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CSV to ICS Converter
シフト・授業・締切テンプレから iCalendar(.ics) を生成します。処理はブラウザ内で完結します。
必須ヘッダー: summary, start, end
Detected delimiter: ,
Security Guardrails
- ブラウザ内処理のみ（アップロードなし）
- CSV式文字列の中和オプション（既定ON）
- サイズ上限: 2MB、行上限: 5000
- バイナリ混入を検知した場合は処理を中断
CSV to ICS Converter: Guide
- Intent
- Convert schedule CSV files to iCalendar (.ics) with template-based validation, then import into your calendar app. Local-only processing.
- What it does
- Reads template-based CSV input, validates required fields/date formats/optional recurrence rules, then generates standards-friendly .ics output for calendar import.
- Key features
- Shift/Class/Deadline templates, Validation errors by row, Timezone mode (floating/TZID/UTC), RRULE (freq/interval/count/until/byday/bymonthday/bymonth/bysetpos/wkst), Error rows CSV export, ICS download, Local-only processing
- Privacy
- Everything runs locally in your browser. CSV data is not uploaded.
- Best for
- Operations teams converting existing schedule CSV files into calendar events
- People who want to avoid manual event-by-event calendar entry
- Users who need local-only conversion for sensitive schedule data
- Why this tool
- Template-first mapping reduces setup mistakes
- Validation catches broken date and recurrence formats before export
- Error rows can be exported and fixed in bulk
- Security guardrails (formula neutralization + input limits) are built in
How to use
- 1Select a template (Shift, Class, or Deadline).
- 2Upload CSV or paste CSV text.
- 3Set date-time mode (floating, TZID, or UTC).
- 4Run Validate & Build ICS and fix any row errors.
- 5Download the generated .ics file and import it into your calendar.
Common mistakes
- Using wrong date format (expected YYYY-MM-DD HH:mm or YYYY-MM-DD by template).
- Invalid RRULE inputs (freq/interval/count/until/byday/bymonthday/bymonth/bysetpos/wkst format).
- Missing required headers for the selected template.
- Trying to process extremely large files beyond local safety limits.
Examples
Shift schedule import
Template: Shift
Headers: summary,start,end,location,description,url
Output: .ics with one VEVENT per row
Deadline import
Template: Deadline
Headers: summary,due_date,description,url,all_day
Output: all-day events in .ics