Ebook tools
Extension, EPUB cover, and batch rename — processing stays in your browser
Working files0
No files yetEPUB, MOBI, AZW3, FB2, CBZ, and similar. Cover replacement applies to EPUB only.
1
File extension
This only changes the filename extension and MIME hint — it does not convert the binary contents. Use Calibre or similar for real format conversion. Mis-matched extensions can confuse readers.