File Tools
51 toolsConvert, compress and manage files of all types.
File utilities for everyday workflows — convert between CSV, JSON, XLSX, and TSV; view large CSVs without choking your spreadsheet app; split or merge text files; generate sample data; and inspect file metadata. Each tool runs locally so even sensitive datasets never get uploaded. Perfect for analysts cleaning a CSV before import, devs prepping fixtures, or anyone who needs to convert a one-off file without launching Excel or writing a script.
Which file tools tool should I pick?
- Open a 100MB CSVStreams rows so it stays responsive on huge files.
- Convert a CSV to JSON for an APIOne-click conversion with header detection.
- Generate test data for a databasePick columns, types, and row count.
- Move data between Excel and a toolPreserves headers and number formats.
Frequently asked questions
Are these file tools really free?
Yes — every file tool on iwanttools is 100% free with no signup, no trials, and no usage limits. We don't charge for any feature.
Do these file tools work offline or in private?
Every tool runs entirely in your browser using JavaScript. Once the page loads, your input never leaves your device — no server upload, no tracking, no logging.
Which file tool should I use for converting CSV to JSON?
Use the comparison table above to pick the right tool for your scenario. The "Best tools for…" section also groups tools by common goals so you can jump straight to what fits.
Do I need to install anything?
No installation, no extension, no account. Open the tool page, use it, and close the tab — that's the entire workflow.
Can I use these tools on mobile?
Yes, every tool is mobile-optimized with large tap targets, a 16px input minimum to prevent iOS zoom, and a layout that adapts to phone screens.