File Storage and CDN Providers: Vercel Blob, Cloudflare R2, AWS S3, Backblaze B2, Bunny CDN, Cloudinary, Uploadcare

⬅️ Cloud & Hosting Overview

If you're building a SaaS in 2026 and trying to pick where user uploads, marketing assets, and AI-generated files live, this is the consolidated comparison. Get the egress fee math wrong and your "cheap" object storage costs $400/month. Pick wrong on the upload pipeline and your customers wait 6 seconds for a thumbnail to render.

TL;DR Decision Matrix

The first decision is what kind of files. User uploads (avatars, documents, files), marketing assets (images, video), AI-generated content (images, video, audio), or static site assets. Each shape has a best-in-class tool; one-size-fits-all answers usually overspend.

Categorize the Files First

User uploads (avatars, documents, files)

Customer signs up, uploads a profile photo or attaches a file to a record. Typical volumes: small files, low to moderate volume per customer.

Right tools:

• Vercel Blob — easiest if on Vercel, public + private, no extra vendor relationship
• Cloudflare R2 — cheap, S3-compatible, zero egress
• Uploadcare — best DX for upload widget if you want a hosted picker
• AWS S3 — if you're on AWS and need maturity

For most indie SaaS in 2026 on Vercel: Vercel Blob. For Cloudflare-stack apps: R2.

Marketing assets (homepage images, hero images, og-images)

Site assets you serve to lots of visitors. High-egress, image-optimization-friendly.

Right tools:

• Vercel Blob + Next.js <Image> (auto-optimization included on Vercel)
• Cloudflare Images — bundled transforms + global CDN
• Cloudinary — most polished, expensive at scale
• Bunny CDN + Bunny Optimizer — cheap and fast

AI-generated content (images, video, audio)

The product generates output via Replicate / OpenAI / Anthropic / fal / Hugging Face / etc. and stores it. Output volumes can scale fast; some has long-term value, some is ephemeral.

Right tools:

• Cloudflare R2 — cheapest at scale, zero egress
• Vercel Blob — easiest if on Vercel
• Backblaze B2 + Cloudflare CDN — cheapest combo
• Mux for AI-generated video specifically

Video uploads + delivery

Customer uploads video; you store, transcode, deliver.

Right tools:

• Mux — purpose-built for video, includes transcode + adaptive streaming
• Cloudflare Stream — Cloudflare-native, simpler pricing
• Bunny Stream — cheap, decent quality
• Vimeo OTT / api.video — alternatives

Static site assets (CSS, JS, fonts)

Your framework (Next.js, Astro, etc.) handles this; the deployment platform's CDN serves it. Don't overthink.

Right tools:

• Whatever your framework / deployment platform provides (Vercel, Netlify, Cloudflare Pages, etc.)
• Skip dedicated CDN unless you have very specific needs

Provider Deep-Dives

Vercel Blob — Vercel-Native Object Storage

Vercel Blob is Vercel's object storage. Public AND private storage as of 2025+ updates. S3-compatible API. Bundled with Vercel deployments.

Strengths:

• Zero auth setup if you're on Vercel
• Public + private storage in one product
• Integrates with Next.js <Image> for auto-optimization on public assets
• Predictable pricing tied to Vercel platform usage
• Works seamlessly with Vercel Functions and Vercel Workflow

Weaknesses:

• Vercel-stack lock-in
• Egress charged per Vercel pricing tier
• Less expressive than R2/S3 for advanced use cases (lifecycle policies, multi-region)

Pick Vercel Blob when: Vercel-native, want one less vendor relationship, simple file storage needs.

Cloudflare R2 — Zero-Egress Object Storage

R2 is Cloudflare's S3-compatible object storage. The killer feature: zero egress fees. You're charged only for storage and operations.

Strengths:

• Zero egress fees (vs S3's $0.09/GB which dominates costs)
• S3-compatible API (existing tools work unchanged)
• Cheap storage ($0.015/GB)
• Pairs well with Cloudflare Workers
• Generous free tier (10 GB storage, 1M requests/mo)

Weaknesses:

• Cloudflare-only platform; multi-region routing different from S3
• Newer than S3; ecosystem still building
• Some advanced S3 features (Glacier-equivalent, Object Lock) are missing or different

Pick R2 when: high-egress workload (video, AI media, downloads), cost-sensitive, S3-compatible APIs important.

AWS S3 — The Mature Default

S3 has been the object-storage incumbent for ~20 years. Mature, deep ecosystem, infinite features.

