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Upload Your Lead File

Drop your CSV or XLSX file below to get started

Drag & Drop your file here

or

Accepts .csv and .xlsx files

Header Detection

Does your file contain a header row?

Yes, first row is header

The first row contains column names like "Name", "Email", "Phone", etc.

No header row

All rows are data. Column names will be auto-generated (Column1, Column2, ...)

Column Names Preview

Column Selection

Choose which columns to keep and identify unique lead fields

Select Columns to Keep

Unique Identifier Column(s)

Select column(s) used to identify duplicate leads (e.g., Email, Phone)

Data Filtering

Clean your data before chunking

Data is already clean

Skip filtering and go straight to chunking

Apply filters

Remove duplicates, empty rows, and clean up the data

Remove empty rows

Remove rows where all cells are empty

Remove duplicate rows

Remove duplicates based on selected unique identifier columns

Remove rows with missing required values

Remove rows missing data in specific columns

Chunk Configuration

How many rows should each output file contain?

Enter the number of rows for each chunk file

Summary & Download

Review your configuration and download the chunk files

Processing Summary

Source File —
File Format —
Total Uploaded Rows —
Rows After Filtering —
Columns Selected —
Rows Per Chunk —
Output Files —

Or download individual files below

What is LeadSlicer?

LeadSlicer is a free, browser-based tool that lets you upload CSV and Excel (XLSX) lead files, filter out duplicates and empty rows, select specific columns, and split your data into smaller chunk files. Everything runs 100% in your browser — your files are never uploaded to any server.

Key Features

Who is LeadSlicer For?

Sales teams, email marketers, lead generation agencies, virtual assistants, and anyone who works with large spreadsheets and needs to split, clean, or organize data quickly.

How Does It Work?

  1. Upload your CSV or Excel file
  2. Choose whether the first row is a header
  3. Select which columns to keep
  4. Apply filters (remove duplicates, empty rows, etc.)
  5. Set your chunk size (rows per file)
  6. Download your chunked files individually or as a ZIP