100 MB GZ sample

A GZ file of exactly 104,857,600 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 100 MB sample, test or dummy GZ file.

sample-gz-100mb.gz

100 MB104,857,600 bytes

Download 100 MB GZ

Created in your browser and, in browsers that can stream to disk, sent straight to your downloads list; this can take a minute. No sign-up.

Type: application/gzip
SHA-256: 6872d43253fd6cc0c408f231ab3c40cdddc4772d67a54cf573b7506344009945
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

Two gzip members. The first expands to sample.log, 5,182,746 access-log lines (885,429,718 bytes). The second is empty and carries 586,019 bytes of text in its header comment field, which brings the file to the exact size. Decompressing gives the log.

Members	2 (the second is empty)
Uncompressed size	885,429,718 bytes
Compression method	Deflate
Original file name stored	Yes

First bytes of the file

The first 64 bytes of sample-gz-100mb.gz as a hex dump: offset, bytes, then the same bytes as text. The GZ signature is 1F 8B 08.

00000000  1f 8b 08 08 00 b9 55 69  00 03 73 61 6d 70 6c 65 |......Ui..sample|
00000010  2e 6c 6f 67 00 32 b4 b4  d0 33 35 d4 33 34 30 d0 |.log.2...35.340.|
00000020  33 56 d0 05 c2 68 03 43  7d af c4 3c 7d 23 03 23 |3V...h.C}..<}#.#|
00000030  33 2b 03 03 08 52 d0 36  00 82 58 05 25 77 d7 10 |3+...R.6..X.%w..|

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 100 MB matters

A 104,857,600-byte file: the request-body limit of Cloudflare's Free and Pro plans, and the size above which GitHub rejects a file outright.

All 100 MB sample files

Use this file for

Measuring download speed from your own server or CDN
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-100mb.gz
Format	GZ (Gzip compressed file)
Extension	.gz
MIME type	application/gzip
Size	104,857,600 bytes (100 MB)
Kind	Binary
Signature	1F 8B 08
SHA-256	6872d43253fd6cc0c408f231ab3c40cdddc4772d67a54cf573b7506344009945
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-100mb.gz     # Linux
shasum -a 256 sample-gz-100mb.gz # macOS

On Windows, run Get-FileHash sample-gz-100mb.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 100 MB?: Yes. It is 104,857,600 bytes, which is 100 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 100 MB GZ file?: Two gzip members. The first expands to sample.log, 5,182,746 access-log lines (885,429,718 bytes). The second is empty and carries 586,019 bytes of text in its header comment field, which brings the file to the exact size. Decompressing gives the log.
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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