Tools / Fun & games
Geo-locked note
Write a note and pick a spot on the map: the link only opens it for someone standing there. A treasure for the kids at home or the farm, a word at a place with a memory, instructions for whoever reaches the land, or a surprise at the end of a trip. The note is encrypted with the place itself, so nobody can read it from afar — not even us.
Your file never leaves your device — everything runs in your browser
Tap the map to set the place
How to use it
- Write the note, plus a title and a hint shown before arrival («a note for you at grandad's house»).
- Pick the place on the map or «my location now», and the opening range (tight ~70 m or wide ~250).
- Share the link or QR. Whoever reaches the place taps «I'm here» and it opens.
Questions
How do you know they really got there?
The note is encrypted with a key derived from the location grid cell; their phone computes its position, derives the same key and decrypts. No server decides — the maths opens it or doesn't.
Why a range?
GPS accuracy runs between 5 and 30 metres, worse indoors. The wide range forgives the error; the tight one is finer for treasures in the yard.
Can someone crack it by trying?
Knowing the general area, a computer could try many cells. It's for fun and surprises, not serious secrets.
Does it work offline?
The page must load once; after that opening needs GPS only. The map for choosing needs internet.
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