Privacy-first · Browser-only · Free
Free online data file tools.
Validate, score, clean, compare, and convert CSV, JSON, Excel, and SQL files - with Health Score diagnostics on every tool. Your data never leaves your device.
Toolkits
50+ tools across five clusters.
17 tools
CSV Tools
Validate, score, clean, compare, split, merge, and convert CSV files.
11 tools
JSON Tools
Validate, format, minify, compare, and convert JSON data.
6 tools
Excel Tools
Compare, deduplicate, split, and convert Excel spreadsheets.
5 tools
Import Validation
Platform-specific CSV validators for Shopify, HubSpot, Salesforce, and more.
12 tools
Developer Tools
SQL formatters, query analyzers, and text utilities.
Featured
Popular tools
CSV Health Score
Get a 0–100 CSV health score with A–F grade, issue breakdown, and actionable recommendations.
CSV Validator
Validate CSV structure, encoding, delimiters, and column consistency instantly.
JSON Validator
Validate JSON syntax with precise error locations.
Excel Health Score
Score Excel data quality — empty cells, type consistency, structure.
Shopify CSV Validator
Validate Shopify product CSV imports — required columns, pricing formats, and data quality.
SQL Formatter
Format SQL queries with keyword-aware indentation.
🔒 No uploads · Browser-only processing · Your files never leave your device
Online data file tools for every task
Data File Tool is a free toolkit for CSV, JSON, Excel, SQL, and text — processed entirely in your browser. Explore our CSV tools, JSON tools, Excel tools, import validators, and developer utilities.
Every file tool includes a Health Score that diagnoses data quality — not just raw output. Explore our guides for validation tips, or read how to validate CSV files.
Frequently Asked Questions
What file formats does Data File Tool support?
We support CSV, JSON, Excel (.xlsx/.xls), SQL queries, and plain text. Each format has dedicated tools for validation, transformation, and quality scoring — all processed locally in your browser. Browse toolkits for CSV, JSON, Excel, import validation, and developer utilities from the home page.
What is a Health Score?
A Health Score is a 0–100 rating with an A–F grade that measures data quality — missing values, duplicates, encoding issues, type consistency, and format-specific problems — with actionable recommendations. Health Score is available on CSV, JSON, and Excel file tools, plus platform import validators.
How do I validate a file online?
Choose the validator for your format — CSV Validator, JSON Validator, or a platform-specific import validator (Shopify, HubSpot, Salesforce, Mailchimp, Airtable). Drop your file and review results instantly. For deeper analysis, use the Health Score tool for your format.
Are my files uploaded to a server?
No. All processing happens locally in your browser. Your files never leave your device — whether you are validating CSV, JSON, Excel, SQL, or text.