---
author: normesta
ms.service: azure-storage
ms.topic: include
ms.date: 05/18/2026
ms.author: normesta
---

| Resource | Target |
|-|-|
| Maximum size of single blob container | Same as maximum storage account capacity |
| Maximum number of blocks in a block blob or append blob | 50,000 blocks |
| Maximum size of a block in a block blob | 4,000 MiB |
| Maximum size of a block blob | 50,000 x 4,000 MiB (approximately 190.7 TiB) |
| Maximum size of a block in an append blob | 4 MiB |
| Maximum size of an append blob | 50,000 x 4 MiB (approximately 195 GiB) |
| Maximum size of a page blob | 8 TiB<sup>2</sup> |
| Maximum number of stored access policies per blob container | 5 |
| Target request rate for a single block blob | Up to 3,000 requests per second |
| Target request rate for a single page blob | Up to 500 requests per second |
| Target throughput for a single page blob | Up to 60 MiB per second<sup>2</sup> |
| Target throughput for a single block blob | Up to storage account ingress/egress limits<sup>1</sup> |

<sup>1</sup> Throughput for a single blob depends on several factors. These factors include but aren't limited to concurrency, request size, performance tier, speed of source for uploads, and destination for downloads. To take advantage of the performance enhancements of [high-throughput block blobs](https://azure.microsoft.com/blog/high-throughput-with-azure-blob-storage/), upload larger blobs or blocks. Specifically, call the [Put Blob](/rest/api/storageservices/put-blob) or [Put Block](/rest/api/storageservices/put-block) operation with a blob or block size that's greater than 256 KiB.

<sup>2</sup> Page blobs aren't yet supported in accounts that have a hierarchical namespace enabled.

The following table describes the maximum block and blob sizes permitted by service version.

| Service version | Maximum block size (via Put Block) | Maximum blob size (via Put Block List) | Maximum blob size via single write operation (via Put Blob) |
|-|-|-|-|
| Version 2019-12-12 and later | 4,000 MiB | Approximately 190.7 TiB (4,000 MiB x 50,000 blocks) | 5,000 MiB |
| Version 2016-05-31 through version 2019-07-07 | 100 MiB | Approximately 4.75 TiB (100 MiB x 50,000 blocks) | 256 MiB |
| Versions prior to 2016-05-31 | 4 MiB | Approximately 195 GiB (4 MiB x 50,000 blocks) | 64 MiB |