Free · Private · In your browser
CBZ Reader
Open a CBZ comic archive and read it page by page, right in your browser. Nothing is uploaded, ever.
Files never uploaded Works offline Free, no signup No file size limits
How it works
- Drop your CBZ comic into the box above.
- It opens instantly, rendered right here in your browser – no upload, because a comic can be a gigabyte and nothing is sent anywhere.
- Turn pages with the arrows or your keyboard. Close the tab and nothing is left behind.
Why “no upload” matters
Every conventional converter site works the same way: your file travels to their server, sits in their queue, gets converted on their hardware, and – you hope – gets deleted afterwards. You can’t verify any of it. The FBI has even warned about free converter sites that use that upload as a way to deliver malware or harvest the documents themselves. Your books are yours; a format change shouldn’t require handing them to a stranger.
ebook.tools removes the question entirely. The converter is delivered to your browser as code and runs on your machine; the file you drop is opened from memory, transformed, and saved back – the network isn’t involved at all. That isn’t a policy promise, it’s an architecture, and you can test it: load this page, switch off your wifi, and convert. It works exactly the same, because there was never anything to send.
A private comic reader that never uploads a single page
A CBZ is the simplest thing a comic can be: a zip archive full of page images, in reading order. That simplicity is why it is the archival-safe format, and why nearly every comic app understands it. What most web comic viewers do, though, is exactly what web converters do: they upload your archive to a server and render it there. With comics that is a double problem, because a single volume can run to a gigabyte, so you are both trusting a stranger and waiting on a long upload. This reader does neither. It opens the CBZ entirely on your own machine.
Drop a .cbz and it reads the archive, sorts the pages in natural numeric order, and shows them one at a time. Move through the book with the on-screen arrows or the left and right keys on your keyboard, and the page list lets you jump anywhere. Every page is scaled to fit your screen, and because nothing is uploaded, the second comic you open works even with the network switched off, which is the honest proof that no page was ever leaving your device.
The same sandbox that protects the text readers protects this one. Each page renders inside a locked-down frame with no scripting and no network access, and the image is inlined rather than fetched, so a booby-trapped archive has nowhere to reach. Large volumes are handled a page at a time to keep memory in check, though a very large archive on a phone can still hit that device’s limits, in which case the tool tells you rather than freezing.
Got a CBR instead? That is a RAR-compressed comic, which open tools struggle with, so convert it first with the CBR to CBZ converter and open the result here. Want a copy that prints or opens on anything, from a school Chromebook to a library tablet? The CBZ to PDF converter makes one on your device.