Free Online Data Tools for Developers and Analysts
Clean, convert, validate, and transform JSON, CSV, SQL, and text instantly in your browser.
All tools run locally in your browser - no uploads, no accounts, and no data storage.
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Free browser-based tools for working with data
DataToolbox provides practical utilities for common data problems that come up in day-to-day engineering, analytics, and spreadsheet workflows. Instead of opening heavy desktop software or writing one-off scripts, you can format JSON, clean CSV exports, validate structured input, parse URLs, decode payloads, and convert between common formats in seconds.
The platform is built for developers, analysts, QA engineers, and operations teams who need reliable output with minimal friction. Supported formats include JSON, CSV, SQL, timestamps, encoded strings, and plain text. Every tool is designed to run directly in the browser, so sensitive data stays on your device while you clean, transform, and verify content before sharing or importing. Each page includes practical examples and related links so first-time visitors can quickly find the right tool for a specific task.
Why use DataToolbox
- Runs entirely in your browser
- No login or signup required
- Your data stays private
- Fast tools for common data tasks
Popular Tools
- JSON Formatter
Beautify JSON with indentation.
- JSON Validator
Validate JSON syntax instantly.
- Remove Duplicate Lines
Keep unique lines while preserving order.
- Base64 Encoder
Encode plain text into Base64 format.
- Base64 Decoder
Decode Base64 content back into readable text.
- UUID Generator
Generate random UUID v4 identifiers instantly.
- Regex Tester
Test regex online and generate starter regex from plain-English descriptions.
- Timestamp Converter
Convert Unix timestamps and date strings into readable time formats.
Tool Categories
JSON Tools
Format, validate, flatten, and convert JSON structures for APIs and reporting.
CSV Tools
Clean, transform, and convert CSV files for spreadsheets and database imports.
Developer Tools
Utilities for encoding, parsing, hashing, timestamps, SQL, and payload debugging.
Text Tools
Remove duplicates, sort lines, and extract values from plain text quickly.
Recently Added Tools
- Website Tech Stack Detector
Detect website technology stack from a URL. Find likely framework, hosting/CDN, analytics, and libraries with confidence and evidence.
- Curl to Fetch Converter
Convert curl commands into JavaScript fetch() code.
- YAML Formatter
Format YAML with consistent indentation for readability.
- Extract URLs from Text
Find and list HTTP/HTTPS URLs from mixed text input.
- Reverse Text
Reverse text characters or reverse word order for quick text transformations.
- Remove Empty Lines
Delete blank lines from multiline text while keeping content lines in order.
- Remove Extra Spaces
Normalize repeated spaces and clean uneven spacing in text.
- Lorem Ipsum Generator
Generate placeholder text by words, sentences, or paragraphs.
Problem-based guides and workflows
- How to Convert JSON to CSV
A step-by-step guide for converting JSON arrays into spreadsheet-ready CSV.
- How to Flatten JSON
Flatten nested JSON structures into tabular fields for analysis and exports.
- How to Clean CSV Data
Learn how to clean inconsistent CSV rows before imports and analysis.
- How to Remove Duplicate Lines
Use Remove Duplicate Lines to clean repeated values while keeping original order.
- How to Decode Base64
Decode encoded payload strings to readable text for debugging and verification.
- How to Generate UUID Values
Generate UUID v4 identifiers for test data, seeding, and integration workflows.