What is a CBR file, and why does everything want a PDF?
The CBR to PDF converter turns a CBR or CBZ comic into a PDF, one page image per PDF page, in reading order. It runs in the browser tab you already have open. The comic is never uploaded, and there's no account.
CBR and CBZ
A CBR isn't really a comic format. It's a RAR archive with the extension changed from .rar to .cbr. Inside is a folder of page images, usually JPEGs named 001.jpg, 002.jpg and so on, sometimes with a ComicInfo.xml holding the series and issue number. A CBZ is the same idea built on ZIP. The new extension exists for one reason: it tells a comic reader app to show the images as a book instead of as a folder. That trick works in comic readers and almost nowhere else. Your phone's file app, your e-reader, your print shop and the PDF viewer on your work laptop all look at a .cbr and shrug.
PDF is the format every device already opens. A PDF can hold a JPEG exactly as it is, with no re-compression, so a scanned comic page fits inside one without losing anything. It also keeps pages in a fixed order and at a fixed shape, which is what a comic needs. Turning a CBR into a PDF doesn't change the art. It changes the box the art comes in.
How CBR to PDF conversion works
Five steps, all of them on your own machine.
- Read the first bytes, not the name. A RAR starts with
Rar!; a ZIP starts withPK. The tool checks those bytes to decide what the file really is. Plenty of files named .cbr are ZIPs inside, and a converter that trusts the extension rejects them. Here they open, and a note says "This .cbr is really a ZIP inside. That's common, and it converted fine." - Unpack in memory. RAR4 and RAR5 archives go through a WebAssembly build of the RAR decoder that downloads with the page. ZIPs are read directly.
- Keep only the pages. JPG, PNG, GIF, WebP, BMP and AVIF files are pages.
ComicInfo.xml, scanner notes and text files are left out and listed. Mac and Windows clutter (__MACOSX,._page01.jpg,.DS_Store,Thumbs.db) is dropped without comment, because nobody needs to hear about it. - Sort the way people count.
page2comes beforepage10, and every page inChapter 2comes beforeChapter 10. The next section shows why this matters. - Write the PDF. JPEG pages go in byte for byte. PNG pages are stored losslessly. WebP, GIF, BMP and AVIF pages are decoded by your browser and saved as high-quality JPEGs (quality 0.92, on a white background).
PDF page size = image pixels × 0.75 points — that's 96 pixels per inch, the same scale your screen uses. A 1988 × 3056 pixel scan becomes a 1491 × 2292 point page, or about 20.7 × 31.8 inches. PDF readers zoom it to fit the screen, so the big number doesn't matter. The shape does.
The download is named after the comic, so Saga 001.cbr comes back as Saga 001.pdf. The PDF's title field is set to the same name.
The usual shape of converting a comic to PDF online looks different. You upload a 60 MB file to a stranger's server, wait in a queue, hit a size ceiling, and get offered a monthly plan to lift it. None of that is a technical requirement. A browser can unpack an archive and write a PDF by itself. The upload is the product, and the limits exist to be sold back to you.
Why page10 lands before page2 in most converters
Computers sort text one character at a time. The character 1 comes before 2, so page10.jpg sorts before page2.jpg. In a comic with unpadded page numbers, that drops pages 10 through 19 in right after page 1, and the story stops making sense on the third page. Here's the same six files sorted both ways:
| PDF page | Plain text order (wrong) | Natural order (what this tool does) |
|---|---|---|
| 1 | page1.jpg | page1.jpg |
| 2 | page10.jpg | page2.jpg |
| 3 | page11.jpg | page3.jpg |
| 4 | page2.jpg | page9.jpg |
| 5 | page3.jpg | page10.jpg |
| 6 | page9.jpg | page11.jpg |
Folders get the same treatment. A collected edition with Chapter 1/, Chapter 2/ and Chapter 10/ comes out in that order, with each chapter's pages sorted inside it. Plain text sorting would put all of Chapter 10 between Chapters 1 and 2. Capital letters don't matter either: Page_02.JPG sorts right after page_1.jpg.
How big each page comes out
Every page takes the shape of its own image, so a double-page spread stays twice as wide as the pages around it instead of being squashed into a portrait frame.
| Page image (pixels) | PDF page (points) | Printed size (inches) | Typical source |
|---|---|---|---|
| 800 × 1200 | 600 × 900 | 8.3 × 12.5 | Older web scan |
| 1200 × 1800 | 900 × 1350 | 12.5 × 18.75 | Mid-quality scan |
| 1988 × 3056 | 1491 × 2292 | 20.7 × 31.8 | High-quality single page |
| 3976 × 3056 | 2982 × 2292 | 41.4 × 31.8 | Double-page spread |
| 30000 × 2000 | 14400 × 960 | 200 × 13.3 | Long webtoon-style strip, shrunk to fit |
That last row is the one ceiling you might hit. PDF pages can't be longer than 14,400 points (200 inches) on a side, so anything bigger is scaled down as a whole, keeping its shape. Every PDF reader can open the result.
