@StevenHarlow Thank you; we will definitely need an example PDF to look into the issue.

I'm closing this issue for now and we will reopen this when we have an example PDF to test with.

I have the same issue. The signature is not show in the viewer. Is the problem solved?
Here is a signed pdf,
https://dl.dropboxusercontent.com/u/5681461/dev/test-signature.pdf

This signed is not verified. But even with a verified valid signature, the signature field is not shown in the pdf.js viewer.

I have the same issue. In my case, the problem is only with invalid signatures. I have a pdf document with two signatures (one is valid and another one is invalid). In others pdf viewers I can see the two signatures impressed on the document, but in pdf.js I cannot. I'm sorry, I can't attach the sample document because it contains client confidential data.

EDITED: It seems that the problem is not only with invalid signatures, in my case the valid signature is a invisible sign.

I think simply this functionality is not implemented:

https://github.com/mozilla/pdf.js/blob/master/src/core/annotation.js#L527

    // Hide unsupported Widget signatures.
    if (data.fieldType === 'Sig') {
      warn('unimplemented annotation type: Widget signature');
      this.setFlags(AnnotationFlag.HIDDEN);
    }

If I remove these lines I can see the signature impressed on my document. In the case of the issue attached pdf (https://dl.dropboxusercontent.com/u/5681461/dev/test-signature.pdf) I can see the signature but it appears inversed rotate:

Visible Signature widgets usually have an appearance stream just like most other annotations, and this one has it. The flipping may be a duplicate of #5946.

Flipping problem is solved now thatt #5946 is solved.

since three years ago... any progress?

@yurydelendik pdf.js is just a viewer, Is not verifying digital signature too ambiguous? I can't understand why you do so much.

@hxlniada I think it is very important at least to show widget signature (Graphic Signature) also without verify signature.

We would also just like to see it. To say "unverified" is fine.

电子签章没显示是为什么？

因为PDF.js不支持数字签名。 查看https://verify.ink。 如果您要进行翻译，我们可以使用它来支持中文。

If you need digital signature support we created a web component and iframe wrapping our viewer that does support this. See https://verify.ink

Closing since this is a duplicate of #1076.

因为PDF.js不支持数字签名。 查看https://verify.ink。 如果您要进行翻译，我们可以使用它来支持中文。

Thank you very much for the digital signature verification you provided, but our operating environment will be a LAN, so we cannot link to the path you gave for corresponding verification and display. Is there any plug-in that can be downloaded and used? We are looking forward to your reply.

Contact info@hancock.ink for more information

I have the same problem,After a couple of rounds, people just told me to comment the following code without telling me why,

// _this3.setFlags(_util.AnnotationFlag.HIDDEN);

I have the same problem,After a couple of rounds, people just told me to comment the following code without telling me why,

// _this3.setFlags(_util.AnnotationFlag.HIDDEN);

Thank you, you saved my day