Use complete source data
Work from original exports and contemporaneous records. Do not enter guessed values as if they were verified.
Private browser tool
Free Crypto Transaction CSV Checker
Review the structure of an exchange, wallet, or tax-software export before importing it elsewhere.
Maximum 15 MB. Common comma, semicolon, and tab-separated files are supported.
Choose a file and start the check.
Practical guidance
How to use the CSV checker
Choose an original exchange or wallet export, run the local check, and review missing values and possible duplicates before importing the file elsewhere. Keep the untouched original as evidence; repair a copy rather than overwriting it.
Review the result
Check dates, currency, quantities, fees, and assumptions before using an output in tax software or a filing.
Retain your evidence
Save original statements and notes that allow you or an adviser to reproduce the result.
Frequently asked question
Does this validate tax treatment?
No. It checks structure and completeness signals, not whether a transaction was classified or taxed correctly.
Is information uploaded?
No. This tool runs locally in your browser. Analytics records page usage, not the financial values you enter.