Self-Hosted Comic Library & CBZ/CBT Reader

Gopherbook is a lightweight, single-binary, self-hosted web comic reader and library manager written in Go.
It is designed for people who want full control over their digital comic collection (CBZ/CBT files), including support for password-protected/encrypted archives, per-user libraries, tagging, automatic organization, and a clean modern reader.

License

Features

• Upload & read .cbz (ZIP-based) or .cbt (TAR-based) comics directly in the browser
• Watch folder support for bulk imports – drop CBZ/CBT files into your watch folder and they're automatically imported
• Supports 8 Megapixel images at 512MB memory limits
  • (increase in bash script for higher Megapixels or remove the limitation if you don't care)
• Full support for password-protected/encrypted CBZ files (AES-256 via yeka/zip) or CBT files (AES-256-CFB Openssl)
• Automatically tries all previously successful passwords when opening a new encrypted comic
• Persists discovered passwords securely (AES-encrypted on disk, key derived from your login password)
• Extracts ComicInfo.xml metadata (title, series, number, writer, inker, tags, story arc, etc.)
• Automatic folder organization: Library/Artist/StoryArc/Comic.cbz
• Manual reorganization via UI if needed
• Powerful tagging system with custom colors and counts
• Filter comics by any combination of tags
• Responsive grid view with cached JPEG covers
• Full-screen web reader with:
  • Page pre-loading
  • Zoom / pan
  • Fit-to-width/height/page
  • Keyboard navigation (←→, A/D, +/-, Esc)
• Multi-user support:
  • Each user has their own completely isolated library and password vault
  • First registered user becomes admin
  • Admin can disable new registrations
  • Admin can delete any comic
• No external database – everything stored in simple JSON files
• Single static Go binary + file storage – easy to deploy

Installation / Running

Prerequisites

• Go 1.25.2+ (only needed to build)
• Or just download a pre-built binary from Releases (when available)

Quick start (from source)

git clone https://codeberg.org/riomoo/gopherbook.git
cd gopherbook
go build -o gopherbook app/gopherbook/main.go
./gopherbook

Then open http://localhost:8080 in your browser.

If you want to use this with podman:

git clone https://codeberg.org/riomoo/gopherbook.git
cd gopherbook
./scripts-bash/run-gb-container/run-podman.sh

or

If you want to use this with docker:

git clone https://codeberg.org/riomoo/gopherbook.git
cd gopherbook
./scripts-bash/run-gb-container/run-docker.sh

Then open http://localhost:12010 in your browser.

First launch

1. On first run there are no users → registration is open
2. Create the first account → this user automatically becomes admin
3. Log in → start uploading CBZ/CBT files

Directory layout after first login

./library/username/                ← your comics (organized or Unorganized/)
./library/username/comics.json     ← metadata index
./library/username/tags.json       ← tag definitions & counts
./library/username/passwords.json  ← encrypted password vault (AES)
./cache/covers/username/           ← generated cover thumbnails
./watch/username/                  ← watch folder for bulk imports (auto-scanned)
./etc/users.json                   ← user accounts (bcrypt hashes)
./etc/admin.json                   ← admin settings (registration toggle)

Environment Variables

Can be used to set where everything is stored with:

GOPHERBOOK_LIBRARY=$HOME/.config/gopherbook/library
GOPHERBOOK_CACHE=$HOME/.config/gopherbook/covers
GOPHERBOOK_ETC=$HOME/.config/gopherbook/etc
GOPHERBOOK_WATCH=$HOME/.config/gopherbook/watch

Watch folder for bulk imports

Gopherbook includes an automatic watch folder system that makes bulk importing comics effortless:

• Per-user watch folders: Each user gets their own watch folder at ./watch/[username]/
• Automatic scanning: The system checks for new CBZ/CBT files every 10 seconds
• Smart debouncing: Waits 5 seconds after detecting files to ensure they're fully copied
• File validation: Checks that files aren't still being written before importing
• Duplicate handling: Automatically renames files if they already exist (adds _1, _2, etc.)
• Zero configuration: Just drop CBZ/CBT files into your watch folder and they appear in your library

