When you tap "Detect my pincode", your browser asks for permission and then hands the site a pair of coordinates. Where those coordinates come from — and how accurate they are — depends on your device and where you are standing. Knowing this helps you judge whether to trust the result.
The four ways a device finds itself
Satellite GPS
Phones with satellite positioning (GPS, plus systems such as India’s NavIC on supported phones) can work out their position from satellite signals. Outdoors with a clear view of the sky, this is usually accurate to within a few metres to a few tens of metres. Laptops and most desktops do not have GPS.
Wi-Fi positioning
Your device can compare nearby Wi-Fi networks against a database of where those networks have been seen before. In cities this works well indoors and is often accurate to tens of metres. In areas with few networks it is much weaker.
Mobile towers
Without GPS or Wi-Fi, a phone can estimate its position from the mobile towers it can hear. Accuracy ranges from a few hundred metres in a city to several kilometres in the countryside.
IP address
A desktop on a wired connection may only be able to guess from its internet address. That can be off by tens of kilometres, sometimes placing you in the city where your internet provider’s equipment sits.
What that means for your PIN code
A PIN code area in a city is often a few square kilometres; in rural areas it is much bigger. So a position that is a few tens of metres off almost always gives the right code. A position that is a few hundred metres off is usually still fine — unless you are close to the boundary between two delivery areas. An IP-based guess is not good enough for a PIN code at all.
- Outdoors on a phone: trust the result.
- Indoors on a phone: usually right; step near a window if it looks off.
- On a laptop or desktop: check the area shown against your actual locality.
- Near the edge of a city, a cantonment or an industrial estate: cross-check against your address.
How this site uses your location
Your coordinates are sent once to our server, matched to an address and PIN code, and then discarded — they are not stored or linked to you. The result also lists nearby post offices from India Post’s directory, which helps if you are close to a boundary. The privacy policy has the details. You can always skip detection and search by place name instead.
When detection gets it wrong
If the PIN code looks wrong, first check the locality shown with it. If the locality is wrong too, your device’s position was off: turn on precise location in your phone settings, move outdoors, and try again. If the locality is right but the code looks unfamiliar, look the locality up in the directory and see which nearby codes exist. Our guide to the four ways to find your PIN code covers the alternatives.
Browsers only share location after you allow it, and you can withdraw that permission at any time in your browser’s site settings.
FAQ
Does detection work without mobile data?
Satellite positioning itself works offline, but the site needs an internet connection to turn your coordinates into a PIN code. With a weak connection, the detection may time out; try again or search by place name.
Why does my laptop show a different city?
Laptops without GPS often fall back to Wi-Fi or IP-based location. If your Wi-Fi network is not in the location database, the IP guess can point to your internet provider’s city. Use your phone or search by locality instead.