5 MB GZ sample file

A GZ file of exactly 5,242,880 bytes. It is a valid Gzip compressed file file, generated for this site and checked with an independent parser.

sample-gz-5mb.gz

5 MB5,242,880 bytes

Download 5 MB GZ

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Type: application/gzip
SHA-256: cf99edec045969df2cbf388c85e4e5de9c1736e95ae85c4deb5762ceb9632c76
Direct URL: https://sampletestfiles.com/downloads/gz/sample-gz-5mb.gz

What is in this file

One gzip member that expands to sample.log, 372,081 access-log lines (61,140,408 bytes). 17,230 bytes of text in the optional gzip header comment field bring the file to the exact size.

Compressed member	sample.log
Uncompressed size	61,140,408 bytes
Compression method	Deflate
Members	1
Original file name stored	Yes

First bytes of the file

The first 64 bytes of sample-gz-5mb.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 ff 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 with gzip and gunzip.

Where 5 MB matters

A 5,242,880-byte file: the size of a phone photo and the minimum part size for S3 multipart uploads. These are the default limits a file of this size is useful for testing:

System	Limit	Note
PHP	2 MB per uploaded file by default (upload_max_filesize)	A 5 MB upload fails on an untuned PHP installation.
Vercel Functions	4.5 MB request body	Larger uploads must go directly to object storage.
Amazon S3 multipart upload	5 MiB minimum part size	This file is exactly one minimum part.
AWS Lambda	6 MB synchronous invocation payload	5 MB of binary data exceeds it once base64-encoded.
Browser localStorage	About 5 MB per origin	Storing this file as text fills the quota.
Django	2.5 MB in memory by default	Larger uploads are streamed to a temporary file instead of held in memory.

All 5 MB sample files

Use this file for

Simulating photo uploads from phones
Testing streaming decompression
Testing decompression of uploads and log archives

Testing notes for GZ

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.
A small .gz can decompress to gigabytes. Stream and cap the output rather than inflating it into memory.

GZ format reference

Technical details

File name	sample-gz-5mb.gz
Format	GZ (Gzip compressed file)
Extension	.gz
MIME type	application/gzip
Size	5,242,880 bytes (5 MB)
Kind	Binary
Signature	1F 8B 08
SHA-256	cf99edec045969df2cbf388c85e4e5de9c1736e95ae85c4deb5762ceb9632c76
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-gz-5mb.gz 'https://sampletestfiles.com/downloads/gz/sample-gz-5mb.gz'
sha256sum sample-gz-5mb.gz     # Linux
shasum -a 256 sample-gz-5mb.gz # macOS

On Windows, run Get-FileHash sample-gz-5mb.gz -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 5 MB?: Yes. It is 5,242,880 bytes, which is 5 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 5 MB GZ file?: One gzip member that expands to sample.log, 372,081 access-log lines (61,140,408 bytes). 17,230 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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