---
id: "en/api-get-api-file-downloadthumbnail-do"
title: "Get download file thumbnail address"
language: "en"
description: "GET /api/file/downloadThumbnail.do: Get the download file thumbnail address. Interface description, including path, method, parameters and return information."
canonical_url: "https://www.babel.cc/public/babelwiki/en/api-get-api-file-downloadthumbnail-do.html"
markdown_url: "https://www.babel.cc/public/babelwiki/ai/en/api-get-api-file-downloadthumbnail-do.md"
alternates: {"en": "https://www.babel.cc/public/babelwiki/ai/en/api-get-api-file-downloadthumbnail-do.md", "zh": "https://www.babel.cc/public/babelwiki/ai/zh/api-get-api-file-downloadthumbnail-do.md"}
reading_note: "文档记录不等于当前部署能力；以实际版本、授权模块与配置为准。保留原文的可选、限制及待确认说明，勿补猜接口。 / Documentation is not a guarantee for every deployment. Preserve optional-module requirements, limitations and unresolved API contracts."
---

# Get download file thumbnail address

`GET /api/file/downloadThumbnail.do`

## URL query parameters

| Parameter | Type | Description |
| --- | --- | --- |
| `fileId` | `string` | Required file ID |
| `version` | `number` | Optional version |
| `size` | `number` | Thumbnail size: maximum of width and height |

## Response

Fields listed in the source: `code`, `success`, `url`.

This endpoint returns a thumbnail, not a multi-file archive. The duplicated sentence in the source PDF is not applicable here.

## Calling the Endpoint

Use `Authorization: Bearer <access_token>`. GET parameters belong in the URL query; normal business POST requests use JSON. Check HTTP status and then the business result. Confirm array serialization and ambiguous types with the deployment instead of inventing fields.

[Authentication](https://www.babel.cc/public/babelwiki/en/developer-api-auth.html) · [API overview](https://www.babel.cc/public/babelwiki/en/developer-api-overview.html)