# Identifying PDF Documents Converted from EPUB

**URL:** <https://discourse.devontechnologies.com/t/identifying-pdf-documents-converted-from-epub/87757>\
**Category:** DEVONthink\
**Created:** [October 2, 2026, 1:52pm UTC](https://discourse.devontechnologies.com/t/identifying-pdf-documents-converted-from-epub/87757 "2026-10-02T13:52:44Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![anton](https://discourse.devontechnologies.com/letter_avatar_proxy/v4/letter/a/d9b06d/32.png) [@anton](https://discourse.devontechnologies.com/u/anton)\
**Post date:** [October 2, 2026, 1:52pm UTC](https://discourse.devontechnologies.com/t/identifying-pdf-documents-converted-from-epub/87757/1 "2026-10-02T13:52:44Z")

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Dear Community,

I have the following use case and was wondering whether there might be a good way to approach it.

Some time ago, back when I was still using DEVONthink 3, I converted quite a large number of EPUB files to PDF using DEVONthink.

Since then, DEVONthink’s EPUB-to-PDF conversion has improved significantly, and I’d like to re-convert those older files to take advantage of the better output quality.

Is there any way to identify **all PDFs that were originally created by converting EPUB files in DEVONthink**? Ideally, I’d like to find the PDFs produced using the older conversion process so I know exactly which documents need to be converted again.

Any ideas or suggestions would be greatly appreciated.

Thank you!

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**Author:** ![BLUEFROG](https://discourse.devontechnologies.com/user_avatar/discourse.devontechnologies.com/bluefrog/32/135_2.png) [@BLUEFROG](https://discourse.devontechnologies.com/u/BLUEFROG)\
**Post date:** [October 2, 2026, 2:07pm UTC](https://discourse.devontechnologies.com/t/identifying-pdf-documents-converted-from-epub/87757/2 "2026-10-02T14:07:33Z")

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There’s no metadata on the files indicating they were previously EPUB files. I’m assuming you didn’t keep the originals. If you have backups that go back far enough – pre-conversion – and cherry-pick the EPUB files.

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<div class="post-metadata">

**Author:** ![anton](https://discourse.devontechnologies.com/letter_avatar_proxy/v4/letter/a/d9b06d/32.png) [@anton](https://discourse.devontechnologies.com/u/anton)\
**Post date:** [October 2, 2026, 2:13pm UTC](https://discourse.devontechnologies.com/t/identifying-pdf-documents-converted-from-epub/87757/3 "2026-10-02T14:13:11Z")

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I see, thanks! I guess, I’d have to go one-by-one and re-convert them on demand

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<div class="post-metadata">

**Author:** ![anton](https://discourse.devontechnologies.com/letter_avatar_proxy/v4/letter/a/d9b06d/32.png) [@anton](https://discourse.devontechnologies.com/u/anton)\
**Post date:** [October 13, 2026, 11:31am UTC](https://discourse.devontechnologies.com/t/identifying-pdf-documents-converted-from-epub/87757/4 "2026-10-13T11:31:56Z")

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I have found a good indicator of the PDF documents converted from EPUB with the “old” conversion in DT:

such PDFs don’t have ToC. The new conversion from epub does produce a nice ToC. However, the links in the ToC and in the text are not working for some reason… but the converted PDF is much better formatted!