Source: Roblox Creator Hub · CC BY 4.0 · View source · Code samples: MIT Imported 2026-10-03. Formatting adapted for this site.
POST /thumbnail-personalization-api/v1/universes/{universeId}/thumbnails/uploads — openapi
Uploads one or more images to create homepage thumbnails for a universe.
Endpoint
Method: POST
Path: /thumbnail-personalization-api/v1/universes/{universeId}/thumbnails/uploads
Servers:
https://apis.roblox.com
Parameters
| Name | Location | Required | Description |
|---|---|---|---|
| universeId | path | true | The identifier of the universe that owns the thumbnails. |
[
{
"name": "universeId",
"in": "path",
"description": "The identifier of the universe that owns the thumbnails.",
"required": true,
"schema": {
"type": "integer",
"format": "int64"
}
}
]Request Body
{
"content": {
"multipart/form-data": {
"schema": {
"required": [
"files"
],
"type": "object",
"properties": {
"files": {
"type": "array",
"items": {
"type": "string",
"format": "binary"
}
}
}
},
"encoding": {
"files": {
"style": "form"
}
}
}
},
"required": true
}Responses
| Status | Description |
|---|---|
| 200 | Success |
| 400 | Bad Request |
| 401 | Unauthorized |
| 403 | Forbidden |
| 500 | Server Error |
{
"200": {
"description": "Success",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/UploadThumbnailsResponse"
}
}
}
},
"400": {
"description": "Bad Request",
"content": {
"application/json": {
"schema": {
"type": "string"
}
}
}
},
"401": {
"description": "Unauthorized",
"content": {
"application/json": {
"schema": {
"type": "string"
}
}
}
},
"403": {
"description": "Forbidden",
"content": {
"application/json": {
"schema": {
"type": "string"
}
}
}
},
"500": {
"description": "Server Error"
}
}Authentication
{
"security": [
{
"roblox-legacy-cookie": []
},
{
"roblox-api-key": []
},
{
"roblox-oauth2": [
"universe.thumbnail:write"
]
}
],
"securitySchemes": {
"roblox-api-key": {
"type": "apiKey",
"description": "A configurable key that allows granular access to Roblox resources. See https://create.roblox.com/docs/cloud/auth/api-keys for more information.",
"name": "x-api-key",
"in": "header"
},
"roblox-legacy-cookie": {
"type": "apiKey",
"description": "A browser cookie that represents the identity of a Roblox user. DO NOT SHARE THIS. Sharing this will allow someone to log in as you and to steal your Robux and items. We do not recommend using cookies to call endpoints. When possible, use API keys with the x-api-key header or OAuth 2.0 instead for authentication.",
"in": "cookie",
"name": ".ROBLOSECURITY"
},
"roblox-oauth2": {
"type": "oauth2",
"description": "Build or authorize apps to access Roblox resources. See https://create.roblox.com/docs/cloud/auth/oauth2-overview for more information.",
"flows": {
"authorizationCode": {
"authorizationUrl": "https://apis.roblox.com/oauth/v1/authorize",
"tokenUrl": "https://apis.roblox.com/oauth/v1/token",
"refreshUrl": "https://apis.roblox.com/oauth/v1/token",
"scopes": {}
}
}
}
}
}Related Schemas
Complete Operation Definition
{
"tags": [
"Thumbnail Personalization"
],
"summary": "Uploads one or more images to create homepage thumbnails for a universe.",
"operationId": "ThumbnailPersonalizationApi.HomepageThumbnail_UploadHomepageThumbnails",
"parameters": [
{
"name": "universeId",
"in": "path",
"description": "The identifier of the universe that owns the thumbnails.",
"required": true,
"schema": {
"type": "integer",
"format": "int64"
}
}
],
"requestBody": {
"content": {
"multipart/form-data": {
"schema": {
"required": [
"files"
],
"type": "object",
"properties": {
"files": {
"type": "array",
"items": {
"type": "string",
"format": "binary"
}
}
}
},
"encoding": {
"files": {
"style": "form"
}
}
}
},
"required": true
},
"responses": {
"200": {
"description": "Success",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/UploadThumbnailsResponse"
}
}
}
},
"400": {
"description": "Bad Request",
"content": {
"application/json": {
"schema": {
"type": "string"
}
}
}
},
"401": {
"description": "Unauthorized",
"content": {
"application/json": {
"schema": {
"type": "string"
}
}
}
},
"403": {
"description": "Forbidden",
"content": {
"application/json": {
"schema": {
"type": "string"
}
}
}
},
"500": {
"description": "Server Error"
}
},
"x-roblox-stability": "EXPERIMENTAL",
"x-roblox-rate-limits": {
"perApiKeyOwner": {
"period": "MINUTE",
"maxInPeriod": 50
},
"perOauth2Authorization": {
"period": "MINUTE",
"maxInPeriod": 50
}
},
"x-roblox-scopes": [
{
"name": "universe.thumbnail:write",
"targetResourceSpecifier": "universes",
"firstPartyOAuthOnly": true
}
],
"x-roblox-engine-usability": {
"apiKeyWithHttpService": false
},
"security": [
{
"roblox-legacy-cookie": []
},
{
"roblox-api-key": []
},
{
"roblox-oauth2": [
"universe.thumbnail:write"
]
}
],
"externalDocs": {
"url": "https://create.roblox.com/docs/cloud/reference/features/thumbnail-personalization#ThumbnailPersonalizationApi.HomepageThumbnail_UploadHomepageThumbnails"
}
}