500 KB ZIP sample file

A ZIP file of exactly 512,000 bytes. It is a valid ZIP archive file, generated for this site and checked with an independent parser.

sample-zip-500kb.zip

500 KB512,000 bytes

Download 500 KB ZIP

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Type: application/zip
SHA-256: 3f977498bfa0cfc3d65f367bf268bd17819e47e2cebdc3bc2bf666d099770570
Direct URL: https://sampletestfiles.com/downloads/zip/sample-zip-500kb.zip

What is in this file

4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 508,743 pseudo-random bytes stored without compression so the archive is exactly 512,000 bytes.

Entries	4
Compression	Deflate for text entries, stored for payload.bin
Encrypted	No
ZIP64	No
Largest entry	payload.bin, 508,743 bytes

First bytes of the file

The first 64 bytes of sample-zip-500kb.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 d3 95  |PK..........!\..|
00000010  f4 5d 6d 00 00 00 7b 00 00 00 0a 00 00 00 52 45  |.]m...{.......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 54 5d b8 00 1b 62 41 82 89 cd  |....#.T]...bA...|

Preview

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

Where 500 KB matters

A 512,000-byte file: larger than most API body limits, smaller than most upload limits. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Amazon DynamoDB items	400 KB per item	500 KB cannot be stored as a single item.
Express body parsers	100 KB by default	Rejected unless the limit is raised.
nginx request body	1 MB by default (client_max_body_size)	Accepted with room to spare.

All 500 KB sample files

Use this file for

Testing that APIs return 413 for oversized bodies
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-500kb.zip
Format	ZIP (ZIP archive)
Extension	.zip
MIME type	application/zip
Size	512,000 bytes (500 KB)
Kind	Binary
Signature	50 4B 03 04
SHA-256	3f977498bfa0cfc3d65f367bf268bd17819e47e2cebdc3bc2bf666d099770570
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-500kb.zip 'https://sampletestfiles.com/downloads/zip/sample-zip-500kb.zip'
sha256sum sample-zip-500kb.zip     # Linux
shasum -a 256 sample-zip-500kb.zip # macOS

On Windows, run Get-FileHash sample-zip-500kb.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 500 KB?: Yes. It is 512,000 bytes, which is 500 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 500 KB ZIP file?: 4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 508,743 pseudo-random bytes stored without compression so the archive is exactly 512,000 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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