Online File Tools
Validate, generate, inspect, and analyze files directly in your browser. No uploads to servers, no signup required. Built for developers and QA engineers.
Validators
Check file syntax and structure
JSON Validator & Formatter
Validate, format, and minify JSON data online. Detect syntax errors with line numbers and fix malformed JSON instantly.
XML Validator & Formatter
Validate XML syntax, check well-formedness, and format XML documents online. Instant error detection with line numbers.
CSV Validator & Viewer
Validate CSV files, check column consistency, detect encoding issues, and preview data in a table format online.
Generators
Create sample and test files
Inspectors
Analyze file properties
Utilities
File security and integrity tools
Comparison
Diff and compare files side-by-side
Free Online File Tools for Developers
File Validators
Validate your files instantly in the browser. Our JSON validator, XML validator, and CSV validator detect syntax errors with precise line numbers, format your data for readability, and minify for production use.
File Generators
Generate custom sample files for testing and development. Our sample file generator creates CSV, JSON, XML, and TXT files with custom sizes, row counts, and realistic dummy data. Perfect for QA testing, load testing, and database seeding.
File Inspectors
Analyze file properties without installing software. Our MIME type detector identifies unknown file formats, verifies extensions match content, and reveals magic bytes signatures. All processing happens client-side for privacy.
Security Utilities
Verify file integrity with our checksum generator. Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes for any file directly in your browser. Compare checksums to verify downloads and detect tampering.