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LD Local Data Tools

The complete workbench ยท 4 tools

Browser data tools

A focused set of private browser utilities for formatting JSON, converting CSV, testing JavaScript regex, and encoding or decoding Base64.

No login. No server upload. Open files are read by browser code on this device and are not sent to an application backend.

Choose a workflow

Data utilities with real controls

How tools earn a place
BE Local tool

Base64 Encoder & Decoder

Encode or decode UTF-8 text and files with standard or URL-safe Base64, optional padding, previews, copy, and downloads entirely in your browser.

Updated 2026-08-03
Ct Local tool

CSV to JSON Converter

Convert CSV, TSV, semicolon, or pipe data to JSON with header controls, type inference, null handling, table preview, import, copy, and download.

Updated 2026-08-03
JR Local tool

JavaScript Regex Tester

Test JavaScript regular expressions with live match highlighting, flags, capture groups, indexes, replacement preview, presets, and copyable results.

Updated 2026-08-03
JF Local tool

JSON Formatter & Validator

Format, validate, minify, sort, search, and explore JSON in a collapsible tree. Import, copy, or download without uploading your data.

Updated 2026-08-03