25 KB XLSX sample
An XLSX file of exactly 25,600 bytes. It is a valid Excel workbook (Office Open XML) file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 25 KB sample, test or dummy XLSX file.
Download
sample-xlsx-25kb.xlsx
25 KB25,600 bytes
Download 25 KB XLSXCreated 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.openxmlformats-officedocument.spreadsheetml.sheet
- SHA-256
17b2298e9ddd22c5f4c8c84ea7eb14426fcf764ed1ab85e452df3fe011ce95d6- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
One worksheet with a bold, frozen header row and 213 rows of fictional orders: text, dates, numbers and a formula in every row. 2,037 bytes of text in the workbook description property bring the file to the exact size.
| Sheets | 1 (Orders) |
|---|---|
| Data rows | 213 |
| Columns | 9 |
| Formulas | 213 (total = quantity × unit price) |
| Frozen panes | Header row |
| Macros | None |
| Container | ZIP (Office Open XML) |
First bytes of the file
The first 64 bytes of sample-xlsx-25kb.xlsx as a hex dump: offset, bytes, then the same bytes as text. The XLSX signature is 50 4B 03 04.
00000000 50 4b 03 04 14 00 00 00 08 00 00 00 21 5c 19 27 |PK..........!\.'|
00000010 be 30 61 01 00 00 96 03 00 00 13 00 00 00 5b 43 |.0a...........[C|
00000020 6f 6e 74 65 6e 74 5f 54 79 70 65 73 5d 2e 78 6d |ontent_Types].xm|
00000030 6c b2 b1 af c8 cd 51 28 4b 2d 2a ce cc cf b3 55 |l.....Q(K-*....U|Preview
XLSX files cannot be shown in a browser. Download the file and open it in an application that reads XLSX, such as Microsoft Excel.
Where 25 KB matters
A 25,600-byte file: the size of a small web image or a short document. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| TCP initial congestion window | About 14.6 KB (10 segments) | 25 KB needs at least two flights of packets on a new connection. |
| Base64 encoding | Adds 33 percent | A 25 KB file becomes about 34 KB inside JSON or an email. |
Use this file for
- Checking thumbnail and icon handling
- Verifying formula handling
- Load-testing importers with many rows
Testing notes for XLSX
- A date cell is a number with a format; importers that ignore the format show values such as 45123 instead of a date.
- Reading a large workbook with a DOM-style library can use many times the file size in memory. Test with the 5 MB and 10 MB samples and prefer streaming readers.
Technical details
| File name | sample-xlsx-25kb.xlsx |
|---|---|
| Format | XLSX (Excel workbook (Office Open XML)) |
| Extension | .xlsx |
| MIME type | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Size | 25,600 bytes (25 KB) |
| Kind | Binary |
| Signature | 50 4B 03 04 |
| SHA-256 | 17b2298e9ddd22c5f4c8c84ea7eb14426fcf764ed1ab85e452df3fe011ce95d6 |
| 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-xlsx-25kb.xlsx # Linux
shasum -a 256 sample-xlsx-25kb.xlsx # macOSOn Windows, run Get-FileHash sample-xlsx-25kb.xlsx -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 25 KB?
- Yes. It is 25,600 bytes, which is 25 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 25 KB XLSX file?
- One worksheet with a bold, frozen header row and 213 rows of fictional orders: text, dates, numbers and a formula in every row. 2,037 bytes of text in the workbook description property bring the file to the exact size.
- How many rows are in the 10 MB XLSX sample?
- The exact row count is listed on each download page. Because XLSX is compressed, a 10 MB workbook holds a few hundred thousand rows.