Limits and quotas

There are two tiers of keys for the Custom Vision service. You can sign up for a F0 (free) or S0 (standard) subscription through the Azure portal. This page outlines the limitations of each tier. See the Azure AI services pricing page for more details on pricing and transactions.

Factor F0 (free) S0 (standard)
Projects 2 100
Training images per project 5,000 100,000
Predictions / month 10,000 Unlimited
Tags / project 50 500
Iterations 20 20
Min labeled images per Tag, Classification (50+ recommended) 5 5
Min labeled images per Tag, Object Detection (50+ recommended) 15 15
How long prediction images stored 30 days 30 days
Prediction operations with storage (Transactions Per Second) 2 10
Prediction operations without storage (Transactions Per Second) 2 20
TrainProject (API calls Per Second) 2 10
Other API calls (Transactions Per Second) 10 10
Accepted image types jpg, png, bmp, gif jpg, png, bmp, gif
Min image height/width in pixels 256 (see note) 256 (see note)
Max image height/width in pixels 10,240 10,240
Max image size (training image upload) 6 MB 6 MB
Max image size (prediction) 4 MB 4 MB
Max number of regions per image (object detection) 300 300
Max number of tags per image (classification) 100 100


Images smaller than 256 pixels will be accepted but upscaled.


The image aspect ratio should not be larger than 25:1.