25 KB GIF sample
A GIF file of exactly 25,600 bytes. It is a valid Graphics Interchange Format file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 25 KB sample, test or dummy GIF file.
Download
sample-gif-25kb.gif
25 KB25,600 bytes
Download 25 KB GIFCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- image/gif
- SHA-256
b987cc8d9b285e573bb86055f578e5eca45740424ca14e43eac5238754d6de79- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
A looping 480 × 360 animation of 1 LZW-compressed frames; the last frame repaints only the top of the canvas. 60 bytes of GIF comment extension bring the file to the exact size.
| Dimensions | 480 × 360 px |
|---|---|
| Frames | 1 |
| Frame delay | 80 ms |
| Loop | Forever |
| Colours | 256 (global colour table) |
| Version | GIF89a |
First bytes of the file
The first 64 bytes of sample-gif-25kb.gif as a hex dump: offset, bytes, then the same bytes as text. The GIF signature is 47 49 46 38 39 61.
00000000 47 49 46 38 39 61 e0 01 68 01 f7 00 00 00 00 00 |GIF89a..h.......|
00000010 00 00 33 00 00 66 00 00 99 00 00 cc 00 00 ff 00 |..3..f..........|
00000020 33 00 00 33 33 00 33 66 00 33 99 00 33 cc 00 33 |3..33.3f.3..3..3|
00000030 ff 00 66 00 00 66 33 00 66 66 00 66 99 00 66 cc |..f..f3.ff.f..f.|Preview
Creates the file in your browser and shows it here.
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. |
Use this file for
- Checking thumbnail and icon handling
- Testing avatar and reaction uploads
- Testing whether image pipelines preserve animation
Testing notes for GIF
- Many resizing libraries silently keep only the first frame of an animated GIF.
- Animated GIFs are large for what they show; a few seconds can reach several megabytes, so they hit size limits early.
Technical details
| File name | sample-gif-25kb.gif |
|---|---|
| Format | GIF (Graphics Interchange Format) |
| Extension | .gif |
| MIME type | image/gif |
| Size | 25,600 bytes (25 KB) |
| Kind | Binary |
| Signature | 47 49 46 38 39 61 |
| SHA-256 | b987cc8d9b285e573bb86055f578e5eca45740424ca14e43eac5238754d6de79 |
| 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 | Available on this page |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Images |
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-gif-25kb.gif # Linux
shasum -a 256 sample-gif-25kb.gif # macOSOn Windows, run Get-FileHash sample-gif-25kb.gif -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 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 GIF file?
- A looping 480 × 360 animation of 1 LZW-compressed frames; the last frame repaints only the top of the canvas. 60 bytes of GIF comment extension bring the file to the exact size.
- Are the sample GIFs animated?
- Yes. They loop forever at about 12 frames per second. The frame count for each size is shown on its download page.