Null Value Handler
Fill null (empty) cells in CSV data with a custom fill value. Clean datasets for analysis and migration — local processing, free, no signup.
How to Use the Null Value Handler
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Frequently Asked Questions
What null patterns does it detect?
Empty and whitespace-only cells. Literal strings like 'null' or 'NA' are left untouched — only truly blank cells are filled.
What fill options are available?
One custom fill text applied to every empty cell — type your own or pick a preset like N/A, NULL, or 0. No mean/median or forward-fill modes.
Can I fill only specific columns?
No. Every empty cell in every column gets the same fill value. Split out columns you want to preserve first.
Does it handle different CSV delimiters?
No — comma-separated values only. Semicolon, tab, or pipe files need converting to commas first.
When using Null Value Handler, is my CSV data stored?
No. All processing happens locally in your browser. No CSV data is sent to any server.
How many nulls does the Default preset contain?
3: a missing phone, a missing email, and another missing phone across the demo rows — each replaced by the chosen token (N/A by default). Only whitespace-empty cells count; literal null text is left alone.
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Last updated October 2026