Opening OA Files

The OA file type is primarily associated with OpenAttestation Viewer.

OA	File extension: OA
	File type:	document

What is an OA file?

OA files mostly belong to OpenAttestation Viewer.

This file is an OpenAttestation document. Its internal format is JSON, which makes it a text-based file storing attestation data. This OA file holds information that verifies the authenticity and integrity of a document.

You can view this file using the OpenAttestation Viewer. Here are some key points summarized by FilExt.com:

Format: It is a JSON file.

Usage: It stores digital attestation data.

Access: Use a JSON viewer or the dedicated OpenAttestation Viewer to examine its contents.

FilExt.com note: For more details, visit the OpenAttestation website.

How to open an OA file

You need a suitable software like OpenAttestation Viewer to open an OA file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your OA file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a OA file directly in the browser:. Just drag the file onto this browser window and drop it.

Online OA Text Viewer

Choose your .oa file to view

or drag and drop it here

Online File Viewer

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How to extract texts from OA files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

If you want to extract texts from OA file or capture a screenshot, you can use our free Online OA File Viewer:

Just click the "Choose your .oa file to view" button on this page.
Your OA file will then be displayed in the browser.
Now click on "Save as..." at the top of the page.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Your file will be converted and downloaded.

Programs that open and convert OA files:

OpenAttestation Viewer
See the previous paragraphs to learn more about the main application. OA files are often referred to as OpenAttestation Viewer data files because this type of file is primarily created or used by this software.
OpenAttestation Viewer
OpenAttestation files, denoted by the *.oa extension, primarily store verifiable documents, such as certificates and diplomas, using a JSON format. These documents are digitally signed and can be independently verified for authenticity and integrity. They are commonly used for issuing and managing digital credentials in various contexts, including education, professional certifications, and identity verification. This file format is classified as Document.

OA file format:

To view or edit OA files you need to know the file format, because it determines how the data in this file is stored. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. So you need a detailed analysis of a file to find out the format and the associated program. Our evaluation of the OA files is as follows:

The OA file extension is not widely used. Such a file is primarily used by a single program. However, the following two file formats are common:

80% of all OA files are based on the popular JSON file format. JSON (JavaScript Object Notation) is a lightweight data−interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. These files contain text and words, not binary data. The file size is in the range of 2 KB to 35 KB. This file type is new and state-of-the-art. The following keywords are characteristic: data, https://schema.openattestation.com/2.0/schema.json, name, string, version and template. A common filename is VaccinationHealthCert.oa. Files like these are about ltvp, card and hora, and frequently comprise personal data.
15% of all OA files have the same signature gE#. These files are binary files, so they do not contain text, but only cryptic characters. OA files can be up to 67 KB in size, but are often around 19 KB - 48 KB. A usual file name is sch.oa or layout.oa. Files like these are sometimes connected to symbol.

The remaining 5% of all OA files are different files with different signatures. These files are often connected to symbol. Drag & drop your file here to see the file format and a preview of your OA file!

Technical Data for OA File Extension

File classification:

Data

Related files:

crt, cert, ao, json, pdf, xml, txt

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: NeroPhotoSnapViewer.Files
EXEFile: %ProgramFiles%\Ahead\Nero PhotoSnap\PhotoSnapViewer.exe %1

an oa document is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with OA files

Associate the OA file extension with the correct application.
Update your software that should actually open documents. Because only the current version supports the latest OA file format. Search, therefore, e.g. on the manufacturer website after an available OpenAttestation Viewer update.
To make sure that your OA file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .OA file online - secure, fast, and no downloads needed.