Is CloudConvert the Best PDF to CBZ Tool? Two Alternatives

You have a stack of comics or scanned manga saved as PDF, and your reader — Calibre, YACReader, Foliate, Panels on an iPad — would rather have CBZ. The conversion itself is simple: a CBZ is just a ZIP full of page images. The real question is which PDF to CBZ tool to use, because they differ a lot on file limits, privacy, and how much they make you fuss with settings. This article compares three popular options — CloudConvert, Converter.app, and MyTools — and tells you which one suits which job.

What a PDF to CBZ Converter Actually Does

A CBZ file ("Comic Book ZIP") is a plain ZIP archive containing one image per page, named in reading order. Comic readers open it and show proper page navigation, double-page spreads, and zoom — things PDFs handle awkwardly inside most reader apps.

Converting from PDF means rasterising each page to an image (JPEG or PNG), numbering them, and zipping them up. The differences between tools come down to a few practical things:

• Where the work happens — on your machine, or uploaded to a company's servers.
• How much you can convert for free before hitting a cap or a paywall.
• How much control you get — image quality, page range, greyscale, batch.

People reach for an online tool here because the desktop route (Calibre's command line, ImageMagick scripts) is overkill for a one-off, and installing software on a work laptop is often not an option.

CloudConvert

CloudConvert is the heavyweight general-purpose converter — over 200 formats, a documented API, and integrations with Google Drive and Zapier. PDF to CBZ is one small entry in a very long list, and it's built for people who convert all kinds of files, not comics specifically.

What it gets right

• Enormous format coverage and a genuinely reliable engine — if a conversion can be done, CloudConvert usually does it cleanly.
• Handles large files well because the work runs on their servers, not your browser, so a 500 MB graphic-novel scan won't choke your laptop.
• Conversion options are exposed (resolution, page range on many formats) and it slots into automated workflows via the API.

Where it falls short

• Your PDF is uploaded to CloudConvert's servers. That's fine for a public comic, less ideal for anything personal, and it means waiting through an upload.
• The free tier is metered — roughly 25 conversion minutes a day without an account, after which you're into a credit or subscription model. (The exact free allowance has shifted over time, so check before a big batch.)
• It's a Swiss-army knife, not a comic tool: no CBZ-specific niceties, and a long page run can eat your daily free minutes quickly.

Converter.app

Converter.app is a lighter, focused converter with a dedicated PDF-to-CBZ page. It's free, requires no obvious signup, and converts automatically the moment you drop a file in.

What it gets right

• Purpose-built page for this exact conversion — no menu-diving to find CBZ.
• Free to use, and it accepts a batch of up to 20 files at once.
• Dead-simple flow: upload, wait a few seconds, download.

Where it falls short

• Files are uploaded to a server to be processed; I couldn't confirm any local-processing or detailed retention policy, so treat it as a normal cloud upload.
• The output controls are minimal — I didn't find exposed settings for JPEG quality, lossless PNG, greyscale, or a custom page range, so you largely take what it gives you.
• Limits (max file size, how long files are kept) aren't clearly published, which makes it hard to plan a large archival job around it.

MyTools

MyTools runs the entire conversion as JavaScript inside your browser tab — the PDF never leaves your machine. It's free, needs no account, and is built specifically around the CBZ use case.

What it gets right

• Nothing is uploaded. There's no server log of your PDF because there's no server in the loop — useful for personal scans or DRM-free purchases.
• Real CBZ controls: JPEG (quality 85 by default) for small-and-sharp reading, or lossless PNG for archiving, plus a greyscale toggle for monochrome series and a custom page range to package a single chapter.
• Library-friendly output: pages are zero-padded (0001.jpg, 0042.jpg) so they sort correctly and drop straight into a Calibre watched folder, with a live page counter instead of a mystery spinner. Batch up to 20 PDFs in one go.

Where it falls short

• Because it runs in your browser, there's a 100 MB cap per input PDF, and very large 20-file batches can strain memory on an older phone — a server tool like CloudConvert has more headroom for huge files.
• The custom page-range option is single-file only; batch mode always converts every page.
• It's a converter, not an archivist's toolkit — it won't embed ComicInfo.xml series/author metadata or manage your library, so heavy collectors still lean on Calibre for tagging.

At a Glance

	CloudConvert	Converter.app	MyTools
Free tier	Metered (~25 min/day)	Free	Free, unlimited
Signup required	No (for the free quota)	No	No
Files uploaded to server	Yes	Yes	No — runs in your browser
Output controls	Some	Minimal	JPEG/PNG, greyscale, range
Batch support	Yes	Up to 20	Up to 20
Best for	Big files & automation	Quick one-off	Private, configurable CBZ

Which One Should You Pick?

If you're converting genuinely huge files, or you want PDF to CBZ as one step in an automated pipeline alongside fifty other formats, CloudConvert is the right tool — its server-side engine and API are built for exactly that, and the free daily minutes cover the occasional comic.

If you just need one PDF turned into a CBZ in the next thirty seconds and don't care about settings, Converter.app does it with zero fuss.

If your files are personal, or you want to dial in JPEG vs lossless PNG, greyscale, or a single chapter — and you'd rather your comics never touch a stranger's server — MyTools is the best fit. It keeps the whole thing local while still giving you the controls a comic reader actually wants. If your reader specifically needs the older .cbr extension instead, the companion PDF to CBR converter does the same job for that format.

The Bottom Line

All three will get a PDF into a CBZ. CloudConvert wins on scale and integrations, Converter.app wins on sheer simplicity, and MyTools wins when privacy and output control matter — without an upload, an account, or a daily cap.

Want to keep your comics off other people's servers? Try the MyTools PDF to CBZ converter for free →