30 MB ZIP sample

A ZIP file of exactly 31,457,280 bytes. It is a valid ZIP archive file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 30 MB sample, test or dummy ZIP file.

sample-zip-30mb.zip

30 MB31,457,280 bytes

Download 30 MB ZIP

Created in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.

Type: application/zip
SHA-256: 3da39e1a4caa56b2b2acf26f061537bc748539d7f6b64a277d37b7c45b12ff15
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 31,453,430 pseudo-random bytes stored without compression so the archive is exactly 31,457,280 bytes.

Entries	4
Compression	Deflate for text entries, stored for payload.bin
Encrypted	No
ZIP64	No
Largest entry	payload.bin, 31,453,430 bytes

First bytes of the file

The first 64 bytes of sample-zip-30mb.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 2a e6 |PK..........!\*.|
00000010  3b 63 6e 00 00 00 7b 00  00 00 0a 00 00 00 52 45 |;cn...{.......RE|
00000020  41 44 4d 45 2e 74 78 74  0a 4e cc 2d c8 49 0d 49 |ADME.txt.N.-.I.I|
00000030  2d 2e 71 cb cc 49 2d 56  28 06 f3 15 a2 3c 03 14 |-.q..I-V(....<..|

Preview

ZIP files cannot be shown in a browser. Download the file and open it in an application that reads ZIP, such as Windows Explorer, macOS Archive Utility, 7-Zip.

Where 30 MB matters

A 31,457,280-byte file, 30 MB in the binary units that operating systems and upload limits use. It is useful wherever a form, an API gateway, a storage quota or a mail server is configured with a limit of about this size.

All 30 MB sample files

Use this file for

Testing email attachment limits
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-30mb.zip
Format	ZIP (ZIP archive)
Extension	.zip
MIME type	application/zip
Size	31,457,280 bytes (30 MB)
Kind	Binary
Signature	50 4B 03 04
SHA-256	3da39e1a4caa56b2b2acf26f061537bc748539d7f6b64a277d37b7c45b12ff15
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-zip-30mb.zip     # Linux
shasum -a 256 sample-zip-30mb.zip # macOS

On Windows, run Get-FileHash sample-zip-30mb.zip -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 30 MB?: Yes. It is 31,457,280 bytes, which is 30 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 30 MB ZIP file?: 4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 31,453,430 pseudo-random bytes stored without compression so the archive is exactly 31,457,280 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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