Free Printable Certificates has 100 printable certificates in about twenty categories. You can download the PDF file, print the certificate, and fill in your custom information. The standard certificates are free, but they charge for editable versions.
How to get a the free printable certificates:
Visit Free Printable Certificates. You can choose one of the fifteen most popular certificates or use the category list on the left to find one. After you click on the desired certificate you need to check the box to accept the terms and conditions and click the download button. You need the free Adobe reader to open and print the certificate.
What are risks in using this site?:
You don't need to register or provide any information for the free printable certificates, so there is no risk in using the site.