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Content Understanding service quotas and limits

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This article offers a quick reference of the quotas and limits for the Azure AI Content Understanding service.

Resource limits

Quota Standard (S0)
Max analyzers 100k
Max analysis/min 1000 pages/images
Four hours of audio
Four hours of video
Max operations/min 3000

Input file limits

Document and text

Supported File Types File Size Length
✓ .pdf
✓ .tiff
✓ .jpg
✓ .png
✓ .bmp
✓ .heif		 ≤ 200 MB ≤ 300 pages
✓ .txt ≤ 1 MB ≤ 1M characters

Image

Supported File Types File Size Resolution
✓ .jpg
✓ .png
✓ .bmp
✓ .heif		 ≤ 200 MB Min: 50 x 50 pixels
Max: 10k x 10k pixels

Audio

Supported File Types File Size Length
✓ .wav (PCM, A-law, μ-law)
✓ .mp3
✓ .opus, .ogg (Opus)
✓ .flac
✓ .wma
✓ .aac
✓ .amr (AMR-NB, AMR-WB)
✓ .webm (Opus, Vorbis)
✓ .m4a (AAC, ALAC)
✓ .spx		 ≤ 200 MB ≤ 2 hours

Video

Supported File Types File Size Resolution Length
✓ .mp4, .m4v
✓ .flv (H.264 and AAC)
✓ .wmv, .asf
✓ .avi
✓ .mkv
✓ .mov		 ≤20 GB † Min: 320 x 240 pixels
Max: 1920 x 1,080 pixels		 ≤4 hours †

Note

The file size limit is 200 MB and the duration limit is 30 minutes if the video file is included directly in the analysis request.

Field schema limits

Content Understanding supports both basic field value types and nested structures, including lists, groups, tables, and fixed tables.

  • Basic field value types: string, date, time, number, integer, and boolean.
  • List field: A sequence of values of the same type, represented as an array of basic fields in the API.
  • Group field: A set of semantically related fields, represented as an object of basic fields in the API.
  • Table field: A variable number of items with fixed subfields, represented as an array of objects of basic fields in the API.
  • Fixed table field: A group of fields with shared subfields, represented as an object of objects of basic fields in the API.

The following limits apply as of version 2024-12-01-preview.

Basic limits

Property Document Image Text Audio Video
Max fields 50 10 10 10 10
Max classify field categories 300 300 300 300 300
Supported generation methods extract generate
classify		 generate
classify		 generate
classify		 generate
classify
  • The Max fields limit includes all named fields. For example, a list of strings counts as one field, while a group with string and number subfields counts as three fields. To extract beyond default limits, contact us at cu_contact@microsoft.com.
  • The Max classify field categories limit is the total number of categories across all fields using the classify generation method.
  • The generation method currently applies only to basic fields.

Field type limits

Field type Document Image Text Audio Video
Basic No boolean No date, time string string No date, time
List N/A No date, time string string No date, time
Group N/A No date, time N/A N/A No date, time
Table No boolean No date, time string string No date, time
Fixed table No boolean N/A N/A N/A N/A

Classification fields

Classification fields can be defined to return either a single category (single-label classification) or multiple categories (multi-label classification).

  • Single-label classification: Defined using a string field with the classify method. It can be a top-level basic field or a subfield within a group or table.
  • Multi-label classification: Represented as a list of string fields with the classify method. In the REST API, method=classify and enum are specified on the inner string field and can only be a top-level field.

Note: Document analyzers currently don't support classification fields.

Training limits

File type Max training data
Document 1 GB total
50k pages/images