Convert between CSV, JSON, Excel, TSV, and YAML right in your browser — no signup, no upload, no watermark. Your files never leave your device.
🔒 100% private — conversion happens in your browser. Nothing is uploaded.
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Our free file converter turns one data format into another in seconds, right inside your browser. Whether you need to convert CSV to JSON, turn a messy export into a clean spreadsheet, or flatten a JSON file into rows for analysis, this tool handles the most common data interchange formats — CSV, TSV, JSON, YAML, and Excel — with no signup, no watermark, and no file size games. Drop a file or paste your data, pick an output format, and download the result.
Because every conversion runs locally on your own device using JavaScript, your data is never uploaded to a server. That matters when you are working with customer lists, analytics exports, ad-platform reports, or anything else you would rather not send to a stranger's cloud. For marketers, analysts, and developers who live in spreadsheet and API exports, a fast, private converter removes a daily point of friction.
To convert CSV to JSON, upload or paste your CSV, set "Convert from" to CSV (or leave it on auto-detect), choose JSON as the output, and click Convert. The tool reads the header row as keys and turns each remaining row into a JSON object, producing a clean array of records you can drop straight into an API request or a config file. Numbers and booleans are detected automatically so you do not end up with everything wrapped in quotes.
Going the other way — JSON to CSV — works the same way. Paste an array of flat objects, pick CSV as the output, and the converter writes a header row from the object keys and one CSV row per record. This is the fastest way to get JSON API data into a spreadsheet for sorting, filtering, or sharing with a non-technical teammate.
Spreadsheets are everywhere, but they are not always the format you need. To convert Excel to CSV, drop your .xlsx file onto the tool and choose CSV — the first worksheet is read and exported as comma-separated values, ready for import into databases, ad platforms, or any system that expects a plain CSV. To go from CSV to Excel, paste or upload your CSV and select Excel (.xlsx) as the output; the converter builds a proper workbook and downloads it, so your data opens cleanly in Excel, Google Sheets, or Numbers with the columns intact.
Developers and DevOps teams constantly move between JSON and YAML for configuration files. This tool converts either direction while preserving nested structure, so you can paste a JSON config and get readable YAML, or paste YAML and get strict JSON. It also handles TSV (tab-separated values) in both directions — useful when you are pulling data out of a tool that exports tabs instead of commas, or pasting straight from a spreadsheet cell range.
Most online converters upload your file to their servers, process it there, and send it back. That introduces three problems: privacy risk, file size limits, and waiting on someone else's queue. A browser-based converter sidesteps all of them. The conversion logic runs on your machine, which means there is nothing to upload, no size cap beyond your own device's memory, and instant results. It also works offline once the page has loaded.
For agencies and teams handling client data, the privacy angle is more than a nice-to-have. Exporting a customer email list from a CRM and running it through a random cloud converter can violate data-handling policies. Doing the same conversion locally keeps the data on the device the whole time, which is exactly how sensitive data should be treated.
Is this file converter free?
Yes — completely free, with no account, no watermark, and no limit on how many files you convert. Drop a file or paste your data and download the result.
Are my files uploaded anywhere?
No. Every conversion runs entirely in your browser using JavaScript. Your data never leaves your device and nothing is sent to a server, which makes this safe for sensitive exports like customer lists and analytics data.
Which formats can I convert between?
CSV, TSV, JSON, YAML, and Excel (.xlsx), in any direction. Common conversions include CSV to JSON, JSON to CSV, Excel to CSV, CSV to Excel, JSON to YAML, and YAML to JSON.
Why can't my nested JSON convert to CSV?
CSV, TSV, and Excel are flat, table-shaped formats. They need an array of simple rows (objects with key-value pairs). Deeply nested JSON has no single table shape, so convert nested data to JSON or YAML instead, or flatten it to a list of rows first.
Does it work on mobile?
Yes. It runs in any modern browser on any device — no extension or app to install.
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