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CSV Encoding and BOM Inspector
Inspect a local CSV file's byte-order mark, supported decoding and table structure.
Local CSV file, Decoding policy
csv-encoding-inspector.json (complete 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
- Enter values using the examples, or choose a local file where requested. Follow the displayed supported input shapes and limits.
- Choose Calculate result and inspect the complete result.
- Download result to save the primary file. Where supplied, additional links save source files and the full JSON report. Reset restores examples and clears output.
Examples
Local CSV file: Choose a local CSV file
Decoding policy: auto
Limitations
- One actual local file up to400000 bytes. Detect UTF8/UTF16 BOMs,refuse unsupported UTF32 decoding,and validate auto/explicit UTF8/UTF16LE/BE policy. No silent fallback on invalid bytes or conflicting BOM. BOM-less UTF8 is compatible,not uniquely identified. Strip exactly one initial BOM for CSV framing; decodedCharacters counts UTF16 units excluding that marker. CSV inspection uses up to2000 records/200 columns/100000 cells; exceeding that inspection budget reports unknown CSV validity. No filename/content upload; malformed data gives diagnostics and missing/oversize files refuse.
- Text fields are limited to100,000 UTF16 units each and400,000 combined UTF8 bytes; file fields have their own displayed limits. Combined output is at most4MiB. Processing stops after30 seconds; tool-specific bounds may be tighter.
- Generated source is a downloadable result and is not executed here. Inspection does not establish remote behavior, trust or standards certification.
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