Developer Tools
Extract CSS Custom Media
Extract @custom-media names and conditions from pasted CSS for breakpoint-token audits without rendering, fetching, or uploading code.
0 / 30,000 characters. No upload, storage, or account required.
CSS custom-media extraction workflows
Use this extractor when pasted styles need a browser-local inventory of named media-query tokens before breakpoint documentation or migration.
Audit modern CSS
Pair this with Extract CSS Selectors, Extract CSS Supports Rules, and CSS Formatter.
Review architecture patterns
Use Extract CSS Nesting Selectors, Extract CSS Scope Rules, and Extract CSS Custom Media together.
Clean copied output
Send extracted rows to Remove Duplicate Lines, Sort Lines, or Normalize Whitespace.
What this tool does
Extract CSS Custom Media scans pasted CSS as text, lists @custom-media definitions with source lines, removes duplicate rows, and runs locally in your browser.
Common use cases
Extract CSS @custom-media names and media conditions from pasted stylesheets, design-token files, framework output, or copied source before breakpoint audits, migration, QA, or documentation handoffs.
Use Extract CSS Custom Media when you are working with copied API payloads, logs, encoded values, config snippets, identifiers, or debugging data and need a quick browser-local check before pasting the result into docs, tickets, tests, or another developer tool.
How to use it
- Paste stylesheets, component CSS, framework output, design-token files, or copied source.
- Choose whether duplicate rows should be removed and whether output should be normalized for comparison.
- Review extracted rows with source lines, then copy the clean list for CSS architecture, migration, QA, or documentation audits.
Example workflow
Copy a small payload or encoded value from an API response, request URL, log line, or config file. Run the focused check here, confirm the output is readable, then continue with related developer data tools such as validation, formatting, decoding, timestamp conversion, or CSV/JSON conversion.
Privacy note
Extract CSS Custom Media runs locally in your browser. Your pasted CSS is not uploaded, rendered, fetched, crawled, executed, stored, or logged.
FAQ
Does Extract CSS Custom Media resolve media queries?
No. It scans pasted CSS as text and does not evaluate breakpoints, render pages, execute code, fetch assets, upload, store, or log snippets.
Which custom media definitions are included?
It finds @custom-media definitions such as --tablet: (width >= 48rem) and --desktop: (width >= 64rem).
When is this useful?
Use it while auditing breakpoint tokens, custom media naming, responsive CSS migrations, or design-system documentation.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.