Merkle Tree Generator

Build an airdrop merkle root and a proof for every entry, entirely in your browser.

The Merkle Tree Generator turns an address list (optionally with amounts) into a merkle root and a proof for each entry, ready to power an on-chain airdrop claim. It runs entirely in your browser and makes zero network requests. The output verifies against standard OpenZeppelin MerkleProof.

What it does

Builds a merkle tree from a list of addresses, or address/amount pairs.
Uses OpenZeppelin's StandardMerkleTree, so proofs verify with the standard on-chain library.
Exports a full reloadable tree and a claims file mapping each address to its proof.

Input format

Paste rows, or upload a .csv/.txt file, in one consistent format:

address: one address per line, or
address,amount: an address and an amount per line.

Every row must use the same format; mixing rows with and without an amount is an error that asks you to pick one.

Amounts are raw uint256 token units (wei-style). They are not scaled by decimals; scale by your token's decimals first. Decimal points in an amount are rejected with a per-line error.

Addresses must be unique: merkle leaves cannot repeat. Duplicates are listed as errors; clean the list first with the Address List Utilities.

Output

Root: the merkle root hash, shown prominently and copyable. This is the value you set in your claim contract.
Entries: the count of leaves.
Table: address, amount, and a copyable proof per row (display is capped at the first 200 rows).

Downloads

Full tree JSON: the complete tree dump. It can be reloaded later with StandardMerkleTree.load to regenerate any proof without re-entering the list.
Claims JSON: a compact map: { root, format, claims: { address: { index, amount?, proof } } }, convenient for a claim frontend.

Step by step

Paste or upload your address list (with or without amounts).
Generate the tree.
Copy the root for your contract and export the proofs.

Fees and gas

Free, and offline. Generating a tree sends no transactions and makes no network calls. Claiming an airdrop on-chain later costs gas, but that happens in your claim contract, not here.

Limits and safety

Leaf encoding is ['address'] or ['address','uint256'] depending on your input, matching OpenZeppelin's StandardMerkleTree.
The root commits to the exact list and amounts you provide. Regenerate and re-verify if anything changes; a different list produces a different root.
Because everything is local, nothing about your recipient list leaves the page.