When you'll need to convert a comic to PDF
Most people searching for CBR to PDF have one of four reasons.
An e-reader or tablet that doesn't read CBR. Many e-readers and the default book apps on phones open PDF and ignore comic archives. Convert once and the comic shows up in the library next to everything else.
Printing. A CBR to PDF conversion is usually the first step before printing. Print shops and home printers take a PDF, not a RAR. Because each page keeps its shape, the printer's "fit to page" setting does the right thing on every sheet.
Sharing with someone who doesn't read comics digitally. Sending a .cbr to a friend means also sending instructions. A PDF just opens.
Archiving your own work. Artists and small presses often keep issues as folders of page scans. Zip the folder, rename it to .cbz, convert it, and you have one PDF that works the same for a freelancer building a portfolio, a student turning in a sequential art project, or someone at a big company making a zine on the side.
Edge cases and gotchas
Locked CBZ files can't be read here. A password-locked CBR works: a password box appears, and the password never leaves your browser. A password-locked CBZ does not, because the ZIP reader this tool uses can't decrypt. You'll see a message saying the file may be damaged or locked. Remove the password in a desktop archiver first, then convert.
CB7 and CBT aren't supported. Those are 7-Zip and TAR versions of the same idea, and they're rare. The tool recognizes them from their bytes and tells you to re-save as CBZ in a comic manager, instead of failing with a vague error.
Split archives need every piece. A comic cut into .part1.rar and .part2.rar is one stream in two files. Neither half can be read alone. Join them with a desktop tool, then convert.
TIFF and HEIC pages are left out. Only JPG, PNG, GIF, WebP, BMP and AVIF count as pages. A TIFF page shows up in the "left out" note, so it never vanishes silently. If you see one listed, convert those images first and repack.
Some pages may be re-encoded. JPEG and PNG pages are untouched. A WebP or AVIF page becomes a JPEG at quality 0.92, which is visually close but not identical. Transparent areas turn white, which is what paper looks like anyway.
Big comics need memory. The archive, its unpacked pages and the finished PDF all sit in one tab at once. The ceiling is 512 MB per comic, 5,000 files inside it, and 1 GB of unpacked pages. An omnibus past that is better split into volumes. A phone will reach its limit sooner than a laptop.
Related PDF and archive tools
If you only need the pages out of a .cbr rather than a PDF, the RAR to ZIP converter repacks it as a ZIP your computer opens with a double-click. For a stack of loose page scans that were never in an archive, image to PDF builds the same kind of file from individual images. And if your WebP pages keep coming out as JPEGs anyway, WebP to JPG lets you convert them yourself first.
Once you have the PDF, the rest of the PDF shelf applies. Join a run of issues into one volume with the PDF merger, pull a single story out of an anthology with split PDF, fix a sideways spread with rotate PDF, or shrink a huge scan for email with compress PDF. Reading prose instead of panels? EPUB to PDF does the same job for ebooks. All of them run on your device, same as CBR to PDF.
Frequently asked questions
Can the CBR to PDF converter do several comics at once?
One at a time. Drop a comic, download its PDF, press Convert another. If you want a whole run as a single file, convert each issue and then join them with the PDF merger, which lets you set the order yourself.
Will my comic reader's series and issue info carry over?
No. That information lives in ComicInfo.xml, which isn't a page, so it's left out, and the note under the file name says so. The PDF's title is set from the file name instead, so name the comic well before converting and the PDF inherits it.
Can I turn the PDF back into a CBZ?
Not on this page. PDF to JPG renders each page back out as an image, which you can zip and rename to .cbz. That's a re-render, not a copy, so keep the original archive if you care about exact quality.
Does it work on a phone?
Yes, in mobile browsers on Android and iOS. The PDF saves to your downloads and opens in the built-in viewer. A single issue is fine. A 400 MB collected edition on an older phone may run out of memory, so convert big ones on a laptop.
The pages came out wrong. What should I try first?
Check the names inside the archive. If pages are called things like scan_a.jpg and scan_b.jpg with no numbers, there's no order to recover, and the tool sorts them alphabetically. If one page is missing, look at the notes: a damaged or unsupported image is listed by name, so you know which one to replace. And if the whole file won't open, ask whoever sent it for a fresh copy. That fixes it more often than any converter will.
What does it cost, and where's the catch?
Nothing, with no account, no email field and no upload. There's no locked "pro" version with a higher size limit — this is the full tool. Microapp is funded by memberships, and 10% of every dollar it earns goes to charity, off the top, audited quarterly.