By Manuj Mehta · Updated
To keep a private diary on your phone, use a diary app that locks each diary with its own PIN, stores your entries on your device rather than on the app maker's servers, and only backs up to an account you own. Then you can write honestly, knowing nobody else can open it.
Why privacy matters for journaling
The value of a diary comes from honesty, and you can't be honest if you're wondering who might read it. People who worry their diary could be found tend to write less, soften what they write, or stop entirely. A private diary removes that worry — we explore the idea further in The Private Workshop.
What to check in a private diary app
- A lock per diary, not just for the whole app — so you can share your phone or a grocery list without exposing your journal.
- Where entries are stored. On your device is the most private option.
- Who holds the backup. Your own cloud account (like Google Drive) is better than the app maker's server.
- No ads, no tracking of your writing. Your entries shouldn't be anyone's product.
- Export. You should be able to take your diary with you, for example as a PDF.
How to set up a private diary in Penso Notes
- Create a diary for the part of your life you want to keep private.
- Open the diary's settings and choose Lock this diary.
- Set a PIN. The diary will ask for it every time it opens; your other diaries stay unlocked.
- Decide on backup: leave it off, or link your own Google Drive under Backup Settings.
- Start writing — one line is enough.
Private diary vs notes app with a password
Many notes apps can lock individual notes, but a diary is a collection you return to every day. Locking the whole diary means one PIN protects every past and future entry, while your everyday notes stay quick to open. Read more about how Penso handles this on the privacy & lock page.
Habits that keep a diary private
- Use a PIN that's different from your phone's unlock code.
- Turn on your phone's own screen lock.
- Keep backups in an account only you can access.
- Avoid writing passwords or bank details in any diary, locked or not.
Frequently asked questions
Can I lock a diary on my phone?
Yes. Diary apps like Penso Notes let you lock an individual diary with its own PIN, so it asks for the PIN every time it opens while your other diaries stay accessible.
Where are my Penso Notes entries stored?
Entries are stored on your device. The only cloud copy is an optional backup to your own Google Drive, which you can turn on or leave off.
Is a diary app safer than a paper diary?
A locked diary app with on-device storage and your own backup can be harder to read and easier to recover than a paper diary, which can be found, lost or damaged. Both are private only if you protect them.