Dummy 10 MB RAR File
Generate and download a dummy 10 MB RAR file. The download is exactly 10,485,760 bytes, created in your browser and never uploaded.
Need a different size? Make a dummy RAR file of any size from 512 Bytes to 1 GB.
Testing with a 10 MB RAR file
Ten megabytes equals the Amazon API Gateway REST payload quota and the default Exchange attachment limit in Outlook. Test just under, at and just over it, because exactly 10 MB usually fails once headers or encoding are added.
At this size, extraction and virus scanning take long enough to show whether background jobs and progress messages behave.
RAR support is the variable here, not size. Send this file and the dummy 10 MB ZIP file through the same pipeline: if only the RAR fails, your handler lacks RAR5 support and does not have a size problem.
- Exact size (binary)
- 10,485,760 bytes
- Decimal equivalent
- 10,000,000 bytes
- Base64-encoded size
- 13,981,016 bytes
- Format
- RAR5, store method (no compression)
- Entries
- 2 (README.txt, archive_payload.dat)
Exact size and boundary files for 10 MB
Set the unit to B and enter these byte counts to test either reading of 10 MB.
| Limit defined as | One under (should pass) | At the limit | One over (should fail) |
|---|---|---|---|
| Binary 10 MB | One under (should pass) 10,485,759 B | At the limit 10,485,760 B | One over (should fail) 10,485,761 B |
| Decimal 10 MB | One under (should pass) 9,999,999 B | At the limit 10,000,000 B | One over (should fail) 10,000,001 B |
Limits closest to 10 MB
A 10 MB file is over nginx (1 MB), PHP (2 MB) and AWS Lambda (6 MB); exactly at API Gateway (10 MB) and Outlook with Exchange (10 MB); under Outlook with internet accounts (20 MB), Gmail (25 MB) and Cloudflare Free and Pro (100 MB). Sent as base64 text it grows past API Gateway and Outlook with Exchange.
| Limit | Size | Notes |
|---|---|---|
| Amazon API Gateway REST API payload | 10 MB 10,485,760 B | Hard quota for REST APIs. |
| Outlook default attachment limit (Exchange accounts) | 10 MB 10,485,760 B | Administrators can change it. |
| Outlook attachment limit (internet accounts) | 20 MB 20,971,520 B | Per Microsoft Outlook guidance. |
Other dummy RAR file sizes
Smaller: 1 MB RAR. Larger: 100 MB RAR. Or see the full dummy RAR file generator.
Other 10 MB dummy files
The same size in another file type.
10 MB RAR file FAQ
Is the 10 MB RAR file exactly 10 MB?
Yes: 10,485,760 bytes in binary units. For a decimal 10 MB, set the unit to B and enter 10,000,000.
What is inside a 10 MB dummy RAR?
Two entries: README.txt, which explains what the file is, and archive_payload.dat, which is zero bytes. The payload is all but under 1 KB of the 10,485,760 bytes, and the store method means it extracts to about the same size.
Which tools open a 10 MB dummy RAR?
Tools that read RAR5. At sizes up to 100 MB we check the generated archive with UnRAR and 7-Zip, which test it, and bsdtar (libarchive), which lists it. A tool that only reads the older RAR4 format cannot open it.
Will a 10 MB RAR file pass the Amazon API Gateway REST API payload?
Probably not. At exactly 10,485,760 bytes it equals the 10 MB limit in binary units, and a form upload adds a few hundred bytes of multipart boundary and headers, so the body ends up over. Counted in decimal megabytes (10,000,000 bytes) the file is 485,760 bytes over. Test one byte under to see it pass. As base64 it is 13,981,016 characters, over the limit, and that is the size that counts in a JSON body or an email.
Is the file uploaded anywhere?
No. It is generated in your browser and never leaves your device.