Annotation data can be written into PDF. For cloud synchronization, annotations can be exported as a JSON file, transfer and save it on the server, and then reload to continue editing. This method only requires one original PDF file and only transfers a small amount of annotations, which can save a lot of storage and broadband costs.

Yes, please contact us. We will provide a 7-14 days trial version that can be embedded into your app to see the layout and features effects.

Because we use advanced data management methods, annotations and PDFs can be saved separately. A 50 MB or bigger pdf file can be viewed and edited well in our library. And you can try your file from your local computer on our demo page.

Our solution supports various basic annotations such as highlight, underline, signature, brush, text box, etc., and supports rearranging pages. You can also name custom features requirements, welcome to contact us.

Including long time debugging to ensure our library in your application works like our demo site. We will also provide detailed modification guidance for your customized needs, such as which line of code should be modified.

We will sign a cooperation contract with your company as needed, and payment can be made through Paypal and bank transfer.

Yes, the buttons and styles of the comments are simple HTML and CSS, which can be easily modified. We will provide detailed modification instructions, such as which line of code should be modified.

Yes, we can provide various forms of technical support, including message, call and video meeting.

Yes, we can help with translations as long as the corresponding translation is provided.

We are always paying attention to the updates of pdf.js, most of its updates are in some annotation functions, but we rewrote the annotations by ourselves, so there were no updates for us actually.

In addition, the version we are currently using is new enough and stable enough, and it has better performance on many old version browsers than the latest versions, our clients need so for their products.

Of course, if you find any rendering problems later during use and updating to the official version can solve them, we will be happy to update it for you free of charge.

批注数据可以写入到PDF中。针对云端同步的场景，可以单独将批注文件导出为JSON文件，传输并保存于服务器，之后加载回显后可继续编辑批注。 这样的方式仅需一个PDF原文件，只传输很小体积的批注，可以节约很多的存储和宽带费用。

有的，欢迎联系我们，我们会提供7-14天的试用版本， 可以嵌入到你们的应用中查看布局和功能效果。

因为我们使用先进的数据管理方法，注释和 PDF 可以分开保存，所以50 MB 或 更大的 PDF 文件可以在我们的库中很好地浏览和编辑。您可以在我们的演示页面上从本地计算机试用您的文件。

我们的方案支持高亮、下划线、签名、画笔、文本框等各种基础批注，并且支持修改编辑页面顺序等。同时支持各种自定义功能的开发，欢迎咨询。

包括长时间的调试以确保您的应用程序中的库像我们的演示站点一样工作。 针对定制化需求，我们会提供详细的修改指导，例如应该修改哪一行代码。

我司会与贵司签订合作合同，付款通过双方对公账户完成。

是的，批注的按钮和样式都是简单的HTML和CSS，可以很方便的修改，我们会提供详细的修改指导，例如应该修改哪一行代码。

是的，我们可以提供各种形式的技术支持，包括信息、通话和视频会议等。

是的，只要提供了对应的翻译，我们可以帮助翻译。

我们一直在关注pdf.js的更新，它的更新大多是在一些注释函数上，但是我们自己重写了注释，所以对我们来说其实没有更新。

另外，我们现在使用的版本足够新，足够稳定，在很多老版本浏览器上的表现都比最新版本要好，我们的客户的产品需要这样。

当然，如果您在使用过程中发现任何渲染问题，更新到正式版可以解决，我们很乐意免费为您更新。