Certificate Chain Builder
Paste certificates in any order — get them sorted leaf → intermediate → root, missing links identified, and a ready PEM bundle out.
✓ runs 100% in your browser — no data leaves this pageFrequently asked
What order should a PEM bundle be in?
Leaf first, then each issuer up to (optionally) the root. Most servers send everything except the root.
Signature verification?
Ordering uses key identifiers and names — cryptographic verification of signatures isn't performed in-browser. For trust decisions, verify with openssl verify.