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ETag Conditional Header Builder
Build a hash-derived ETag or inspect a finite If-None-Match value.
Pasted text or header value, One binary file for build mode
etag.txt, conditional-headers.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- In Build mode enter text or select one binary file; the file wins exactly, including zero bytes. In Parse mode enter a bare ETag list or wildcard; Build fields do not affect the parsed result.
- Build or inspect entity tags and inspect the complete result.
- Download etag.txt, conditional-headers.json.
Examples
A literal backslash inside a quoted tag stays a backslash; it does not escape a closing quote.
Limitations
- Build accepts up to 1 MiB of text or 16 MiB of binary file bytes. Parse accepts up to 100 ASCII tags.
- This is an illustrative local hash tag or supplied header value. No server validator, request or cache status is observed.
- File bytes include any BOM. Parse uses the disclosed ASCII ETag subset and rejects injection controls or malformed lists.
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