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Make a CBR From Any PDF — No Desktop App Required

Some comic readers — Chunky on iPad, older Kobo and Pocketbook e-readers, certain YACReader profiles — list nothing in their library unless the file ends in .cbr. Open this page, drag your PDF in, and a properly-named CBR lands in your downloads in seconds. Single file or batches of up to 20. Everything happens inside the browser tab; the source PDF never goes near a server.

Drag & drop files here

Or click to browse (max 20 files, up to 100 MB each)

File upload

Optimised for CBR-only readers like Chunky and older Kobo devices · Runs entirely in your browser · 100% free

Why convert to CBR?

The Extension Strict Readers Demand

Chunky on iPad, the comics app on older Kobo and Pocketbook devices, certain YACReader profiles, ComicRack on Windows tablets — they all filter their library by file extension and silently skip anything that isn't .cbr. This converter writes the precise extension those readers watch for, so the file lights up in the library list the moment it lands.

Filename-Sorted, Not Metadata-Sorted

Legacy comic readers were designed around RAR archives where filename order was the whole index — there's no separate manifest to guess from. Pages here are named 0001.jpg through 0237.jpg with leading zeros, so an alphabetical sort matches reading order exactly, even on a Kobo that doesn't try to be clever about it.

Tuned for E-Ink or Retina

E-ink devices (Kobo Libra, Pocketbook InkPad) render JPEG at default quality just as well as PNG, and the slimmer file lets a 32 GB device hold ten more volumes. On a retina tablet where compression artefacts show up at zoom, switch to PNG — the trade-off is sharper line art for noticeably larger files.

Migrate a Whole Reader Library

Switching from a mixed library to a CBR-only device, or unifying a collection so every file shares one extension? Drop up to 20 PDFs at once. The output is 20 .cbr files with identical encoding, ready to sideload over USB to an e-reader or push to a watch folder.

Live Page Counter

A long collected edition might run 300 pages — at that scale you want to know whether you have time for a coffee or whether it's about to finish. The counter ticks page-by-page so you can glance over and read the live state instead of staring at an indeterminate bar.

Browser Sandbox, Not a Server

There is no upload, no temporary folder living on someone else's disk, no retention policy to take on trust. The entire conversion is JavaScript inside your browser tab. Close the tab and the input PDF, the intermediate JPEGs and the finished CBR all evict from memory simultaneously.

Why pick CBR over CBZ?

Functionally, CBR and CBZ both wrap a sequence of images in an archive — but the .cbr extension is what unlocks reading on the comic apps and devices that don't auto-detect content type. iPad apps like Chunky, older Kobo and Pocketbook e-readers, and some YACReader profiles whitelist the .cbr extension and silently ignore .cbz files. If that's the constraint forcing you here, you're in the right place. If your reader is happy with either, the universally-compatible CBZ format is a slightly safer default.

Use the PDF to CBZ converter instead

Sometimes You Just Need a CBR

When Chunky Refuses to See the File

There's a manga volume you've been meaning to read for weeks. Someone digitized it years ago and posted the PDF — clean pages, careful numbering, table of contents intact. The trouble starts when you open Chunky on the iPad: the library picker shows everything in the comics folder except the file you actually want. PDFs are invisible. So are .cbz files. Chunky filters strictly by .cbr extension and ignores the rest.

Most of the advice online points you at a desktop converter, or a Calibre plugin, or a paid one-trick app on the App Store. None of that helps when you're on the couch, with the tablet in your hand and twenty minutes before bed.

So you open Safari on the iPad instead, navigate here, attach the PDF straight from Files, tap Convert. Twenty seconds later, a CBR with the original filename drops back into Files. Share-sheet it into Chunky and the cover appears in the library immediately. Page-turn gestures work, zoom snaps to panel, the bookmarking finally remembers where you left off.

The three other volumes you've been sitting on? You queue them on the laptop next morning and AirDrop the lot over before lunch.

Sideloading a Pocketbook From a Pile of PDFs

The Pocketbook InkPad is the device you actually carry on commutes — long battery, easy on the eyes, no notifications. It reads CBR happily. It reads PDFs technically, but the bookmarking forgets where you were between sessions and the page-fitting at zoom is awkward enough to make the read unpleasant. So the policy on this device is plain: comics live as .cbr or they don't live at all.

Half a year of indie-publisher purchases has stacked up on the desktop, all in PDF. Fifteen of them, untouched. A previous Saturday-morning attempt at migration ended badly: one desktop converter crashed on the third file, another popped a license dialog, a third produced files that the Pocketbook displayed as broken.

This time you drag the whole folder onto the page in one go, flip greyscale on (the bulk of the collection is monochrome anyway), and step away to put the kettle on. By the time the tea has cooled, a single zip is in your downloads with fifteen properly-named CBR files. Plug the Pocketbook in, copy them across, eject — every cover thumbnail renders cleanly the next time the device wakes.

The Kobo Forma at Tonight's Discussion

The graphic novel group meets at seven, and the host is the one with the e-reader plugged into the projector — an older Kobo Forma that handles .cbr and politely refuses .cbz or PDF. You volunteered to walk through the courtroom sequence, pages 12 through 28, the section everyone disagreed about last meeting. The source is a PDF on your laptop.

You open this page, upload the PDF, set the page range to Custom 12–28, click Convert. The 17-page CBR is ready before you've finished pouring coffee, named after the chapter, exactly the slice that was needed and nothing more. You message the host, AirDrop it over, and the file is on the Forma before you leave the kitchen.

By eight, the Forma is rendering every panel in order, your annotations line up with everyone else's, and the conversation runs a step deeper than usual — because for once, nobody is squinting at the wrong format on the wrong device.

1

Attach the source PDF(s)

One file for a live page-by-page preview and per-file settings, or up to 20 queued together for a uniform sideload batch. Each PDF is parsed the moment you release it — there is no upload progress bar, no server-side queue, no waiting room to sit through.

2

Choose the encoding

Leaving the defaults (JPEG quality 85, full page span, full colour) produces a small, clean CBR that looks correct on tablets and e-ink alike. Push to PNG when you're archiving a one-of-a-kind scan; narrow the page range to clip a chapter in single-file mode; flip greyscale on to shave 30–40% off the file size for a monochrome series.

3

Sideload to the reader that wants it

The CBR lands in your downloads folder the moment the last page is encoded. Plug a Kobo or Pocketbook in over USB and copy across, AirDrop into Chunky on iPad, hand to YACReader's watch folder, or let Calibre catalog it — any reader that recognises the .cbr extension takes it from there with no further conversion.

  • Every page is extracted locally — no server ever touches your comic.
  • Your PDF and the resulting CBR stay inside your browser tab.
  • No login, no email — paste a PDF in, get a CBR out.