1 KB PNG sample file
A PNG file of exactly 1,024 bytes. It is a valid Portable Network Graphics file, generated for this site and checked with an independent parser.
Download
- Type
- image/png
- SHA-256
0996aa2a138dc6e0d608f0c210e04bed13b7d32d687480732ac669c2f1e2b391- Direct URL
https://sampletestfiles.com/downloads/png/sample-png-1kb.png
What is in this file
A 21 × 14 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 60 bytes of tEXt comment chunk bring the file to the exact size.
| Dimensions | 21 × 14 px |
|---|---|
| Colour type | Truecolour RGB, 8 bits per channel |
| Transparency | No |
| Compression | Deflate stream of stored blocks |
| Interlaced | No |
First bytes of the file
The first 64 bytes of sample-png-1kb.png as a hex dump: offset, bytes, then the same bytes as text. The PNG signature is 89 50 4E 47 0D 0A 1A 0A.
00000000 89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 |.PNG........IHDR|
00000010 00 00 00 15 00 00 00 0e 08 02 00 00 00 4f 64 c0 |.............Od.|
00000020 99 00 00 00 30 74 45 58 74 43 6f 6d 6d 65 6e 74 |....0tEXtComment|
00000030 00 53 61 6d 70 6c 65 54 65 73 74 46 69 6c 65 73 |.SampleTestFiles|Preview
Displays the file in your browser.
Where 1 KB matters
The smallest practical test file: 1,024 bytes, small enough to travel in a single network packet. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Ethernet | 1,500 bytes (typical MTU) | A 1 KB payload fits in one packet with its headers. |
| Browser cookies | 4,096 bytes per cookie | 1 KB is well inside the limit; the 5 KB sample is over it. |
Use this file for
- Smoke tests in CI that must run in milliseconds
- Testing image uploads that must stay lossless
- Checking transparency handling
Testing notes for PNG
- PNG compresses flat colour extremely well, so a tiny file can expand to a very large bitmap. Check dimensions before decoding.
- Converting a transparent PNG to JPEG needs a background colour; pipelines that forget produce black backgrounds.
Technical details
| File name | sample-png-1kb.png |
|---|---|
| Format | PNG (Portable Network Graphics) |
| Extension | .png |
| MIME type | image/png |
| Size | 1,024 bytes (1 KB) |
| Kind | Binary |
| Signature | 89 50 4E 47 0D 0A 1A 0A |
| SHA-256 | 0996aa2a138dc6e0d608f0c210e04bed13b7d32d687480732ac669c2f1e2b391 |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Available on this page |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Images |
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-png-1kb.png 'https://sampletestfiles.com/downloads/png/sample-png-1kb.png'
sha256sum sample-png-1kb.png # Linux
shasum -a 256 sample-png-1kb.png # macOSOn Windows, run Get-FileHash sample-png-1kb.png -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 KB?
- Yes. It is 1,024 bytes, which is 1 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 KB PNG file?
- A 21 × 14 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 60 bytes of tEXt comment chunk bring the file to the exact size.
- Why are the sized PNG samples stored without compression?
- It makes the size exact and predictable: the pixel data is written in uncompressed deflate blocks, so byte count follows pixel count. The files are fully valid PNGs. For a normally compressed PNG, use the 1920 × 1080 test card.