# Open an ASiC-E file in 30 seconds

> You have an `.asice` file and you want to read it now. This is the shortest route, with a checklist of what to look at once it is open.

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

## In short

- Go to [asiceviewer.com](https://asiceviewer.com/en/#tool) and drop the file onto the page.
- Check three things: the documents, the signers and the integrity line.
- Nothing is installed and nothing is uploaded.

## Three steps

1. **Save the file.** If it arrived by e-mail, download the attachment first.
2. **Drop it onto the page.** Open [asiceviewer.com](https://asiceviewer.com/en/#tool) and drag the file into the box, or tap the box and choose it.
3. **Read.** The first document opens automatically.

That is all. On an ordinary connection the page is ready in about a second, and the container is unpacked on your own device.

## What to check once it is open

- **Is it the document you expected?** Read the title and the first page.
- **Who signed?** Each signer has a card with name and signing time. If you expected two signatures and see one, the other party has not signed yet.
- **Does the integrity line say OK?** That means the files match the digests in the signatures.
- **Are there attachments?** A container can hold several files. Look at the whole list, not only the first one.

## If it does not open

| Symptom | Likely cause | Fix |
| "The file could not be opened" | Download was interrupted | Download the attachment again |
| Only a hex view appears | The file is not a container | Check the extension and the sender |
| The file ends in `.cdoc` | It is encrypted, not signed | Decrypt it in DigiDoc4 with your ID-card |
| The file ends in `.zip` | A mail server renamed it | Drop it in anyway; the content is recognised |

## Need more than a quick look?

For an official statement on validity, open the same file in DigiDoc4. For reading on a phone without a connection, the [ASiC-E Viewer app](https://play.google.com/store/apps/details?id=com.digixy.asiceviewer&hl=en&referrer=utm_source%3Dasiceviewer.com%26utm_medium%3Dblog-md) keeps working offline. The longer walkthrough is in [how to open an ASiC-E file](https://asiceviewer.com/en/blog/how-to-open-an-asice-file/).

## Frequently asked questions

**Do I need an ID-card to open an ASiC-E file?**

No. An ID-card, Mobile-ID or Smart-ID is only needed to create a signature. Reading a signed file needs none of them.

**Can I open several files at once?**

Yes. Select or drop several files and they appear in one list, each with its own preview.

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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