1099bconverter
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Form 8949 tools, free and without a sign-up

Both run in your browser. Neither asks for a file, an email, or an account.

Form 8949 code lookup

Pick any column (f) adjustment code — W, B, T, N, H, D, Q and the rest — and get the IRS wording, the situation that triggers it, and a worked example with the column (g) math.

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1099-B CSV validator

Paste a 1099-B or Form 8949 CSV and see what would break the import before your tax software tells you: missing headers, reversed dates, absent cost basis, wash-sale rows with no code W, gain that does not match proceeds minus basis.

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Have the PDF rather than a spreadsheet? Convert your 1099-B — free preview, $8.99 to download.