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This document contains current API restrictions and usage quotas on use of
Storage Transfer Service. This page is updated when there are changes to these
restrictions and usage quotas.
Concurrent transferOperations limit
The following table describes the limit for concurrent in-progress
transferOperations:
Maximum in-progress `transferOperations`
Applies to
200
project
Rate quotas
Storage Transfer Service enforces rate quotas on all requests made. These quotas
apply on a per-project basis; requests made through Google Cloud CLI,
Google Cloud console, and Cloud Client Libraries also count towards these rate quotas.
This table provides the metric, API methods, and default limits for each quota:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22 UTC."],[],[],null,["# Quotas & Limits\n\nThis document contains current API restrictions and usage quotas on use of\nStorage Transfer Service. This page is updated when there are changes to these\nrestrictions and usage quotas.\n| **Note:** Storage Transfer Service supports URL lists with a maximum size of 128 MB. See [Creating a URL List](/storage-transfer/docs/create-url-list).\n\nConcurrent transferOperations limit\n-----------------------------------\n\nThe following table describes the limit for concurrent in-progress\n[`transferOperations`](/storage-transfer/docs/reference/rest/v1/transferOperations):\n\n| **Note:** When the number of in-progress `transferOperations` in a project reaches the limit, new and resumed `transferOperations` beyond the limit are placed in `QUEUED` [status](/storage-transfer/docs/reference/rest/v1/transferOperations#status). As in-progress `transferOperations` complete, any `QUEUED` `transferOperations` are moved to `IN_PROGRESS` status.\n\nRate quotas\n-----------\n\nStorage Transfer Service enforces rate quotas on all requests made. These quotas\napply on a per-project basis; requests made through Google Cloud CLI,\nGoogle Cloud console, and Cloud Client Libraries also count towards these rate quotas.\n\nThis table provides the metric, API methods, and default limits for each quota:\n\nAdjusting quotas\n----------------\n\nFor information on adjusting quotas, see [Manage quota values](/docs/quotas/overview#manage_quota_values)."]]
