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Free Data Tools

CSV, JSON, and data transformation tools

Upload a CSV and remove duplicates, blank rows, and whitespace. Download cleaned file.

JSON to CSV Converter

Paste JSON and instantly convert to CSV. Handles nested objects and arrays.

CSV to JSON Converter

Paste CSV data and instantly convert to a clean JSON array. Handles headers automatically.

Remove Duplicate Lines

Paste any text and instantly remove duplicate lines. Case-sensitive or insensitive.

Word & Character Counter

Count words, characters, sentences, paragraphs, and reading time. Instant as you type.

Outlier Detector

Paste numbers and detect outliers using IQR or Z-score method. Visual highlight of anomalies.

Data Type Detector

Upload a CSV and instantly detect the data type of each column — int, float, date, boolean, string.

Missing Values Checker

Upload a CSV and see the percentage of missing values per column. Identify gaps in your data.

Frequency Distribution

Paste a column of values and see count and percentage for each unique value. Instant frequency table.

Paste a messy list of numbers and sort ascending or descending. Removes blanks automatically.

CSV Column Extractor

Upload a CSV, select which columns to keep, and download the filtered file instantly.

VLOOKUP Simulator

Match two tables on a key column — just like Excel VLOOKUP. No Excel needed. Paste and go.

Dashboard Design System

Build dashboard wireframes with KPI templates for executives, managers, and analysts. Drag chart blocks, add real data, export as PNG. For product teams and BI developers.

Data Visualization Guide

Master data storytelling. Learn the 4 data relationships, chart selection framework, accessibility principles, and when to use Excel vs Tableau vs Python. Interactive recommender tool included.

Data Quality Framework

Standardize your data quality process. Learn the 6 dimensions of data quality (accuracy, completeness, consistency, timeliness, validity, uniqueness), source-specific validation, ETL pipeline checks, and GDPR compliance. Reduce cleaning time from 80% to 20%.

Data Governance Tool

Build audit-ready data governance. Auto-generate data dictionaries with schema, data types, sample values, and compliance metadata. Master GDPR Article 30, SOC 2, and ISO 27001 requirements. For data teams and compliance officers.

File to Markdown Converter

Convert CSV, JSON, XML, HTML, and plain text to clean Markdown for LLMs. Inspired by Microsoft's open-source MarkItDown tool.

Free Data Calculators & Tools

All tools on this page are completely free to use, require no account or signup, and run entirely in your browser. Your data is never sent to a server. Results are instant.

These tools are built for professionals who need quick, accurate answers — not long explanations. Every calculator shows its formula so you can verify the logic.