Ethereum Blob Limit Bumps Up To 21, Boosting Network Scalability (2026)

Ethereum developers have raised the blob limit for a second time in recent weeks, a move that will allow more transactions to be batched via rollups, making them cheaper.

Ethereum scalability was boosted on Wednesday with the second Blob Parameter-Only hard fork, raising the blob limit from 15 to 21, the first of many improvements aimed at scaling the Ethereum ecosystem in 2026.

The second BPO hard fork, which took effect on Wednesday at 1:01:11 UTC, further increases Ethereum’s data throughput by allowing more transactions to be batched via rollups.

The BPO hard fork also raised the blob target from 10 to 14, which is widely seen as the more important metric to watch, as consistently approaching the 21-blob limit could overload node bandwidth and storage.

One blob unit fits 128 kilobytes of data, meaning Ethereum can now store up to 2,688 KB in a single block.

While blobs boost transaction throughput on Ethereum layer 2s, they also help stabilize gas fees on the Ethereum mainnet as the network becomes less congested.

YCharts data shows that Ethereum transaction fees have been far more stable since the first BPO hard fork on Dec. 9, 2025.

Participants in the Ethereum All Core Developers meeting on Dec. 15 also discussed the idea of raising the network gas limit from 60 million to 80 million once the second BPO hard fork was implemented.

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Doing that would directly increase the number of transactions and smart contract operations that can fit in each Ethereum block — further boosting overall throughput while potentially lowering fees.

Source: CoinTelegraph