25 KB PNG sample file

A PNG file of exactly 25,600 bytes. It is a valid Portable Network Graphics file, generated for this site and checked with an independent parser.

sample-png-25kb.png

25 KB25,600 bytes

Download 25 KB PNG

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Type: image/png
SHA-256: aa9bdbe8c2a18a23c9aced2465ace4b92b6b3eb632f763bea6ba66ab17d36542
Direct URL: https://sampletestfiles.com/downloads/png/sample-png-25kb.png

What is in this file

A 106 × 79 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 331 bytes of tEXt comment chunk bring the file to the exact size.

Dimensions	106 × 79 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-25kb.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 6a 00 00 00 4f 08 02 00 00 00 8c 22 c7  |...j...O......".|
00000020  45 00 00 01 3f 74 45 58 74 43 6f 6d 6d 65 6e 74  |E...?tEXtComment|
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 25 KB matters

A 25,600-byte file: the size of a small web image or a short document. These are the default limits a file of this size is useful for testing:

System	Limit	Note
TCP initial congestion window	About 14.6 KB (10 segments)	25 KB needs at least two flights of packets on a new connection.
Base64 encoding	Adds 33 percent	A 25 KB file becomes about 34 KB inside JSON or an email.

All 25 KB sample files

Use this file for

Testing avatar and logo uploads
Verifying dimension limits
Testing image uploads that must stay lossless

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.

PNG format reference

Technical details

File name	sample-png-25kb.png
Format	PNG (Portable Network Graphics)
Extension	.png
MIME type	image/png
Size	25,600 bytes (25 KB)
Kind	Binary
Signature	89 50 4E 47 0D 0A 1A 0A
SHA-256	aa9bdbe8c2a18a23c9aced2465ace4b92b6b3eb632f763bea6ba66ab17d36542
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-25kb.png 'https://sampletestfiles.com/downloads/png/sample-png-25kb.png'
sha256sum sample-png-25kb.png     # Linux
shasum -a 256 sample-png-25kb.png # macOS

On Windows, run Get-FileHash sample-png-25kb.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 25 KB?: Yes. It is 25,600 bytes, which is 25 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 25 KB PNG file?: A 106 × 79 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 331 bytes of tEXt comment chunk bring the file to the exact size.
Is there a sample with transparency?: Yes. The curated library includes a 512 × 512 PNG with an alpha gradient.

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