PaperKit Privacy Policy
Last updated 19 October 2026
PaperKit is an Android app for filling, signing and organising PDF documents. This policy explains what information PaperKit collects, why, how long it is kept and the choices you have. Most of what you do in PaperKit never leaves your phone.
What stays on your phone
- Your documents. PDFs you open or import are copied into the app's private storage on your phone. They are not uploaded, except a single page when you use smart fill (below).
- Your details and signatures. The autofill details you enter (such as your name, date of birth, address, phone, email and ID number) and your saved signatures are stored encrypted on your phone. They are never sent to us. Smart fill fills them in on the phone.
What we collect
| Information | Why | How long |
|---|---|---|
| Account identifier. When you first use features that need the internet, the app creates an anonymous account with a random user ID. No name or email is needed. | To apply fair-use limits and keep your smart fill requests separate from other people's. | Until you delete your account. Unused anonymous accounts are deleted after 30 days. |
| Google account details. If you choose to sign in with Google, we receive your email address, name and profile picture from Google. | To sign you in and give signed-in users higher limits. | Until you delete your account. |
| The page you send to smart fill. When you tap Smart fill, the one page you are filling is uploaded (not the rest of the document, and never your details). | To find the blank fields on the page and work out what each one asks for. | The page is deleted as soon as it has been processed, and within 1 hour at most. The list of fields found is kept for 24 hours so the same page can be answered again quickly, then deleted. |
| IP address. | To limit how many requests can be made from one network, which prevents abuse. | Request counts are deleted after 2 days. Our hosting providers may keep standard request logs for a short time. |
We do not collect your location, contacts, files other than the page you send to smart fill, or device advertising IDs. PaperKit has no ads and no analytics or tracking SDKs. We do not sell your information or use it for advertising.
Who processes your information
We use these service providers to run PaperKit. They process information only to provide their service to us:
- Supabase: sign-in and the database that briefly holds smart fill requests (servers in Singapore).
- Vercel: hosts the smart fill API (servers in Singapore).
- Google: only if you choose to sign in with Google.
- An AI model provider (currently accessed through OpenCode Go): receives an image of the page you send to smart fill, with the blank fields marked, and returns what each field asks for. It does not receive your details or your account information.
The smart fill processing itself runs on a server we operate. Information may be processed outside your country.
Security
Information is sent over encrypted connections (HTTPS). Your details and signatures are stored in your phone's encrypted keystore. Smart fill pages and results can only be read by the account that sent them.
Your choices
- Use PaperKit without smart fill. Viewing, filling, signing and page tools work without sending anything to us.
- Sign out at any time from Signatures & details → Account. You carry on as a guest.
- Delete your account and data. In the app, open Signatures & details → Account → Delete account. This deletes your account and any smart fill data on our servers straight away; your documents, details and signatures on your phone are not affected (see Delete your PaperKit account). If you no longer have the app, email paperkitapp@gmail.com with the subject "Delete my account" from the Google account you signed in with, and we will delete your account and data within 30 days.
- Access or correct your information. Email us to ask what information we hold about you or to correct it.
Children
PaperKit is not directed at children under 13, and we do not knowingly collect information from them.
Changes
If we change this policy, we will update the date above and, for significant changes, tell you in the app.
Contact
Questions or requests: paperkitapp@gmail.com