100 MB OBJ sample

An OBJ file of exactly 104,857,600 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 100 MB sample, test or dummy OBJ file.

sample-obj-100mb.obj

100 MB104,857,600 bytes

Download 100 MB OBJ

Created in your browser and, in browsers that can stream to disk, sent straight to your downloads list; this can take a minute. No sign-up.

Type: model/obj
SHA-256: ed0c2e0dce9a4c8f5747e97a00b61281b921a9a9b5a04ed0304d478281f30284
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

One object, "terrain": a height field 512 vertices wide and 2,769 rows deep (1,417,728 vertices, 2,829,918 triangles), written as v and f statements. Comment lines at the end bring the file to the exact size.

Vertices	1,417,728
Triangles	2,829,918
Objects	1
Materials	None
Encoding	UTF-8 (ASCII characters only)

How the file begins

The opening lines of sample-obj-100mb.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 31 30 30 20 4d  42 29 0a 23 20 41 20 74 |e (100 MB).# A t|
00000030  72 69 61 6e 67 75 6c 61  74 65 64 20 68 65 69 67 |riangulated heig|

Preview

Creates the file in your browser and shows the first 64 KB of it.

Where 100 MB matters

A 104,857,600-byte file: the request-body limit of Cloudflare's Free and Pro plans, and the size above which GitHub rejects a file outright.

All 100 MB sample files

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.

OBJ format reference

Technical details

File name	sample-obj-100mb.obj
Format	OBJ (Wavefront OBJ 3D model)
Extension	.obj
MIME type	model/obj
Size	104,857,600 bytes (100 MB)
Kind	Text
SHA-256	ed0c2e0dce9a4c8f5747e97a00b61281b921a9a9b5a04ed0304d478281f30284
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-100mb.obj     # Linux
shasum -a 256 sample-obj-100mb.obj # macOS

On Windows, run Get-FileHash sample-obj-100mb.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 100 MB?: Yes. It is 104,857,600 bytes, which is 100 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 100 MB OBJ file?: One object, "terrain": a height field 512 vertices wide and 2,769 rows deep (1,417,728 vertices, 2,829,918 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.

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