totonoeAI
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totonoeai

AI tools that tidy up your documents

Free Tools

  • PDF Converter
  • Word/Excel → Markdown
  • Image → Text (OCR)
  • Markdown Editor
  • Diagram Builder
  • Screenshots → PDF
  • PDF Editor
  • Image Editor
  • Data Converter
  • SQL Formatter
  • URL Shortener

AI Tools

  • AI Document Formatter
  • AI Meeting Notes
  • AI Table Extraction
  • AI Diagram Builder
  • Video & Audio Processor

Other

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  • Commercial Disclosure

© 2026 totonoeai

Data Converter

Convert and format JSON / CSV / Excel data. Toggle the table editor to edit cells and add or delete rows / columns directly in the browser — your data stays on your device.

Input format

Drag & drop a file

orclick to select

Accepted: .json, .csv, .tsv, .txt, .xlsx / up to 200MB

1
Output format

Data Converter — JSON / CSV / Excel Interconversion + In-Browser Table Editing

Convert between JSON, CSV, and Excel directly in your browser. The optional table editor lets you add/remove columns and edit cells live, then export in any format.

Conversion matrix

**Input**: JSON (object array), CSV (any delimiter), Excel (.xlsx, .xls).

**Output**: Pretty JSON, CSV (UTF-8 / UTF-8 BOM), Excel (.xlsx).

All 6 directions work. Excel uses ExcelJS (the CVE-affected `xlsx` library is not used).

Table editing mode

A react-data-grid table appears after conversion. Click cells to edit; column headers expose add/remove/reorder. Re-export to get the modified data — no need to open Excel for small tweaks.

Privacy: fully in-browser

JSON.parse, PapaParse, and ExcelJS all run client-side. Data never leaves your machine — safe for customer lists or internal aggregations.

Offline-capable once loaded.

Frequently Asked Questions

What's the size limit?

Bound by browser memory; ~10 MB / tens of thousands of rows works smoothly. Larger may slow the table editor.

Multiple Excel sheets supported?

Currently only the first sheet is read/written. Split the workbook before uploading if you need multi-sheet support.

Character encoding?

UTF-8 by default. CSV output offers a UTF-8-with-BOM mode so Excel opens it without garbled characters.

Can nested JSON be tabled?

We assume a flat object array. Nested objects are flattened with dot notation (e.g. `user.name`).

Related Tools

SQL Formatter →

Pair with SQL output formatting.

Markdown Editor →

Render converted data as Markdown tables.

PDF Converter →

Pull tables out of PDFs first.