# BIP39 Mnemonic

Generate a BIP39 mnemonic phrase and derive its seed.

## URL

https://ilham.dev/tools/bip39/

## What It Does

Generate a BIP-39 mnemonic phrase from a chosen word count and derive the seed from it, which is how a cryptocurrency wallet backs up a key as words. It also checks a phrase you were given for a valid checksum.

## Features

- Runs in the browser
- No login required

## Input

text input.

## Output

text output.

## Privacy

Processing happens locally in the browser.

No input data is uploaded to ilham.dev.

- Requires login: false
- Requires API key: false
- Stores user data: false


## Examples

- Is it safe to generate a wallet seed in a browser?
- Why does it reject my phrase?




## Questions

### Is it safe to generate a wallet seed in a browser?

The entropy comes from crypto.getRandomValues, so the randomness is real. The risk is the page and the machine, not the maths. For anything holding real value, generate offline on a machine you control.

### Why does it reject my phrase?

The last word carries a checksum. If one word was mistyped the checksum fails and the phrase is rejected, which is the feature working as intended.