Does converting an EPUB in the browser upload it
On ReadyEPUB, EPUB to PDF runs in the browser you already have open. Chapters, paragraphs, and pictures do not pass through a ReadyEPUB server. There is no account server for receiving books, and there is no sign-in and no registration. After you press convert, this device builds the new file, and you download it yourself. The book file is not uploaded to ReadyEPUB.
What you send later is the file you downloaded. The original EPUB stays in its folder unless you move or delete it. This page takes one file at a time. Download the result before you close the page. A result that is not downloaded lives only for this visit. Refresh or close the page and it is gone. The sample on the page is a short passage made in this browser so you can try a conversion. It is not a book fetched from somewhere else.
Conversion does not upload the book to ReadyEPUB. The download is a new file this browser just made. The original EPUB is still where it was.
A PDF export reads fonts from this site
When an EPUB becomes a PDF, this browser reads the fonts it needs for the characters in the book from this site, then writes the words into the new PDF. What it reads is a font, not the whole book sent elsewhere to be typeset. Title, author, and language code are written into that new PDF too. How files are handled states the boundary: books are not uploaded to ReadyEPUB, and there is no sign-in. If the fonts do not load this time, this conversion does not finish, and the page says it did not convert. Try another file, or check that the page can open. Do not describe this as a server laying out the book for you.
Opening the page also touches the network. That visit is sent to 51.LA for a count. The count is that someone opened the page, not your EPUB and not the PDF you just downloaded. This note only says 51.LA. Do not turn “the book is not uploaded” into “this computer is never online.” The page has to open, a PDF export has to read fonts, and the visit is counted once. None of those three sends the text of the book to ReadyEPUB.
What comes in is a font from this site. What does not go up is your book.
A PDF comes back as the text you can select
The other way, PDF to EPUB, keeps text you can already select in the PDF. If a scanned page is only a picture, the words cannot be taken out. There is no separate recognition step. A complex layout becomes paragraphs. Columns, headers, and footnotes are not put back as they were. Over 300 pages, the page says there are too many pages for one pass in this browser.
- Text you can select is gathered into headings or paragraphs, line by line.
- Words on a scanned page cannot be taken out. There is no recognition step.
- Over 300 pages, the page says this pass cannot take it.
One file, and nothing over 40 MB
The converter takes one file at a time. Over 40 MB, the page says this browser cannot take it. That is not a server refusing the file. This page does not accept a larger one. In a CBZ comic archive, JPG, PNG, GIF, and WEBP are ordered by filename, one picture to a page. Over 300 pictures, it stops on the same “too many pages” line. Both checks happen in your browser. An archive that will not open, or one with none of those pictures, gets the message that it did not convert, or that the file has no text that can be converted.
You can change the title, author, and language code before converting. When a file is added, details that can be read are filled in. A field you have edited is not overwritten. You are editing the details of the file you are about to download, not the original in your folder. If the extension does not match, the page asks you to choose a file of that format.
When an EPUB is converted, chapter titles can go to PDF, HTML, plain text, Markdown, and FB2, but each format keeps different things. A PDF writes the words page by page. PNG and JPG with a readable width and height are written into the new file. Other pictures this browser can draw are drawn to PNG first, then written in. A picture it cannot draw is skipped. HTML keeps headings and paragraphs. Scripts and styles do not come along. Plain text keeps paragraphs. Markdown marks headings with symbols. FB2 uses its own chapter structure. These are new files rewritten on this device. The original EPUB is not renamed in place.
Look three times before you send it
- You downloaded a new file. Is the original EPUB still where it was?
- If the source is a PDF, can you select the words? A scan you cannot select does not become text by itself.
- Did you download the result before closing the page? After a refresh, the copy you did not save is gone.
If the book is not in yet, go back to the converter, drop the EPUB in, and open EPUB to PDF. To see the boundary first, read how files are handled. One file, then download. Later notes will cover text inside a PDF, headings and pictures in a DOCX, and how a comic archive becomes one picture per page.
What you send is the file you downloaded. The other person receives a new file, not a copy stored on ReadyEPUB, because ReadyEPUB did not keep your book. You still hold the original. To convert again, open this page again. The file still comes from your own folder.