Blazelock's free online virus scanner

Cyber threats are becoming increasingly varied. An invoice attached to an email, a downloaded program or a ZIP archive from a new contact could contain malware. Blazelock's free online virus scanner lets you check these files before opening them.

Choose a file and Blazelock automatically checks it for viruses and other malware. You don't need an account or any additional software. The tool runs in your browser and works for individual file checks at home or at work. It supports all file formats, up to 100 MB per file.

How the scan works

1. Open the online virus scanner and drag your file into the upload area. You can also click "Select file".
2. The upload and scan start automatically. Keep the page open while Blazelock checks your file.
3. After a few seconds, the result appears with an assessment of your file and details of the scan.

There's no need to configure scan settings or start the scan separately. Once you've selected a file, Blazelock takes care of the rest.

Scan your file for viruses for free

Understanding the result

The result shows whether Blazelock detected a threat or a potential security risk. The screenshot below shows a PDF scan with no threats detected.

A result with no threats detected means the scan found no malware. Since no virus scanner can guarantee complete safety, consider where the file came from as well. Check whether you trust the sender and were expecting the file.

If Blazelock identifies a potential security risk, it displays a warning, for example about macros in a document. These warnings help you assess the contents before opening the file.

If the scanner detects malware, don't open or run the file. Review the findings and delete the file if you don't need it. If you've already opened or run it, check your device with up-to-date antivirus software. The online virus scanner checks the uploaded file, not your entire device.

What the online virus scanner offers

Scan engines from leading providers

Blazelock uses selected scan engines from leading providers. Our Security Lab tests how well they detect known threats and threats currently in circulation. We also check how often the engines raise false alarms and assess their performance and stability.

Processing in the EU

Your file is processed on our own scanning infrastructure in Frankfurt am Main, Germany. It stays within that infrastructure and is deleted once the scan is complete. Neither Blazelock nor the engine providers use your file for testing or training.

Our security and privacy page explains how we select scan engines, run our infrastructure and protect your data.

Free, with no installation required

You can use the tool directly in your browser without signing up. That's useful when you need to check individual files from time to time. You don't have to install software or create an account first.

When to check a file

Scanning an email attachment can help you assess it before opening it. It might be an unexpected invoice or a document from someone you don't know yet. Save the attachment to your device, then upload the file to the online virus scanner. The scanner can check the document without you having to open it first.

You can also check a downloaded program before installing it, or scan an archive before extracting its contents. Along with programs and archives, the tool supports documents, images and all other file formats, as long as each file is no larger than 100 MB.

At work, you might use the scanner to check a file received through a support request or from an external project partner. Staff can check individual files before opening them or sharing them within the team.

Scan files automatically in your application

If you regularly need to check uploads in an application, you can automate the process with Blazelock's Malware Scanning API. Send a file to Blazelock through the API and receive a structured result that you can process in your application.

We run and maintain the scanners, so you don't need to build your own scanning infrastructure.