Online tool

Crop manga margins

Choose a CBZ, EPUB, or ZIP comic archive, or image files. Trim excess white margins for a more full-screen reading experience, then export with the reading size and quality you prefer.

Choose files

Select a CBZ / EPUB / ZIP archive or image files

Set the result

Choose size, padding, and quality

Download

Packaged as ZIP / CBZ / EPUB in one click

① Select files

Supports CBZ / CBR / EPUB / ZIP comic archives, or image files.

Click to select comic archives or image filesCBZ · CBR · EPUB · ZIP · JPG · PNG · WebP · TIFFMultiple files supported · Up to 300 MB per file

② Output format

*Kindle native system only recommends the official AZW3 format—lossless quality with guaranteed full-screen reading; if your device is jailbroken, use KOReader

AZW3Full-screen Kindle comic output, ready for USB sideloadEPUBE-book format for Kindle / KoboMOBIExperimentalUse KOReader after jailbreak for full-screen readingCBZComic-reader format built on ZIPZIPStandard archive, opens on phones and computers

③ Crop settings

Choose your device resolution

Keep margins

LeftpxRightpxToppxBottompx

Kindle’s system layout includes 2-4 px of margin. On a jailbroken device, KOReader can provide a more immersive full-screen reading experience.

Compression quality

LosslessStandard (recommended)Light compressionExtreme compression

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What it does

Compared with KCC and KOReader, Ereadertoolbar can detect and automatically crop different margins on manga covers and interior pages for the best full-screen reading experience.
Do not change resolution: crops only and keeps the cropped size as the output size
Handles CBZ / CBR / EPUB / ZIP archives in batch, or multiple image files
Packages everything into a single ZIP you can download on any device

Popular Kindle, Kobo, and iPad presets are available.

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If this tool helped, buy me a coffee and help keep development going 🙏