Split a large CBZ into parts
An omnibus or a long scanned volume can be too big for the way you want to move it. Send to Kindle takes 50 MB per email and 200 MB per web upload, by Amazon's own figures, and a volume at scan resolution beats the first of those routinely even after conversion. Compressing harder is one answer and it costs image quality. Splitting is the other, and it costs nothing but having more than one file.
↑ Upload and configure in our Studio
This page presets a 50 MB cap, the email ceiling. Drop a volume in and if the converted file would exceed it, the book comes back as numbered parts, part 1, part 2 and so on, each under the cap and each carrying your title, series, volume and cover so they sit together in the library in order rather than as anonymous files. One conversion, one download allowance, however many parts it takes.
- Files auto-delete after 24 hours
- No install, runs in any browser
- Free to use
- The genuine open-source KCC engine
How to split an oversized volume
Drop the volume in
CBZ, CBR, CB7, CBT, ZIP, RAR, 7Z, PDF or EPUB. Up to 1GB per file, which is the point here: this page is for the big ones.
A 50 MB cap is already set
That is the Send to Kindle email limit. Change it if you are aiming at something else, or clear it if you would rather have one large file after all.
Convert
If the result fits the cap you get one file. If it does not, you get numbered parts, each under the cap, with the same metadata and cover on every one.
Take the parts
Download each part, or fetch them on the device from your Reader Shelf, where each part is its own row. Files auto-delete after 24 hours.
Why 50 MB and not 200
Amazon allows 50 MB per Send to Kindle email and 200 MB per web upload. The email route is the one people use and the one that bounces, so that is the cap this page presets. If 200 MB is your target, the compress page is set up for it.
Every part is a complete book entry
The title, series, volume number, author and your chosen cover are written into each part, not just the first. A part with KCC defaults and a first-page cover sitting beside a properly tagged part 1 reads as a mistake, so the metadata and cover passes run per part.
Frequently asked questions
Where does the split fall?
On a page boundary, chosen so each part lands under the size cap you set. We will be straight about the limit: the split is driven by size, not by chapters, so a part boundary is not guaranteed to coincide with a chapter start. A chapter-aware splitter is a separate planned feature.
Do the parts read as one book on the device?
They sit next to each other in order, as part 1, part 2 and so on under the same series and title, with the same cover. No e-reader merges separate files, so they stay separate library entries, correctly sorted.
Is splitting better than compressing?
For quality, yes. Compressing to hit a size target re-encodes the pages, which eventually makes screentone muddy and line art soft. Splitting leaves every page at the quality it converted at and only changes how many files you end up with. The two can be combined if a volume is both long and heavy.
Does a split cost more than a normal conversion?
No. A split happens because of a size cap, not because you asked for several books, so taking three parts of one volume counts the same as taking one file.
Can I split without converting to another format?
Yes. This page is preset to repack as CBZ, so the output is the same kind of file you put in, just in parts sized to your cap. Switch the output to EPUB or a device profile if you want it converted at the same time.
Conversion and splitting run on Kindle Comic Converter (KCC), the open-source engine comic readers have trusted for years, hosted here with a live preview so there is nothing to install.
Free, no install, a 50 MB cap is preset for Send to Kindle