25 KB OBJ sample
An OBJ file of exactly 25,600 bytes. It is a valid Wavefront OBJ 3D model 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 OBJ file.
Download
sample-obj-25kb.obj
25 KB25,600 bytes
Download 25 KB OBJCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- model/obj
- SHA-256
869caec9b5fd1f80e05adcdd7882bc227119107e72a604e033c05daf4680c17f- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
One object, "terrain": a height field 16 vertices wide and 33 rows deep (528 vertices, 990 triangles), written as v and f statements. Comment lines at the end bring the file to the exact size.
| Vertices | 528 |
|---|---|
| Triangles | 990 |
| Objects | 1 |
| Materials | None |
| Encoding | UTF-8 (ASCII characters only) |
How the file begins
The opening lines of sample-obj-25kb.obj, exactly as they appear in the file.
00000000 23 20 53 61 6d 70 6c 65 54 65 73 74 46 69 6c 65 |# SampleTestFile|
00000010 73 20 73 61 6d 70 6c 65 20 4f 42 4a 20 66 69 6c |s sample OBJ fil|
00000020 65 20 28 32 35 20 4b 42 29 0a 23 20 41 20 74 72 |e (25 KB).# A tr|
00000030 69 61 6e 67 75 6c 61 74 65 64 20 68 65 69 67 68 |iangulated heigh|Preview
Shows the file contents.
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
- Load-testing viewers with large meshes
- Testing 3D model upload and preview
Testing notes for OBJ
- Face indices are one-based and can be negative, meaning relative to the end of the vertex list; importers written for zero-based arrays are off by one.
- OBJ has no unit of measurement, so the same file can appear at wildly different scales in different tools.
Technical details
| File name | sample-obj-25kb.obj |
|---|---|
| Format | OBJ (Wavefront OBJ 3D model) |
| Extension | .obj |
| MIME type | model/obj |
| Size | 25,600 bytes (25 KB) |
| Kind | Text |
| SHA-256 | 869caec9b5fd1f80e05adcdd7882bc227119107e72a604e033c05daf4680c17f |
| 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 | 3D Models |
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-obj-25kb.obj # Linux
shasum -a 256 sample-obj-25kb.obj # macOSOn Windows, run Get-FileHash sample-obj-25kb.obj -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 OBJ file?
- One object, "terrain": a height field 16 vertices wide and 33 rows deep (528 vertices, 990 triangles), written as v and f statements. Comment lines at the end bring the file to the exact size.
- What does the sample model look like?
- A gently rolling surface, like a patch of terrain, built from triangles. It has no materials or textures.