Why EPUB and not MOBI or AZW3?

Amazon retired MOBI for Send to Kindle; EPUB is the format they now recommend. Their servers convert it to the Kindle's native format automatically — tanko's output validates clean against Amazon's own conversion toolchain.

Which Kindle models are supported?

All current models have profiles: basic Kindle, Paperwhite, Oasis, Scribe, and Colorsoft — each with its exact panel resolution so pages render pixel-sharp.

Can Kindle read CBZ files?

No. No Kindle model, including the Scribe and Colorsoft, has a CBZ reader, and Send to Kindle rejects the format. Convert to EPUB first, then deliver it with Send to Kindle.

Does Send to Kindle accept EPUB?

Yes. Since 2022 EPUB has been Amazon's recommended format for personal documents. The service converts it to Kindle's own format during delivery, so the EPUB itself is not what ends up on the device — which is why the file has to be structurally valid.

Why is my comic listed under Docs instead of Books?

Everything delivered through Send to Kindle is a personal document, and the Kindle files it under the Docs filter. It still gets collections, sync, and the same page rendering as a purchased comic; only the shelf label differs.

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 CBZ files on your Kindle

Kindles can't open CBZ files — but Amazon's Send to Kindle accepts EPUB and converts it perfectly on their side. Tanko turns your CBZ into a Kindle-tuned EPUB: pages sized for your exact Kindle model's screen, grayscale-optimized for e-ink, with 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) and it appears in your library like any purchased book.

How to convert CBZ to Kindle format and deliver it

Choose your Kindle model in the profile menu. Kindle (11th gen) is 1072x1448, the 2021 Paperwhite (11th gen) is 1236x1648, the 2024 Paperwhite (12th gen), Oasis and Colorsoft are 1264x1680, and Scribe is 1860x2480. Each page is resized to fit that panel, so nothing larger than the screen goes through Send to Kindle.
Set direction and spread handling. Left to right for Western comics; Auto spreads splits the occasional double-page spread into two full pages, left half first. Books that are landscape throughout are left as they are.
Convert and note the file size. The result panel shows the page count and the EPUB size in megabytes. That number decides which Send to Kindle route you can use.
Send the EPUB with Send to Kindle. The web uploader at amazon.com/sendtokindle and the desktop or mobile apps accept files up to 200 MB each. Email delivery to your @kindle.com address is capped at 50 MB per message, and the sending address must be on your approved list.
Open it from your library. Personal documents appear in the Kindle library alongside purchased books and sync across the devices on your account. The download can take a minute after delivery, because Amazon converts the EPUB to Kindle's format on its servers first.

Why a Kindle will not open a CBZ

Kindle firmware has readers for Amazon's own formats, PDF, and a few text formats, and nothing for zip archives of images. Copying a CBZ over USB puts a file on the device that the home screen never lists, and renaming it does not change what is inside.

Send to Kindle is the same story: its accepted list covers EPUB, PDF, DOC and DOCX, TXT, RTF, HTML, and single images, and it rejects CBZ, CBR, and since 2022 MOBI as well. The archive has to become one of those formats before Amazon will touch it.

EPUB is the right target because Amazon converts it on their side into the Kindle's native fixed-layout format, keeping the page order, dimensions, and cover that tanko writes into the package. A PDF would also be accepted, but Kindles render PDFs with margins and without any reading-order metadata.

Choosing the right Kindle profile

Pick the profile for the Kindle you will actually read on. Because tanko never upscales, a 1,400-pixel-tall scan converted with the Scribe profile stays 1,400 pixels tall; the larger profile only matters when the source has the pixels to fill it.

Colorsoft is the one Kindle profile that keeps color: it skips grayscale conversion, gamma, and dithering and stores the resized page as a color JPEG. Every other Kindle profile converts to grayscale, darkens midtones with a gamma of 1.8 to counter e-ink washout, and dithers to 16 gray levels.

If you own two Kindles, convert twice rather than sending one file to both. A Paperwhite-sized file shown on a Scribe gets scaled up by the device and looks soft; a Scribe-sized file on a Paperwhite is scaled down and wastes most of its bytes.

Read the guide

How to read CBR and CBZ comics on a Kindle · 8 min read
How to put manga on a Kindle without it reading backwards · 7 min read
CBZ and CBR files: what they are and how to open them · 8 min read

Frequently asked questions

Why EPUB and not MOBI or AZW3?: Amazon retired MOBI for Send to Kindle; EPUB is the format they now recommend. Their servers convert it to the Kindle's native format automatically — tanko's output validates clean against Amazon's own conversion toolchain.
Which Kindle models are supported?: All current models have profiles: basic Kindle, Paperwhite, Oasis, Scribe, and Colorsoft — each with its exact panel resolution so pages render pixel-sharp.
Can Kindle read CBZ files?: No. No Kindle model, including the Scribe and Colorsoft, has a CBZ reader, and Send to Kindle rejects the format. Convert to EPUB first, then deliver it with Send to Kindle.
Does Send to Kindle accept EPUB?: Yes. Since 2022 EPUB has been Amazon's recommended format for personal documents. The service converts it to Kindle's own format during delivery, so the EPUB itself is not what ends up on the device — which is why the file has to be structurally valid.
Why is my comic listed under Docs instead of Books?: Everything delivered through Send to Kindle is a personal document, and the Kindle files it under the Docs filter. It still gets collections, sync, and the same page rendering as a purchased comic; only the shelf label differs.
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.