PureCipher Prompt Defender
Review what your browser is about to hand to an AI. Prompt Defender surfaces instructions hidden in web pages, lets you redact sensitive values from a draft, and keeps that work on your device.
Using another browser or platform? Contact us about installation options.
What it does
Review before you share
Select a passage, open a review, and read exactly what will be handed over. Removed lines are listed with a reason, and nothing is sent anywhere until you copy it yourself.
Hidden instructions stripped
Pages can carry instructions aimed at an AI rather than at you. Prompt Defender detects recognised hidden-instruction patterns in page content and removes them, marking where a change was made.
Redact before the prompt
A local workspace for drafts and imported documents. It flags a defined set of credential formats, plus your own saved terms, and replaces them with placeholders before you copy.
Guarded prompt submission
On supported AI sites, a first submission can pause so a suspicious line can be removed and the prompt reviewed, rather than sending it and finding out afterwards.
Documentation and support
Read the privacy policy or visit support. For questions, email support@purecipher.com; send security reports to vamsi@purecipher.com.