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Cloudflare R2 Configuration Guide ​

Service Overview ​

Cloudflare R2 is Cloudflare's object storage service, compatible with the S3 API. R2's biggest feature is zero egress fees - reading data from R2 requires no traffic fees.

Official Website: https://www.cloudflare.com/products/r2/

Official Documentation: https://developers.cloudflare.com/r2/

Pricing (as of 2024):

  • Storage: $0.015/GB/month
  • Class A operations (write): $4.50/million requests
  • Class B operations (read): $0.36/million requests
  • ✅ Egress traffic: Completely free

Configuration Parameters ​

Endpoint ​

R2 endpoint format:

https://<account-id>.r2.cloudflarestorage.com

Finding Account ID:

  1. Log into Cloudflare Dashboard
  2. View right sidebar, Account ID is displayed below account name
  3. Or get from R2 page URL: https://dash.cloudflare.com/<account-id>/r2

Example endpoint:

https://abc123def456789.r2.cloudflarestorage.com

Region ​

Recommended to use auto, R2 will automatically select the best location.

Optional region values:

  • auto - Automatic selection (recommended)
  • wnam - Western North America
  • enam - Eastern North America
  • weur - Western Europe
  • eeur - Eastern Europe
  • apac - Asia Pacific

Obtaining Access Keys ​

Create R2 API Token ​

  1. Enter R2 Management Page

    • Log into Cloudflare Dashboard
    • Click "R2" in left menu
    • If first time, need to purchase R2 subscription (can choose free plan)

  2. Manage API Tokens

    • Click "Manage R2 API Tokens" in top right
    • Or go directly to: Settings → R2 → API Tokens

  3. Create Token

    • Click "Create API Token" button
    • Enter token name (e.g., s3-file-viewer-token)

  4. Configure Permissions

    Permission Types:

    • Admin Read & Write: Full access to all buckets (not recommended)
    • Object Read & Write: Read/write objects (recommended)
    • Object Read only: Read-only access

  5. Save Keys

    • Access Key ID: 32 characters, e.g., a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6
    • Secret Access Key: 64 characters
    • ⚠️ Important: Secret Key is only shown once, must save immediately

Configuration Examples ​

Basic Configuration ​

Connection Name: Cloudflare R2
Endpoint: https://abc123def456789.r2.cloudflarestorage.com
Access Key: a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6
Secret Key: 0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef
Region: auto

Specified Region Configuration ​

Connection Name: R2 Asia Pacific
Endpoint: https://abc123def456789.r2.cloudflarestorage.com
Access Key: a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6
Secret Key: 0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef
Region: apac