API Documentation

VR Cooperative exposes its tools as API endpoints so you can integrate them into your own workflows, scripts, and applications. All endpoints are free to use with reasonable rate limits.

Image Tools API

Resize images, compress to different formats, and generate full favicon sets from a source image. This is the same processing engine behind the Image Tools page, available as a direct HTTP endpoint.

Endpoint

POST  /ImageToolsApi.ashx

Send a multipart/form-data request with the source image and processing options.

Parameters

Response

The response format depends on how many files are generated:

Favicon set contents

When generating favicons, the output includes:

• favicon.ico - multi-size ICO (16, 32, 48 px)
• favicon-16x16.png
• favicon-32x32.png
• apple-touch-icon.png - 180 px
• android-chrome-192x192.png
• android-chrome-512x512.png
• mstile-150x150.png - 150 px

Limits

Error Responses

Errors are returned as JSON with an error field and an appropriate HTTP status code:

{ "error": "description of what went wrong" }

Examples

Resize an image (curl)

curl -X POST https://vrcooperative.com/ImageToolsApi.ashx \
  -F "image=@photo.png" \
  -F "action=resize" \
  -F "width=800" \
  -F "format=jpg" \
  -F "quality=90" \
  -o resized.jpg

Generate favicons (curl)

curl -X POST https://vrcooperative.com/ImageToolsApi.ashx \
  -F "image=@logo.png" \
  -F "action=favicon" \
  -o favicons.zip

Resize + favicons (PowerShell)

$form = @{
    image  = Get-Item ".\logo.png"
    action = "both"
    width  = "1200"
    format = "png"
}

Invoke-RestMethod `
    -Uri "https://vrcooperative.com/ImageToolsApi.ashx" `
    -Method Post `
    -Form $form `
    -OutFile "imagetools-output.zip"

VRAM Budget Calculator API

Calculate the video memory (VRAM) cost of your Unity textures and get an estimated VRChat performance rank for both PC and Quest. No file upload needed - just describe your textures as JSON.

Endpoint

POST  /VramCalculatorApi.ashx

Send a JSON body with Content-Type: application/json.

Request Body

A JSON object with a textures array (max 200 entries):

Supported Texture Formats

Send an unknown format to get the full list of supported format names in the error response.

VRAM Calculator Response

Returns a JSON object with per-texture breakdowns, totals, and estimated VRChat performance ranks for PC and Quest.

{
  "textures": [
    {
      "name": "Body Diffuse",
      "width": 2048,
      "height": 2048,
      "format": "DXT5",
      "mipmaps": true,
      "bitsPerPixel": 8.0,
      "vramBytes": 5592406,
      "vramFormatted": "5.33 MB"
    }
  ],
  "totalVramBytes": 5592406,
  "totalVramFormatted": "5.33 MB",
  "pcRank": "Excellent",
  "questRank": "Good"
}

Performance rank thresholds are approximate community guidelines and may differ from VRChat's current values. Check VRChat's official documentation for the latest thresholds.

Rate limit

1 request per 2 seconds per IP address. Returns 429 with Retry-After: 2 if exceeded.

VRAM Calculator Examples

Calculate avatar texture budget (curl)

curl -X POST https://vrcooperative.com/VramCalculatorApi.ashx \
  -H "Content-Type: application/json" \
  -d '{
    "textures": [
      { "name": "Body Diffuse", "width": 2048, "height": 2048, "format": "DXT5" },
      { "name": "Body Normal",  "width": 2048, "height": 2048, "format": "BC5" },
      { "name": "Hair Diffuse", "width": 1024, "height": 1024, "format": "DXT5" },
      { "name": "Hair Normal",  "width": 1024, "height": 1024, "format": "BC5" },
      { "name": "Eyes",         "width": 512,  "height": 512,  "format": "DXT1" }
    ]
  }'

PowerShell

$body = @{
    textures = @(
        @{ name = "Body"; width = 2048; height = 2048; format = "DXT5" }
        @{ name = "Hair"; width = 1024; height = 1024; format = "DXT5" }
    )
} | ConvertTo-Json

Invoke-RestMethod `
    -Uri "https://vrcooperative.com/VramCalculatorApi.ashx" `
    -Method Post `
    -ContentType "application/json" `
    -Body $body