Universal workbench

iCalendar to Calendar JSON

Create Calendar JSON from iCalendar locally, with no upload or account.

Device-onlyNo uploads. Ever.

Pipelines, branches, presets, naming, and detailed controls

Display

Text sizeDensity High contrast Monospace editor

Quick start

JSON → YAML WebP → PNG SVG → React JSX Plain text → Base64

From

Help me choose the best output Suggested: Calendar CSV

What matters most?

Recommendations use the registered target format and tested fidelity classification. They never inspect or upload your content.

01Input

Drop files or a folder hereChoose iCalendar files or a folder — batch input is welcome

Choose files Choose folder

or paste content

02Configure & run

iCalendarCalendar JSON

structural conversion · single or batch

Conversion preflightSize, memory, engine, execution, and fidelity before you start

Input: 185 B
Estimated peak memory: 16 MiB
On-demand download: No large engine download
Execution: Responsive local worker
Fidelity: No lossy step declared

What to providePaste iCalendar content or drop a matching file.What you’ll getProduces previewable Calendar JSON text and a correctly named download.

Output naming & batch behavior

Filename templateAvailable variables: {output} (converter’s meaningful name), {name}, {target}, {ext}, {index}. Duplicate names receive a safe numeric suffix.

Exampleoutput.calendar.json

Pipeline 1 linear · 0 branches

Why use A → B → C?

A pipeline feeds each result directly into the next compatible converter. Use one when the destination needs an intermediate representation or when you want to inspect and normalize that middle format.

JSON → CSV → XLSX turns records into rows before building a workbook.
Markdown → HTML → DOCX resolves markup before creating a document.
SVG → PNG → PDF intentionally flattens vector artwork before placing it on a page.

Only type-compatible next steps are offered. Lossy steps are marked before you run them.

1iCalendar to Calendar JSONstructural

Add compatible step

Parallel output branchesEach branch receives the final linear result. Branches do not feed or depend on one another.

Add a parallel destination

Processing happens locally. Your file bytes are never sent anywhere.

About this conversion

How to convert iCalendar to Calendar JSON

Before you start

Paste iCalendar content or drop a matching file.

Accepted: .ics · text/calendar

Paste valid iCalendar content, choose files, or drag them onto the drop zone.
Confirm the detected format. Mixed-format batches are flagged before conversion.
Select “Convert on this device.” Produces previewable Calendar JSON text and a correctly named download.

How this converter behaves

The source records are parsed into a small, typed interchange model and serialized into the destination format with explicit fidelity limits.

What happens to your data?

The conversion engine runs in this browser tab. OmniCastConverter has no upload API and never sends your content, file name, or converted result to a server.

Fidelity and limitations

This route is classified as structural. The converter preserves meaning and structure supported by both formats.

Core event fields are preserved; recurrence rules, alarms, attendees, and time-zone definitions are omitted.

Try a valid example

The “Use example” action in the workbench loads this exact input. Produces previewable Calendar JSON text and a correctly named download.

BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
SUMMARY:Private planning
DTSTART:20260723T090000Z
DTEND:20260723T100000Z
LOCATION:Vilnius
DESCRIPTION:Processed locally
END:VEVENT
END:VCALENDAR