UTXO consolidation planner

A Bitcoin wallet’s balance is a set of separate coins (UTXOs), one for each payment it received. Every coin a payment spends adds to its size: about 68 vB for a Native SegWit coin, 148 vB for a legacy one. Consolidating means sending many small coins to one address of your own while fees are low, so later payments need one input instead of dozens.

Yes. A transaction that spends coins from several addresses tells anyone watching the chain that one wallet controls them all, and that link is permanent. If some coins came from sources you want to keep apart, merge them in separate transactions, or leave them as they are.

From mempool.space’s record of the fee rates in mined blocks over the last 30 days. We take the median rate of each half-hour of blocks: the target is the 20th percentile, a rate that was enough a fifth of the time, and the busy-day rate is the 90th. mempool.space reports whole sat/vB, so the target is at least 1 sat/vB. You can change any rate by hand.

A coin worth less than it costs to spend. At 20 sat/vB a Native SegWit input costs 1,360 sats, so a 1,000-sat coin is dust: spending it loses money. At 2 sat/vB the same input costs 136 sats, so merging it then keeps most of its value.

Amounts you paste are worked out in your browser and never sent. An extended public key is turned into addresses in your browser; only those addresses reach our server, which asks a public Bitcoin data provider for their coins, keeps the answers in memory for five minutes, and never stores or logs them. We never ask for a private key, and we never build or sign a transaction.

A transaction with hundreds of inputs is slow to sign on a hardware wallet, and some refuse it. Merge in rounds of up to 100 coins; each round saves the same amount per coin.