted Service List (TSL) or other accepted countries, as well as by international certification authorities and trusted repositories.
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Timestamp
Determines whether the signature includes a timestamp and validates its temporal consistency. Learn more about timestamps.
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Signature level (according to ETSI standards)
Identifies the signature level (B/T/LT/LTA) and the mechanisms used for long-term validation, as well as whether the signature is qualified, advanced, or simple (eIDAS).
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Long-term validation (LTV)
Ensures that the signature can be verified over time, even after the certificate expires.
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Supported formats (PAdES, XAdES, CAdES, eIDAS)
In addition to validating signatures, it recognizes signed document formats such as digital invoices, checking their compliance with standards such as Facturae or UBL.
Documented verification with legal guarantee
Validating a signature is important. Being able to prove it to third parties is decisive.
An evidence certificate signed and timestamped by Lleida.net (QTSP) documenting the document verification and enabling its legal validity to be demonstrated to third parties.
What it includes, among others:
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Document identification and digital fingerprint (hash).
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Overall result and detailed verification checks performed.
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Digital certificate and signer information.
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Certified date and time through timestamping.
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Electronic signature of the service provider.
Why this report makes the difference:
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Provides valid proof for third parties.
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Ensures traceability and integrity.
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Reduces legal risks and disputes.
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Facilitates audits and compliance processes.
How to use the Universal Signed Documents Verifier
Use the service occasionally or integrate it into your regular processes. Choose the option that best fits your validation volume and automation needs.
Email verification
Validating the electronic signature of a document is as simple as sending the file by email to [email protected].
Within minutes you will receive the verification result along with the evidence certificate, without the need for any technical integrations.
Web backoffice
Manage recurring validations from the web portal, with access to history, report downloads, and usage monitoring.
You can access the user portal at https://usvc.lleida.net/.
Verification API
Integrate electronic signature verification into your systems and automate individual or bulk validations through our free API.
Check our API documentation on this page.
No commitment · Pay-as-you-go · Legally valid evidence
Concerned that a document may have been forged or modified?
Verify the authenticity and integrity of any electronically signed document and obtain an evidentiary report certified by Lleida.net in just a few minutes, with no commitment or prior integration required.
Common use cases of the Universal Signed Documents Verifier
USVC is used across different sectors to verify the validity of critical documents and support compliance and audit processes.
Banking and Fintech
Validate critical financial documentation signed electronically, including:
- Loan and financing agreements
- Account opening and digital onboarding
- Service authorizations and investment agreements
- Contractual and regulatory documentation
Universities and educational institutions
Check the validity of academic and administrative documentation such as:
- Enrollment and admission processes
- Academic certificates and diplomas
- Institutional contracts and agreements
- Documentation related to mobility, internships or employment
Professional associations and advisors
Verify electronically signed documents in processes such as:
- Service contracts
- Reports, authorizations and consents
- Professional certifications
- Regulatory compliance and official submissions
Healthcare
Check the validity of electronically signed clinical and healthcare documentation such as:
- Informed consents
- Medical reports and clinical results
- Health certificates and records
- Administrative and healthcare documentation
Public administration
Verify electronically signed documents in public procedures such as:
- Official certificates
- Powers of representation and deeds
- Administrative documentation
- Electronic declarations and procedures
Telecommunications
Validate electronically signed documentation in operational and regulatory processes including:
- Service contracts
- Agreements with suppliers and partners
- Portability requests and plan changes
- Compliance documentation and regulatory obligations
Pay for what you use
At Lleida.net, we use a flexible credit system that allows you to access most of our services.
= 7 credits
or a signed document validation
Use these credits for whatever you need: send a registered email, sign documents electronically, and much more!
You decide how to spend your credits!
Exclusive offer for new users
To make it easier for you, we've designed an introductory package for only €9,99.
Sign up now and take advantage of this unique offer!
Everything you need to know about electronic signature verification
Does seeing an electronic signature in a document guarantee its legal validity?
No. Simply viewing an electronic signature in a document does not guarantee its legal validity. It does not allow you to verify whether the document has been modified, whether the signer’s certificate was valid at the time of signing, or whether it had been revoked or expired.
How can you know if an electronic signature is valid?
Only a complete technical and legal verification, in accordance with the eIDAS Regulation and ETSI standards, can confirm the authenticity of the signature and the legal validity of the document.
How can you verify an electronically signed document?
The Lleida.net Verifier checks, among other aspects: that the document has not been altered after signing, that the signer’s digital certificate was valid, active and not revoked, that the trust chain is correct and comes from a recognized authority, that the signature complies with the applicable legal and technical standards (PAdES, XAdES, CAdES, eIDAS), and that sufficient evidence exists for its long-term validity (LTV/LTA), where applicable.
Can I verify any type of electronically signed document?
Yes. The service allows you to verify any electronically signed document, including contracts, electronic invoices, academic certificates, administrative documents or healthcare documentation, as long as they contain a valid digital signature.
Which electronic signature formats can be verified?
The service is compatible with the main electronic signature standards: PAdES (PDF), XAdES (XML), CAdES (binary), as well as electronic invoicing formats such as Facturae and UBL.
What does it mean for an electronic signature to be valid long-term (LTV)?
A signature with long-term validation (LTV) includes additional evidence that allows its validity to be verified even after: the signer’s digital certificate has expired or the original validation services are no longer available.
This evidence includes timestamps, revocation data (OCSP/CRL), and certificate chains, in accordance with ETSI long-term signature profiles.
The Universal Signed Documents Verifier checks whether the signature meets these requirements.
Can old electronic signatures be verified?
Yes. An electronic signature may remain valid even years after it was created if it includes long-term validation mechanisms (LTV/LTA).
The service verifies whether the signature includes timestamping and LTV mechanisms that allow its legal validity to be demonstrated even after the certificate has expired.
How is this service different from a basic signature viewer or verifier?
A basic viewer or verifier usually only displays the visual status of the signature.
The Universal Signed Documents Verifier, on the other hand: performs a full legal verification, generates a signed and timestamped evidence report, allows long-term signature validation (LTV/LTA), and provides electronic evidence that can be used before third parties.
Does electronic signature verification have legal validity?
Yes. The result of the verification is documented through an evidence report that: is electronically signed by Lleida.net, includes a qualified timestamp, and constitutes verifiable electronic evidence.
This evidence allows the document’s validity to be demonstrated to third parties such as auditors, regulators, clients or courts.
Are you sure that signed document is valid?
Verify its validity and obtain an evidentiary report in just a few minutes.