CSV Tools

Deduplicate CSV Files Online

Remove duplicate rows from CSV files instantly in your browser. No upload, no server — 100% private.

Filter CSV Files Online

Filter rows in CSV files by column value, directly in your browser. Your data stays on your device.

Sort CSV Files Online

Sort CSV files by any column, ascending or descending, directly in your browser.

Split CSV Files Online

Split CSV files into multiple smaller files by row count, directly in your browser.

Sample CSV Files Online

Sample rows from CSV files — first N, last N, or random — directly in your browser.

Manage Columns in CSV Files Online

Drop or select specific columns from CSV files directly in your browser. No upload required.

Rename Columns in CSV Files Online

Rename columns in CSV files instantly in your browser. No upload, no server — your data stays on your device.

Merge CSV Files Online

Merge and concatenate multiple CSV files into one, directly in your browser.

Trim Whitespace in CSV Files Online

Trim leading and trailing whitespace from all text columns in CSV files, directly in your browser. No upload required.

Fill Empty Values in CSV Files Online

Fill empty and null values in CSV files with a custom replacement value, directly in your browser.

Transpose CSV Files Online

Transpose CSV files — flip rows and columns — directly in your browser. No upload, no server.

Change Delimiter in CSV Files Online

Change the delimiter in CSV files — switch from comma to pipe, semicolon, tab, or any custom character — in your browser.

Extract Head of CSV Files Online

Extract the first N rows from CSV files directly in your browser. Choose how many rows to keep and download the result — no upload required.

Extract Tail of CSV Files Online

Extract the last N rows from CSV files directly in your browser. Choose how many rows to keep and download the result — no upload required.

Add Row Numbers to CSV Files Online

Add a row number index column to CSV files directly in your browser. Set the column name and starting number — no upload required.

Validate CSV Files Online

Validate CSV file structure in your browser. Check null counts, distinct values, and data types for every column — no upload required.

Count Values in CSV Files Online

Group and count rows by any column in CSV files directly in your browser. Sort by frequency or value to find the most common entries — no upload required.

Extract Unique Values from CSV Files Online

Extract all distinct values from any column in CSV files directly in your browser. Download the unique values list — no upload required.

Compare CSV Files Online

Compare two CSV files directly in your browser. See rows only in file A, only in file B, and rows common to both — no upload required.

Format Timestamps in CSV Files Online

Reformat timestamp and date columns in CSV files directly in your browser. Convert between ISO 8601, Unix epoch, US date, and custom strftime patterns — no upload required.

Find & Replace in CSV Files Online

Find and replace text values in CSV files directly in your browser. Supports plain text and regex patterns across any column — no upload required.

Split Column in CSV Files Online

Split a column into multiple columns by delimiter in CSV files directly in your browser. Turn "First Last" into separate first and last name columns — no upload required.

Combine Columns in CSV Files Online

Combine multiple columns into one in CSV files directly in your browser. Merge first name and last name, join address fields, or concatenate any columns with a custom separator — no upload required.

Convert Case in CSV Files Online

Convert text columns to UPPERCASE, lowercase, or Title Case in CSV files directly in your browser. Apply case conversion to any or all text columns at once — no upload required.

Aggregate CSV Files Online

Group and aggregate CSV files by any column directly in your browser. Calculate sum, average, min, max, and count for any numeric column — no upload required.

Round Numbers in CSV Files Online

Round numeric columns in CSV files to any number of decimal places directly in your browser. Set precision per column with a simple slider — no upload required.

Add Conditional Column to CSV Files Online

Add a new column to CSV files based on an if/else condition directly in your browser. Set a value for rows that match and a different value for rows that don't — no upload required.

Extract with Regex from CSV Files Online

Extract text matching a regular expression from CSV files directly in your browser. Pull out emails, URLs, phone numbers, or any pattern into a new column — no upload required.

Parse Dates in CSV Files Online

Parse and convert date columns in CSV files between formats and timezones directly in your browser. Supports ISO 8601, US/EU dates, Unix timestamps, and custom patterns — no upload required.

Compare Schema of CSV Files Online

Compare the schemas of two CSV files directly in your browser. See which columns exist in each file and spot type mismatches — no upload required.

Cast Column Types in CSV Files Online

Change column data types in CSV files directly in your browser. Cast text to numbers, dates to timestamps, or any supported type conversion — no upload required.

Unpivot CSV Files Online

Reshape CSV files from wide to long format directly in your browser. Melt multiple columns into variable/value pairs — no upload required.

Repair CSV Files Online

Repair malformed CSV files directly in your browser. Fix unbalanced quotes, inconsistent column counts, BOM markers, and mixed line endings — no upload required.

Convert Encoding of CSV Files Online

Detect and convert the character encoding of CSV files directly in your browser. Switch between UTF-8, Latin-1, Windows-1252, and more — no upload required.

Shuffle CSV Files Online

Randomly shuffle the row order of CSV files directly in your browser. Useful for randomising data before sampling or ML train/test splits.

