Are free image converters safe to use?

Some are, some are not, and the category is too broad to answer in one word. The dangerous ones are sites that hand you a malicious download instead of, or alongside, your converted file. The merely careless ones convert your image correctly but upload it to a server you know nothing about. A converter that runs entirely in your browser avoids both problems, because there is no upload and no file to download from anyone else's server.

Can a converted image file contain a virus?

A genuine JPG, PNG or WebP file is image data, not code, so it cannot run on its own. The real risk is the file you are handed not being an image at all. If a converter returns something ending in .exe, .msi, .scr, .zip or .dmg, or asks you to install a helper app to see your result, that is the attack, not the conversion. Check the extension on every file a converter gives you.

What happens to my photos when I upload them to a converter?

That depends entirely on the site, and its privacy policy is the only thing telling you. Common practice is to hold the file for somewhere between one hour and thirty days before deletion. Some services reserve the right to use uploaded content to improve their product. If the answer matters to you, the reliable fix is not reading policies more carefully, it is using a tool that never uploads the file in the first place.

How can I tell if an image converter uploads my file?

Load the page while online, then disconnect from the internet and try to convert an image. A tool that processes in your browser will still work with no connection. A tool that uploads will fail, because it has nowhere to send the file. This takes about a minute and is the only check that does not require trusting anybody's marketing.

Is it safer to convert images offline?

Yes, in the sense that a file which never leaves your device cannot be retained, leaked or read by anyone. That used to mean installing desktop software. Modern browsers can decode, re-encode and save images without a server, so an in-browser converter gets the same guarantee without an install.

Are free image converters safe?

Some are genuinely dangerous, most are merely careless, and the difference between them is something you can check yourself in about a minute.

By Free Image Lab · July 31, 2026

The short answer

“Free image converter” covers two very different things, and almost every article about their safety treats them as one.

The first kind uploads your image to a server, converts it there, and sends a file back. Whether that is safe depends on who runs the server, what they keep, and whether the thing they send back is really your image. You cannot verify any of that from the outside.

The second kind runs the conversion in your browser, on your own machine. Your file never travels. There is no server to trust, because no server is involved.

Nearly all the published advice about converter safety is written about the first kind. Nearly all of it concludes that you should buy desktop software instead. That conclusion was reasonable when browsers could not do this work. They can now.

What the FBI actually warned about

In March 2025 the FBI’s Denver field office issued a public warning about free online file converters. It was picked up widely, and it is the reason this question started appearing in search results so often.

The detail worth understanding is how those sites work, because it is not what most people assume. They are not broken. They convert the file correctly. You get a working document back, you carry on with your day, and nothing looks wrong. The malicious part rides alongside the legitimate result: a bundled download, a fake “click here to get your file” button that delivers an installer, or a scrape of whatever you uploaded for passwords and recovery phrases.

That is why “it worked fine when I used it” is not evidence of anything. Working correctly is the disguise.

The one check that catches most of it

Look at the extension of the file you are given. An image converter should hand you a file ending in .jpg, .png, .webp or similar. If you are offered an .exe, .msi, .scr or .dmg, or told to install something to view your result, stop. A real image file is data, not a program.

Three different risks, all called “safe”

When people ask whether a converter is safe, they are usually asking one of three separate questions with quite different answers.

1. Will this hurt my computer?: This is the malware question, and it is the rarest but most severe. It comes almost entirely from what you download, not from what you upload. Watch the file extension and refuse every prompt to install anything.
2. Where does my image end up?: This is the privacy question, and it applies to perfectly legitimate services too. Uploading a file means putting a copy on hardware you do not control. Retention windows of an hour to a month are normal, and terms that permit using uploaded content for product improvement are not unusual. Nothing here is an attack. It is simply a copy of your photo in a place you cannot see.
3. Will it quietly ruin the image?: The one almost nobody asks. Plenty of safe, well-meaning converters re-encode more aggressively than they need to, strip your colour profile so the result looks washed out, or hand back a “converted” PNG that is really a JPEG with the extension changed. Your data is fine and your computer is fine. Your image is worse.

Most advice answers only the first. If your images are client work, medical documents, or anything with a face and a location in it, the second matters more.

