Convert YML to FB2

Drag and drop files here or click to select.
Max file size 100mb.

Uploading progress:

YML vs FB2 Format Comparison

Aspect	YML (Source Format)	FB2 (Target Format)
Format Overview	YML YAML Short Extension Short file extension variant for YAML (YAML Ain't Markup Language), widely used in Docker Compose, CI/CD pipelines, and framework configuration files. Uses indentation-based structure with minimal punctuation for key-value pairs, lists, and nested mappings. Follows the YAML 1.2 specification and is a strict superset of JSON. Data Format DevOps Standard	FB2 FictionBook 2.0 XML-based e-book format designed for fiction and non-fiction publications. Created in Russia and widely popular across Russia and Eastern Europe. FB2 stores the entire book structure, metadata, and content in a single XML file with optional Base64-encoded images. Known for clean semantic structure and comprehensive bibliographic metadata support. E-book Format XML-Based
Technical Specifications	Standard: YAML 1.2 Encoding: UTF-8 Format: Indentation-based, minimal punctuation Data Types: Strings, numbers, booleans, null, sequences, mappings Extension: .yml	Standard: FictionBook 2.0 (XML Schema) Encoding: UTF-8 (XML content) Format: Single XML file with XSD schema Features: Sections, metadata, footnotes, embedded images Extension: .fb2
Syntax Examples	YML uses indentation for structure: name: My Project version: "2.0" services: web: image: nginx ports: - "80:80" features: - logging - cache	FB2 uses XML structure for content: <FictionBook> <body> <section> <title><p>My Project</p></title> <p>Version: 2.0</p> <section> <title><p>Services</p></title> <p>Web: nginx</p> </section> </section> </body> </FictionBook>
Content Support	Key-value mappings Nested mappings Sequences (lists) Multi-line strings (literal and folded) Comments (# inline and block) Anchors and aliases (& and *) Multiple documents (--- separator)	Hierarchical sections with titles Paragraphs with emphasis (bold, italic) Footnotes and endnotes Base64-encoded embedded images Book metadata (author, genre, date, ISBN) Table of contents auto-generation Epigraphs, poems, and citations
Advantages	Human-readable with clean syntax Minimal punctuation overhead Native comments support Multi-line string handling JSON superset (YAML 1.2) DevOps industry standard	Single XML file (easy to store and transfer) Rich bibliographic metadata Clean semantic document structure Self-contained with embedded images Widely supported in Russian-language e-readers Easy format conversion to EPUB/MOBI
Disadvantages	Indentation-sensitive (whitespace errors break parsing) Implicit type coercion (e.g., "NO" becomes boolean false) Security risks with yaml.load() (arbitrary code execution) Complex specification with many edge cases Slower parsing compared to JSON	Limited adoption outside Russia/Eastern Europe No CSS styling (rendering depends on reader) Limited table and layout support Large files when images are Base64-encoded No multimedia support (audio/video)
Common Uses	Docker Compose (docker-compose.yml) CI/CD pipelines (.travis.yml, .gitlab-ci.yml) Rails database configuration (database.yml) Ansible playbooks and inventories Helm charts for Kubernetes	Fiction and non-fiction e-books Russian-language digital libraries (Flibusta, Lib.rus.ec) E-book distribution in CIS countries Archival book storage in structured XML E-book conversion source format
Best For	Docker and container configurations CI/CD pipeline definitions Framework configuration files DevOps automation workflows	Russian-language e-book readers Structured book archival E-book format conversion pipelines PocketBook and other CIS e-readers
Version History	Created: 2001 by Clark Evans YAML 1.0: 2004 (first formal spec) YAML 1.1: 2005 (widely implemented) YAML 1.2: 2009 (JSON superset, current) .yml: Common shorthand extension	FB2 1.0: Early 2000s (initial development) FB2 2.0: 2004 (current widely used version) FB3: Proposed successor (ZIP-based, limited adoption) Status: Active in Russia/Eastern Europe
Software Support	Python: PyYAML, ruamel.yaml JavaScript: js-yaml Ruby: Psych (built-in) Go: gopkg.in/yaml.v3	Readers: FBReader, CoolReader, PocketBook, AlReader Editors: FB Editor, OPC, Sigil (with plugins) Converters: Calibre, fb2converter, Pandoc Libraries: fb2 (Python), lxml for XML processing

Why Convert YML to FB2?

Converting YML files to FB2 format produces structured XML-based e-books from your DevOps configuration data. FB2 (FictionBook 2.0) is the dominant e-book format in Russia and Eastern Europe, supported by popular readers like FBReader, CoolReader, and PocketBook devices. This conversion is valuable for technical teams in these regions who need configuration documentation in their preferred e-book format.

The FB2 format excels at storing structured, text-heavy content with rich metadata. When converting YML configurations, the hierarchical nature of both formats aligns well: YML nested mappings map naturally to FB2 nested sections, sequences become structured paragraphs, and the complete document receives proper bibliographic metadata including title, author, and generation date.

Our converter parses the YML structure and generates valid FB2 XML: top-level keys become titled sections, nested mappings create sub-sections with their own titles, sequences render as formatted paragraphs or lists, and key-value pairs appear as clearly labeled content. The output includes proper FB2 description metadata and is compatible with all FB2 reading applications.

