Crypto Portfolio & Tax Analyzer
Upload a CSV of your trades to compute realized gains, cost basis and holdings — in your browser, nothing uploaded.
🔒 100% in your browser — nothing is uploaded
Expected columns: date, type (buy/sell), asset, quantity, price (extra columns are ignored). Everything is computed in your browser — nothing is uploaded.
How it works
Upload or paste a CSV of your buys and sells and get your realized gains (FIFO cost basis), total invested, and current holdings with their cost basis per asset. Your file is parsed and analysed entirely in your browser — it is never uploaded. Expected columns: date, type (buy/sell), asset, quantity and price.
This is an estimate for your own records using FIFO accounting, not tax advice. Rules vary by country (FIFO/LIFO/HIFO, holding periods); consult a tax professional.
Frequently asked questions
What CSV format do I need?
Columns for date, type (buy/sell), asset, quantity and price — common header names (side, symbol, qty, amount, total…) are recognised automatically. Rows it cannot read are skipped.
How are gains calculated?
Using FIFO (first-in, first-out): each sale is matched against your oldest remaining buys to work out the cost basis and the realized gain or loss.
Is my data uploaded anywhere?
No. The CSV is read and analysed entirely in your browser; nothing is sent to any server.