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Qlex Privacy Policy

Updated: 2026-11-07

Qlex is an offline on-screen translator for Windows and Linux by Zentline. This policy explains what data the Qlex program handles and where it goes. The Zentline website has its own privacy policy.

Summary

Qlex does not collect personal data, does not track you and has no ads. Screenshots, recognized text and translations never leave your computer. Qlex sends only anonymous usage statistics, which you can turn off.

What stays on your computer

  • Screen captures and recognized text. When you press a Qlex hotkey, Qlex captures the selected area of the screen (or a strip around the mouse cursor) and recognizes the text in it. Recognition, translation and dictionary lookups run on your computer. The captured image is kept in memory only while it is processed; it is saved to disk only if you turn on debug mode yourself.
  • Selected text. When text is selected in another program, Qlex copies it through the clipboard to translate it and restores the clipboard afterwards.
  • Saved words, settings and the Qlex Pro license key are stored in the Qlex data folder on your computer. You can export or delete your saved words in the program. Uninstalling Qlex installed from the Microsoft Store removes this folder.

When Qlex connects to the internet

Qlex works offline. It connects to the internet only in these cases:

  • Downloading languages. When you choose a language that is not built in, Qlex downloads the language package from Hugging Face (huggingface.co) or, if it is unavailable, from Cloudflare R2 (qlex-packages.zentline.com). These services see your IP address and the files requested, like any website. Qlex sends no other information.
  • Qlex Pro license. If you enter a Qlex Pro license key, Qlex sends the key and a device label (“Qlex” and your computer name) to Lemon Squeezy (api.lemonsqueezy.com) to activate it, and then checks the key about once a day (subscription) or once a week (lifetime). This is used only to verify the license and to limit the number of computers per key. You can deactivate the computer in the Qlex Pro window.
  • Buying Qlex Pro. The “Buy” button opens the Lemon Squeezy checkout page in your web browser. Payment is handled by Lemon Squeezy, the merchant of record; Qlex never sees your payment details. Lemon Squeezy's privacy policy: https://www.lemonsqueezy.com/privacy
  • Usage statistics. Once a day Qlex sends an anonymous summary of how it was used — see “Anonymous usage statistics” below.

Without Qlex Pro, the free daily limit is counted on your computer; nothing is sent.

Anonymous usage statistics

To understand which features are used, Qlex sends a short anonymous summary once a day to Aptabase (aptabase.com, servers in the European Union). It contains only:

  • the Qlex version, the operating system and its version, the interface language;
  • the translation languages and whether Qlex Pro is used;
  • how many times each kind of translation was used that day, how many translations were shown, how many times the free limit was reached and how many errors occurred.

The summary contains no identifier of you, your computer or the installation, no screenshots or text, no saved words, no computer name and no license key. Aptabase, like any website, sees the IP address of the request.

You can turn the statistics off in Settings → “Send anonymous usage statistics”; collected data that has not been sent yet is then deleted.

Third parties

Zentline receives no personal data from the Qlex program — only the anonymous daily statistics described above. Data is shared only with the services listed above, and only for the purposes described. Qlex does not sell data.

Children

Qlex does not knowingly collect any information from children or anyone else.

Changes

If this policy changes, the new version will be published on this page with a new date.

Contact

Questions about privacy: support@zentline.com