Backblaze

Speed up Backblaze B2 file delivery with bunny.net CDN for global caching and reduced bandwidth costs.

Bunny CDN caches files from your Backblaze B2 bucket and delivers them from a global edge network, speeding up delivery and saving on bandwidth costs. This guide uses S3-compatible authentication to securely connect a private B2 bucket. If you don’t have a Backblaze B2 account yet, you can create one for free.

Prefer to keep your files on bunny.net? Bunny Storage is globally replicated object storage with tight CDN integration, and it offers an S3-compatible API (currently in beta).

1. Create a private B2 bucket

   Log in to Backblaze and click Create a Bucket. Set the bucket to Private mode to keep your content secure while it’s served to users. Encryption and Object Lock can be left at their defaults.

   

   
2. Create an S3 application key

   To authenticate securely, Bunny CDN connects to your bucket using S3 authentication. Select App Keys in the Backblaze dashboard.

   

   Click Add a New Application Key.

   

   Select the private bucket you created and ensure Allow List All Bucket Names is checked, then click Create New Key.

   

   On the confirmation page, save the keyID and applicationKey somewhere safe. You’ll need them in a later step.

   
3. Find your S3 bucket URL

   Click Browse Files and upload a test file if you don’t have one. Click the (i) info tooltip next to the file.

   

   Find the S3 URL and save it, excluding the file name. For example, for a bucket named bunnytestbucket:

   https://bunnytestbucket.s3.eu-central-003.backblazeb2.com
   

   
4. Create a Pull Zone

   Log in to your bunny.net dashboard and open Add Pull Zone. Give it a name (this becomes your CDN hostname) and paste the S3 URL from the previous step into the Origin URL field. The Host Header is generated automatically and doesn’t need changing. For details, see How to create your first Pull Zone.

   

   To use an existing Pull Zone instead, set the same Origin URL in its settings.

   
5. Secure the connection with S3 authentication

   Open the S3 Authentication section of your Pull Zone’s Security settings and click Enable AWS S3 Authentication. Fill in the details using the keys from step 2:

   • AWS Key: your B2 keyID
   • AWS Secret: your B2 applicationKey
   • AWS Region Name: the region from your origin URL (for example, eu-central)

   

   Click Save Configuration.

6. Test your Pull Zone

   With everything configured, request a file through your Pull Zone hostname, for example:

   https://bunnytestwordpress.b-cdn.net/code-to-share.js
   

   If the file is served, your private B2 bucket is protected by S3 authentication and accelerated by Bunny CDN. Replace your existing URLs with the Bunny CDN URLs in your application to start serving cached content.