Are Translation Browser Extensions Safe? What to Check Before You Install
Before you install any browser extension, it helps to know one thing: to do its job, a translation extension has to read the text on the pages you visit. That is not a red flag by itself; it is simply how on-page translation works. What counts is what the extension does with that access. Here is what a translator can technically see, the risks worth knowing about, and the questions to ask before you trust one.
What a Translation Extension Can See
To translate a comment or a message, an extension reads that text, sends it to a translation service, and puts the result back on the page. Doing that requires permission to read page content. Every legitimate translator needs it, including the ones from large companies. So the permission prompt alone does not tell you whether an extension is safe. What matters is how much it reads, where that data goes, and what it holds on to.
The Risks Worth Knowing About
- Selling browsing data - some free extensions make their money by logging where you go and selling that activity to third parties.
- Reading sensitive fields - page access includes form fields, so a careless extension could pick up passwords, card numbers, or one-time codes.
- Sending everything to a server - some tools transmit far more than the specific text you asked to translate.
- Weak or no encryption - text sent in the clear can be intercepted in transit.
- Over-broad permissions - an extension that asks for more than its job needs is worth a second look.
What to Check Before You Install
- What data actually leaves your device - only the text you translate, or your whole browsing activity?
- Are sensitive fields like passwords, payment inputs, and codes excluded from translation?
- Is your history stored locally, or uploaded to a server by default?
- Is the connection to the translation service encrypted?
- Does the extension ask only for the permissions it genuinely needs?
How Fenly Handles This
These are the answers for Fenly, so you can hold any other extension to the same checklist:
- Sensitive fields are excluded automatically. Fenly uses a sensitive-field detector, similar to how a password manager works, that skips password fields, payment and card inputs (including CVV), phone numbers, email and login fields, one-time codes and PINs, ID and passport fields, and crypto wallet addresses - plus any field inside a login form. That content is never sent for translation.
- Requests are encrypted. Every translation request travels over an encrypted connection.
- Nothing is stored by default. Once a translation comes back to your browser, it is not persisted on the server.
- Your history stays local. Translation history lives in the extension's own storage. Optional cloud sync is off until you turn it on yourself under Settings.
- Only the text you translate is sent. Fenly transmits the specific text being translated, not a log of your browsing.
Translation Without the Trade-Off
A translator earns trust the same way a password manager does: it reads only what it needs and keeps the rest off its servers. You can read the specifics in the Fenly privacy policy before you install anything.
Frequently Asked Questions
Are browser translation extensions safe?
It depends entirely on the extension. To translate text on a page, any translator needs permission to read that page's content, which is normal and necessary. The risk is what an extension does with that access: a trustworthy one only sends the text you translate to its translation service over an encrypted connection and excludes sensitive fields; a bad one can harvest browsing data or read login and payment fields. Check the permissions, the privacy policy, and whether sensitive fields are excluded before installing.
Can a translation extension read my passwords?
A poorly built extension technically could, because page access includes form fields. A well-built one specifically excludes them. Fenly uses a sensitive-field detector, similar to how password managers work, that skips password fields, payment and card inputs, phone numbers, email and login fields, one-time codes, and any field inside a login form, so that content is never sent for translation.
Does Fenly store my translations?
By default, no. Every translation request is sent over an encrypted connection, and nothing is persisted on the server once the translation is returned to your browser. Your translation history lives locally in the extension's own storage. Optional server-side cloud sync is off by default - you turn it on yourself under Settings if you want history across devices.
Do translation extensions sell your data?
Some free extensions monetize by collecting and selling browsing data - this is the main reason to check an extension's privacy policy and permissions before installing. A translator should only transmit the specific text you choose to translate, not log your full browsing activity. Fenly does not sell browsing data; it sends only the text being translated and keeps history local by default.
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