A PNG file of exactly 25 MB
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Free download（25 MB）
threshold-png-25-0mb.png
File info
| File Format | PNG |
|---|---|
| File Size | 25 MB（26,214,400 bytes） |
| MIME Type | image/png |
| MD5 | 59f21ff3988996d97df22f86591191f1 |
| SHA-1 | d64bce9349277a723144646e5bed00094883613d |
| SHA-256 | d4b43a8062788c4dc50c7a71c96dd56a0b5aab998409ed041b8e8bec7f83b5f0 |
Download via command line
curl
curl -O https://devlab.itlibra.com/files/threshold/png/threshold-png-25-0mb.png
wget
wget https://devlab.itlibra.com/files/threshold/png/threshold-png-25-0mb.png
PowerShell
Invoke-WebRequest -Uri "https://devlab.itlibra.com/files/threshold/png/threshold-png-25-0mb.png" -OutFile "threshold-png-25-0mb.png"
About this file
This file is trimmed to an exact byte count (26,214,400 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.