Extract inline styles to a stylesheet
Pull every style="…" attribute out of an HTML snippet, dedupe identical declarations, generate stable class names and emit a clean stylesheet alongside the rewritten markup.
/* CSS */
.style-1 {
color: red;
padding: 8px;
}
.style-2 {
font-weight: bold;
}
.style-3 {
color: blue;
}
/* HTML */
<div class="style-1">A</div>
<div class="style-1">B</div>
<div class="style-2">C</div>
<p class="style-3">Different rule.</p>How extraction works
Every style attribute is hashed by exact text. Matching values share a single .style-N class so the output stylesheet is naturally deduplicated. Existing class attributes are preserved and the generated class appended.
- 01
Paste markup
Any HTML containing inline style attributes.
Parsing is strict-but-tolerant — comments and trailing commas are accepted on input where the source format historically permits them; output stays canonical.
inputstricttolerantliveparsein · sourcehtml · live<div style="color:red">A</div>
loaded · parsedtarget · ready - 02
Dedupe declarations
Identical style strings share one class name across all elements.
Conversion preserves type information where the target supports it (numbers stay numeric, booleans stay boolean) so the destination parser never has to re-coerce.
dedupetype-preservinglosslesslivememoiseduniq · optionsmatch · live.style-1 → applied 2×
options applied · liveround-trip - 03
Rewrite tags
The inline attribute is replaced; existing classes are preserved so component styles still apply.
Re-encoding is idempotent: running output back through the same converter produces the same bytes, which keeps round-trips git-friendly.
rewriteidempotentround-tripdiff-cleandeterministicmerge · convertedclass · readyclass="card style-1"
converted · livediff-clean - 04
Copy stylesheet
Output bundles the CSS rules above and the rewritten HTML below.
Copy writes via
navigator.clipboard.writeText; downloads use the target’s native MIME so editors apply the right syntax highlighting on open.exportclipboardtarget MIMEblobclient-side✓ · copiedready · done✓ Copied
shipped · ready to shipsuccess
Converting between formats, safely
Pick the strictest source format
Lossy formats hide bugs. Choose JSON or YAML as your source-of-truth, convert downstream as needed.
Round-trip in CI
If your converter is idempotent, your CI can verify A → B → A equals the original. Catches subtle data loss.
Numbers vs strings differ
YAML/TOML have a number type; CSV doesn’t. Quote IDs in CSV to keep leading-zero values intact.
Watch character encoding
Source format may be Latin-1 / Windows-1252; target should be UTF-8. Convert encoding before structure.
Preserve comments where you can
YAML and TOML support comments. Don’t silently drop them — they often encode intent.
Schema-aware beats blind
Use a schema to guide conversion. Field types, required-ness, and defaults survive better with structure.
When to extract styles
Refactoring, performance, design systems.
Email templates
Audit which inline styles repeat across an email. Type information survives: numbers stay numeric, booleans stay boolean, strings stay strings. The destination parser doesn't have to re-coerce, which avoids the "'true' becomes "true"" bug class.
round-trip safeCMS clean-up
Move WYSIWYG inline styles to a proper stylesheet. Run output back through the inverse converter to verify idempotent round-trips in CI. A → B → A should produce byte-identical input — if it doesn't, you've found data loss.
type-preservingPerformance
Shrink HTML payload by sharing reused styles via classes. Comments and metadata survive where the target format supports them (YAML, TOML, HCL). The tool doesn't silently drop intent-encoded annotations, which keeps your config self-documenting.
schema-awareDesign system audit
See which inline values escape the design system. Pair with a schema (JSON Schema, OpenAPI, Zod, Pydantic) to catch shape drift on either side. Catch breaking changes at conversion time rather than at runtime in production.
losslessLegacy migrations
Start moving inline-styled markup into a Tailwind or BEM stylesheet. Output respects target-format conventions: quoting in CSV, indent in YAML, brackets in JSON. Existing parsers don't need patches, and the result drops into legacy pipelines unchanged.
diff-cleanDocumentation
Show inline → external in a refactoring guide. Encoding-aware: handles UTF-8 vs UTF-16 vs Latin-1 / Windows-1252 transparently. The character-set surprise that breaks "works on my machine" doesn't apply here.
spec-gradeFrequently asked questions
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