BIP39 Seed Phrase Validator
Check recovery phrases word-by-word against the BIP39 wordlist and verify the checksum.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use BIP39 Seed Phrase Validator
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Type or paste your seed phrase into the secure input (12, 15, 18, 21, or 24 words).
- 2
Step 2. Each word is validated against the official BIP39 wordlist as you type.
- 3
Step 3. The checksum (last word's checksum bits) is verified once the word count is valid.
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Step 4. Read the result — green means a valid mnemonic, red means an invalid word or failed checksum.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about bip39 seed phrase validator.
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