Guide
SVG vs PNG Export for Technical Diagrams
SVG is usually best for scalable documentation; PNG is useful for fixed-image destinations that cannot safely embed SVG.
This technical source review checks guide claims against current standards, official documentation, and the behavior of DevPouch tools. It is not an independent security audit.
Related tools
Practical recommendation
Use SVG when the destination supports sanitized vector images and readers may zoom. Text and edges remain sharp at different sizes.
Use PNG for systems that strip SVG, email clients, fixed presentation slides, or review processes that require inert raster output. Export at sufficient resolution and keep the Mermaid source as the editable artifact.
Working example
Documentation site: sanitized SVG
Issue attachment: PNG plus Mermaid source
Repository source: .mmd or fenced Mermaid block
Accessibility: adjacent text description in every caseReview checklist
- The destination permits the chosen MIME type.
- SVG contains no scripts, event attributes, foreign objects, or external references.
- PNG remains legible at its displayed size.
- Source and a text description are retained.
Compatibility, security, and limitations
- SVG can contain active or external content if not sanitized.
- PNG loses selectable text and becomes blurry when enlarged.
- Neither format creates an accessible description automatically.
Match the artifact to its destination
SVG retains vectors and usually selectable text, so it stays sharp during zoom and fits documentation sites well when sanitized SVG is permitted. PNG is a fixed grid of pixels and works in destinations that strip SVG or require inert image attachments. Export enough resolution for the intended display size.
Keep the `.mmd` source whichever image format is chosen. The source is the maintainable artifact, while SVG and PNG are delivery formats. Add a text alternative beside the image because neither format automatically explains a complex workflow to a screen-reader user.
Security and quality checks
- SVG root parses and contains no script, event attributes, foreign objects, or external references.
- PNG has nonzero dimensions and remains legible at normal display scale.
- Light and dark destinations preserve contrast.
- Text is not clipped after font substitution.
- The exported diagram matches the current editor source and theme.
References
FAQ
How should I verify the examples in SVG vs PNG Export for Technical Diagrams?
Load the synthetic example into the linked DevPouch tool, confirm the visible result, then verify syntax and behavior in the exact platform that will consume it.
Can the generated result replace technical review?
No. Rendering and validation catch mechanical issues; meaning, accessibility, security, and contract accuracy still require human review.