How to use

1. After logging in, your personal watch folder is at ./watch/[yourusername]/
2. Copy or move CBZ/CBT files into this folder using any method:
   • Direct file copy/paste
   • SCP/SFTP upload
   • Network share mount
   • Automated scripts
3. Within ~15 seconds, files are automatically imported to your library
4. Files are moved (not copied) to preserve disk space
5. Check the API endpoint /api/watch-folder to see pending files

Example workflow:

# Bulk copy comics to your watch folder
cp ~/Downloads/*.cbz ./watch/myusername/
cp ~/Downloads/*.cbt ./watch/myusername/

# Wait ~15 seconds, then check your library in the web UI
# All comics will be imported and organized automatically

How encrypted/password-protected comics work

• When you upload or scan an encrypted CBZ/CBT that has no known password yet, the server marks it as Encrypted = true.
• The first time you open it in the reader, a password prompt appears.
• If the password is correct, Gopherbook:
  • Stores the password (encrypted with a key derived from your login password)
  • Extracts ComicInfo.xml metadata
  • Auto-organizes the file into Artist/StoryArc folders
  • Updates tags and cover cache
• From then on the comic opens instantly, and that password is automatically tried on every future encrypted comic you upload (so whole collections that share one password "just work").

Security notes

• Passwords are stored encrypted on disk using AES-256-CFB with a key derived from your login password via SHA-256.
• Session cookie is HttpOnly, expires after 24 h.
• No external dependencies that phone home.
• Still: treat this as a personal/private server – do not expose it publicly without HTTPS/reverse-proxy auth.

Config for NGINX to use as a website:

upstream gopherbook {
        server 127.0.0.1:8080;
        #server 127.0.0.1:12010; #For Podman instead
        server [::1]:8080;
        #server [::1]:12010; #For Podman instead
}
server {
        listen 80;
        listen [::1]:80;
        server_name gopherbook.example.com;
        location / {
                proxy_pass http://gopherbook;
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-Forwarded-Proto $scheme;
                # 1. Allow very large uploads (e.g. 500 MB – adjust as needed)
                client_max_body_size 500M;          # 0 = unlimited, but never do that on a public server

                # 2. Give the upload enough time (important for slow connections)
                client_body_timeout 5m;             # time to read the entire request body (default 60s)
                proxy_read_timeout 5m;              # if you're proxying to your Go app
                proxy_send_timeout 5m;

                # 3. Increase buffer sizes so Nginx doesn't spill everything to disk
                client_body_buffer_size 512k;       # default 8k/16k – too small for big uploads
                proxy_buffers 8 512k;
                proxy_buffer_size 256k;

                # 4. Recommended: put uploads in a temporary directory with plenty of space
                client_body_temp_path /var/lib/nginx/body 1 2;   # make sure this directory exists and is writable by nginx
        }
}

Contributing

Pull requests are welcome! Especially:

• Better mobile reader experience
• Bulk tag editing
• Search box
• OPDS catalog endpoint
• More metadata sources (ComicVine, etc.)

Please open an issue first for bigger changes.

If you'd like to know about the new mascot Vinny

• Check the Wiki!
• GitHub: https://github.com/riomoo/gopherbook/wiki/Meet-Vinny
• GitGud: https://gitgud.io/riomoo/gopherbook/-/wikis/Meet-Vinny
• JesterDesigns: https://git.jester-designs.com/riomoo/gopherbook/wiki/Meet-Vinny

Thanks / Credits

• yeka/zip – password-protected ZIP support in pure Go
• The ComicRack ComicInfo.xml standard
• Everyone who hoards comics ❤️

Enjoy your library!
– Happy reading with Gopherbook

Software Used but not included

Creator:

• Codeberg Riomoo
• GitGud Riomoo
• Github Riomoo