1 MB ICS sample file
An ICS file of exactly 1,048,576 bytes. It is a valid iCalendar file file, generated for this site and checked with an independent parser.
Download
sample-ics-1mb.ics
1 MB1,048,576 bytes
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- Type
- text/calendar
- SHA-256
30a1d7a2dc50fe76d023ff1f3c3e6e6a323f99b05fa9ad204a6b2b28204a1fac- Direct URL
https://sampletestfiles.com/downloads/ics/sample-ics-1mb.ics
What is in this file
A VCALENDAR object with 3,075 VEVENT components, each with a unique UID, start and end times, a summary, a description and a location. Non-standard X- property lines, which calendar software ignores, bring the file to the exact size.
| Events | 3,075 |
|---|---|
| iCalendar version | 2.0 |
| Time zone | UTC |
| Line endings | CRLF, folded at 75 octets |
| Encoding | UTF-8 (ASCII characters only) |
How the file begins
The opening lines of sample-ics-1mb.ics, exactly as they appear in the file.
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//SampleTestFiles//Sample Calendar//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
UID:a6cf3b6b-cd57-4173-a942-a2339c75f449@example.com
DTSTAMP:20260101T000000Z
DTSTART:20260105T090000Z
DTEND:20260105T100000Z
SUMMARY:Review meeting 1 with Ethan Zeller
DESCRIPTION:This sample file exists so that software can be tested with rea
listic input.
LOCATION:Pune\, INPreview
Shows the first 64 KB of the file.
Where 1 MB matters
A 1,048,576-byte file: exactly the default upload limit of nginx, Spring Boot and Next.js. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| nginx | 1 MB by default (client_max_body_size) | A multipart upload of this file exceeds the limit by the size of the form boundaries. |
| Spring Boot multipart | 1 MB per file by default (max-file-size) | A file of exactly 1 MB is at the limit. |
| Next.js API routes and Server Actions | 1 MB by default | Larger bodies need the size limit raised in configuration. |
| Cloud Firestore documents | 1 MiB (1,048,576 bytes) | The same number of bytes as this file. |
| Apache Kafka messages | About 1 MB by default | Brokers reject larger records unless message.max.bytes is raised. |
Use this file for
- Download tests on mobile connections
- Checking time-zone handling
- Testing invitation processing
Testing notes for ICS
- Importing the same UID twice should update an event, not duplicate it.
- Time zones and recurrence rules are where calendar software fails. The samples use UTC and non-recurring events, so they work as a known-good baseline.
Technical details
| File name | sample-ics-1mb.ics |
|---|---|
| Format | ICS (iCalendar file) |
| Extension | .ics |
| MIME type | text/calendar |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Text |
| SHA-256 | 30a1d7a2dc50fe76d023ff1f3c3e6e6a323f99b05fa9ad204a6b2b28204a1fac |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Available on this page |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Email & Calendar |
Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Download from the command line and verify
Fetch the file with curl, then compare its checksum with the SHA-256 value above.
curl -o sample-ics-1mb.ics 'https://sampletestfiles.com/downloads/ics/sample-ics-1mb.ics'
sha256sum sample-ics-1mb.ics # Linux
shasum -a 256 sample-ics-1mb.ics # macOSOn Windows, run Get-FileHash sample-ics-1mb.ics -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.
Related files
Questions about this file
- Is this file exactly 1 MB?
- Yes. It is 1,048,576 bytes, which is 1 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 MB ICS file?
- A VCALENDAR object with 3,075 VEVENT components, each with a unique UID, start and end times, a summary, a description and a location. Non-standard X- property lines, which calendar software ignores, bring the file to the exact size.
- Do the events repeat?
- No. Each event is a single one-hour meeting in UTC with its own UID.