> For the complete documentation index, see [llms.txt](https://docs.leather.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.leather.io/sbtc/bridge-sbtc.md).

# Bridge BTC to sBTC

Bridge BTC to sBTC from the Swap screen in the Leather extension, with the fees and limits that apply.

Bridging sends BTC to an sBTC deposit address on Bitcoin. The sBTC signers then mint sBTC to the Stacks address of the same Leather account.

## Bridge BTC

1. On the Home screen, click "Swap".
2. Click the asset you pay with (STX by default) and select "BTC". Leather sets sBTC as the asset you receive.
3. Enter the amount of BTC.
4. Click "Continue".
5. Check the review screen and click "Confirm".

On [app.leather.io/sbtc](https://app.leather.io/sbtc), "Bridge" opens the same form with BTC and sBTC selected.

After you confirm, the screen reads "Swap initiated" and Leather opens the Activity tab. The deposit shows "Pending deposit" and then "Pending mint". Once the signers mint it, sBTC appears in the Tokens list on the Home screen.

## Fees

A bridge costs two fees:

* **Network fee:** the fee for your deposit transaction on Bitcoin. The review screen shows it under "Estimated fees".
* **Signer fee:** the Bitcoin fee the signers pay to move your deposit into the sBTC reserve. They take it from the deposit, so you receive less sBTC than the BTC you send. Leather caps it at 80,000 sats (0.0008 BTC) in the deposit.

The amount you receive on the review screen is an estimate after the signer fee. Leather bases it on the current high Bitcoin fee rate. Neither fee goes to Leather.

## Limits

The sBTC protocol sets a minimum and a maximum per deposit, and a cap on the total sBTC supply. Leather reads these limits when you enter an amount and does not let you continue with an amount outside them.

## If a deposit fails

A deposit the signers do not mint shows a "Reclaim" link in the Activity tab. It opens [sbtc.stacks.co/activity](https://sbtc.stacks.co/activity), where you reclaim the BTC. A deposit can be reclaimed 950 Bitcoin blocks (about six and a half days) after it confirms.

With a Ledger wallet, the review screen warns: "If a BTC → sBTC bridge fails, Ledger devices cannot recover the funds." A reclaim needs software access to your Ledger key.

## When the bridge is unavailable

The bridge runs on the Swap screen, so it needs mainnet and an account with Stacks and Bitcoin keys. See [Integrated Swap Disabled](/wallet-and-security/integrated-swap-disabled.md).

Leather does not operate the sBTC bridge.

## Related

* [Get sBTC](/sbtc/get-sbtc.md)
* [Withdraw or move your sBTC](/sbtc/withdraw-sbtc.md)