1 MB GZ sample file
A GZ file of exactly 1,048,576 bytes. It is a valid Gzip compressed file file, generated for this site and checked with an independent parser.
Download
- Type
- application/gzip
- SHA-256
549fcc27c4d808678837c97b64b560537113d7dcb8f7190c2d18f3b58005667b- Direct URL
https://sampletestfiles.com/downloads/gz/sample-gz-1mb.gz
What is in this file
One gzip member that expands to sample.log, 74,476 access-log lines (12,226,979 bytes). 2,076 bytes of text in the optional gzip header comment field bring the file to the exact size.
| Compressed member | sample.log |
|---|---|
| Uncompressed size | 12,226,979 bytes |
| Compression method | Deflate |
| Members | 1 |
| Original file name stored | Yes |
First bytes of the file
The first 64 bytes of sample-gz-1mb.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 1 MB matters
A 1,048,576-byte file: exactly the default upload limit of nginx, Spring Boot and Next.js. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| nginx | 1 MB by default (client_max_body_size) | A multipart upload of this file exceeds the limit by the size of the form boundaries. |
| Spring Boot multipart | 1 MB per file by default (max-file-size) | A file of exactly 1 MB is at the limit. |
| Next.js API routes and Server Actions | 1 MB by default | Larger bodies need the size limit raised in configuration. |
| Cloud Firestore documents | 1 MiB (1,048,576 bytes) | The same number of bytes as this file. |
| Apache Kafka messages | About 1 MB by default | Brokers reject larger records unless message.max.bytes is raised. |
Use this file for
- Download tests on mobile connections
- Checking Content-Encoding handling in HTTP clients
- Testing streaming decompression
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.
Technical details
| File name | sample-gz-1mb.gz |
|---|---|
| Format | GZ (Gzip compressed file) |
| Extension | .gz |
| MIME type | application/gzip |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Binary |
| Signature | 1F 8B 08 |
| SHA-256 | 549fcc27c4d808678837c97b64b560537113d7dcb8f7190c2d18f3b58005667b |
| 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-1mb.gz 'https://sampletestfiles.com/downloads/gz/sample-gz-1mb.gz'
sha256sum sample-gz-1mb.gz # Linux
shasum -a 256 sample-gz-1mb.gz # macOSOn Windows, run Get-FileHash sample-gz-1mb.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 1 MB?
- Yes. It is 1,048,576 bytes, which is 1 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 MB GZ file?
- One gzip member that expands to sample.log, 74,476 access-log lines (12,226,979 bytes). 2,076 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.