BIMI SVG Validator

Simple browser tool to check whether an SVG is suitable for use with BIMI (Brand Indicators for Message Identification).

Validation runs entirely in the browser with JavaScript + libxml2 WebAssembly (xmllint-wasm), using the official SVG Tiny PS / BIMI RELAX NG schema (validate.rng). No Python, Pyodide, or server backend.

Run locally

Serve the folder over HTTP (ES modules and fetch need a real origin, not file://):

python3 -m http.server 8080
# or: npx serve .

Open http://localhost:8080/.

How it works

1. index.html — UI (upload file or paste SVG)
2. main.js — loads validate.rng, then validates with xmllint-wasm (extension: "relaxng")
3. vendor/xmllint-wasm/ — vendored xmllint-wasm 5.2.0 (~800 KB total, vs multi‑MB Pyodide previously); MIT license in vendor/xmllint-wasm/COPYING, pin/refresh notes in vendor/xmllint-wasm/VERSION
4. validate.rnc / validate.rng — schema source and XML form

Example SVGs

File	Expected result	Why
examples/valid-bimi.svg	Pass	version="1.2", baseProfile="tiny-ps", required <title>, viewBox (recommended for BIMI), only allowed shapes
examples/invalid-bimi.svg	Fail	<script>, external <image>, animation — not permitted in BIMI/SVG Tiny PS

Paste either into the tool (or upload the file) to verify the validator.

References

• SVG Tiny Portable/Secure (IETF draft)
• Using the RNC schema to validate BIMI SVG images
• xmllint-wasm