Upload once, deliver everywhere
Presigned URLs for direct uploads. Automatic CDN distribution. Image optimization and video streaming built in.
import { Stack0 } from '@stack0/sdk'const stack0 = new Stack0({ apiKey: process.env.STACK0_API_KEY })// Get presigned URL for direct uploadexport async function getUploadUrl(filename: string, contentType: string) {const { uploadUrl, fileId, cdnUrl } = await stack0.cdn.createUploadUrl({filename,contentType,expiresIn: 3600, // 1 hour})return { uploadUrl, fileId, cdnUrl }}// Upload from serverexport async function uploadFile(file: Buffer, filename: string) {const { cdnUrl } = await stack0.cdn.upload({file,filename,folder: 'uploads',visibility: 'public',})return cdnUrl}// Upload from URLexport async function uploadFromUrl(sourceUrl: string) {const { cdnUrl } = await stack0.cdn.uploadFromUrl({url: sourceUrl,folder: 'imports',})return cdnUrl}
What's included
Presigned URLs
Generate temporary upload URLs. Upload directly from browser without server processing.
CDN Delivery
Files automatically distributed to edge locations. Fast loading worldwide.
Image Transforms
Resize, crop, and optimize images on the fly via URL parameters.
Video Streaming
Automatic HLS transcoding for video. Adaptive bitrate for smooth playback.
URL Import
Import files from existing URLs. Migrate content without downloading first.
Fast Uploads
Optimized upload endpoints. Handle large files efficiently.
Built for production
Presigned uploads
Upload directly from browser to CDN. No file passing through your server.
Global CDN
Files served from edge locations worldwide. Fast loading everywhere.
Image optimization
Automatic WebP conversion, resize, and quality optimization on delivery.
Video streaming
HLS adaptive streaming for video files. Works on any device.
Private files
Signed URLs for access control. Keep sensitive files secure.
Simple pricing
$0.25/GB storage, $0.25/GB bandwidth. No requests charges or hidden fees.
Common implementations
User Avatars
Let users upload profile pictures. Automatic resize and optimization.
Product Images
E-commerce product galleries with automatic thumbnails and zoom versions.
Document Storage
PDFs, spreadsheets, and documents with optional signed URLs for privacy.
Video Content
User-generated video with automatic transcoding and streaming.
Frequently asked questions
Stack0 CDN accepts any file type. Common uses include images (JPEG, PNG, WebP, GIF), videos (MP4, MOV, WebM), documents (PDF, DOCX), and application assets. There are no restrictions on file extensions.
Presigned URLs allow browser uploads directly to CDN without passing through your server. Request a URL from our API, then use it client-side to upload files. The URL expires after the configured time for security.
The default maximum file size is 100MB per file. For larger files up to 5GB, use multipart uploads. Enterprise plans support even larger files with custom limits.
Yes. Set visibility to 'private' when uploading, then generate signed URLs with expiration times to grant temporary access. Private files are not publicly accessible without a valid signed URL.
Storage is billed at $0.25 per GB stored per month. Bandwidth is billed separately at $0.25 per GB transferred. There are no per-request fees for uploads or downloads.