25 KB ZIP sample file

A ZIP file of exactly 25,600 bytes. It is a valid ZIP archive file, generated for this site and checked with an independent parser.

sample-zip-25kb.zip

25 KB25,600 bytes

Download 25 KB ZIP

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Type: application/zip
SHA-256: 7e67a6ddae14ff320dd9060906b31e096f8f5a582717a908a1d6503ec6170162
Direct URL: https://sampletestfiles.com/downloads/zip/sample-zip-25kb.zip

What is in this file

4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 22,345 pseudo-random bytes stored without compression so the archive is exactly 25,600 bytes.

Entries	4
Compression	Deflate for text entries, stored for payload.bin
Encrypted	No
ZIP64	No
Largest entry	payload.bin, 22,345 bytes

First bytes of the file

The first 64 bytes of sample-zip-25kb.zip as a hex dump: offset, bytes, then the same bytes as text. The ZIP signature is 50 4B 03 04.

00000000  50 4b 03 04 14 00 00 00 08 00 00 00 21 5c 87 d9  |PK..........!\..|
00000010  c1 86 6c 00 00 00 7a 00 00 00 0a 00 00 00 52 45  |..l...z.......RE|
00000020  41 44 4d 45 2e 74 78 74 05 c1 31 0e c2 30 0c 05  |ADME.txt..1..0..|
00000030  d0 bd a7 f8 23 0c 64 40 e2 02 6c 88 05 09 26 36  |....#.d@..l...&6|

Preview

ZIP files cannot be shown in a browser. Download the file and open it with Windows Explorer, macOS Archive Utility, 7-Zip.

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.

All 25 KB sample files

Use this file for

Testing avatar and logo uploads
Testing archive uploads and extraction
Checking limits on extracted size and entry count

Testing notes for ZIP

An archive can expand to far more than its own size. Enforce limits on total extracted bytes and entry count to guard against zip bombs.
Entry names may contain "../". Extracting without validating paths lets an archive write outside the target folder.

ZIP format reference

Technical details

File name	sample-zip-25kb.zip
Format	ZIP (ZIP archive)
Extension	.zip
MIME type	application/zip
Size	25,600 bytes (25 KB)
Kind	Binary
Signature	50 4B 03 04
SHA-256	7e67a6ddae14ff320dd9060906b31e096f8f5a582717a908a1d6503ec6170162
Created	2026-10-10
Validation	Exact size, signature bytes and structure checked when the file was generated
Preview	Not available for this format; details only
Source	Generated for this site; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Archives

Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Download from the command line and verify

Fetch the file with curl, then compare its checksum with the SHA-256 value above.

curl -o sample-zip-25kb.zip 'https://sampletestfiles.com/downloads/zip/sample-zip-25kb.zip'
sha256sum sample-zip-25kb.zip     # Linux
shasum -a 256 sample-zip-25kb.zip # macOS

On Windows, run Get-FileHash sample-zip-25kb.zip -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.

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 ZIP file?: 4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 22,345 pseudo-random bytes stored without compression so the archive is exactly 25,600 bytes.
Are the archives encrypted?: No. They are not encrypted or password-protected and do not use ZIP64.

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