500 KB GZ sample

A GZ file of exactly 512,000 bytes. It is a valid Gzip compressed file file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 500 KB sample, test or dummy GZ file.

sample-gz-500kb.gz

500 KB512,000 bytes

Download 500 KB GZ

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/gzip
SHA-256: 1920e012c344eb068623ccedf6306c463605e88d4a81292b47bbef60ac00ed44
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

One gzip member that expands to sample.log, 25,213 access-log lines (4,295,458 bytes). 4,141 bytes of text in the optional gzip header comment field bring the file to the exact size.

Compressed member	sample.log
Uncompressed size	4,295,458 bytes
Compression method	Deflate
Members	1
Original file name stored	Yes

First bytes of the file

The first 64 bytes of sample-gz-500kb.gz as a hex dump: offset, bytes, then the same bytes as text. The GZ signature is 1F 8B 08.

00000000  1f 8b 08 18 00 b9 55 69  00 03 73 61 6d 70 6c 65 |......Ui..sample|
00000010  2e 6c 6f 67 00 53 61 6d  70 6c 65 54 65 73 74 46 |.log.SampleTestF|
00000020  69 6c 65 73 20 73 61 6d  70 6c 65 20 61 72 63 68 |iles sample arch|
00000030  69 76 65 2e 20 41 6c 69  67 6e 6d 65 6e 74 20 70 |ive. Alignment p|

Preview

GZ files cannot be shown in a browser. Download the file and open it in an application that reads GZ, such as gzip and gunzip.

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

Checking email size handling
Testing streaming decompression
Testing decompression of uploads and log archives

Testing notes for GZ

A small .gz can decompress to gigabytes. Stream and cap the output rather than inflating it into memory.
If a server sends a .gz file with Content-Encoding: gzip, the client transparently decompresses it and saves a file whose content does not match its name.

GZ format reference

Technical details

File name	sample-gz-500kb.gz
Format	GZ (Gzip compressed file)
Extension	.gz
MIME type	application/gzip
Size	512,000 bytes (500 KB)
Kind	Binary
Signature	1F 8B 08
SHA-256	1920e012c344eb068623ccedf6306c463605e88d4a81292b47bbef60ac00ed44
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	Archives

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-gz-500kb.gz     # Linux
shasum -a 256 sample-gz-500kb.gz # macOS

On Windows, run Get-FileHash sample-gz-500kb.gz -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 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 GZ file?: One gzip member that expands to sample.log, 25,213 access-log lines (4,295,458 bytes). 4,141 bytes of text in the optional gzip header comment field bring the file to the exact size.
What do the sample .gz files decompress to?: A text file named sample.log containing web-server access log lines. The uncompressed size is shown on each download page.

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