On-device vs cloud anonymization: the difference
With on-device anonymization, the document content never leaves your machine. Cloud services still transmit the data to someone else's server, even when hosted in Germany.
Updated
The decisive difference is simple: with on-device anonymization, the document content never leaves your machine. A cloud service, by contrast, transmits the data to someone else’s server, even if that server sits in Germany. Only the local approach avoids the transfer to a third party entirely.
What “cloud-based” means in practice
Many anonymization services advertise “GDPR-compliant” or “hosted in Germany.” That is better than a US server, but it does not change the basic principle: to process your document, the service has to receive it. At that moment the content leaves your building and is processed at another vendor. That is typically an additional processing arrangement you have to document and secure.
What “on-device” means
With a local, on-device tool, all detection and anonymization runs on your own computer. There is no upload of the document content. You can even verify this yourself by watching the network traffic. No additional transfer is created, because nothing is transmitted.
At a glance
| Criterion | On-device (Stript) | Cloud / hosted |
|---|---|---|
| Content leaves the device | Never | Yes, for processing |
| Processing at a third party | No | Yes |
| Verifiable yourself | Yes, via network traffic | No |
| Works offline | Yes | No |
| Depends on a server operator | No | Yes |
What about detection quality?
A common objection is that local models are weaker. For anonymization that is not the deciding factor, because a human confirms the results. What matters more is context-aware detection: not every detected name is personal data (public bodies, courts, cities), and not every piece of personal data is a proper name. Stript judges the context of each match, and does so entirely on your device.
Bottom line
If the goal is that data does not leave the building, the local approach is the only one that keeps that promise technically. Cloud-based anonymization only shifts the trust problem to another vendor.
Anonymize locally, without data leaving your device. Download Stript for free →