OpenNestJSON to ICS Converter
Convert JSON to iCal Calendar directly in your browser. Your files never leave your device — no uploads, no account, no tracking.
Choose files
or drag & drop here
100% local — your file never leaves this device.
How to convert JSON to ICS
Choose your JSON file
Select a JSON from your device — click or drag & drop.
Pick ICS as the output
We auto-detect your file and show ICS as a recommended target.
Convert & download
Everything runs locally in your browser, then you download the result instantly.
Why use OpenNest to convert JSON to ICS?
100% local
Your JSON file is converted entirely in your browser — nothing is uploaded.
Free & no account
No signup, no limits. Convert as many files as you need, on any device.
Private by design
No servers, no tracking, no logs. Close the tab and every trace is gone.
Supported input & output
| Input — JSON | .json · application/json |
|---|---|
| Output — iCal Calendar | .ics · text/calendar |
FAQ — JSON to ICS
Is JSON to ICS conversion free?
Yes — completely free, no account, no signup, and no file limits.
Do I need to upload my JSON file?
No. The conversion runs entirely in your browser; your file never leaves your device.
How do I convert JSON to ICS?
Select your JSON file, choose ICS as the target, and click Convert. The result downloads instantly.
Is the output quality preserved?
Conversion is done locally with high-quality output, preserved to the extent the target format allows.