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Convert data files between the four formats every spreadsheet, database and API speaks: CSV, XLSX (Excel), JSON and TSV. CSV becomes a clean JSON array of records; JSON becomes a spreadsheet or CSV with one row per record; Excel files become CSV or JSON without opening Excel. The input format is detected from the file itself — the extension does not matter — and the first row is kept as the header everywhere.
Files arrive in whatever format the sender fancied; the Data Converter is part of a documents-forward bench on ConvertFiles built for that moment — Office and PDF both ways, with images, audio and video converted in the same visit, and everything deleted the moment you download.
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Tap to choose a file or drag & drop it here
CSV, XLSX, JSON or TSV files · deleted right after processing
A short ad is shown before processing — it keeps this tool free. No sign-up, no watermark.
Upload your file — drag & drop it or tap to browse.
Set any options, then hit the button.
Watch the short ad — your finished file downloads instantly.
Why people pick this over other converters
No account, ever. Most big converter sites push sign-ups and paid tiers for basic jobs. Here the tool just works.
No watermarks and no job counters on standard tools — fair-use rate limits keep things fast for everyone — and a generous 200 MB upload limit.
Private by design: your file is processed in a temporary folder and deleted the moment your download finishes. Nothing is stored or shared.
Fast: this page is a fraction of the size of the ad-heavy alternatives, and the same account-free toolbox has 406 other tools when you need them.
FAQ
My JSON will not convert — why?
For spreadsheet-shaped outputs (CSV, TSV, XLSX) the JSON must be a list of records: an array of objects. A single object or a nested document has no rows and columns to become — the tool will tell you exactly that, in plain language, rather than failing silently.
What shape of JSON works?
For CSV, TSV and Excel output the JSON must be a list of records — an array of objects, one object per row, like [{"name":"Ada","age":36}]. Nested values inside a record are kept as compact JSON text in their cell, so nothing is silently dropped.
Which row is the header?
The first row of a CSV/TSV file, and the first row of the spreadsheet’s active sheet, are treated as column names and preserved. Converting back keeps them, so CSV → JSON → CSV keeps your headers and values.
Is this really free?
Yes — completely. A short ad before processing keeps every tool free; no account, subscription or credits are ever required.
What happens to my file?
It is processed in a temporary folder and deleted the moment your download finishes. We never store, view or share uploads.
Do I need to install anything?
No. Everything runs in your browser session against our servers — any phone, tablet or computer works.