Strengths:

• Most complete feature set (lifecycle, versioning, replication, Glacier tiers, Object Lock, etc.)
• Vast ecosystem of integrations
• Mature SDKs in every language
• Reliable at any scale
• Strong IAM / security primitives

Weaknesses:

• Egress is expensive ($0.09/GB out — this is what kills many indie projects)
• Pricing complexity (request charges, storage class transitions, lifecycle ops)
• Brings AWS operational complexity

Pick S3 when: AWS-deep team, enterprise contracts, need specific S3 features (Glacier, Object Lock, etc.).

Backblaze B2 — Cheapest Storage

Backblaze B2 is the cheapest object storage in the market. Pairs natively with Cloudflare via the "Bandwidth Alliance" — egress to Cloudflare is free.

Strengths:

• Cheapest storage ($0.006/GB; less than half of R2 / S3)
• Free egress to Cloudflare (so use Cloudflare as CDN in front; net cost is dominated by storage)
• S3-compatible API
• Generous free tier (10 GB storage, 1 GB/day egress)

Weaknesses:

• Smaller community / ecosystem than R2 / S3
• Direct egress to non-Cloudflare destinations is $0.01/GB
• Less feature-rich than S3

Pick B2 when: cost-conscious, willing to pair with Cloudflare CDN, basic storage needs.

Cloudflare Images — Image-Specific

Cloudflare Images is purpose-built for image storage + delivery. Bundles upload + transforms + CDN delivery.

Strengths:

• Single product covers upload to delivery
• On-the-fly transforms (resize, crop, format conversion to WebP/AVIF)
• Cheap pricing ($5 / 100K images stored, plus delivery tiers)
• Global CDN included

Weaknesses:

• Images only (not generic objects, not video)
• Transform options less rich than Cloudinary
• Cloudflare-stack lock-in

Pick Cloudflare Images when: image-heavy product, want bundled storage + transforms + CDN, cheap.

Cloudinary — Premium Image / Video Pipeline

Cloudinary is the most polished image + video pipeline. Transforms, optimization, AI tagging, watermarks, etc.

Strengths:

• Most feature-rich transforms
• AI features (background removal, auto-tagging, smart cropping)
• Mature, broad ecosystem
• Strong DX with SDKs everywhere
• Programmable transformations via URL

Weaknesses:

• Expensive ($99+/mo for the lowest "real" plan; usage-based above)
• Pricing scales fast at high volume
• Locks media metadata into their format

Pick Cloudinary when: marketing-heavy media workflows, need best-in-class transforms, willing to pay.

Uploadcare — Upload Widget + Pipeline

Uploadcare ships an excellent upload widget plus storage + delivery + transforms. Strong DX for the upload UX specifically.

Strengths:

• Best-in-class upload widget (drag-drop, multi-file, progress, validation)
• Image transforms + adaptive delivery
• Generous free tier (3 GB/mo)
• Good for user-uploaded media specifically

Weaknesses:

• Smaller ecosystem than R2/S3/Vercel Blob
• Pricing scales with traffic
• Less suitable for high-volume programmatic storage

Pick Uploadcare when: user-uploaded media is core flow, value the polished upload UX, willing to pay for it.

Bunny CDN + Bunny Storage — Cheap, Fast

Bunny CDN is the indie-friendly CDN. Cheap, fast, simple pricing. Bunny Storage is the paired object storage.

Strengths:

• Cheap CDN delivery ($0.01-$0.04/GB depending on region)
• Bunny Optimizer adds image transforms ($0.005/optimization)
• Bunny Stream adds video delivery
• Simple, transparent pricing
• Strong indie reputation

Weaknesses:

• Smaller than Cloudflare; PoPs vary by region
• Less feature-rich than Cloudfront / Cloudflare
• DX OK but not best-in-class

Pick Bunny when: cost-sensitive, indie scale, willing to manage a slightly less polished tooling.

Mux — Video Specific

Mux is purpose-built for video. Upload, transcode, adaptive streaming, analytics, video-on-demand and live.

Strengths:

• Best-in-class video pipeline
• Adaptive bitrate streaming out of the box
• Mux Data for video analytics
• Strong DX (SDKs in every language)

Weaknesses:

• Pricing scales with delivery (per-minute viewing)
• Overkill for simple video needs
• Vendor lock-in for the video pipeline

Pick Mux when: video is core to the product, need adaptive streaming + analytics.

ImgIX

ImgIX puts an image-transform CDN in front of your existing object storage (S3 / R2 / etc.). On-the-fly resize, crop, format conversion via URL parameters.

