# Online ASiC-E File Viewer: what it can and cannot do

> An online ASiC-E file viewer is convenient, and it has clear edges. Knowing where they are saves time and avoids relying on a check that was never made.

Source: https://asiceviewer.com/en/blog/online-asice-file-viewer/
Published: 2026-11-10 · Digixy

## In short

- It can: open containers, preview documents, show signer details, check integrity.
- It cannot: sign, decrypt `.cdoc` files, or issue a legally binding validation.
- For those three tasks use the official DigiDoc4 client.

## What it can do

- **Open every common container:** `.asice`, `.sce`, `.bdoc`, `.ddoc`, `.edoc`, `.adoc`, `.asics`, plus `.p7s` and `.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 `.ddoc` inside 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](https://asiceviewer.com/en/#tool) 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](https://play.google.com/store/apps/details?id=com.digixy.asiceviewer&hl=en&referrer=utm_source%3Dasiceviewer.com%26utm_medium%3Dblog-md) adds offline use and PDF export. The layers of checking are described in [ASiC-E signature verification](https://asiceviewer.com/en/blog/asice-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.

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Open your .asice file now: https://asiceviewer.com/en/
ASiC-E Viewer on Google Play: https://play.google.com/store/apps/details?id=com.digixy.asiceviewer