We're supporting EPUB3 for the vast majority of books! At the same time we also have a "Plain Text" version for each as in a sense it's the most robust. PdFs are in the works!

That's cool. I'll have to read up on EPUB3—I'm not familiar with it.

(I worked on iBooks for the Mac like 15 years ago—it's where I got to dive into the ePub format. A lot has changed in the standard since I am sure.)

EDIT: looks like EPUB3 has a "paginated" mode as well as more sophisticated layout tags.

Also appears to have support for ruby and vertical writing modes. This was not yet supported in WebKit when I worked on iBooks. Somehow, this white guy from Kansas (who knows no language other than English) got tapped to implement the vertical TOC for Asian languages. Also tasked with annotating the ePUB pages to display (also vertical) ruby text…

As others here have mentioned, https://standardebooks.org/ is excellent and my understanding is that they use Gutenberg books as a source for theirs but done up much nicer.

You can contribute to Standard Ebooks by finding OCR errors, then pushing your fixes to https://github.com/standardebooks

Source can be anything with the original text, but, more often than not, ends up being PG.

Check out Standard eBooks. They take the text from Gutenberg and add a level of polish to the ePubs.

I on the other hand prefer epubs for fiction. I mostly read on the phone.

The common issue with PDFs is that e-readers generally have terrible support for them.

PDF coming this year.

I have got quite a few books over the years from Gutenberg, and the epubs have been fine 0 even of illustrated ones.

I like plain text. You can always post process it into any other format you prefer.

it's also very "accessible" - good for assistive technologies and people with "ou-of-the-ordinary" requirements

Well, the problem is that you lose then all the semantic information that was encoded into the HTML or ePub versions. Those tend to be better for assistive tech users.

Not really, given that it can’t represent even basic formatting such as bold or italic text, chapter markers etc.

As an output format it’s ok, but as an input format, it’s almost as bad as PDF.

I love, love, looove the fact that I can have a book's html version on project gutenberg bookmarked and continue to read across devices without ever having to login. I use the browser's inbuilt capability extensively to enhance my reading experience (fonts, backgrounds, text to speech, print formatting, share snippets). None of this is a good experience with pdf, epub or any other format.

I've read more (meaningful) text on PG than any other digital platform. Huge fan. Thanks for all the work and for keeping it clean and free

Interesting. Do you "just" use the browser's built-in capabilities or also some browser extensions?

I just use the built-in capabilities these days as everything that I would need is in there. This was not true many years ago when I did use some browser extensions.

check it again. most books have epub avalible

This is covered in the FAQ - https://www.gutenberg.org/help/faq.html#why-is-project-guten...

And as another person noted, the vast majority of books have HTML, EPUB, Mobi formats. We are also looking at both KEPUB (Kobo) and PDF which will probably come in the future.