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Category Document Converters

Drag & Drop CBZ Archives

or click to browse local files

🔒 Client-Side Secure

Conversion Settings

Customize your output

Output Format

Page Layout

Manga Mode (RTL) Reverses page order for Japanese reading style

Optimize Size Apply JPEG compression to reduce PDF size

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About

This utility represents a paradigm shift in comic book archiving: Client-Side Processing. Unlike traditional converters that require uploading massive archives to a remote server - exposing your data and consuming bandwidth - this tool executes the decompression and PDF generation entirely within your browser's secure sandbox using WebAssembly-powered libraries. This approach guarantees zero latency for uploads and absolute privacy.

We solve the specific engineering challenges of comic conversion. Standard operating system sorting often mangles page orders (e.g., placing 10.jpg before 2.jpg). Our engine employs a Natural Sort Algorithm to recognize numerical sequences within filenames. Furthermore, we address the "Manga Problem" with a dedicated RTL (Right-to-Left) Mode, essential for Japanese media, which reverses the page sequence to align with the intended reading direction. The tool also parses standard ComicInfo.xml metadata schemas to preserve title and author information.

Formulas

To generate a standardized PDF page from varying image resolutions (common in scanned comics), we calculate a uniform scaling vector. Let v_img be the source image dimensions wh and v_pdf be the target page dimensions (e.g., A4).

The aspect ratio φ is preserved by selecting the limiting dimension:

φ = minw_pdfw_imgh_pdfh_img

The final projection onto the PDF canvas aligns the image to the center, calculating margins δ:

δ_x = w_pdf − (w_img × φ)2

Reference Data

Format Specification	Underlying Architecture	Compression Method	Metadata Standard	Typical Use Case	Kindle Support
.cbz	ZIP Archive	Deflate / Store	ComicInfo.xml	Standard Digital Comics	No (Requires Conversion)
.cbr	RAR Archive	RAR4 / RAR5	Rarely Standardized	Legacy Archives	No
.pdf	Portable Document Format	FlateDecode (Lossless) / DCT (JPEG)	XMP / Info Dict	Universal Compatibility	Native Support
.epub	OCF (ZIP Container)	Deflate	OPF (Open Packaging Format)	Books & Reflowable Text	Native (Recent Models)
.cb7	7-Zip Archive	LZMA / LZMA2	ComicInfo.xml	High Compression Archiving	No
.mobi	PalmDatabase	Huffman / PalmDOC	EXTH Header	Legacy Kindle	Native (Old Models)
.avif	HEIF Container	AV1 Codec	Exif / XMP	Next-Gen Image Storage	Limited
.webp	RIFF Container	VP8 / VP8L	XMP / Exif	Web Optimized Comics	Limited

Frequently Asked Questions

This is a classic "Lexicographical Sort" issue where computers sort strings character by character. Our tool uses a "Natural Sort" algorithm by default, which treats sequences of digits as single numbers. However, if the files inside the ZIP are named randomly (e.g., "scan_a.jpg", 'img_z.jpg'), the software cannot guess the correct order. We recommend renaming files to "001.jpg", "002.jpg" before archiving.

Yes. The converter respects the original resolution of the images. For double-page spreads (often found in landscape mode), the "Fit to Page" algorithm will scale the wide image to fit the width of the PDF page, effectively rotating it to landscape or shrinking it to fit portrait, depending on your selected settings.

There is no hard-coded software limit. The only constraint is your device's available Random Access Memory (RAM). Since we process files locally to ensure privacy, a 500MB CBZ file requires roughly 1-2GB of free RAM to decompress and convert efficiently. We recommend processing extremely large collections in batches of 3-5 files.

The extractor filters content based on MIME types and extensions. It specifically looks for .jpg, .jpeg, .png, .webp, and .gif files. System files like "thumbs.db" or "__MACOSX" folders are automatically ignored to keep the output PDF clean.

Traditional online converters upload your file to a cloud server, process it there, and send it back. This creates a risk for copyrighted material or personal data. This tool runs the logic in your browser's JavaScript engine. The file data never leaves your computer; it is read into memory, processed, and saved back to your disk immediately.

Yes, modern mobile browsers support the necessary File APIs. However, mobile devices often have stricter memory limits. Converting a 300-page graphic novel on an older phone might cause the browser tab to crash due to memory exhaustion. Use "Low" compression settings for better performance on mobile.