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IEEE 754 Float Inspector
Inspect binary32/binary64 words, exact finite rationals, byte orders, NaN payloads and explicit decimal conversion effects.
Strict decimal token, 8 or 16 hex digit raw word
JSON IEEE field report
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
- Choose Format and Input mode. Raw bit word expects8 or 16 MSB-first hexadecimal digits, with optional0x.
- Decimal mode first parses JavaScript Number(binary64), then stores it in the selected DataView format. It is not direct arbitrary-decimal-to-binary32 rounding.
- Select Inspect floating-point fields and download ieee754-inspection.json. Read conversion flags for overflow/underflow.
Examples
Raw binary32 3f800000 has sign 0, exponent 127, fraction 0 and exact rational 1/1. Raw NaN payload bits remain unchanged.
Limitations
- At most300 UTF-16 input units, decimal exponent magnitude10,000,4/8 raw bytes,64 KiB JSON and 30 seconds.
- Decimal NaN/Infinity names, hexadecimal decimal-mode tokens, separators and trailing junk are rejected. Conversion overflow/underflow is reported rather than hidden.
- Raw NaN payload/sign inspection does not classify quiet/signaling or certify application floating-point behavior. Byte-order arrays do not reinterpret the canonical raw word.
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