Replace empty, null, or NA values in CSV data with a custom fill value. Clean your datasets for analysis and migration. Everything runs locally in your browser — nothing is uploaded.
Analyze CSV structure — column types, counts, unique values, and empty cells.
Remove duplicate rows from CSV data based on a specific column. Keep only unique values for cleaner datasets.
Merge two CSV files on a common column. Join datasets horizontally by matching key values, like a SQL JOIN for your spreadsheets.
Convert messy CSV or Excel sheets from clients into clean JSON in one batch. Handles missing values, nested rows, and generates strict JSON schemas for 50+ files at once. Everything runs locally in your browser — nothing is uploaded.
Bidirectional converter between tab-separated values (TSV) and comma-separated values (CSV) with proper quoting. Everything runs locally in your browser — nothing is uploaded.
Null Value Handler lets you replace empty, null, or NA values in CSV data with a custom fill value. Clean your datasets for analysis and migration. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Replace empty, null, or NA values in CSV data with a custom fill value. Clean your datasets for analysis and migration. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Paste or type your content directly into the provided text area.
Yes. After the initial page load, Null Value Handler runs entirely on your device with no internet connection needed. All processing is done locally.
Empty cells, 'null', 'NULL', 'None', 'NA', 'N/A', 'n/a', '-', 'undefined', and whitespace-only cells. All are treated as missing values.
Replace with a custom text value, zero (0), empty string, the column mean/median (for numeric columns), or forward-fill from the previous row.
Yes. Select which columns to process. Leave other columns untouched to preserve their original data.
Yes. The handler detects and processes CSV with comma, semicolon, tab, or pipe delimiters.
No. All processing happens locally in your browser. No CSV data is sent to any server.
CSV Deduplicator
Remove duplicate rows from CSV data based on a specific column. Keep only unique values for cleaner datasets.
CSV Format Validator
Validate CSV formatting — detect inconsistent column counts, quoting errors, and malformed rows. Get detailed issue reports.
Data Format Converter
Convert between JSON, CSV, XML, YAML, and TSV data formats. Pick any input and output format — your files never leave your device.