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Convert TSV to JSON

Paste your TSV and this tool converts it to JSON instantly, right in your browser. TSV separates columns with tabs, so it pastes straight into a spreadsheet and survives commas in the data. JSON (JavaScript Object Notation) is the lingua franca of web APIs: compact, strictly typed, and supported everywhere.

The conversion is completely client-side: there's no upload, no queue, and no account. Big files are converted in the background with a Cancel button, the options for the lossy steps are one click away, and your last conversion is remembered.

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TSV to JSON Converter — frequently asked questions

How do I convert TSV to JSON?
Paste your TSV, or open or drop a file, and the JSON appears instantly. Copy it, download it (named after your file), or open it in another tool. Errors point to the line and column. Everything happens in your browser.
Does it use the first row as headers, and keep my zip codes?
Yes. The first row is the column names. Each column gets one type: numbers only when every value is a plain number, so zip codes and ids like 01234 stay text with their leading zeros. Tick "Keep values as text" to read everything as text. A file with one column works, and short rows are padded and listed by line number.
Is my data uploaded to a server?
No. The conversion runs entirely in your browser — your data never leaves your device, so it's safe to convert configuration, API payloads, and other sensitive files. You can even go offline once the page has loaded.
Is this converter really free?
Yes. No sign-up, no payment details, no file-size paywall, and no watermark on the output.

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