📊

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 Wireframe Builder

Drag and arrange chart blocks on a grid to plan your dashboard layout. Export as PNG. No design skills needed.

Chart Type Recommender

Answer 4 quick questions about your data and get an instant recommendation for the best chart type to use.

Data Cleaning Checklist Generator

Upload a CSV and get an automated data quality report — nulls, duplicates, outliers, type mismatches and more.

Data Dictionary Generator

Upload a CSV and auto-generate a full data dictionary with column types, sample values, null counts, and unique values. Export as CSV or Markdown.

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.