Pick when: existing object storage works fine, you just need transforms in front.

GCS / Azure Blob

Google Cloud Storage and Azure Blob are GCP / Azure's S3 equivalents. Pick if your team is already on those clouds.

What None of Them Solve

• Image optimization strategy. All providers offer transforms; you decide which transforms to apply and where. Default to AVIF where browser-supported, WebP elsewhere; cap dimensions; serve responsive sizes.
• Cache invalidation. Cache-control headers, edge caching, purge strategies. Misconfigured caches mean stale content; aggressive caches mean cache thrash. Read the docs.
• Bandwidth budgeting. Free tiers run out; egress can spike unexpectedly. Set monitoring alerts on egress per day.
• Upload validation. Client-side validation (file size, type, dimensions) is your job; the storage provider doesn't enforce business rules.
• Virus / malware scanning. Especially for user uploads. Integrate ClamAV, VirusTotal, or a dedicated service before files become public.
• Compliance and data residency. GDPR, HIPAA, FedRAMP — varies by provider and region. Check before committing.
• CDN cache hit rates. Tools report it; you tune it. A 60% cache-hit rate vs 95% has 5x cost difference at scale.

Pragmatic Stack Patterns

Vercel-native indie SaaS, simple file uploads:

• Vercel Blob (public + private)
• Next.js <Image> for auto-optimization
• Total: bundled with Vercel pricing

Indie SaaS with high egress (downloads, AI media):

• Cloudflare R2 ($0.015/GB storage, free egress)
• Or Backblaze B2 + Cloudflare CDN (cheapest combo)
• Total: $5-50/mo at indie scale

Image-heavy marketing site / B2C product:

• Cloudflare Images (bundled storage + transforms + CDN)
• Or Cloudinary if you need AI features and budget allows
• Total: $5-99/mo

User-uploaded media as core flow:

• Uploadcare for upload widget UX
• Or Vercel Blob + custom upload UI

Video-heavy product:

• Mux (purpose-built)
• Or Cloudflare Stream (cheaper, simpler)
• Or Bunny Stream (cheapest, less polished)

AWS-deep enterprise team:

• S3 + CloudFront
• Pay the egress costs; benefit from ecosystem

Cost-obsessed indie:

• Backblaze B2 + Cloudflare CDN (free egress via Bandwidth Alliance)
• Manual transform pipeline (sharp / ImageMagick + your own worker)
• Total: <$10/mo at small scale

Decision Framework: Three Questions

1. What kind of files are you primarily storing? → User uploads: Vercel Blob or R2. Image-heavy: Cloudflare Images or Cloudinary. Video: Mux. AI-generated: R2.
2. What's your egress profile? → Low egress: any provider works. High egress (video, downloads, AI media): R2 or Backblaze + Cloudflare.
3. What stack are you on? → Vercel: Vercel Blob default. Cloudflare: R2 + Cloudflare Images. AWS: S3. Anywhere: R2 or Backblaze.

Three questions, three picks. The 90% answer for indie SaaS in 2026 is Vercel Blob (if on Vercel) or R2 (if not). Spending more than a day deciding is a sign you're avoiding the harder work of designing the upload UX.

Verdict

For most readers building a SaaS in 2026:

• Vercel-native, simple needs: Vercel Blob. Default.
• High-egress workloads (video, AI media): Cloudflare R2.
• Cost-obsessed indie: Backblaze B2 + Cloudflare CDN.
• Image-heavy with transforms: Cloudflare Images or Cloudinary.
• User-upload UX critical: Uploadcare.
• Video core to product: Mux.
• AWS-deep enterprise: S3.

The hidden cost in file storage is egress, not storage. Storage prices are within 50% across providers; egress prices range from free (R2) to $0.09/GB (S3) — a 10x+ swing. For products with high-egress profiles (video, AI media, downloads), the egress decision dominates the storage decision.

See Also

• Vercel Blob — deep-dive on the Vercel-native default
• Vercel Functions — runtime that handles uploads
• Vercel Sandbox — for processing uploads in isolated execution
• Cloudflare — for R2 + Cloudflare Images / Stream / CDN
• AWS — for S3 deep-dive
• Database Providers — companion for application data (file metadata)
• Image Generation — AI-generated images need a place to live (R2 or Vercel Blob default)
• Vector Database Providers — companion for AI workloads
• Background Jobs Providers — file-processing jobs run here

⬅️ Cloud & Hosting Overview