Download certificates from multiple domains at once
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About Certificate Bulk Download
The Certificate Bulk Download tool allows you to fetch SSL/TLS certificates for multiple domains simultaneously. Enter one domain per line and instantly download all certificates along with issuer details and expiry dates. Perfect for migrating certificates, auditing your infrastructure, or backing up certificates from multiple servers.
How to Use
1Enter domain names in the text area, one per line.
2Click Download All to fetch certificates for all listed domains.
3Review the results showing each domain's certificate details and download them individually.
Use Cases
•Bulk export certificates for migration to a new server or provider
•Audit certificate issuers and expiry dates across your entire domain portfolio
•Create offline backups of all your website certificates for disaster recovery
Frequently Asked Questions
There is no hard limit, but we recommend downloading up to 100 domains per batch for optimal performance. Each certificate fetch takes approximately 1-2 seconds depending on network conditions.
The tool downloads the full certificate including subject, issuer, validity period, and public key information. Results are displayed with domain name, issuer, and expiry date for each certificate.
No, the bulk download tool only retrieves public certificate data from remote servers. Private keys are never transmitted or accessible. Use our Certificate Backup tool to export your own stored certificates with keys.
No, only the leaf certificate as the server sends it — the same single certificate a visitor receives. If the server is configured correctly that transmission includes the intermediates, and what you get is everything needed for the connection. If it is missing them, the download will look short, which is precisely the problem the chain pages on this site help you confirm.
Three practical jobs. Before deploying a new certificate, save what is currently live so you can restore it if the change goes wrong. After deploying, download again and compare to prove the server picked up the new file. And periodically, keep dated copies as a record of what was served when, which is the kind of evidence an incident review or an audit asks for weeks later.
Each domain is fetched independently, so a single failure never ends the batch. Errors name their domain and the reason — DNS resolution failure, refused connection, timeout, or no certificate returned. Run it against that domain alone with the certificate checker, which reports the failure in more detail, before assuming the batch itself is at fault.
The download reports what is being served and makes no trust judgement. A certificate can be correctly retrieved and still be expired, self-signed, or issued by an unknown authority. Use the CA trust page for the verification verdict, and the expiry predictor for the deadline; this page is about capturing the material, not endorsing it.
Practical rather than documented: the page processes your list sequentially, so time scales with the number of domains and each failing one consumes its full timeout. Splitting a long list into several batches keeps any single run responsive and makes a partial failure obvious, which is easier to work with than one large run that appears to hang.
How the Download Works
Enter a list of domains and this page connects to each one in turn, retrieves the certificate it serves, and presents it as PEM alongside the identifying details. Failures are reported per domain instead of stopping the batch.
1Connect to each domain and pull its leaf certificate, exactly as a visitor would receive it. That means the output matches what your server actually serves, which is the useful case: verifying before and after a deployment, or archiving what is live.
2Record identity alongside the PEM — subject and issuer common names, the validity window, and the serial in hex — so an archive is self-describing months later when the filename no longer tells you anything.
3Keep going past failures. One unreachable host is recorded as an error naming that domain, and the remaining downloads continue, ending with a count of successes and failures so an incomplete batch is visible rather than silently short.
These are leaf certificates only — whatever the server sends on the wire. A server omitting its intermediate appears here without one, which is the single most common cause of the incomplete-chain failures the chain pages on this site diagnose.
Tips & Best Practices
•Use bulk download to backup certificates from multiple servers
•Schedule regular bulk downloads for certificate inventory management
•Verify downloaded certificates match what is deployed on servers
•Store bulk downloads securely as they contain certificate information
Technical Details
Capacity: Download certificates from up to 100 servers simultaneously Format: PEM, DER, and PFX certificate file downloads Batch: Parallel downloads for fast bulk operations Output: ZIP archive containing all downloaded certificates
