5 MB OBJ sample
An OBJ file of exactly 5,242,880 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 5 MB sample, test or dummy OBJ file.
Download
sample-obj-5mb.obj
5 MB5,242,880 bytes
Download 5 MB 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
657d745d1ca8c4f2706944cf53ecce00df49a97b6d3c117260930f2eee0856ca- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
One object, "terrain": a height field 241 vertices wide and 338 rows deep (81,458 vertices, 162,240 triangles), written as v and f statements. Comment lines at the end bring the file to the exact size.
| Vertices | 81,458 |
|---|---|
| Triangles | 162,240 |
| Objects | 1 |
| Materials | None |
| Encoding | UTF-8 (ASCII characters only) |
How the file begins
The opening lines of sample-obj-5mb.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 35 20 4d 42 29 0a 23 20 41 20 74 72 69 |e (5 MB).# A tri|
00000030 61 6e 67 75 6c 61 74 65 64 20 68 65 69 67 68 74 |angulated height|Preview
Creates the file in your browser and shows the first 64 KB of it.
Where 5 MB matters
A 5,242,880-byte file: the size of a phone photo and the minimum part size for S3 multipart uploads. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| PHP | 2 MB per uploaded file by default (upload_max_filesize) | A 5 MB upload fails on an untuned PHP installation. |
| Vercel Functions | 4.5 MB request body | Larger uploads must go directly to object storage. |
| Amazon S3 multipart upload | 5 MiB minimum part size | This file is exactly one minimum part. |
| AWS Lambda | 6 MB synchronous invocation payload | 5 MB of binary data exceeds it once base64-encoded. |
| Browser localStorage | About 5 MB per origin | Storing this file as text fills the quota. |
| Django | 2.5 MB in memory by default | Larger uploads are streamed to a temporary file instead of held in memory. |
Use this file for
- Finding the first upload limit in a new stack
- 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-5mb.obj |
|---|---|
| Format | OBJ (Wavefront OBJ 3D model) |
| Extension | .obj |
| MIME type | model/obj |
| Size | 5,242,880 bytes (5 MB) |
| Kind | Text |
| SHA-256 | 657d745d1ca8c4f2706944cf53ecce00df49a97b6d3c117260930f2eee0856ca |
| 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-5mb.obj # Linux
shasum -a 256 sample-obj-5mb.obj # macOSOn Windows, run Get-FileHash sample-obj-5mb.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 5 MB?
- Yes. It is 5,242,880 bytes, which is 5 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 5 MB OBJ file?
- One object, "terrain": a height field 241 vertices wide and 338 rows deep (81,458 vertices, 162,240 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.