Free Online ICS File and Add-to-Calendar Link Generator

Written by the Utiliby editorial team · Last updated October 12, 2026 · Rules and formulas reviewed October 2026

What is an ICS file and what does this generator do?

An ICS file, also called an iCalendar file or .ics file, is the universal way to move a calendar event from one place to another. It is a small text file that describes an event: what it is called, when it starts and ends, which time zone it uses, where it takes place, whether it repeats and when to remind you. Because the format is an open internet standard (RFC 5545), Apple Calendar, Google Calendar, Microsoft Outlook, Thunderbird, Yahoo Calendar and almost every other calendar app can read it.

This free online ICS file generator builds that file for you. You type the details in a normal form, and the tool writes a correct, standards-based file in your browser. It also builds Add to Calendar links for Google Calendar, Outlook.com, Microsoft 365 and Yahoo, previews every date of a repeating event, creates many events at once from a pasted list and checks existing .ics files for mistakes. Nothing is uploaded, nothing is stored and no account is required.

How to create a calendar event file step by step

1. Enter the basics. Add a title, a location or meeting link and a short description. The preview card updates as you type.
2. Set the date and time. Pick the start and end, or choose a quick duration. Tick All-day event if there is no time.
3. Choose the time zone. Use your device's zone, a named zone such as America/New_York, UTC, or floating time.
4. Add a repeat if needed. Choose daily, weekly, monthly or yearly, set the interval and the end, and skip any dates that should not happen.
5. Pick reminders. Tick the alerts you want, for example 15 minutes and one day before.
6. Download or copy. Press Download .ics file to get the file, or open the links tab to copy an Add to Google Calendar or Outlook link.

Open the Dates preview tab before you share the event. It shows a mini calendar and a list of every occurrence, so you can see at once if a monthly rule lands on the right day.

What is inside an ICS file

Reading a calendar file is easier than it looks. Every line is a property name, an optional list of parameters and a value. Blocks start with BEGIN: and end with END:. The whole file sits inside VCALENDAR, each event inside VEVENT, each reminder inside VALARM and each time zone definition inside VTIMEZONE.

Lines longer than 75 bytes are folded onto the next line, which begins with a space. The generator does this for you, including for accented and non-Latin characters, so a long description or an address in any language stays valid.

Time zones and daylight saving time, explained

Time zones cause most calendar mistakes. An event at 9:00 a.m. in New York is 2:00 p.m. in London for part of the year and 1:00 p.m. for another part, because the two places change their clocks on different dates. A calendar file can describe time in three ways.

• Named time zone. The start is written with a TZID such as Europe/Paris and the file includes a VTIMEZONE block that tells the app the zone's offsets and daylight-saving rules. This is the best choice for a real meeting at a real place, because everyone sees their own correct local time.
• UTC. The time ends in Z. It is the same instant everywhere, which is useful for global events defined in UTC, but a weekly UTC meeting drifts by an hour in local time when clocks change.
• Floating time. No zone at all. 9:00 means 9:00 wherever you are. It suits habits and reminders, and it is wrong for a meeting between people in different zones.

The generator finds the zone's real offset changes in your browser and writes them into the file. If a zone has a regular yearly rule, such as the last Sunday of March, the file contains a repeating rule so events years ahead are still right.

Repeating events, RRULE and skipped dates

A repeating event is stored once, with an RRULE that says how to create the other occurrences. The rule has a frequency (daily, weekly, monthly or yearly), an optional interval, optional details such as BYDAY=MO,WE and an end given by COUNT or UNTIL. Only one of those two ends is allowed.

Two points deserve care. First, a monthly event on the 31st is skipped in months that have no 31st, and a yearly event on 29 February happens only in leap years. That is how the standard works, so choose last weekday or a different day if you need every month. Second, the count includes skipped dates. If you ask for ten weekly meetings and skip one date, the series still ends on the same day as the tenth occurrence.

Use the Dates preview tab to see the effect of any setting. Skipped dates appear struck through and the mini calendar marks them in red.

Add to Google Calendar, Outlook and Yahoo links

An add-to-calendar link is an ordinary web address that opens a calendar service's new-event form with your details already filled in. It is the easiest way to let visitors save a webinar, a launch or a class to their calendar without downloading a file. The generator builds links for four services.

