Validate CSV structure — flag rows with wrong column counts and empty cells before import. Catch bad rows locally — free, no signup.
Content reviewed October 2026 · About Toolzum
Analyze CSV structure — column types, counts, unique values, and empty cells. Spot malformed rows and mixed types before import.
Rename CSV headers in bulk with old:new mapping — standardize client exports fast. Fix 40 messy columns before import — local parsing, free, no signup.
Remove duplicate rows from CSV data based on a specific column. Keep only unique values for cleaner datasets — local processing, free, no signup.
Validate IBAN structure, length, and mod-97 check digits for 80+ countries. Catch transfer typos before money moves — local ibantools work, free, no signup.
Validate package.json for required fields, semver format, and dependency presence. Catch missing fields and bad semver before installs fail — free, local, no signup.
CSV structure: every row must match the header column count, and no cell may be empty. Issues list exact row numbers and column names.
Paste the whole file to validate row by row with failure positions. Import pipelines gate on zero failures.
Trailing commas and ragged rows change column counts — clean the source export rather than editing flagged rows by hand.
No — validation runs locally in your browser. Data never leaves your device.
Row numbers count the header as row 1, so Row 3 is the 2nd data row with 2 cells where 3 were expected. The Bad Cols preset demos exactly this; empty cells are flagged per column name.
Data Type Converter
Convert values between string, number, boolean, array, and object types with validation. Fix API type mismatches fast — local conversion, free, no signup.
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.
Data Format Converter
Convert data between JSON, CSV, XML, YAML, and TSV with structure preserved. Migrate configs across stacks without rewriting — local PapaParse/xml2js/yaml parsing, free, no signup.