Online flyer dynamic template

1. I have some flyer design templates and want to put on the webpage and let my clients change the pictures and wording to create their PDF flyer. 2. We continually release some new designs so we need to upload the new templates to our server. 3. We need to setup a client management system to let client open account and login. 4. The templates are currently in PSD format but we can use other formats to meet programming requirements. 5. We need to create categories to upload different designs. Clients can select a category first, such as: single page, postcard, or booklet. Then select a template from this category. 6. After client selects a design template, he can click a image in the design then there is a small window pop up to let him upload his picture. If the client's picture aspect ratio is different from template picture, he can crop is picture to fit the template. 7. Client's contact information on the flyer won't be change very often. So client can save their own template. Next time he just need to change the picture and wording for his new flyer. Please see the our currently samples. Technical Requirement Operation OS: Windows server 2012 Programming Language : C#, java