• Google Calendar accepts title, dates, time zone, location, description, guests and a repeat rule.
• Outlook.com and Microsoft 365 accept title, start, end, location and description.
• Yahoo Calendar accepts title, start, end or duration, location and description.
• Apple Calendar and most other apps use the .ics file.

For a button that works for everyone, offer both: the service links for convenience and a download link to the .ics file as a universal option. The ready-made HTML in the links tab includes the service links. Remember that the details are part of the link's address, so avoid putting private information in an event you publish.

Create many calendar events from a list

If you have a course timetable, a webinar series, a list of match days or a set of deadlines, entering events one by one is slow. The Many events at once tab turns a pasted list into one file. Write one event per line: the date, an optional time range, the title and optionally a location and a description, separated by vertical bars. Lines without a time become all-day events, and lines with only a start time last one hour. The tool reports any line it cannot read and tells you what to fix.

Import the resulting file once and every event appears together. Most calendar apps let you choose a separate calendar for the import, which makes it easy to remove the whole set later.

Check an ICS file that will not import

When an .ics file fails to import, the cause is nearly always small: a missing required line, a missing END:VEVENT, a time zone name the file never defines, both COUNT and UNTIL in a repeat rule, or an all-day end date that equals the start date. The checker reads the pasted text, unfolds long lines and reports each problem in plain language, then lists the events it found with their start, end and repeat rule.

It checks structure, not every rule of the standard, so a clean result is a good sign rather than a guarantee. If a file still misbehaves in one app, try importing it into a second app to see whether the problem lies with the file or the app.

Practical uses: events, courses, bookings and reminders

• Webinars and online events. Put an Add to Calendar link on the thank-you page and in the confirmation email to reduce no-shows.
• Schools and courses. Give students one file with every lecture and exam date.
• Clubs and sports. Share fixtures and training sessions as a file members can subscribe to or import.
• Businesses. Add appointment confirmations, delivery windows or opening-day events to a booking email.
• Personal planning. Create birthdays, anniversaries, bill dates, renewals and yearly reminders with alerts.
• Travel. Add flights, check-ins and tours with the correct local time zone.

Tips for events people will actually attend

• Put the most important information in the title, such as the topic and the format.
• Include the meeting link or address in the location field, where phones show it in one tap.
• Use a named time zone for anything involving more than one place.
• Add a reminder that matches the effort needed to get ready, such as one day before for a trip and 10 minutes before for a call.
• State the time zone in the description as well, so the event is clear even if the file is printed.
• For a series, preview the dates, and skip public holidays you know about.

Common mistakes with calendar files and links

• Using floating time for a shared meeting. Each person sees the same clock time in their own zone, which is almost never what you want.
• Forgetting that the all-day end date is exclusive. A one-day event must end on the following date in the file. The form handles this for you.
• Putting both COUNT and UNTIL in a rule. The standard forbids it.
• Expecting a link to repeat. Only Google Calendar links carry a repeat rule.
• Sending an update without a stable ID. A new ID creates a second event rather than changing the first.
• Assuming reminders always import. Some apps replace imported alerts with their own defaults.

Privacy

The generator runs in your browser. The title, description, location, guests and every other detail stay on your device, and the file is created locally. Nothing is stored, and reloading the page clears the form. A link you generate contains your event details in its address, so share it only with the people who should see them.

Frequently asked questions

Sources and further reading

• Internet Engineering Task Force, RFC 5545: Internet Calendaring and Scheduling Core Object Specification (iCalendar), including the VEVENT, VALARM, VTIMEZONE and RRULE definitions.
• Internet Engineering Task Force, RFC 5546: iCalendar Transport-Independent Interoperability Protocol (iTIP), for organizer and attendee methods.
• IANA Time Zone Database documentation, the source of the named time zones used in the time zone list.
• Google Calendar Help, adding events to Google Calendar and importing events from a file.
• Microsoft Support, importing an iCalendar (.ics) file into Outlook.
• Apple Support, adding events and importing calendar files in Calendar.

Sources were consulted in October 2026. Standards and rules can change, so always check the official page for your situation.