When the edition you need does not exist
You already know the title. Friends quote it. The English PDF sits on your drive. The Portuguese (or Spanish, or German) edition is listed as “forthcoming” for the third year in a row.
Rights take time. Small markets get skipped. A classic can sit in Project Gutenberg in one language while your city only stocks abridged school editions.
If you own a legal PDF or EPUB, translating that file is a practical move: you keep chapters, you read a sample from the real text, and you stop waiting on a reprint schedule you do not control.
That is the job Books does at tradubook.com. Upload, pick the target language, read a free sample cut from your book, then unlock EPUB and PDF.
Useful when you search for something like Pride and Prejudice in Brazilian Portuguese or 1984 in Spanish and the shelves are empty.