Carbone
Template-based document generation engine that renders DOCX, XLSX, ODP, and PDF files by merging JSON data into Office document templates using a simple mustache-like syntax, available as a self-hosted library or cloud API.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
API key per account. Document templates may contain sensitive data — secure template storage. Self-hostable (MIT licensed) for full data control. Generated documents should be secured.
⚡ Reliability
Best When
Your documents start as Word/Excel templates created by designers or business users, and you need to merge data into them programmatically — especially common for contracts, invoices, and reports.
Avoid When
Your document structure is highly dynamic and can't be expressed as a template, or your source is HTML rather than Office documents.
Use Cases
- • Generating PDF reports by merging data into Word document templates designed by non-developers
- • Contract and agreement generation from dynamic data merged into standard templates
- • Invoice and financial document generation maintaining exact branding from Office templates
- • Batch document generation — processing hundreds of documents with different data in parallel
- • Multilingual document generation from same template with different locale data
Not For
- • Pixel-perfect HTML-to-PDF conversion (use DocRaptor or Browserless for HTML sources)
- • Complex dynamic layouts where structure changes based on data (templates are fixed structure)
- • Real-time document generation with sub-500ms latency (rendering takes time)
- • Applications without ability to create/manage Office document templates
Interface
Authentication
API key in Authorization header for Carbone Cloud. Self-hosted version has no auth by default — implement your own. Free OSS version for self-hosting.
Pricing
Self-hosted OSS version is fully free with no render limits (hardware cost only). Cloud API is affordable for moderate volumes. Enterprise adds SLA and premium support.
Agent Metadata
Known Gotchas
- ⚠ Templates must be pre-uploaded before rendering — two-step process (upload template, then render)
- ⚠ Template syntax uses {d.fieldName} not {{fieldName}} — common confusion from mustache users
- ⚠ Office template design requires LibreOffice-compatible files — Google Docs exports may have compatibility issues
- ⚠ Conditional blocks and loops work but syntax is specific — read docs carefully before template design
- ⚠ Self-hosted version requires LibreOffice installed for DOCX→PDF conversion — adds system dependency
- ⚠ Template IDs change on re-upload — agents storing template IDs must handle template versioning
- ⚠ Cloud API render results are temporary — agents must download and store generated documents promptly
Alternatives
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Scores are editorial opinions as of 2026-03-06.