Upload images and videos to S3 directly from ComfyUI workflows. Load checkpoints by filename. No environment variables needed - all credentials go directly in the nodes.

Installation

Install via ComfyUI-Manager or clone to ComfyUI/custom_nodes
Restart ComfyUI
Look for nodes in "S3 Serverless Storage" category

Nodes

S3 Image Upload - Upload images as WebP files

Put your S3 credentials directly in the node
Images automatically convert to WebP format
Clean filenames: test123 becomes test123.webp

S3 Video Upload - Upload video files

Same inline credentials approach
Keeps original video format
Clean filenames: myvideo with clip.mp4 becomes myvideo.mp4

S3 Image Load - Download images from S3 URLs

Works with public URLs and signed URLs
No credentials needed for public files

String Checkpoint Loader - Load checkpoints by filename

Load any safetensors/checkpoint file from the checkpoints directory
Provide filename as string input instead of dropdown selection
Example: model.safetensors or checkpoint.ckpt

Usage

For AWS S3:

bucket_name: your bucket name
access_key_id: your access key
secret_access_key: your secret key
region: your AWS region
endpoint_url: leave empty

For Supabase:

bucket_name: your bucket name
access_key_id: your supabase S3 key
secret_access_key: your supabase S3 secret
region: us-east-1
endpoint_url: https://yourproject.supabase.co/storage/v1/s3

For other S3-compatible services:

Fill in your service's S3 endpoint URL.

For String Checkpoint Loader:

ckpt_filename: Just the filename (e.g., model.safetensors)
File must exist in your ComfyUI checkpoints directory

Security Note

Don't share workflows with your credentials filled in. Clear the credential fields before sharing workflow files with others.