What it can do
- Open every common container:
.asice,.sce,.bdoc,.ddoc,.edoc,.adoc,.asics, plus.p7sand.p7m. - Preview documents: PDF, DOCX, XLSX, ODT, images, text, XML, JSON, CSV, audio and video.
- Show signature details: signer, personal code, signing time, time stamp, role, place, certificate issuer and validity, signature level.
- Check integrity: recompute each file's digest and compare it with the signature.
- Open nested containers: a
.ddocinside an.asics, for example, opens with one more click. - Save files: one by one or all together as a ZIP.
What it cannot do
| Task | Why not | Use instead |
|---|---|---|
| Create a signature | Needs your ID-card, Mobile-ID or Smart-ID | DigiDoc4 |
Decrypt a .cdoc file | Needs the recipient's private key on a card | DigiDoc4, Crypto section |
| Give a legally binding verdict | Needs certificate chains, trust lists and revocation checks | DigiDoc4 or a qualified validation service |
| Preview a password-protected PDF | The password is required | Download and open in a PDF reader |
| Edit a document | A viewer only reads | Edit the original and sign again |
Why the validation limit exists
Confirming that a signature is legally valid means checking the signature mathematics, the chain from the signer's certificate to a trusted authority, and proof that the certificate was not revoked at signing time. An online viewer running purely in the browser does not hold the trust lists or contact the authorities' services. ASiCE Viewer says this plainly next to every signature list.
Practical limits
Size is bounded by device memory rather than by a quota. Very old browsers are not supported. The first PDF or Word preview loads a viewer module, so it takes a moment longer than later ones.
A sensible division of labour
Use the online viewer to read and pre-check; use the official client when the answer has consequences. On a phone, the Android app adds offline use and PDF export. The layers of checking are described in ASiC-E signature verification.
Frequently asked questions
Can an online viewer sign a document for me?
No. Signing requires your personal signing device and must be done in signing software.
Does the viewer say if a signature is valid?
It tells you whether the files match the signature and whether the certificate was within its validity period at signing time. It does not issue a legal validity verdict.