# Universal QR Code Generator
Generate downloadable QR code images from text or URLs.
## API Overview
- **HTTP Protocol:** HTTPS
- **HTTP Method:** POST
- **HTTP Endpoint:** https://api.gugudata.io/v1/qrcode
- **Response Type:** application/json; charset=utf-8
- **DEMO Endpoint:** https://api.gugudata.io/v1/qrcode/demo
- **Live Demo:** https://gugudata.io/demo/qrcode
- **Postman:** https://www.postman.com/gugudata/gugudata-io
- **LLM Page:** https://gugudata.io/details/qrcode/llm
- **Raw Markdown:** https://gugudata.io/details/qrcode/llm.md
## Remote MCP
- **MCP Endpoint:** https://mcp.gugudata.io/mcp
- **MCP Guide:** https://gugudata.io/mcp/
- **Authorization:** OAuth authorization opens in the browser; do not paste appkeys into MCP clients.
- **Tool Scope:** MCP clients receive GuGuData API tools available to the authorized account.
## Data & API Features
- Text to QR codes: Encode text exactly, including spaces and line breaks.
- Website links: Turn a URL into a static QR code for print or digital use.
- Multilingual content: Encode supported Unicode text for international workflows.
- Adjustable image size: Choose a square PNG size from 64 to 2048 pixels, subject to content capacity.
- Downloadable PNG files: Retrieve a public image link and save it in your application.
- Print and application workflows: Add QR generation to labels, onboarding and content workflows.
## API Request Parameters
| Name | Type | Is Required | Default Value | Remark |
| --- | --- | --- | --- | --- |
| appkey | string | true | YOUR_APPKEY | API key used to authenticate the request. |
| content | string | true | | Nonblank text or URL, preserved exactly including spaces and line breaks. At most 32768 UTF-8 bytes; QR capacity and selected size impose smaller limits. Shorten content or increase size when it cannot fit. |
| size | integer | false | 200 | Integer image width and height from 64 to 2048 pixels. Defaults to 200; fractions, strings and null are rejected. |
## API Response Parameters
| Name | Type | Remark |
| --- | --- | --- |
| url | string | Public HTTPS URL of the generated PNG. Download and save the file; permanent hosting is not guaranteed. HTTP 400 / business 400 for invalid input, HTTP 500 / business 500 for generation failure, and HTTP 503 / business 500 when image storage is unavailable. |
## API Response Status Codes
| Status Code | Explanation of Status Code | Remarks |
| --- | --- | --- |
| 200 | Request processed successfully. | Some endpoints expose a separate application-level status field in the response body, such as `dataStatus.statusCode`. |
| 400 | Invalid request parameters or request format. | Check required fields, data types, and request body format. |
| 401 | Missing or unknown application key. | Provide a valid `appkey` with the request. |
| 403 | The application key is recognized but access is not allowed. | The key may be expired, inactive, or not permitted for the requested API. |
| 429 | Request rate or trial usage limit exceeded. | Reduce request frequency and retry with backoff. If a trial allowance is exhausted, check Trial Keys for remaining requests and subscribe to continue. |
| 500 | Internal service error. | Retry later or contact support if the error persists. |
| 503 | Upstream service unavailable. | Retry later; the requested upstream dependency is temporarily unavailable. |
## cURL Example
```bash
curl --location 'https://api.gugudata.io/v1/qrcode?appkey=YOUR_APPKEY' --request POST --header 'Content-Type: application/json' --data '{
"content": "YOUR_VALUE",
"size": 200
}'
```