Is my seed phrase sent to any server?

No. Every calculation runs locally in JavaScript inside your browser. The page makes no network requests after it loads. Close the tab when finished and clear your clipboard if needed.

What word counts are valid for BIP-39?

BIP-39 defines three valid mnemonic lengths: 12 words (128-bit entropy), 18 words (192-bit entropy), and 24 words (256-bit entropy). Any other count is invalid.

Does this tool validate the actual BIP-39 word list?

This tool counts words and validates the count only. It does not verify each word against the official BIP-39 word list or check the checksum bits. Use a dedicated wallet recovery tool for full validation.

What is entropy and why does it matter?

Entropy is the amount of randomness in your seed. More entropy means more possible seeds and a harder brute-force attack. A 12-word phrase has 2^128 combinations; a 24-word phrase has 2^256 — astronomically more.

Can I use this with non-English BIP-39 words?

Yes. The counter works with any language since it only splits on whitespace. However, word-list validation is English-only in most BIP-39 implementations.

Seed Phrase Word Counter

Name: Seed Phrase Word Counter
Availability: InStock
Author: Nham Vu

Paste your BIP-39 seed phrase to instantly count its words, confirm it is a valid 12/18/24-word mnemonic, and see its entropy level.

Your Seed Phrase

Paste your mnemonic below. Nothing leaves your browser.

100% local — your seed phrase never leaves this page.

Paste a seed phrase on the left to see the word count and validation result.

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Summary

Paste your BIP-39 seed phrase to instantly count its words, confirm it is a valid 12/18/24-word mnemonic, and see its entropy level.

How it works

Paste your seed phrase into the input area.
The tool counts every whitespace-separated word in real time.
It checks whether the count matches a valid BIP-39 length (12, 18, or 24 words).
The entropy level (128, 192, or 256 bits) for that length is displayed.
All processing happens entirely in your browser — no data leaves your device.

Use cases

Verify you have written down all 12, 18, or 24 words of a new wallet seed.
Check a recovered phrase before attempting to restore a wallet.
Confirm the word count when transcribing a hardware wallet backup.
Quickly audit whether a phrase you received has the correct length.
Understand the entropy and security level of different seed phrase lengths.

Frequently Asked Questions

Last updated: 2026-07-08 · Reviewed by Nham Vu