> For the complete documentation index, see [llms.txt](https://bluurdoc.bluur.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bluurdoc.bluur.ai/en/getting-started/quick-start/document-anonymization.md).

# Document anonymization

{% stepper %}
{% step %}

### Adding a document

To get started, add a document to the system. You can do this from [**Quick anonymization**](broken://pages/0c28754767bf79c3edf81e783574911e361b6976) on the dashboard or from the selected [**project.**](/en/functions/projects.md) Select a file from your disk or drag it into the document upload field. After adding the file, the system will begin processing it.

{% hint style="info" %}
Supported file formats are: **PDF, JPG, JPEG, JPE, JIF, JFIF, JFI, PNG, TIFF and TIF**.

The maximum size of a single document is **10 MB**. When adding multiple documents to a project, their total size cannot exceed **100 MB**.
{% endhint %}

<figure><img src="/files/be12e739fc3756a88f79c601f7c0cac8ee4bb514" alt="Panel Bluur z przyciskiem dodawania dokumentu i opcją Szybka anonimizacja"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Automatic classification

After uploading the document, Bluur automatically begins data classification.

The system analyzes the document and marks elements that may require protection, such as personal data, contact data, financial data, address data, signatures, identification numbers, and other confidential information.

{% hint style="info" %}
Classification time depends on the size of the document and the number of areas containing data that need to be recognized. The analysis progress is visible on the loading bar. For documents containing around 1000 such fields, classification usually takes no longer than 30 seconds.
{% endhint %}

<figure><img src="/files/371f612fa64065bb896eae37b8888e2f37afcbd4" alt="Okno wyboru pliku do wgrania w Bluur"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Field verification

After classification is complete, a document view with marked fields will open.

Before anonymization, check whether the system has correctly recognized the data requiring protection. If necessary, you can delete an incorrectly detected field, move it, or change its size.

**Delete the field** – hover over the marking and press **Delete**.\
**Move the field** – left-click the field and drag it to another place.\
**Resize the field** – drag the square on the edge of the marking.

A detailed description of working with detected fields can be found in the section [**AI classification**.](/en/functions/working-with-a-document/stages/ai-classification.md)

<figure><img src="/files/998bc709d048eef08e71e56a63fe11e32a0b932e" alt="Pasek postępu automatycznej anonimizacji dokumentu przez AI"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Proceed to anonymization

After checking the fields, proceed to the **Anonymization**.

You can do this from the top bar of the document view, the menu on the left, or by using the button **Select fields**.

<figure><img src="/files/bfeb5e6a34e161fd6a868d671b091f02ac2602d5" alt="Dokument z automatycznie oznaczonymi polami zawierającymi dane wrażliwe"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Data selection&#x20;

At the anonymization stage, the user can decide which categories of data should be hidden in the document.

This is done using the sliders visible next to individual data categories. If a category is turned off, the fields assigned to that category will not be anonymized.

If you want to hide an additional fragment of the document that was not marked by the system, you can manually select your own area for anonymization.

<figure><img src="/files/225de926ab1a5b346cf596efdee9858ba1c95e17" alt="Suwak umożliwiający wyłączenie wybranego obszaru z anonimizacji"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Perform anonymization

To perform anonymization, click the **Anonymize**.

The system will overlay black boxes on all active areas selected for anonymization. This means that fields detected by the system and additional areas marked manually by the user will be hidden.

{% hint style="warning" %}
At this stage, the user can undo saved changes in the system and restore the document to the classification stage. The ability to undo changes does not apply to downloaded files. In the anonymized output file, anonymization is always irreversible.
{% endhint %}

<figure><img src="/files/b9241fa652f955b130c23ac1156c8ef45aaf898b" alt="Podgląd dokumentu z aktywnymi obszarami przeznaczonymi do anonimizacji"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Downloading a document

After anonymization is complete, download the finished file.

The anonymized document does not overwrite the original file on the user's disk. The user downloads it as a new file with the suffix **\_redacted\_data** and the anonymization date. E.g., contract\_redacted\_data\_2026\_03\_31.pdf.

<figure><img src="/files/3c7f8c79467158d79d9e61721e3bc7081e6d7ca1" alt="Zanonimizowany dokument z zaczernionymi/zamazanymi danymi wrażliwymi"><figcaption></figcaption></figure>

<figure><img src="/files/0a634e707374323379890b357a5fac8da0c8dbf6" alt=""><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Document archiving

After anonymization, you can archive the document.

Archiving removes the original source document from the system. Only the anonymized version of the document remains in the system.

More information about storing and deleting documents can be found in the section [**Document retention**.](/en/functions/settings/anonymization/retention.md)

{% hint style="warning" %}
After archiving the document, it is no longer possible to return to editing it in the system. Before archiving, make sure you have the original file on your disk if you may need future access to the data removed as a result of anonymization.
{% endhint %}

<figure><img src="/files/e98afdd0c191c8d676ad507f680df8f46036b6ac" alt="Przycisk archiwizacji zanonimizowanego dokumentu w Bluur"><figcaption></figcaption></figure>
{% endstep %}
{% endstepper %}

### Summary

To anonymize your first document, add a file to the system, check the AI classification results, proceed to the anonymization stage, choose the scope of data to hide, and click **Anonymize**. After the process is complete, download the finished anonymized version of the document.


---

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## Querying This Documentation
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```
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```

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