Free Local utilities
DKIM key generator
Generate local RSA-2048 or RSA-4096 DKIM keys with plain TXT or zone-file output. Copy public DNS data separately and download the private PEM key securely. No DNS publishing.
Bookmark
Use your browser’s bookmark command to save this page. It saves the tool link, not your inputs or results.
Only the tool link is copied. Inputs and results are never included.
Your inputs
Runs in your browser. Inputs and results are not uploaded or saved by this tool. Copy or download only what you intend to keep.
No DNS publishing, lookup, domain ownership check or email-delivery test occurs. Check your mail provider’s key format and rotation requirements. Copied/downloaded private keys remain your responsibility.
Your result
Ready.
Your result will appear here
Complete the inputs and run the tool. You can load a safe example to get started.
Plain text result
Sources
Sources reviewed:
How it works
Web Crypto creates a local RSA-2048 or RSA-4096 pair. Private output is PKCS#8 PEM; the public SPKI key forms selector._domainkey.domain TXT data. Single-value and quoted zone-file chunk presentations contain the same TXT value. Publish only public data; configure mail signing separately.
Assumptions and limitations
No DNS publishing, lookup, domain ownership check or email-delivery test occurs. Check your mail provider’s key format and rotation requirements. Copied/downloaded private keys remain your responsibility.
How to use this tool
Enter an ASCII domain and selector, then Generate. Keep the private key secret; publish only the shown TXT record and configure signing in your mail server separately.
Worked example
Demonstration data only. Loading an example replaces the inputs but does not run the tool.
example.com mail mail._domainkey.example.com
Frequently asked questions
What should I check before using this result?
No DNS publishing, lookup, domain ownership check or email-delivery test occurs. Check your mail provider’s key format and rotation requirements. Copied/downloaded private keys remain your responsibility.
Are my inputs or results saved automatically?
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Processing and privacy
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Privacy PolicyHelp
Enter an ASCII domain and selector, then Generate. Keep the private key secret; publish only the shown TXT record and configure signing in your mail server separately.
Runs in your browser. Inputs and results are not uploaded or saved by this tool. Copy or download only what you intend to keep.
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