Files & Data tools — Free Online Files & Data Tools
Clean, convert, profile and reshape CSV and JSON files — drag a file in, get the result back, all 100% in your browser. No upload, no signup, no row limit beyond your device's memory.
Drag a CSV or JSON file in and get a cleaned, converted, profiled or reshaped file back — every byte stays on your device. We use Papaparse plus a small set of pure-JS helpers, so even multi-million-row files process in seconds without the file ever touching our server.
Compare Files & Data tools — Free Online Files & Data Tools
| Tool | Input | Output | Max size | Runs in browser? |
|---|
| CSV File Cleaner | Any file | Hash, preview or data | 100 MB | Yes |
| CSV Delimiter Converter | Any file | Hash, preview or data | 100 MB | Yes |
| CSV File to JSON Converter | Any file | Hash, preview or data | 100 MB | Yes |
| JSON File to CSV Converter | Any file | Hash, preview or data | 100 MB | Yes |
| Remove Duplicate Rows from CSV | Any file | Hash, preview or data | 100 MB | Yes |
| CSV Column Extractor | Any file | Hash, preview or data | 100 MB | Yes |
| CSV Column Renamer / Mapper | Any file | Hash, preview or data | 100 MB | Yes |
| CSV Date Format Converter | Any file | Hash, preview or data | 100 MB | Yes |
| CSV Find & Replace | Any file | Hash, preview or data | 100 MB | Yes |
| CSV Data Profiler | Any file | Hash, preview or data | 100 MB | Yes |
| Excel to CSV Converter | Any file | Hash, preview or data | 100 MB | Yes |
| CSV to Excel Converter | Any file | Hash, preview or data | 100 MB | Yes |
Frequently asked questions
- Are these CSV and JSON tools really free with no upload?
- Yes. Every Files & Data tool here is free, with no signup, watermark, or row limit. Files are parsed and rewritten 100% in your browser using Papaparse and the Web File API — nothing is uploaded.
- What file size can these tools handle?
- There is no fixed cap. Files of a few hundred MB and several million rows usually work on a modern laptop. The practical limit is the memory available to your browser tab; the browser will warn you long before anything bad happens.
- Which delimiters are supported?
- Comma, semicolon, tab and pipe are auto-detected on import; you can override the choice in any tool. The delimiter converter writes back to whichever delimiter you select.
- Will my CSV's quoting and escaping be preserved?
- Yes. The parser is RFC-4180 compliant: quoted fields, embedded commas, embedded newlines and `""` escaped quotes round-trip exactly. Output is re-quoted only where required by the spec.
- Do these tools work offline?
- Yes — once the page has loaded, every Files & Data tool works fully offline. Add the page to your home screen on iPhone, Android or desktop for one-tap access.