Is It Safe to Use Online File Converters? What the FBI Says

The FBI Warning

In March 2025, the FBI Denver field office published a warning that agents were seeing an increase in scam websites disguised as free online file conversion tools. These sites appeared to perform legitimate conversions—turning a .doc file into a .pdf, for example, or converting an image format—but were simultaneously doing something far more dangerous behind the scenes.

According to the FBI, these malicious converters were being used to:

• Install malware on the user's computer, including ransomware that locks files until a payment is made.
• Harvest personal information from uploaded files, including Social Security numbers, banking details, passwords, email addresses, and cryptocurrency wallet seeds.
• Scrape metadata from documents and images, extracting GPS coordinates, device information, and other embedded data that users did not realize they were sharing.

The converted file you download might work perfectly fine, which is what makes these scams so effective. The user gets their converted file and walks away satisfied, never realizing their data was compromised in the process.

How These Attacks Work

Traditional online file converters follow a simple flow: you upload a file to a remote server, the server processes it, and you download the result. This model has an inherent security problem: your file exists on someone else's server, and you have no control over what happens to it there.

Malicious actors exploit this in several ways:

• Data extraction during processing: While your file is on their server, automated tools parse its contents. A PDF resume might contain your name, address, phone number, and employment history. A photo might contain GPS metadata showing your home location.
• Modified output files: The converted file returned to you may contain embedded malware, malicious scripts, or altered content. A seemingly innocent PDF could contain code that executes when opened.
• File retention: Even legitimate-looking converters may retain copies of your uploaded files indefinitely. Their privacy policy might technically allow this, buried in terms of service that nobody reads.

How to Tell If a Converter Is Safe

Not all online converters are malicious. Here are the key factors to evaluate before trusting any conversion tool with your files:

1. Check Where the Processing Happens

This is the single most important factor. If a converter uploads your file to a remote server for processing, your data leaves your control the moment you click "convert." Look for tools that process files entirely in your browser using client-side JavaScript. With client-side processing, your files never leave your device. There is nothing to intercept, no server to breach, and no copy to retain.

2. Look at Network Activity

If you are technically inclined, open your browser's developer tools (F12) and watch the Network tab during a conversion. A truly client-side converter will show no file uploads to external servers. If you see large POST requests going to an API endpoint, your file is being uploaded somewhere.

3. Evaluate the Business Model

Ask yourself how the service makes money. If a converter is free, has no ads, and collects no data, it might be open source or supported by donations. If it is free with no obvious revenue source, be cautious — you might be the product.

4. Check for HTTPS

Any legitimate tool should use HTTPS. While this does not guarantee safety (a malicious site can have an SSL certificate), the absence of HTTPS is an immediate red flag.

5. Read the Privacy Policy

Look for clear statements about data handling. A trustworthy converter will explicitly state whether files are uploaded to servers, how long they are retained, and who has access. Vague or missing privacy policies are a warning sign.

What to Do If You Have Used a Suspicious Converter

If you think you may have used a malicious file converter, the FBI recommends taking these steps:

1. Run a full antivirus scan on your device using up-to-date security software.
2. Monitor your financial accounts for unauthorized activity, especially if the files you converted contained any personal or financial information.
3. Change your passwords if any converted documents contained login credentials or other sensitive data.
4. Report the incident to the FBI's Internet Crime Complaint Center (IC3) at ic3.gov.

The Safer Approach: Client-Side Processing

The architecture of a file converter determines its risk profile. When a converter runs entirely in your browser, the security model is fundamentally different from server-based tools:

• No upload means no interception: Your file never travels over the internet, so there is nothing for attackers to intercept, even on public Wi-Fi.
• No server means no breach: If there is no server storing your files, there is nothing to hack. Data breaches cannot expose files that were never collected.
• No retention means no risk: Once you close the browser tab, the conversion data is gone. There is no database of user files sitting on a server somewhere.

This is not a theoretical distinction. It is the difference between handing your document to a stranger in a back room and making a photocopy on your own machine at home.

The Bottom Line

The FBI's warning is a reminder that convenience should not come at the cost of security. Online file converters can be safe, but only if they are built with the right architecture. Before using any converter, check whether your files are being uploaded to a server or processed locally in your browser. That single distinction is the difference between a tool you can trust and one that might compromise your data.

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