A PNG file of exactly 24.9 MB
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Free download（24.9 MB）
threshold-png-24-9mb.png
File info
| File Format | PNG |
|---|---|
| File Size | 24.9 MB（26,109,542 bytes） |
| MIME Type | image/png |
| MD5 | 86037695a117a2650ebfe05868ab343c |
| SHA-1 | 5d584c30f2175a242be40bda44f16452992ef928 |
| SHA-256 | c2ac3eefb65fd2cd692f14a271c9b8e4898c26f4f4075fe1fd0625e79387eb11 |
Download via command line
curl
curl -O https://devlab.itlibra.com/files/threshold/png/threshold-png-24-9mb.png
wget
wget https://devlab.itlibra.com/files/threshold/png/threshold-png-24-9mb.png
PowerShell
Invoke-WebRequest -Uri "https://devlab.itlibra.com/files/threshold/png/threshold-png-24-9mb.png" -OutFile "threshold-png-24-9mb.png"
About this file
This file is trimmed to an exact byte count (26,109,542 bytes) so it can be used for boundary-value testing against an upload limit.
What boundary-value testing is
Boundary-value testing rests on the observation that defects cluster just inside, exactly at, and just outside a limit. For file size, trying only three points — just under, exactly at, and just over the cap — is enough to reveal whether a comparison uses < or <=, and whether the unit maths is based on 1000 or 1024.
The same format is offered as 9.9 / 10.0 / 10.1 MB and 24.9 / 25.0 / 25.1 MB sets. 10 MB and 25 MB are the boundaries you meet most often, as form and CMS defaults and as the Gmail attachment cap respectively.
FAQ
- Is this file free to use?
- Yes — fully free and no signup required. Use it for any commercial or non-commercial test/verification purpose.
- What is inside the file?
- Dummy data generated for testing — sized to match the listed size exactly.
- What are the hash values for?
- Verify integrity after download or use them as test data for hashing libraries.