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# CBR to CBZ Converter
A command-line tool to convert `.cbr` (Comic Book RAR) files to `.cbz` (Comic Book ZIP) files with maximum compression.
## Features
- **Batch Processing** - Processes a batch of files in a directory automatically
- **Maximum Compression** - Uses the max compression rate for zips automatically
- **Progress Tracking** - Shows conversion progress and file size comparisons
- **Smart Skipping** - Avoids overwriting existing CBZ files
- **Optional Cleanup** - Prompts to delete original CBR files after conversion
## Download
Download the latest release for Windows from the [Releases](https://github.com/driftywinds/cbr2cbz/releases) page.
## Quick Start
### Windows
1. Download `cbr2cbz.exe` from [Releases](https://github.com/driftywinds/cbr2cbz/releases)
2. Place it in the folder containing your `.cbr` files
3. Double-click `cbr2cbz.exe` or run it from Command Prompt
4. Follow the prompts
### Linux/macOS
1. Compile the binary for your platform
2. Make it executable:
```chmod +x cbr2cbz-linux # or cbr2cbz-macos```
3. Place it in the folder with your `.cbr` files
4. Run it:
```./cbr2cbz-linux # or ./cbr2cbz-macos```
## Usage
Simply place the executable in a directory containing `.cbr` files and run it:
```bash
cbr2cbz.exe # Windows
./cbr2cbz # Linux/macOS
```
The tool will:
1. Scan the current directory for all `.cbr` files
2. Convert each file to `.cbz` format with maximum compression
3. Display progress and file size comparisons
4. Provide a summary of successful/failed conversions
5. Ask if you want to delete the original `.cbr` files
### Example Output
```
CBR to CBZ Converter
============================================================
Found 3 CBR file(s) to convert
============================================================
Processing: Amazing Spider-Man 001.cbr
→ Extracting...
→ Creating CBZ with 24 files...
✓ Created: Amazing Spider-Man 001.cbz
Original: 45.32 MB
New: 42.18 MB
Change: -6.9%
Processing: Batman 001.cbr
→ Extracting...
→ Creating CBZ with 28 files...
✓ Created: Batman 001.cbz
Original: 52.14 MB
New: 48.92 MB
Change: -6.2%
============================================================
Conversion Summary:
✓ Successful: 2
⚠ Skipped: 0
✗ Failed: 0
Total: 2
============================================================
Delete original .cbr files? (yes/no):
```
## Building from Source
### Prerequisites
- [Go 1.16 or later](https://go.dev/dl/)
### Build Instructions
1. Clone the repository:
```bash
git clone https://github.com/driftywinds/cbr2cbz.git
cd cbr2cbz
```
2. Initialize Go module and install dependencies:
```bash
go mod init cbr2cbz
go get github.com/nwaples/rardecode
```
3. Build for your platform:
**Windows:**
```bash
go build -ldflags="-s -w" -o cbr2cbz.exe main.go
```
**Linux:**
```bash
go build -ldflags="-s -w" -o cbr2cbz-linux main.go
```
**macOS:**
```bash
go build -ldflags="-s -w" -o cbr2cbz-macos main.go
```
4. **Cross-compile** for other platforms:
```bash
# Windows from Linux/Mac
GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -o cbr2cbz.exe main.go
# Linux from Windows/Mac
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o cbr2cbz-linux main.go
# macOS from Windows/Linux
GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w" -o cbr2cbz-macos main.go
```
The `-ldflags="-s -w"` flags reduce the executable size by stripping debug information.
## FAQ
**Q: What's the difference between CBR and CBZ?**
A: CBR files use RAR compression, while CBZ files use ZIP compression. CBZ files are more widely supported and don't require proprietary software to open.
**Q: Will this damage my original files?**
A: No. The tool only deletes original files if you explicitly choose "yes" when prompted. Until then, both CBR and CBZ files coexist.
**Q: Does this work with password-protected CBR files?**
A: No, password-protected RAR files are not supported.
**Q: Why is the CBZ file sometimes larger than the CBR?**
A: RAR typically achieves better compression than ZIP. However, CBZ files offer better compatibility and are easier to work with.
**Q: Can I convert CBZ back to CBR?**
A: This tool only converts CBR → CBZ. For the reverse, you'd need a different tool.
## Dependencies
The project uses the following Go library:
- [nwaples/rardecode](https://github.com/nwaples/rardecode) - RAR archive reading
---
Made with ❤️ for comic book enthusiasts