JSON Size Calculator
Compute JSON size (original vs minified) and the savings. Enter your values, click Calculate, and get the full result with its breakdown — everything is processed on your device, nothing is sent to a server.
All calculations run in your browser. Your data is never sent to our servers.
Example
Example Input
{ "a": 1, "b": 2 }Example Output
18 bytes → 13 minified
How to Use
- 1Fill in each input field with the values you want to compute.
- 2If there are choices (units, mode, operation), pick what you need.
- 3Click the Calculate button (or press Ctrl+Enter).
- 4The main result and its breakdown appear in the Result area. Click Copy to copy it.
About the JSON Size Calculator
The JSON Size Calculator measures the byte size of your JSON — original and minified — plus the savings percentage. Useful for estimating API payloads, response sizes, and the impact of minification.
The JSON is validated first; invalid input is flagged.
FAQ
Is this JSON Size Calculator accurate?
Yes. It uses standard formulas and runs directly in your browser at full JavaScript precision (plus BigInt/decimal.js for large numbers where needed).
Is my data sent to a server?
No. All calculations happen entirely on your device. No values are sent to or stored on our servers.