HomeBIP39 Mnemonic Generator

BIP39 Mnemonic Generator

Generate BIP39 mnemonics locally with entropy conversion, validation, and multilingual wordlists

Generator Settings

Generate BIP39 mnemonics locally with entropy conversion, validation, and multilingual wordlist switching in the browser

Changing the wordlist retries conversion with the current input. A mismatched language will fail validation.

Conversion Workspace

Entropy

Enter hexadecimal entropy with a length between 16 and 32 bytes in multiples of 4 bytes.

Current length: 0 hex charactersBytes: 0

Mnemonic

Paste a BIP39 mnemonic to validate it and restore the matching entropy.

Words: 0

Result Summary

Current Wordlist

English

Primary Input

No input

Entropy Size

--

Mnemonic Length

--

Checksum Status

Waiting for input

Processing

Everything stays in the browser

Loading local BIP39 scripts, please wait.

Notes

  • Real wallet mnemonics are highly sensitive and should only be handled on trusted devices.
  • This tool does not upload your input, but clipboard handling after copying is still your responsibility.
  • When you switch wordlists, the same mnemonic usually will not validate in a different language.

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Documentation

What is BIP39 Mnemonic Generator

BIP39 Mnemonic Generator creates random entropy in the browser and converts it into a mnemonic phrase. It can also validate an existing mnemonic and restore the matching entropy for backup checks and recovery drills.

Key Features

  • Supports multiple BIP39 wordlists.
  • Generates random entropy and converts it into a mnemonic instantly.
  • Converts between entropy and mnemonic in both directions.
  • Copies entropy or mnemonic text for saving and testing.
  • Runs locally in the browser without external API calls.

Steps

  1. Choose the BIP39 wordlist language you need.
  2. In the entropy workflow, enter hexadecimal entropy or click Refresh Entropy.
  3. In the mnemonic workflow, paste a mnemonic to validate it and restore the matching entropy.
  4. Copy the entropy or mnemonic when you need to save or compare the result.

Use Cases

  • Checking mnemonic format before creating a blockchain wallet.
  • Verifying a paper backup or offline backup copy.
  • Testing whether a mnemonic is typed correctly before wallet recovery.
  • Preparing BIP39 sample data for blockchain development, QA, or demos.

Notes

  • Entropy must be hexadecimal, between 16 and 32 bytes, and in multiples of 4 bytes.
  • The mnemonic language must match the selected wordlist or validation will fail.
  • Entropy and mnemonics may control real assets, so never enter sensitive data on untrusted devices.
  • After copying to the clipboard, you still need to consider clipboard history or sync exposure.

FAQ

Why does the mnemonic become invalid after changing the language?

Each BIP39 language uses a different wordlist, so the same phrase usually validates only under its original language.

Does this tool upload my mnemonic to a server?

No. Conversion and validation run with local scripts inside the browser and do not depend on remote APIs.

Why does the tool show entropy instead of a wallet seed?

A BIP39 mnemonic is derived from random entropy. This tool covers entropy and mnemonic conversion, while wallet seeds usually require an extra passphrase-based derivation step.

Data is processed locally in your browser by default and will not be uploaded to any server. Upload will be clearly indicated if required.

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