Analyse a workbook and report what a conversion would do — never writes documents, never exposes cell contents. ``` rendlio diagnose [options] ``` ## Arguments | Argument | Value | Required | Meaning | |---|---|---|---| | `` | `FILE` | yes | Path to a `.xlsx` / `.xlsm` file, or `-` for stdin. | ## Options | Option | Value | Default | Env var | Milestone | Meaning | |---|---|---|---|---|---| | `--report` | `PATH\|-` | — | — | M1 | Writes the [compatibility report](/docs/compat-report) JSON (`-` = stderr summary only). Without it, diagnose prints the human summary and writes no file. | | `--culture` | `BCP-47` | `en-US` | `RENDLIO_CULTURE` | M1 | Locale for separators and month names when a number format lacks an explicit `[$-LCID]`. | ## Examples Print the human summary; write nothing. ```bash rendlio diagnose book.xlsx ``` Diagnose-mode reports additionally record `rendered` entries, so you see everything detected, not only the deviations. They are [safe to share](/docs/compat-report#diagnose-mode--privacy) — static text plus counts and locations, never cell contents. ```bash rendlio diagnose book.xlsx --report diagnose.json ``` ## See also - [Global options](/docs/cli#global-options) and [environment variables](/docs/cli#environment-variables) — they apply here too - [Exit codes](/docs/cli#exit-codes) — what `rendlio diagnose` returns and what it promises