# Is PDF data transmit to owned server side or client side only?

**URL:** https://pdfjs.community/t/is-pdf-data-transmit-to-owned-server-side-or-client-side-only/2978
**Category:** Technical Support
**Tags:** pdfjs-express
**Created:** [December 4, 2023, 6:17am UTC](https://pdfjs.community/t/is-pdf-data-transmit-to-owned-server-side-or-client-side-only/2978 "2023-12-04T06:17:51Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![mary.j.balagtas](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@mary.j.balagtas](https://pdfjs.community/u/mary.j.balagtas)
#### Post date: [December 4, 2023, 6:17am UTC](https://pdfjs.community/t/is-pdf-data-transmit-to-owned-server-side-or-client-side-only/2978/1 "2023-12-04T06:17:51Z")

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Good day,

Once I uploaded a pdf, and updated the context (highlight, comment etc). Where does the data going ? Is it client side only or this goes to your server?

Thank you.

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### Author: ![kkim](https://avatars.discourse-cdn.com/v4/letter/k/3ab097/32.png) [@kkim](https://pdfjs.community/u/kkim)
#### Post date: [December 4, 2023, 10:06pm UTC](https://pdfjs.community/t/is-pdf-data-transmit-to-owned-server-side-or-client-side-only/2978/2 "2023-12-04T22:06:38Z")

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Hi there,

Thanks for contacting pdf.js express forums,

Pdf.js express collects anonymous telemetry data, you can see the details in this post here:

> [@What does the call to "https://pi.pdfjs.express/events" means?](https://pdfjs.community/t/what-does-the-call-to-https-pi-pdfjs-express-events-means/1518/4):
>
> Hey there, Starting with version 8.0 we started collecting telemetry data. This is completely anonymous data that we use to see how our customers are using the product to help us improve. We do not track any personally identifiable information about the user, and we do not have any access to their documents or anything like that. We track things like: Number and type of annotations created Number of documents loaded Number of application loads Country of origin This cannot be turned off. Th…

You should be able to see it in the network panel, i.e.:

 ![image](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/2X/7/784e834cc79041b4e30cd07023dbcbd9586a0f91.jpeg)

Best regards,  
Kevin Kim

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### Author: ![mary.j.balagtas](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@mary.j.balagtas](https://pdfjs.community/u/mary.j.balagtas)
#### Post date: [December 5, 2023, 1:41pm UTC](https://pdfjs.community/t/is-pdf-data-transmit-to-owned-server-side-or-client-side-only/2978/3 "2023-12-05T13:41:01Z")

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Good day,

Do you save a copy of the document uploaded? Comments? Annotation? Highlighted etc?

Thanks.

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### Author: ![kkim](https://avatars.discourse-cdn.com/v4/letter/k/3ab097/32.png) [@kkim](https://pdfjs.community/u/kkim)
#### Post date: [December 5, 2023, 3:35pm UTC](https://pdfjs.community/t/is-pdf-data-transmit-to-owned-server-side-or-client-side-only/2978/4 "2023-12-05T15:35:36Z")

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Hi there,

If you use the express APIs, then the document will be saved on the server for a set time:

> **[PDF.js Express Utility API | Documentation](https://pdfjs.express/documentation/utils)**

Best regards,  
Kevin Kim

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### Author: ![mary.j.balagtas](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@mary.j.balagtas](https://pdfjs.community/u/mary.j.balagtas)
#### Post date: [December 12, 2023, 12:58pm UTC](https://pdfjs.community/t/is-pdf-data-transmit-to-owned-server-side-or-client-side-only/2978/5 "2023-12-12T12:58:01Z")

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Noted. Thank you the link you’ve sent is helpful.