# Verifying Sign with Singpass signatures
Sign with Singpass signatures can be verified using the Adobe Acrobat Reader application. **This should already be installed on your government devices**. However, if you are verifying on a non-government device, please:
* download Adobe Acrobat Reader [here](https://get.adobe.com/uk/reader/)
* load [Singpass root signing certificates](https://guide.signify.gov.sg/user-guides/certificate-guide/loading-singpass-root-signing-certificate)
{% hint style="info" %}
Please ensure that your agency does not modify the file in transit (content disarm and reconstruction) as this will render the file not verifiable.
{% endhint %}
***
### Verifying signatures
Please follow the steps below to verify a Sign with Singpass signature.
1. **Open up signed document on Adobe Acrobat Reader**
2. **Check if green tick with "Signed and all signatures are valid"**
{% hint style="info" %}
If you see "Certificate validity is unknown", this is because you do not have the Singpass root signing certificate on your device. Please refer to this [guide](https://guide.signify.gov.sg/user-guides/certificate-guide/loading-singpass-root-signing-certificate) to install the Singpass root signing certificate.
{% endhint %}
3. **Go to signature panel**
In signature panel, each signature should show:
* Document has not been modified
* Signer's identity is valid
* The signature includes an embedded timestamp
* Signature is long term validation (LTV) enabled
Document owner should "click to view this version" to visually inspect that the contents of the document version is signed correctly.
4. **Click on each signature and inspect certificate**
Go into signature properties
Show signer's certificate
Certificate should include the following:
* Singapore National Root CA - G1
* Singapore NDI Intermediate CA 1 - G2
* Signer's full name (as per NRIC)
Click the full name and then "details"
Check under subject that signer's name and last 4 characters of NRIC is correct.
