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Toolshed

CSV to JSON

Convert CSV to JSON, including large files.

  • No uploads
  • No limits
  • No signup
Input:
CSV
Output:
JSON
Runs on:
Your device
Size limit:
None
Account:
Not needed

How to use CSV to JSON

  1. Add your CSV

    Paste CSV text or upload a file. Files over 1 MB are converted in the background so the page stays smooth.

  2. Choose the options

    Pick the delimiter (or auto-detect), say whether the first row is a header, and optionally turn numbers and booleans into real JSON values.

  3. Copy or download

    Preview the first 100 lines, then copy the JSON or download it as a .json file.

Why CSV to JSON on Toolshed

  • No uploads

    Everything runs in this browser tab. Your files never leave your device.

  • No limits

    No file-size caps, no daily quotas. Process as much as your device can handle.

  • No signup

    No account, no email, no watermark.

Frequently asked questions

How does it know my delimiter?

Auto-detect checks for commas, semicolons, tabs and pipes. If the result looks wrong, choose the delimiter yourself.

Can I convert big CSV files?

Yes. Files over 1 MB are parsed in a background worker. Everything stays on your device, and the preview shows the first 100 lines while copy and download include the whole result.

Are my files uploaded anywhere?

No. CSV to JSON runs entirely in your browser. Your files are processed on your device and are never sent to a server.

Is there a file size limit?

No fixed limit. The only limit is your device's memory. Very large files work best in a desktop browser.

Is CSV to JSON really free?

Yes. There's no account and no watermark. A short optional ad, or a 20-second wait, unlocks each download. That's how we keep it free.

Does it work offline?

Once the page has loaded, processing happens locally, so it keeps working even if your connection drops.