20 MB ODS sample

An ODS file of exactly 20,971,520 bytes. It is a valid OpenDocument Spreadsheet 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 ODS file.

sample-ods-20mb.ods

20 MB20,971,520 bytes

Download 20 MB ODS

Created 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.spreadsheet
SHA-256: e0b3d463a9fa4cba609e2cf561fdd019eb1897fa800d5c65b7118c211c77cb16
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

An OpenDocument spreadsheet with one sheet, a bold header row and 244,203 rows of fictional customers: numbers, text, ISO dates and a formula in every row. Text in the document description (meta.xml) brings the file to the exact size.

Sheets	1 (Customers)
Data rows	244,203
Columns	7
Formulas	244,203
ODF version	1.3
Container	ZIP (OpenDocument package)

First bytes of the file

The first 64 bytes of sample-ods-20mb.ods as a hex dump: offset, bytes, then the same bytes as text. The ODS signature is 50 4B 03 04.

00000000  50 4b 03 04 0a 00 00 00  00 00 00 00 21 5c 85 6c |PK..........!\.l|
00000010  39 8a 2e 00 00 00 2e 00  00 00 08 00 00 00 6d 69 |9.............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

ODS files cannot be shown in a browser. Download the file and open it in an application that reads ODS, such as LibreOffice Calc 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.

All 20 MB sample files

Use this file for

Finding the first upload limit in a new stack
Testing spreadsheet import alongside XLSX and CSV
Checking date and number conversion

Testing notes for ODS

Dates are real dates in ODS and serial numbers in XLSX, so code written for one format mishandles the other.
Rows and cells can be run-length encoded with a "repeated" attribute. A sheet that looks empty may declare a million repeated rows, and a reader that expands them literally runs out of memory.

ODS format reference

Technical details

File name	sample-ods-20mb.ods
Format	ODS (OpenDocument Spreadsheet)
Extension	.ods
MIME type	application/vnd.oasis.opendocument.spreadsheet
Size	20,971,520 bytes (20 MB)
Kind	Binary
Signature	50 4B 03 04
SHA-256	e0b3d463a9fa4cba609e2cf561fdd019eb1897fa800d5c65b7118c211c77cb16
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	Spreadsheets

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-ods-20mb.ods     # Linux
shasum -a 256 sample-ods-20mb.ods # macOS

On Windows, run Get-FileHash sample-ods-20mb.ods -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 ODS file?: An OpenDocument spreadsheet with one sheet, a bold header row and 244,203 rows of fictional customers: numbers, text, ISO dates and a formula in every row. Text in the document description (meta.xml) brings the file to the exact size.
What do the ODS samples contain?: One sheet of fictional orders with a bold header row. Each row has text, a date, numbers and a formula that multiplies quantity by unit price.

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