20 MB ODT sample
An ODT file of exactly 20,971,520 bytes. It is a valid OpenDocument Text file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 20 MB sample, test or dummy ODT file.
Download
sample-odt-20mb.odt
20 MB20,971,520 bytes
Download 20 MB ODTCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- application/vnd.oasis.opendocument.text
- SHA-256
c901dbfb4dc666e37f2ec9668c2b67c38c5ae3da9115bae3b6a96e1aca54b09b- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
An OpenDocument text document with a title, one embedded test-card PNG and 842,634 sections of headings, paragraphs and lists. Text in the document description (meta.xml) brings the file to the exact size.
| Sections | 842,634 |
|---|---|
| Images | 1 PNG, 477 × 366 px |
| ODF version | 1.3 |
| Macros | None |
| Container | ZIP (OpenDocument package) |
First bytes of the file
The first 64 bytes of sample-odt-20mb.odt as a hex dump: offset, bytes, then the same bytes as text. The ODT signature is 50 4B 03 04.
00000000 50 4b 03 04 0a 00 00 00 00 00 00 00 21 5c 5e c6 |PK..........!\^.|
00000010 32 0c 27 00 00 00 27 00 00 00 08 00 00 00 6d 69 |2.'...'.......mi|
00000020 6d 65 74 79 70 65 61 70 70 6c 69 63 61 74 69 6f |metypeapplicatio|
00000030 6e 2f 76 6e 64 2e 6f 61 73 69 73 2e 6f 70 65 6e |n/vnd.oasis.open|Preview
ODT files cannot be shown in a browser. Download the file and open it in an application that reads ODT, such as LibreOffice Writer and Apache OpenOffice.
Where 20 MB matters
A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Microsoft Outlook | 20 MB of attachments by default for internet mail accounts | This file is right at the limit; add a second attachment and it is exceeded. |
| Gmail | 25 MB per message | Under the limit, although email encoding adds about a third in transit. |
| GitHub web uploads | 25 MiB per file added through the browser | Accepted. Pushing with Git allows larger files. |
| Cloudflare Pages assets | 25 MiB per file | The largest round size that can be served as a static asset. |
| Amazon API Gateway | 10 MB payload | Rejected; the upload has to go directly to object storage. |
| ASP.NET Core (Kestrel) | About 28.6 MB request body by default | Accepted with room for the multipart overhead. |
Use this file for
- Finding the first upload limit in a new stack
- Testing document uploads in public-sector and education software, where ODT is often mandatory
- Checking conversion between ODT, DOCX and PDF
Testing notes for ODT
- Layout rarely survives a round trip through Word unchanged: fonts, numbering and tables are the usual casualties.
- Reading the type from the mimetype entry only works if that entry comes first and is not compressed. Tools that re-zip a document tend to break both rules, and strict readers then reject the file.
Technical details
| File name | sample-odt-20mb.odt |
|---|---|
| Format | ODT (OpenDocument Text) |
| Extension | .odt |
| MIME type | application/vnd.oasis.opendocument.text |
| Size | 20,971,520 bytes (20 MB) |
| Kind | Binary |
| Signature | 50 4B 03 04 |
| SHA-256 | c901dbfb4dc666e37f2ec9668c2b67c38c5ae3da9115bae3b6a96e1aca54b09b |
| 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 | Not available for this file; details only |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Documents |
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-odt-20mb.odt # Linux
shasum -a 256 sample-odt-20mb.odt # macOSOn Windows, run Get-FileHash sample-odt-20mb.odt -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 20 MB?
- Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 20 MB ODT file?
- An OpenDocument text document with a title, one embedded test-card PNG and 842,634 sections of headings, paragraphs and lists. Text in the document description (meta.xml) brings the file to the exact size.
- Will the ODT samples open in Microsoft Word?
- Yes. Word has opened OpenDocument text files since Word 2007 Service Pack 2. The samples use only headings, paragraphs, a list, a table and one image.