Certificate types compared
Code Signing Certificate vs SSL Certificate: What’s the Difference?
An SSL certificate proves a website’s identity and encrypts the connection; a code signing certificate proves who published a piece of software and that nobody changed it. They use the same technology but are issued, validated and trusted for different jobs.
Code signing certificate vs SSL certificate: the short answer
In the code signing certificate vs SSL question, the difference is the job. An SSL/TLS certificate secures the connection between a browser and a web server. A code signing certificate puts a verified publisher name and a tamper-proof seal on software, scripts and drivers. Both are X.509 certificates from a public certificate authority (CA), but each is only valid for its own purpose.
Validation differs as well. A DV SSL certificate only needs proof that you control the domain. A code signing certificate always needs proof of who you are: the CA verifies an organization through official records, or an individual developer through identity documents, before it issues anything.
That is why there is no single “SSL code signing certificate”. If you run a website and ship software, you need one of each. For the basics of the web side, see what an SSL certificate is.
| Aspect | SSL/TLS certificate | Code signing certificate |
|---|---|---|
| Protects | Data in transit to a website or server | Integrity of files you distribute |
| Proves | Control of a domain (plus organization for OV/EV) | Identity of the publisher (person or organization) |
| Checked by | Browsers, apps and servers during the TLS handshake | Operating systems and runtimes when a file is downloaded or run |
| Key usage (EKU) | Server Authentication | Code Signing |
| Private key storage | On your server | Certified hardware (FIPS 140-2 Level 2 or higher) since 1 June 2023 |
| Validation options | DV, OV, EV | OV, EV (no domain-only option) |
Sign your software with a trusted publisher name
Compare OV and EV code signing certificates from Sectigo and DigiCert, delivered for hardware-based key storage.
Compare code signing certificatesCan you use an SSL certificate for code signing?
No. An SSL certificate cannot sign code, because its extended key usage (EKU – the field that lists what a certificate may be used for) only allows server authentication. Windows, Java and other platforms check that field and reject a signature made with the wrong type of certificate.
The trust paths differ too. Browsers decide whether to trust SSL certificates through their root programs. Operating systems decide whether to trust code signatures, and they also judge the publisher’s reputation. A certificate built for one system simply has no standing in the other, even when the same CA issued both.
Tip: The reverse is also true. A code signing certificate cannot secure a website, and a self-signed certificate does not help users either: their systems will still show “unknown publisher”.
What a code signing certificate does
Names the publisher
Users and admins see your verified person or company name instead of “unknown publisher” in install and security prompts.
Proves integrity
The signature breaks if anyone changes a single byte after signing, so tampered installers are detected.
Survives expiry with timestamping
A trusted timestamp records when you signed, so the signature stays valid after the certificate itself expires.
Where code signing matters: SmartScreen, Gatekeeper and more
On Windows, signed installers, executables and drivers show your name in User Account Control prompts, and Microsoft Defender SmartScreen builds reputation for your files over time. Unsigned downloads are far more likely to trigger warnings. The practical steps with SignTool and timestamping are in our guide to sign Windows applications.
macOS works differently. Gatekeeper, Apple’s check for downloaded apps, expects a Developer ID certificate issued by Apple itself, not one from a public CA. Publicly trusted code signing certificates cover Windows software and drivers, Java archives, Microsoft Office macros, PowerShell scripts and similar platforms.
Code signing certificates: OV and EV
For developers Sectigo
Sectigo Code Signing Certificate
- Verified publisher name
- Timestamped signatures
- Hardware token or HSM
from $270.33 / year
Enterprise Sectigo
Sectigo EV Code Signing Certificate
- Extended Validation (EV)
- Kernel driver portal eligible
- Hardware-protected key
from $354.33 / year
Popular choice DigiCert
DigiCert Code Signing Certificate
- Organization Validation (OV)
- Verified publisher name
- Hardware token or HSM key storage
$469.99
Highest trust DigiCert
DigiCert EV Code Signing Certificate
- Extended Validation publisher identity
- Hardware-protected private key
- Removes Unknown Publisher warnings
$658.99
OV or EV code signing: which do you need?
Choose OV code signing for most applications and EV when a platform or customer requires it. Since 2024, Microsoft has treated EV-signed files the same as OV-signed files in SmartScreen: neither gets instant reputation, and both build it as users download and run your software.
EV still has a role. It involves stricter identity checks under the CA/Browser Forum’s EV rules, and Microsoft’s Hardware Dev Center requires an EV certificate on the account before you can submit drivers for attestation signing or Windows Hardware Compatibility Program certification.
| Good fit for OV | Pick EV if |
|---|---|
| Desktop apps, installers and tools from a registered business or individual developer | You submit kernel-mode drivers through Microsoft’s Hardware Dev Center |
| Java, Office macro and script signing | Customers or procurement rules ask for EV-level vetting |
| Teams that want the lower-cost option with the same SmartScreen treatment | You want the most extensive identity validation available |
Hardware rules apply to both. Since 1 June 2023, the private key of any publicly trusted code signing certificate must be generated and stored on certified hardware: a USB token, a hardware security module (HSM) or a cloud signing service. Details are in our overview of code signing key storage requirements. As of March 1, 2026, each code signing certificate is valid for at most 460 days under CA/Browser Forum ballot CSC-31.
Common mix-ups between SSL and code signing
Most confusion comes from the shared vocabulary: both are “certificates”, both come from the same CAs, and both use public and private keys. What each one is allowed to do is fixed when the CA issues it, so these common assumptions do not hold.
- An OV or EV SSL certificate cannot sign software, even though your company name is in it.
- A wildcard or multi-domain SSL certificate covers hostnames, not files.
- Code signing does not encrypt your software; it proves origin and integrity.
- A signature shows who published a file, not that the file is free of bugs or malware.
- One CA account can hold both certificates, but they are always two separate certificates.
Do you need both an SSL and a code signing certificate?
Yes, if you run a website and also ship software. The SSL certificate protects your download page and customer logins; the code signing certificate protects the files people download from it. Neither covers the other’s job.
- Website only: an SSL/TLS certificate.
- Software only, downloaded from a third-party store or portal: a code signing certificate.
- Website plus your own downloads or updates: both – and keep the code signing key on its token or HSM, never on the web server.
Compare validation levels, token delivery and terms across our code signing certificates.
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