3 MB ZIP sample
A ZIP file of exactly 3,145,728 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 3 MB sample, test or dummy ZIP file.
Download
sample-zip-3mb.zip
3 MB3,145,728 bytes
Download 3 MB ZIPCreated in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.
- Type
- application/zip
- SHA-256
85ab280bb9212b1613980ed033db5e6c5db19a83bc5c5ab45fa4e8314f9cdaf6- 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, 3,141,878 pseudo-random bytes stored without compression so the archive is exactly 3,145,728 bytes.
| Entries | 4 |
|---|---|
| Compression | Deflate for text entries, stored for payload.bin |
| Encrypted | No |
| ZIP64 | No |
| Largest entry | payload.bin, 3,141,878 bytes |
First bytes of the file
The first 64 bytes of sample-zip-3mb.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 3 MB matters
A 3,145,728-byte file, 3 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.
Use this file for
- Finding out whether a 1 MB default has been raised
- 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.
Technical details
| File name | sample-zip-3mb.zip |
|---|---|
| Format | ZIP (ZIP archive) |
| Extension | .zip |
| MIME type | application/zip |
| Size | 3,145,728 bytes (3 MB) |
| Kind | Binary |
| Signature | 50 4B 03 04 |
| SHA-256 | 85ab280bb9212b1613980ed033db5e6c5db19a83bc5c5ab45fa4e8314f9cdaf6 |
| 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-3mb.zip # Linux
shasum -a 256 sample-zip-3mb.zip # macOSOn Windows, run Get-FileHash sample-zip-3mb.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 3 MB?
- Yes. It is 3,145,728 bytes, which is 3 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 3 MB ZIP file?
- 4 entries: a README, a CSV file and a JSON file compressed with deflate, plus payload.bin, 3,141,878 pseudo-random bytes stored without compression so the archive is exactly 3,145,728 bytes.
- Are the archives encrypted?
- No. They are not encrypted or password-protected and do not use ZIP64.