ICS to CSV Converter
Processing entirely on your device — large files may take a moment.
iCalendar File and CSV Spreadsheet exist for different jobs: ICS is iCalendar — the format every calendar app exports: events with dates, locations, organisers and recurrence rules. CSV is the common language of data — importing contacts, analytics exports and database dumps almost always expects CSV.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How ICS compares to CSV
| ICS | CSV | |
|---|---|---|
| Structure | VEVENT / VTODO blocks | One flat table |
| Types / schema | Dates, durations, text props | Untyped (all strings) |
| Compatibility | Google, Outlook, Apple Calendar | Excel, Sheets, databases, code |
| Best for | Schedules and event lists | Data exchange and bulk import |
How to convert ICS to CSV
- 1
Select your files
Drag & drop your ICS files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to CSV". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted CSV file individually, or grab everything at once as a ZIP archive.
About the ICS format
ICS is iCalendar (RFC 5545): the text format every calendar system imports and exports. Events carry start/end times, locations, organisers, attendees, alarms and recurrence rules — which makes an .ics attachment a small database of “what happens when”.
Flattening ICS to CSV turns that database into rows: one event per line with columns for time, place and summary — ideal for auditing a shared calendar, merging timetables or feeding a spreadsheet.
+ Strengths
- ✓Universal calendar interchange
- ✓Carries recurrence and alarms
- ✓Plain text, easy to parse
! Limitations
- −Recurring events expand only on export
- −Timezones are easy to get wrong
About the CSV format
CSV (comma-separated values) is the lowest common denominator of tabular data: one table, rows as lines, columns separated by commas, everything plain text. Excel, Google Sheets, every database importer, every data-science library and every scripting language read it, which is why it has survived fifty years of format fashion.
Its weaknesses come from the same minimalism. There are no types (everything is a string until you decide otherwise), no formulas, one table per file, and dialect quirks are legendary: comma vs semicolon locales, quoting rules, and Excel's insistence on re-opening UTF-8 files without a BOM as mojibake. Clean, well-formed UTF-8 CSV with a BOM sidesteps nearly all of it.
+ Strengths
- ✓Universal: Excel, Sheets, databases and code all read it
- ✓Human-readable and diff-friendly
- ✓Streams well — process giant files line by line
! Limitations
- −No types, no formulas, no multiple sheets
- −Dialect chaos: delimiters, quoting, encoding
- −Nested or hierarchical data does not fit
Why convert ICS to CSV?
There is a concrete reason this conversion exists: Recurring events expand only on export CSV sidesteps that — Universal: Excel, Sheets, databases and code all read it If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this ICS to CSV converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
What about special characters and non-English text?
Everything is handled as UTF-8. When you export CSV for Excel, a UTF-8 BOM is included automatically so Chinese, Japanese, Korean and accented characters display correctly on both Windows and macOS.
Is my data safe here?
Yes. The conversion is plain JavaScript running in your tab: the data is parsed and re-serialized in memory, never sent anywhere, and disappears when you close the page.
Are formulas, styles or multiple sheets converted?
No — this conversion extracts the data itself into CSV. Formulas are exported as their current values, styling is not carried over, and multi-sheet workbooks convert sheet by sheet. For full fidelity between spreadsheet formats, exchange within the same tool family.