# ICS Viewer

> Free online ICS file viewer and iCalendar tool. Open, parse, and visualize .ics calendar files instantly in your browser — no account, no install required. Supports month, week, day, agenda, and year views; live iCal feed URLs; and embeddable calendar widgets.

ICS Viewer is built for developers, short-term rental hosts, and anyone who works with calendar data. It handles recurring events, timezones, VTIMEZONE blocks, and real-world ICS files generated by Google Calendar, Apple Calendar, Outlook, Airbnb, Booking.com, Vrbo, and others.

## Tools

- [ICS Viewer](https://icsviewer.com/): Upload an .ics file or paste a public iCal URL to view events in a calendar
- [URL View](https://icsviewer.com/view): Open a live iCal feed by URL directly. Accepts a `url` query parameter — e.g. `https://icsviewer.com/view?url=https://example.com/calendar.ics` — to pre-load any public iCal feed and render it immediately. Useful for shareable calendar links.
- [Embed Builder](https://icsviewer.com/embed): Embed a calendar on your website. Paste an iCal feed URL, customize the design (colors, default view, height), then copy the generated `<script>` tag and paste it into any webpage to display a fully interactive calendar widget.

## Blog

Each post is available as clean markdown at `/blog/{slug}.md`.

- [What Is an ICS File? A Complete Guide to iCalendar](https://icsviewer.com/blog/what-is-an-ics-file): Explains the iCalendar format (RFC 5545), the structure of .ics files, RRULE recurrence, and common use cases
- [How to Export Google Calendar as an ICS File](https://icsviewer.com/blog/google-calendar-export-ics): Step-by-step guide to exporting events from Google Calendar as .ics, including single calendars, Google Takeout, and live subscription URLs
- [RFC 5545 Explained: Inside the iCalendar Specification](https://icsviewer.com/blog/icalendar-rfc5545-explained): Developer-oriented breakdown of the iCalendar spec — components, RRULE, timezone handling, X-properties, and common real-world pitfalls
- [How to Sync Calendars Across Airbnb, Booking.com, and Vrbo](https://icsviewer.com/blog/sync-airbnb-booking-vrbo-ical): How iCal-based calendar sync works for short-term rentals; step-by-step cross-import instructions and double-booking risk reduction
- [How to Export ICS Events to CSV or Excel](https://icsviewer.com/blog/export-ics-to-csv-excel): Exporting calendar events into spreadsheet format for time tracking, hour calculations, and printable event lists
- [Share Your Calendar as a Public Webpage](https://icsviewer.com/blog/share-calendar-as-public-webpage): Wrap a public iCal feed in ICS Viewer to create a shareable browser-friendly calendar link
- [Airbnb / Booking.com iCal Sync Not Working? How to Diagnose It](https://icsviewer.com/blog/airbnb-ical-sync-not-working): Diagnosing iCal sync failures — how to tell whether the feed itself is broken vs. a polling delay issue, and when to use a channel manager instead