Bin Column in CSV Files Online

Bucket a numeric column in CSV files into labelled ranges — equal-width bins or custom edges. Runs entirely in your browser.

Add Calculated Column to CSV Files Online

Add a new column to CSV files computed from an arithmetic expression over existing columns. No formulas, no code — just point and click.

Extract JSON Column from CSV Files Online

Extract values from a JSON-encoded column in CSV files into a new flat column using a JSON path expression. Runs in your browser.

Calculate Date Difference in CSV Files Online

Calculate the difference between two date or timestamp columns in CSV files directly in your browser. Output in days, months, years, hours, minutes, or seconds — no upload required.

Normalize Columns in CSV Files Online

Normalize numeric columns in CSV files using min-max scaling (0–1) or z-score standardisation (mean=0, std=1). Adds new columns alongside the originals — no upload required.

Rank Rows in CSV Files Online

Add a rank column to CSV files based on any column's values. Choose RANK, DENSE RANK, or ROW NUMBER, with optional partitioning — runs entirely in your browser.

Add Cumulative Sum to CSV Files Online

Add a running total column to CSV files for any numeric column. Optionally order by a date or sequence column and restart totals per group — no upload required.

Detect Outliers in CSV Files Online

Detect statistical outliers in CSV files directly in your browser. Flag or remove rows where numeric values exceed a chosen number of standard deviations from the mean — no upload required.

Validate Email Addresses in CSV Files Online

Validate email addresses in CSV files directly in your browser. Add a boolean column flagging valid and invalid emails, or filter to show only invalid rows — no upload required.

Add Moving Average to CSV Files Online

Add a moving average, rolling sum, rolling min, or rolling max column to CSV files directly in your browser. Choose window size, order-by column, and optional partitioning — no upload required.

Search Text in CSV Files Online

Search for text across all string columns in CSV files directly in your browser. Filter rows to only those containing your search term and download the results — no upload required.

Get Top N Rows from CSV Files Online

Extract the top N rows per group from CSV files directly in your browser. Get the top 5 products per category, highest scores per team, or any ranked subset — no upload required.

Add Percent of Total to CSV Files Online

Add a percentage-of-total column to CSV files directly in your browser. Show each row's share of the grand total, or the share within each group — no upload required.

Parse URL Column in CSV Files Online

Parse URL columns in CSV files and extract host, path, query string, and fragment into separate columns — directly in your browser, no upload required.

Add Lag / Lead Column to CSV Files Online

Add a LAG or LEAD column to CSV files to shift any column forward or backward by N rows. See previous day's sales, next value in a sequence, or any time-shifted comparison — runs entirely in your browser.

Filter by Date Range CSV Files Online

Filter CSV files to rows within a date range using simple start and end date pickers. See a live match count before you apply the filter — no upload required, runs in your browser.

Compute Correlation Matrix for CSV Files Online

Compute a Pearson correlation matrix for numeric columns in CSV files directly in your browser. Instantly spot which variables move together — colour-coded heatmap, no upload required.

Find Fuzzy Duplicates in CSV Files Online

Find near-duplicate rows in CSV files using Levenshtein edit distance or Jaro-Winkler similarity — all in your browser. Set your own threshold and download the matched pairs as CSV — no upload required.

Hash & Anonymise Columns in CSV Files Online

Anonymise or pseudonymise columns in CSV files by replacing values with MD5, SHA-256, or DuckDB hashes — directly in your browser. Useful for GDPR compliance and sharing data without exposing PII — no upload required.

Group Concatenate CSV Files Online

Concatenate text values within each group in CSV files directly in your browser. Group rows by a column and join the values of another column into a single delimited string — no upload required.

Truncate Dates in CSV Files Online

Truncate date and timestamp columns in CSV files to a chosen precision — year, quarter, month, week, day, hour, or minute — directly in your browser. Rounds timestamps down to the start of each period. No upload required.

Coalesce Columns in CSV Files Online

Fill null values in CSV files from other columns — return the first non-null value across up to 8 columns in priority order. Add the result as a new column. Runs entirely in your browser.

Add UUID Column to CSV Files Online

Add a UUID column to CSV files directly in your browser. Generate random UUIDv4 or time-ordered UUIDv7 identifiers for every row. Choose the column name and position — no upload required.

Pad Column in CSV Files Online

Left-pad or right-pad a column in CSV files to a fixed width directly in your browser. Zero-pad numeric codes, pad product IDs to a fixed length, or right-pad text fields — no upload required.

Compute Percentiles for CSV Files Online

Compute percentiles, median, MAD, mode, and kurtosis for numeric columns in CSV files directly in your browser. Optionally group by a category column. Results download as CSV — no upload required.

Find Arg Max / Min in CSV Files Online

Find the value of one column at the row where another column is maximum or minimum in CSV files — directly in your browser. Optionally group by a category to get per-group results. No upload required.

CSV Viewer Online

View and inspect CSV files directly in your browser. Browse rows, check column names and data types — no upload required, your data stays on your device.