Is this tool completely free?

Yes, this tool is 100% free to use with no hidden costs, trials, or subscriptions required.

Do I need to register or sign up?

No registration or sign-up required. Simply use the tool directly in your browser.

Is my data uploaded to a server?

No, all processing happens locally in your browser. Your data never leaves your device, ensuring complete privacy.

Can I use this tool offline?

Yes, once loaded, many features work offline thanks to Progressive Web App technology.

ICS Calendar Toolbox – Free Online Tool

What can this tool do?

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Merge Multiple Calendars

Combine multiple ICS files from Google Calendar, Outlook, Apple Calendar, or other calendar apps into one unified calendar file.

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Filter & Search Events

Filter events by keywords, date ranges, or event types. Extract only the events you need from large calendar files.

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Fix Timezone Issues

Adjust event times for different timezones. Perfect for handling calendars from different countries or regions.

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100% Private & Offline

All processing happens in your browser. Your calendar files never leave your device.

Common Use Cases

💼 Combine work and personal calendars into one file
📚 Extract specific events (e.g., all "meetings" or "classes")
✈️ Adjust calendar times when traveling across timezones
🗓️ Clean up calendar exports before importing to another app
📊 Merge multiple project calendars from different teams

Upload Your ICS Files

Upload one or more .ics calendar files to get started. You can drag and drop files or click to browse.

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Drop ICS files here or click to choose

Supports multiple files at once

Filter & Options (Optional)

🔍 Keyword Filter Only keep events matching this keyword 🚫 Exclude Keyword Remove events that match this keyword 📅 Date From Only keep events after this date 📅 Date To Only keep events before this date 📌 Event Type Filter by timed vs all-day events ↕ Sort By Sort preview and export results

🌍 Timezone Offset (minutes) Add or subtract minutes to adjust times (e.g., +480 for UTC+8) 🕒 Offset Preset Quickly fill timezone offset 🧾 Calendar Name Used by some calendar apps on import ⬇️ Download Name Filename without extension

Expand recurring events (experimental) Highlight conflicting events Show conflicts only Remove duplicate events (UID + start)

💡 How to Get Your ICS Files

Google Calendar: Settings → Export → Download .ics file Settings → Export → Download .ics file
Outlook: File → Save Calendar → Save as .ics File → Save Calendar → Save as .ics
Apple Calendar: File → Export → Export File → Export → Export
Other apps: Look for "Export" or "Download" options in calendar settings Look for "Export" or "Download" options in calendar settings

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Your privacy matters: All processing happens locally in your browser. Your calendar files are never uploaded to any server. All processing happens locally in your browser. Your calendar files are never uploaded to any server.