Getting Started with COSBrowser

Last updated: 2021-10-08 17:14:32

    If you are a first time user of COS, we recommend that you first read Bucket Overview, Object Overview, Specifications and Limits, and FAQs.

    COSBrowser is a visual interface tool launched by Tencent Cloud. It comes with multiple versions for Windows, macOS, Linux, Android, and iOS, allowing for a simpler easier way to view, transfer, and manage COS resources.
    This document will use the Windows version as an example to show you in detail how to create buckets, and upload, download, and share objects.


    1. The COS service is activated for your Tencent Cloud account. If not, please go to COS console and follow the instructions to activate it.
    2. You should log in to COSBrowser using an API key. First, go to the API Key management page to create one.

    Step 1. Download and install COSBrowser

    The COSBrowser Window Version can run on Windows 7 32/64-bit or above, and Windows Server 2008 R2 64 or above. To download other versions, go to COSBrowser Overview.

    Step 2. Login to COSBrowser

    Use your API Key to log in to COSBrowser.

    Step 3. Create a bucket

    1. After you logged in, click Create bucket in the upper-left corner of the COSBrowser.
    2. Enter your bucket information in the pop-up window.
      • Name: a user-defined bucket name, for example, examplebucket
      • Region: region where the bucket resides. Please select the region closest to you. For example, if you are in Shenzhen, you can select the Guangzhou region.
      • ACL: access permission for the bucket. For example, you can select Private (read-write).
    3. Click OK.

    Step 4. Upload an object

    1. Click the bucket created in Step 3 to go to the bucket management page.
    2. Click Upload > Select files and select a local file to upload to the bucket, for example, exampleobjext.txt.
    3. Click Upload.

    Step 5. Download an object

    Method 1

    1. Click in the top right of the COSBrowser page to switch to list view (This step can be skipped if you are already in list view).
    2. Under “Action” on the right side, click to download the file.

    Method 2

    1. Right-click a file, and in the drop-down list, click Advanced Download.
    2. The Advanced Download window will pop up where you can select "Rename", "Replace" or "Skip" as needed.
    3. Click Download now, and COSBrowser will begin downloading the file you selected.

    Step 6. Sharing an object

    Each file stored in COS can be accessed through a specific link. If a file is private-read, you can request a temporary signature to generate a temporary access link with a certain validity period. The two methods for generating object links are as follows:

    Method 1

    1. Click in the upper-right of the COSBrowser page to switch to list view (Skip this step if you are already in list view).
    2. In the action bar to the right of the file, click .
    3. Your link is generated and copied successfully if COSBrowser displays Temporary object url copy success, link effective for 2 hours at the top.
    4. You can now access your file via this link. File links generated in this way are valid for 2 hours. To customize the validity period, you can use Method 2.

    Method 2

    1. Click in the upper-right of the COSBrowser page to switch to list view (Skip this step if you are already in list view).
    2. Under Actions on the right side, click ..., and in the drop-down list, click Share.
    3. In the Copy link with expires pop-up window, configure your file link. If your file is Private read-write, select Copy url with signature…. Note that the link is valid for the period of time that you specify.
    4. Click Copy to copy the temporary file link, with which you can now access your file.

    More Features

    In addition to the above capabilities, COSBrowser has many more to offer, such as modifying bucket access permissions, file preview, etc. For more information, please see COSBrowser for Desktop.


    We are deeply sorry for any inconvenience you may have encountered when using the console. If you need to reach out, please contact us by submitting a ticket.


    To learn more about iOS- or Android-powered COSBrowser, see the following documents: