ebook.tools

    Everything runs in your browser. Press Esc to close.

    The private ebook toolbox

    Convert any ebook. Never upload it.

    Drop an EPUB, MOBI, AZW3, FB2, DOCX, PDF or comic archive. Every conversion on ebook.tools runs right here in your browser. Your files stay on your device, always.

    Files never uploaded Works offline Free, no signup No file size limits

    All tools

    Kindle
    MOBI to EPUB
    Turn old Kindle MOBI files into universal EPUBs.
    AZW3 to EPUB
    Convert Kindle KF8 books to EPUB for any reader.
    Kindle EPUB Fixer
    EPUB rejected by Send to Kindle? Diagnose and fix it.
    EPUB to MOBI
    For older Kindles that still need classic MOBI.
    EPUB to AZW3
    Kindle’s native format, for USB sideloading.
    MOBI Reader
    Read MOBI and AZW3 Kindle books in your browser.
    AZW3 Reader
    Read AZW3 and KF8 Kindle books in your browser.
    Kobo
    EPUB to KEPUB
    Faster page turns and reading stats on your Kobo.
    KEPUB Reader
    Read Kobo KEPUB books in your browser, no upload.
    Comics
    CBZ to PDF
    Comic archives to PDF, full quality or compressed.
    CBR to CBZ
    RAR comics to the open CBZ format, losslessly.
    CBZ Reader
    Read CBZ comics in your browser, page by page.
    Documents
    DOCX to EPUB
    Turn a Word manuscript into a clean ebook.
    TXT to EPUB
    Plain text or Markdown in, clean EPUB out.
    FB2 to EPUB
    FictionBook files to EPUB for any modern reader.
    EPUB to PDF
    Clean, printable PDFs with page numbers.
    PDF to EPUB
    Make PDFs readable on small screens.
    FB2 Reader
    Read FictionBook FB2 files in your browser.
    EPUB utilities
    EPUB Metadata Editor
    Fix titles, authors, series and covers – no Calibre.
    EPUB Validator
    Find out why stores reject your EPUB – with fixes.
    EPUB Reader
    Read EPUB books in your browser, nothing uploaded.

    How is this free – and private?

    Ordinary converter sites run your files through their servers, which costs them money for every conversion – money they recover with ads, accounts, size caps and “premium” tiers. And while your book sits on their hardware, you're trusting they'll handle it well.

    Every tool on ebook.tools skips the server entirely. The conversion engine is delivered to your browser as code – the same way this page's images are – and runs on your machine. Serving code is essentially free at any scale, so there's nothing to charge for, and your files can't leak from a server they never reach.

    Skeptical? Good. Load any tool page, turn off your wifi, and convert – it works exactly the same, because nothing needed the network. Read the full technical explanation.

    Frequently asked questions

    Is this really free?
    Yes – every tool, with no signup, no watermarks, no daily limits and no “pro” nag. Running conversions in your browser instead of on servers means there’s no per-file cost for us to pass on to you.
    Are my files uploaded anywhere?
    No. The converter itself is downloaded to your browser and runs on your machine; your files are opened locally and never touch the network. You can switch off your wifi mid-session and keep converting – here’s how that works.
    What formats are supported?
    In: EPUB, KEPUB, MOBI, AZW3/KF8, PRC, FB2 (including .fb2.zip), DOCX, TXT, Markdown, PDF, CBZ and CBR. Out: EPUB, KEPUB for Kobo, AZW3 and MOBI for Kindle, CBZ and PDF. Every file is identified by its actual contents, not its extension.
    Does it work on my phone?
    Yes – everything runs in the browser, so Android and iPhone work the same as desktop. Very large files (giant comic archives) are the one place phones can hit memory limits; if that happens, the tool will tell you rather than fail silently.
    Is there a file size limit?
    We impose none – there’s no upload cap because there’s no upload. The practical ceiling is your device’s memory, which comfortably handles typical books and multi-hundred-megabyte comic archives.