Key Benefits of Converting YML to FB2:

Regional Compatibility: Native format for Russian and Eastern European e-readers
Self-Contained: Single XML file with all content and metadata included
Rich Metadata: Proper book description, author, and genre information
Clean Structure: Hierarchical sections that mirror YML nesting
Easy Conversion: FB2 converts easily to EPUB, MOBI, and other formats via Calibre
Offline Reading: Read configuration documentation on any FB2-compatible device

Practical Examples

Example 1: Docker Compose Application Stack

Input YML file (docker-compose.yml):

version: "3.8"
services:
  web:
    image: nginx:latest
    ports:
      - "80:80"
  db:
    image: mysql:8
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: app

Output FB2 XML structure:

<body>
  <section>
    <title><p>Docker Compose Configuration</p></title>
    <p>Version: 3.8</p>
    <section>
      <title><p>Web Service</p></title>
      <p>Image: nginx:latest</p>
      <p>Ports: 80:80</p>
    </section>
    <section>
      <title><p>Database Service</p></title>
      <p>Image: mysql:8</p>
      <p>MYSQL_ROOT_PASSWORD: secret</p>
      <p>MYSQL_DATABASE: app</p>
    </section>
  </section>
</body>

Example 2: Ansible Playbook

Input YML file (playbook.yml):

- name: Configure Server
  hosts: production
  become: true
  vars:
    app_port: 8080
    app_env: production
  tasks:
    - name: Install packages
      apt:
        name: ""
      loop:
        - nginx
        - certbot

Output FB2 XML structure:

<body>
  <section>
    <title><p>Configure Server</p></title>
    <p>Hosts: production</p>
    <p>Become: true</p>
    <section>
      <title><p>Variables</p></title>
      <p>app_port: 8080</p>
      <p>app_env: production</p>
    </section>
    <section>
      <title><p>Tasks</p></title>
      <p><strong>Install packages</strong></p>
      <p>Module: apt</p>
      <p>Loop: nginx, certbot</p>
    </section>
  </section>
</body>

Example 3: Application Configuration

Input YML file (config.yml):

app:
  name: MyService
  version: "3.1.0"
  debug: false
database:
  host: db.example.com
  port: 5432
  name: myservice_prod
logging:
  level: warn
  output: /var/log/myservice.log

Output FB2 XML structure:

<body>
  <section>
    <title><p>Application Configuration</p></title>
    <section>
      <title><p>App</p></title>
      <p>Name: MyService</p>
      <p>Version: 3.1.0</p>
      <p>Debug: false</p>
    </section>
    <section>
      <title><p>Database</p></title>
      <p>Host: db.example.com</p>
      <p>Port: 5432</p>
      <p>Name: myservice_prod</p>
    </section>
    <section>
      <title><p>Logging</p></title>
      <p>Level: warn</p>
      <p>Output: /var/log/myservice.log</p>
    </section>
  </section>
</body>

Frequently Asked Questions (FAQ)

Q: What is YML format?

A: YML is the short file extension for YAML (YAML Ain't Markup Language), a human-readable data serialization standard following the YAML 1.2 specification. It is the dominant extension for Docker Compose files (docker-compose.yml), CI/CD configurations (.travis.yml, .gitlab-ci.yml), Rails configuration (database.yml), Ansible playbooks, and Helm charts. YML uses indentation-based structure with key-value pairs, sequences, and nested mappings.

Q: What is FB2 format?

A: FB2 (FictionBook 2.0) is an XML-based e-book format created in Russia and widely popular across Russia and Eastern Europe. It stores the complete book structure, metadata (author, title, genre, annotation), and content in a single XML file. Images can be embedded as Base64-encoded binary data. FB2 is supported by popular readers like FBReader, CoolReader, PocketBook, and AlReader.

Q: Why would I convert YML to FB2 instead of EPUB?

A: FB2 is the preferred format in Russia and Eastern European countries where PocketBook devices and FBReader are dominant. If your team or readers primarily use FB2-compatible applications, converting directly to FB2 avoids an extra conversion step. FB2 also offers richer bibliographic metadata than EPUB 2.

Q: How are YML nested structures mapped to FB2 sections?

A: The converter maps YML hierarchy to FB2 nested sections: top-level keys become main sections with titles, nested mappings create sub-sections, sequences are rendered as formatted paragraphs, and key-value pairs become labeled content paragraphs. The FB2 section nesting mirrors the YML indentation structure.

Q: Can I convert the FB2 output to other e-book formats?

A: Yes. FB2 is an excellent intermediate format for e-book conversion. Calibre can convert FB2 to EPUB, MOBI, AZW3, PDF, and many other formats. The structured XML nature of FB2 means conversions typically produce clean, well-formatted output in the target format.

Q: What happens to YAML anchors and aliases?

A: YAML anchors (&) and aliases (*) are fully resolved during parsing. The FB2 output contains the expanded data with all references resolved, so inherited configurations appear with their complete values in each section.

Q: What happens if my YML file has syntax errors?

A: If the YML file contains syntax errors such as incorrect indentation or invalid characters, the converter will treat the content as plain text and include it in a single FB2 section. You will still receive a valid FB2 file, though the structured section formatting will not be applied.

Q: Does the FB2 output include proper metadata?

A: Yes. The converter generates a complete FB2 description block including the document title (derived from the filename or top-level key), generation date, and source format information. You can edit this metadata in any FB2 editor after conversion.

Q: Is there a file size limit?

A: Our converter handles YML files of any reasonable size. Complex configurations with deeply nested structures, multiple services, and extensive key-value mappings are fully supported and produce well-organized FB2 documents with proper section hierarchy.