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Cloudflare R2 vs AWS S3: zero egress object storage

Compare R2 and S3 on egress pricing, consistency, API compatibility, and when each wins.

Cloud ComparisonBeginner

Why

S3 egress at $0.09/GB dominates the bill for any public-asset workload. R2's zero egress can cut storage bills 80%+ for media-heavy sites, but R2 lacks S3's mature ecosystem and strong consistency on all operations.

When

Use R2 when serving public assets (images, videos, downloads) at scale; use S3 for backups, data lakes, or when you need Cross-Region Replication and Glacier archival. Avoid multi-cloud for small teams — networking, IAM, and billing differences add 40% ops overhead.

Pick one provider and use it well; add a second only for specific workloads (e.g. GCP for ML).

How

1. Migrate with rclone using S3-compatible API: `rclone copy s3:bucket r2:bucket`. 2. R2 supports the S3 API so aws-sdk works with a custom endpoint. 3. Set up a custom domain on R2 for zero-egress public serving. 4. For mixed workloads, use S3 for writes and R2 as a CDN-origin for reads (mirror via rclone cron). 5. Compare: 1TB stored + 10TB egress/month → S3 \$23 + \$921 = \$944; R2 \$15 + \$0 = \$15.

Example

// aws-sdk v3 works with R2 by swapping endpoint import { S3Client } from '@aws-sdk/client-s3'; const r2 = new S3Client({ region: 'auto', endpoint: 'https://<accountid>.r2.cloudflarestorage.com', credentials: { accessKeyId: R2_KEY, secretAccessKey: R2_SECRET }, });

Common Problems

  • ⚠R2 list operations are eventually consistent — a just-uploaded object may not appear in ListObjectsV2 for a few seconds.
  • ⚠S3 Transfer Acceleration has no R2 equivalent; large uploads from far regions are slower on R2.
  • ⚠R2 free tier (10GB storage, 1M Class A ops) is generous but Class B ops (10M/mo) can be exceeded by list-heavy workloads.

Best Practices

  • ✓Use R2 as the origin for Cloudflare CDN — zero egress + global edge caching for free.
  • ✓Keep S3 for write-heavy workloads needing strong consistency and multipart >5GB with Transfer Acceleration.
  • ✓Mirror S3→R2 nightly with rclone; serve reads from R2 to zero out egress.

FAQ

What is Cloudflare R2 vs AWS S3: zero egress object storage and what problem does it solve?

Compare R2 and S3 on egress pricing, consistency, API compatibility, and when each wins. It lets developers deploy, store, and scale without self-managing infrastructure — a core reference for cloud service selection.

How do I get started with Cloudflare R2 vs AWS S3: zero egress object storage in 5 minutes?

Two steps to run it: (1) Migrate with rclone using S3-compatible API: `rclone copy s3:bucket r2:bucket`.; (2) R2 supports the S3 API so aws-sdk works with a custom endpoint.. Validate on the free tier first, then wire into production.

What is the #1 pitfall with Cloudflare R2 vs AWS S3: zero egress object storage?

The most frequent issue is: R2 list operations are eventually consistent — a just-uploaded object may not appear in ListObjectsV2 for a few seconds.. Run a pre-launch checklist item by item, and add policy/config scanning in CI.

What are the best practices for Cloudflare R2 vs AWS S3: zero egress object storage?

Best practices for Cloudflare R2 vs AWS S3: zero egress object storage include: Use R2 as the origin for Cloudflare CDN — zero egress + global edge caching for free.; Keep S3 for write-heavy workloads needing strong consistency and multipart >5GB with Transfer Acceleration.; Mirror S3→R2 nightly with rclone; serve reads from R2 to zero out egress.. The first one — "Use R2 as the origin for Cloudflare CDN — zero egress + global edge caching for free." — should be a team default baked into your IaC templates.

How do I control cost and avoid bill surprises with Cloudflare R2 vs AWS S3: zero egress object storage?

Three ways to prevent overspend: (1) tag every resource with env/team and enable billing alarms; (2) set budget thresholds to trigger Slack/email alerts; (3) review idle resources in Cost Explorer regularly and clean them up. Most Cloudflare R2 vs AWS S3: zero egress object storage options offer a free tier — validate within free quota before scaling.