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Resize Images

Made by Firebase

Resizes images uploaded to Cloud Storage to a specified size, and optionally keeps or deletes the original image.


Use this extension to create resized versions of an image uploaded to a Cloud Storage bucket.

When you upload an image file to your specified Cloud Storage bucket, this extension:

  • Creates a resized image with your specified dimensions.
  • Names the resized image using the same name as the original uploaded image, but suffixed with your specified width and height.
  • Stores the resized image in the same Storage bucket as the original uploaded image.

You can even configure the extension to create resized images of different dimensions for each original image upload. For example, you might want images that are 200x200, 400x400, and 680x680 - this extension can create these three resized images then store them in your bucket.

The extension automatically copies the following metadata, if present, from the original image to the resized image(s): Cache-Control, Content-Disposition, Content-Encoding, Content-Language, Content-Type, and user-provided metadata (a new Firebase storage download token will be generated on the resized image(s) if the original metadata contains a token). Note that you can optionally configure the extension to overwrite the Cache-Control value for the resized image(s).

Detailed configuration information

To configure this extension, you specify a maximum width and a maximum height (in pixels, px). This extension keeps the aspect ratio of uploaded images constant and shrinks the image until the resized image's dimensions are at or under your specified max width and height.

For example, say that you specify a max width of 200px and a max height of 100px. You upload an image that is 480px wide by 640px high, which means a 0.75 aspect ratio. The final resized image will be 75px wide by 100px high to maintain the aspect ratio while also being at or under both of your maximum specified dimensions.

Additional setup

Before installing this extension, make sure that you've set up a Cloud Storage bucket in your Firebase project.


To install an extension, your project must be on the Blaze (pay as you go) plan

  • You will be charged a small amount (typically around $0.01/month) for the Firebase resources required by this extension (even if it is not used).
  • This extension uses other Firebase and Google Cloud Platform services, which have associated charges if you exceed the service’s free tier:
  • Cloud Storage
  • Cloud Functions (Node.js 10+ runtime. See FAQs)


Firebase コンソールの使用

拡張機能のインストールと管理は、Firebase コンソールで行えます。


Firebase CLI の使用

拡張機能のインストールと管理は、Firebase CLI でも行えます。

ステップ 1: 以下の npm コマンドを実行して、CLI をインストールするか、最新バージョンの CLI に更新します。

npm install -g firebase-tools
正常に機能しない場合は、Firebase CLI リファレンスを確認するか、npm のアクセス権を変更してください。

ステップ 2: 以下のコマンドを実行して、この拡張機能をインストールします。

firebase ext:install storage-resize-images --project=projectId_or_alias
Cloud Storage