Detect text in files (PDF/TIFF)

The Vision API can detect and transcribe text from PDF and TIFF files stored in Cloud Storage.

Document text detection from PDF and TIFF must be requested using the files:asyncBatchAnnotate function, which performs an offline (asynchronous) request and provides its status using the operations resources.

Output from a PDF/TIFF request is written to a JSON file created in the specified Cloud Storage bucket.

Limitations

The Vision API accepts PDF/TIFF files up to 2000 pages. Larger files will return an error.

Authentication

API keys are not supported for files:asyncBatchAnnotate requests. See Using a service account for instructions on authenticating with a service account.

The account used for authentication must have access to the Cloud Storage bucket that you specify for the output (roles/editor or roles/storage.objectCreator or above).

You can use an API key to query the status of the operation; see Using an API key for instructions.

Document text detection requests

Currently PDF/TIFF document detection is only available for files stored in Cloud Storage buckets. Response JSON files are similarly saved to a Cloud Storage bucket.