FileExamples
16 Free Tools

Online File Tools

Validate, generate, inspect, and analyze files directly in your browser. No uploads to servers, no signup required. Built for developers and testers.

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.

Syntax validation with error line numbersPretty-print formattingMinification
Open Tool

XML Validator & Formatter

Validate XML syntax, check well-formedness, and format XML documents online. Instant error detection with line numbers.

Well-formedness validationPretty-print formattingMinification
Open Tool

CSV Validator & Viewer

Validate CSV files, check column consistency, detect encoding issues, and preview data in a table format online.

Structure validationTable previewColumn consistency check
Open Tool

YAML Validator & Formatter

Validate YAML syntax, format with proper indentation, and convert between YAML and JSON online.

Syntax validationYAML ↔ JSON conversionIndentation formatting
Open Tool

Utilities

File security and integrity tools

File Checksum Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 checksums for any file online. Verify file integrity instantly in your browser.

MD5, SHA-1, SHA-256, SHA-512Client-side processingDrag & drop upload
Open Tool

Base64 Encoder & Decoder

Encode files and text to Base64 or decode Base64 strings back to their original format. Supports data URIs and raw Base64.

Text & file encodingBase64 decoding to fileData URI generation
Open Tool

Image Format Converter

Convert images between PNG, JPG, WebP, GIF, and BMP formats online. Adjust quality and resize — all in your browser.

PNG, JPG, WebP, GIF, BMPQuality adjustmentImage resizing
Open Tool

JSON ↔ CSV Converter

Convert JSON arrays to CSV or CSV files to JSON online. Handles nested objects, custom delimiters, and header mapping.

JSON to CSV conversionCSV to JSON conversionNested object flattening
Open Tool

Text Encoding Converter

Convert text between UTF-8, ASCII, Latin-1, UTF-16, and other character encodings. Detect and fix encoding issues.

Encoding detectionUTF-8, ASCII, Latin-1, UTF-16Mojibake detection
Open Tool

Markdown Previewer

Preview Markdown rendered as HTML in real time. Supports GFM tables, code blocks, task lists, and export to HTML.

Live previewGFM supportCode block highlighting
Open Tool

Color Picker & Converter

Pick colors and convert between HEX, RGB, HSL, and CSS color formats. Generate palettes and copy code-ready values.

Visual color pickerHEX, RGB, HSL conversionPalette generation
Open Tool

Regex Tester & Debugger

Test regular expressions against text in real time. Highlight matches, capture groups, and get explanations for your patterns.

Real-time matchingCapture group displayPattern explanation
Open Tool

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 automated 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.

Learn About File Formats

Explore our comprehensive file format guides to understand the structure, history, and best practices for popular formats:

.PDF.JSON.CSV.XML.PNG.MP4