How to check a converter before you use it

Quick signals, roughly in order of how much they tell you:

Does it say where processing happens? A tool that runs locally will say so plainly, because it is the most useful thing it can tell you. Vagueness here is usually not an accident.
Does it ask you to install anything? Browser extensions for file conversion are a well-documented source of adware. The conversion does not need one.
Does it demand an email address for a single file? A converter that needs to reach you later is a converter that is keeping something.
Does the privacy policy name a retention period? A specific number is a real commitment. “We take your privacy seriously” is not a number.
Is there a person or company behind it? Not proof of anything, but anonymous operators have nothing to lose by behaving badly.

All five are still judgement calls about a stranger. The next one is not.

How to prove a converter never uploads your file

You do not have to take anyone’s word for this, including ours. There is a test that settles it, it needs no technical knowledge, and it takes about a minute.

Open the converter page normally, while you are online.
Turn off your internet. Switch off Wi-Fi, or use aeroplane mode. Do not reload the page.
Now convert an image.

If the conversion completes and you can save the result, the work happened on your device. It could not have been otherwise, because there was nowhere to send the file and nowhere to fetch it back from. If it hangs, errors, or spins forever, your file was going somewhere.

The reason the page must not be reloaded is simply that a reload needs the network to fetch the page itself. The conversion does not.

Run it on us

This test works on our converters and on every other tool on this site. We would rather you checked than believed us.

If you prefer a more direct look, open your browser’s developer tools before converting, switch to the Network tab, and run a conversion. A local tool records no request carrying your image. An uploading tool shows one with your file’s size attached to it.

Where this site sits

Every tool here converts images inside your browser tab. That is not a policy we are promising to keep. It is how the tools are built: the code that opens, decodes, re-encodes and saves your image runs on your machine, and there is no server-side counterpart to send it to.

The practical consequences are worth stating plainly, because they are different from a privacy promise:

Your image is not transmitted, so it cannot be retained, breached or read by us. There is nothing to delete afterwards.
Large files are not slow to upload, because they are not uploaded. Conversion speed depends on your device, not your connection.
There are no file size caps imposed by bandwidth costs, and no queue, because we are not paying to process anything.
It works with no connection at all once the page has loaded.

We do run privacy-respecting analytics on page visits, and we show ads, which is what keeps the tools free. Neither of those touches your images, because your images are never sent anywhere. You can read the specifics on our privacy page.

One honest caveat

In-browser processing protects the file in transit and at rest on someone else’s server. It does not protect you from a compromised device, and it is not a claim that no website can ever collect anything about you. It is a narrower guarantee than “totally private”, and narrower guarantees are the ones worth trusting.

Frequently asked questions

Are free image converters safe to use?: Some are, some are not, and the category is too broad to answer in one word. The dangerous ones are sites that hand you a malicious download instead of, or alongside, your converted file. The merely careless ones convert your image correctly but upload it to a server you know nothing about. A converter that runs entirely in your browser avoids both problems, because there is no upload and no file to download from anyone else's server.
Can a converted image file contain a virus?: A genuine JPG, PNG or WebP file is image data, not code, so it cannot run on its own. The real risk is the file you are handed not being an image at all. If a converter returns something ending in .exe, .msi, .scr, .zip or .dmg, or asks you to install a helper app to see your result, that is the attack, not the conversion. Check the extension on every file a converter gives you.
What happens to my photos when I upload them to a converter?: That depends entirely on the site, and its privacy policy is the only thing telling you. Common practice is to hold the file for somewhere between one hour and thirty days before deletion. Some services reserve the right to use uploaded content to improve their product. If the answer matters to you, the reliable fix is not reading policies more carefully, it is using a tool that never uploads the file in the first place.
How can I tell if an image converter uploads my file?: Load the page while online, then disconnect from the internet and try to convert an image. A tool that processes in your browser will still work with no connection. A tool that uploads will fail, because it has nowhere to send the file. This takes about a minute and is the only check that does not require trusting anybody's marketing.
Is it safer to convert images offline?: Yes, in the sense that a file which never leaves your device cannot be retained, leaked or read by anyone. That used to mean installing desktop software. Modern browsers can decode, re-encode and save images without a server, so an in-browser converter gets the same guarantee without an install.

Tools for this

Free, and everything runs in your browser.

← All guides