| author | normesta |
|---|---|
| ms.service | azure-storage |
| ms.topic | include |
| ms.date | 04/17/2026 |
| 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 | 4000 MiB |
| Maximum size of a block blob | 50,000 X 4000 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 TiB2 |
| 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 second2 |
| Target throughput for a single block blob | Up to storage account ingress/egress limits1 |
1 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, upload larger blobs or blocks. Specifically, call the Put Blob or Put Block operation with a blob or block size that's greater than 256 KiB.
2 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 | 4000 MiB | Approximately 190.7 TiB (4000 MiB X 50,000 blocks) | 5000 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 |