10 MB ICS sample
An ICS file of exactly 10,485,760 bytes. It is a valid iCalendar file file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 10 MB sample, test or dummy ICS file.
Download
sample-ics-10mb.ics
10 MB10,485,760 bytes
Download 10 MB ICSCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- text/calendar
- SHA-256
1c8efb5588763209fea1c098068c8b44753c128fe5c71249ecf6e9206dcce993- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
A VCALENDAR with 30,661 one-hour events, each with a UID, start and end in UTC, a summary, a folded description and an escaped location. Extension properties (X-FIXTURE-PAD), which calendar programs ignore, bring the file to the exact size.
| Events | 30,661 |
|---|---|
| Version | iCalendar 2.0 (RFC 5545) |
| 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-10mb.ics, exactly as they appear in the file.
00000000 42 45 47 49 4e 3a 56 43 41 4c 45 4e 44 41 52 0d |BEGIN:VCALENDAR.|
00000010 0a 56 45 52 53 49 4f 4e 3a 32 2e 30 0d 0a 50 52 |.VERSION:2.0..PR|
00000020 4f 44 49 44 3a 2d 2f 2f 53 61 6d 70 6c 65 54 65 |ODID:-//SampleTe|
00000030 73 74 46 69 6c 65 73 2f 2f 53 61 6d 70 6c 65 20 |stFiles//Sample |Preview
Creates the file in your browser and shows the first 64 KB of it.
Where 10 MB matters
A 10,485,760-byte file: over the default limits of PHP, API Gateway and Spring Boot requests. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Amazon API Gateway | 10 MB payload | A 10 MB file in a multipart or base64 body is over the limit. |
| Spring Boot multipart | 10 MB per request by default (max-request-size) | Exceeded once form overhead is added. |
| PHP | 8 MB POST body by default (post_max_size) | Rejected before the script runs. |
| Amazon S3 multipart upload | 5 MiB minimum part size | This file splits into exactly two minimum-sized parts. |
| Email attachments | Commonly 20 to 25 MB per message | 10 MB fits, at about 13.3 MB once encoded. |
Use this file for
- Finding the first upload limit in a new stack
- Testing invitation processing
- Testing calendar import and subscription
Testing notes for ICS
- 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.
- Importing the same UID twice should update an event, not duplicate it.
Technical details
| File name | sample-ics-10mb.ics |
|---|---|
| Format | ICS (iCalendar file) |
| Extension | .ics |
| MIME type | text/calendar |
| Size | 10,485,760 bytes (10 MB) |
| Kind | Text |
| SHA-256 | 1c8efb5588763209fea1c098068c8b44753c128fe5c71249ecf6e9206dcce993 |
| Created | 2026-10-23 |
| Validation | See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility. |
| Preview | Available on this page |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Email & Calendar |
Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.
sha256sum sample-ics-10mb.ics # Linux
shasum -a 256 sample-ics-10mb.ics # macOSOn Windows, run Get-FileHash sample-ics-10mb.ics -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.
Related files
Questions about this file
- Is this file exactly 10 MB?
- Yes. It is 10,485,760 bytes, which is 10 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 10 MB ICS file?
- A VCALENDAR with 30,661 one-hour events, each with a UID, start and end in UTC, a summary, a folded description and an escaped location. Extension properties (X-FIXTURE-PAD), which calendar programs ignore, 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.