Why can't I just sideload the CBR?

Kindle firmware has no CBR reader. Converting to EPUB and delivering via Send to Kindle gets you a native library book — with sync, collections, and correct page rendering — instead of a workaround.

Which Kindle models are supported?

All current models have profiles: basic Kindle, Paperwhite, Oasis, Scribe, and Colorsoft — each with its exact panel resolution.

Can I email a CBR to my Kindle?

No. The Send to Kindle email gateway rejects CBR, CBZ, and other archives. Convert to EPUB first; the EPUB can be emailed if it is under 50 MB, otherwise use the app or the web uploader.

Will color comics look right on a regular Kindle?

They will be readable in grayscale: color is converted by luminance, then dithered to 16 levels for e-ink. Colors of similar brightness merge, so some lettering effects flatten. The Colorsoft profile keeps the color for that device.

Is the Kindle Scribe worth it for comics?

Its 1860x2480 panel is the largest Kindle and shows a US comic page at close to print size. It only helps if the source pages are large enough to fill it, because tanko never upscales — a 1,200-pixel-wide scan stays 1,200 pixels wide.

Do my files get uploaded anywhere?

No. Conversion runs entirely in your browser — the file never leaves your device. That's also why there are no size limits or queues.

Yes. Single-file conversion with every device profile and every option is free, with no sign-up and no watermarks.

Read CBR files on your Kindle

Kindles can't open CBR archives, and Amazon's Send to Kindle won't accept them either. The path is CBR → EPUB → Send to Kindle, and tanko does the whole first leg in your browser: RAR extraction, pages resized to your exact Kindle model, e-ink grayscale optimization, correct reading order and cover.

Drop a CBZ, CBR, or PDF here

or click to choose a file · converted in your browser, never uploaded

Device

Reading direction

Right to leftManga — pages and split spreads read right-to-leftLeft to rightWestern comics and webcomics

Two-page spreads

AutoSplit two-page spreads; landscape-format books stay wholeAlways splitEvery landscape page becomes two pagesNever splitLandscape pages stay whole

Convert below, then send the EPUB through Send to Kindle (web, app, or email) — it lands in your library like any purchased book.

How to convert CBR to Kindle format and get it onto the device

Pick your Kindle from the profile list. Pages are resized to that Kindle's panel: 1072x1448 for the basic Kindle, 1236x1648 for Paperwhite, 1264x1680 for Oasis and Colorsoft, 1860x2480 for Scribe.
Drop the CBR. The RAR archive is unpacked in the browser by a WebAssembly build of unrar; nothing leaves your machine. Direction can stay on left to right for Western comics.
Download and check the size. The result panel shows the page count and megabytes. Keep that number in mind for the next step.
Deliver through Send to Kindle. The Send to Kindle desktop app is the least fuss: drag the EPUB onto it, pick the device, done, with a 200 MB per-file limit. The web uploader has the same limit; emailing to your Kindle address works up to 50 MB per message.
Wait for the conversion to land. Amazon converts the EPUB to Kindle format on delivery, so the book can take a minute or two to appear. It shows under Docs in the library and syncs to any other Kindle on the account.

Why Send to Kindle rejects CBR files

Send to Kindle accepts EPUB, PDF, Word documents, plain and rich text, HTML, and individual images. A CBR is a RAR archive, and archives of any kind are not on the list, so the upload is refused before it starts; renaming the file to .zip does not change the bytes and is refused too.

There is no CBR reader in Kindle firmware either, so copying the file over USB just parks it in storage where the library never shows it. Something has to unpack the pages and repackage them as a document type Amazon understands, and that is the job tanko does before you ever open Send to Kindle.

The reason to go through Send to Kindle rather than USB even for the finished EPUB is that Amazon's delivery path is what produces a native Kindle book: it converts the EPUB, files it in your library, and syncs position across devices. A sideloaded EPUB is not opened by the Kindle at all.

Color comics on a black-and-white Kindle

Most CBR files are Western comics in full color, and every Kindle except the Colorsoft shows them in grayscale. Tanko converts color with the Rec. 601 luma formula, which weights green most heavily; a red caption on a green background can end up close in tone, so lettering that depended on color contrast may lose some punch.

After the grayscale step each page gets a levels pass (skipped on pages that already span the full range), a gamma of 1.8 to darken midtones, and 16-level dithering. Modern digital comics with clean gradients benefit most from the dithering, since gradients are exactly what bands on undithered e-ink.

On the Colorsoft profile all of that is skipped: pages are resized and saved as color JPEGs. The Colorsoft's color layer is 150 ppi against 300 ppi for grayscale, so fine color detail is softer than the line art, which is a property of the panel rather than the file.

Read the guide

How to read CBR and CBZ comics on a Kindle · 8 min read

Frequently asked questions

Why can't I just sideload the CBR?: Kindle firmware has no CBR reader. Converting to EPUB and delivering via Send to Kindle gets you a native library book — with sync, collections, and correct page rendering — instead of a workaround.
Which Kindle models are supported?: All current models have profiles: basic Kindle, Paperwhite, Oasis, Scribe, and Colorsoft — each with its exact panel resolution.
Can I email a CBR to my Kindle?: No. The Send to Kindle email gateway rejects CBR, CBZ, and other archives. Convert to EPUB first; the EPUB can be emailed if it is under 50 MB, otherwise use the app or the web uploader.
Will color comics look right on a regular Kindle?: They will be readable in grayscale: color is converted by luminance, then dithered to 16 levels for e-ink. Colors of similar brightness merge, so some lettering effects flatten. The Colorsoft profile keeps the color for that device.
Is the Kindle Scribe worth it for comics?: Its 1860x2480 panel is the largest Kindle and shows a US comic page at close to print size. It only helps if the source pages are large enough to fill it, because tanko never upscales — a 1,200-pixel-wide scan stays 1,200 pixels wide.
Do my files get uploaded anywhere?: No. Conversion runs entirely in your browser — the file never leaves your device. That's also why there are no size limits or queues.
Is this really free?: Yes. Single-file conversion with every device profile and every option is free, with no sign-up and no watermarks.