Uploadcare API
Uploadcare provides a file upload and CDN platform with REST APIs for programmatic file ingestion, storage management, and on-the-fly image/video transformations via URL-based processing directives.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Public/secret key separation is a good pattern for client-side vs server-side operations. HMAC signature option adds replay attack protection. No fine-grained scopes — secret key grants full account access.
⚡ Reliability
Best When
Best when you need a developer-friendly file upload and CDN solution with built-in image transformation without managing your own storage or CDN infrastructure.
Avoid When
Avoid when you require complex video processing, custom transcoding presets, or need to keep files entirely within your own cloud account or region.
Use Cases
- • Upload user-generated files programmatically from a backend service and store them with automatic CDN distribution
- • Apply on-the-fly image resizing, cropping, and format conversion via URL transformation parameters without preprocessing
- • Batch migrate an existing file library to Uploadcare storage using the Upload API and preserve original URLs via redirects
- • List, tag, and delete files in Uploadcare storage as part of a content lifecycle management or cleanup workflow
- • Generate secure signed URLs for private file access with expiring tokens to protect sensitive documents
Not For
- • Large-scale video transcoding pipelines requiring custom codec configurations — use Transloadit or AWS MediaConvert
- • Storing structured data or database records — Uploadcare is for binary file assets only
- • Self-hosted or on-premises file storage requirements where data must never leave your own infrastructure
Interface
Authentication
Uses a public key and secret key pair. Public key is used for upload operations (can be exposed client-side). Secret key is used for REST API management operations (server-side only). Simple key-based authentication with HMAC signature option for enhanced security on management API calls.
Pricing
Free tier is genuinely usable for small projects. Paid tiers scale with storage and bandwidth. No credit card required for free tier signup.
Agent Metadata
Known Gotchas
- ⚠ Uploaded files are not stored permanently by default — must call the store endpoint or set store=1 during upload or files expire in 24 hours
- ⚠ CDN URL transformation directives use a specific chaining syntax that differs from query parameters — order of operations matters
- ⚠ REST API and Upload API use different base URLs and authentication flows — mixing them up is a common integration error
- ⚠ File UUIDs are immutable but CDN URLs with transformations are generated on-the-fly — cache invalidation applies to transformed variants separately
- ⚠ Webhook delivery is not guaranteed exactly-once — agents processing upload webhooks should be idempotent and check file status before acting
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.