50 KB ZIP sample file

A ZIP file of exactly 51,200 bytes. It is a valid ZIP archive file, generated for this site and checked with an independent parser.

sample-zip-50kb.zip

50 KB51,200 bytes

Download 50 KB ZIP

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Type: application/zip
SHA-256: f9a9b3817c9f9dc0e13c8433432c031f52088d3e337819baacfb62384933361f
Direct URL: https://sampletestfiles.com/downloads/zip/sample-zip-50kb.zip

What is in this file

4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 47,945 pseudo-random bytes stored without compression so the archive is exactly 51,200 bytes.

Entries	4
Compression	Deflate for text entries, stored for payload.bin
Encrypted	No
ZIP64	No
Largest entry	payload.bin, 47,945 bytes

First bytes of the file

The first 64 bytes of sample-zip-50kb.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 e6 dc  |PK..........!\..|
00000010  cc e8 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 44 2c 5c 80 0d b1 20 c1 c4 e6  |....#.D,\... ...|

Preview

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

Where 50 KB matters

A 51,200-byte file, half of the default body limit in several web frameworks. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Express body parsers	100 KB by default	50 KB is accepted; 500 KB is rejected with 413 unless the limit is raised.
Base64 encoding	Adds 33 percent	50 KB becomes about 67 KB when embedded in JSON.

All 50 KB sample files

Use this file for

Testing document previews
Checking limits on extracted size and entry count
Testing bulk import features

Testing notes for ZIP

Entry names may contain "../". Extracting without validating paths lets an archive write outside the target folder.
Windows reports ZIP uploads as application/x-zip-compressed, so allow-lists need both MIME types.

ZIP format reference

Technical details

File name	sample-zip-50kb.zip
Format	ZIP (ZIP archive)
Extension	.zip
MIME type	application/zip
Size	51,200 bytes (50 KB)
Kind	Binary
Signature	50 4B 03 04
SHA-256	f9a9b3817c9f9dc0e13c8433432c031f52088d3e337819baacfb62384933361f
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-50kb.zip 'https://sampletestfiles.com/downloads/zip/sample-zip-50kb.zip'
sha256sum sample-zip-50kb.zip     # Linux
shasum -a 256 sample-zip-50kb.zip # macOS

On Windows, run Get-FileHash sample-zip-50kb.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 50 KB?: Yes. It is 51,200 bytes, which is 50 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 50 KB ZIP file?: 4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 47,945 pseudo-random bytes stored without compression so the archive is exactly 51,200 bytes.
What is inside the sample ZIP files?: A README, a small CSV file, a small JSON file and a payload.bin entry of pseudo-random bytes that sets the archive size. The smallest archives hold fewer entries.

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