Developer Tools
Free browser-based utilities for formatting, encoding, testing and transforming developer data.
JSON Formatter
Format, validate and minify JSON with syntax feedback.
JSON Validator
Validate JSON with syntax, line and top-level type feedback.
JSON Minifier
Minify JSON with size-savings metrics.
JSON Escape
Escape or unescape JSON string content with metrics and copy controls.
XML Formatter
Format and validate XML with copy-ready output.
XML Minifier
Validate and minify XML with size-savings metrics.
HTML Formatter
Format HTML with readable indentation and output metrics.
HTML Minifier
Minify HTML with comment controls and savings feedback.
SQL Formatter
Format common SQL clauses with readable line breaks.
CSV Viewer
Preview CSV, semicolon or tab data with row and column counts.
CSV Sorter
Sort CSV by column with numeric-aware ordering.
CSV Column Extractor
Extract one CSV column with header controls.
CSV to JSON
Convert comma, semicolon or tab data to JSON.
JSON to CSV
Convert JSON arrays to CSV with copy and download.
Base64 Encoder / Decoder
Encode or decode UTF-8 Base64 text with validation.
Base64 Image Encoder
Convert images to Base64 data URLs with preview and metadata.
JWT Decoder
Decode JWT claims and inspect expiration without verifying signatures.
URL Encoder / Decoder
Encode URL components or decode percent-encoded text.
URL Parser
Inspect host, path, query, hash and other URL components.
Query String Parser
Parse full URLs or query strings into decoded parameters.
Regex Tester
Inspect matches, indexes and capture groups.
UUID Generator
Generate secure RFC 4122 UUID v4 identifiers locally.
Hash Generator
Create SHA-256, SHA-384 and SHA-512 hashes.
CSS Minifier
Remove comments and unnecessary whitespace with savings metrics.
JavaScript Whitespace Minifier
Conservative whitespace cleanup for JavaScript snippets.
Markdown Preview
Write Markdown in a split editor with live preview and export.
HTML Escape / Unescape
Escape HTML-sensitive characters or decode entities.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to readable dates.
Excel to CSV
Export a spreadsheet sheet as CSV.
CSV to Excel
Convert CSV into an XLSX workbook.
Excel to JSON
Convert worksheet rows to JSON objects.
JSON to Excel
Convert JSON arrays into XLSX spreadsheets.
JSON Sorter
Sort JSON object keys alphabetically.
Cron Generator
Build standard 5-field cron expressions.
Cron Parser
Validate and explain cron fields.
Unix Permissions Calculator
Build rwx permissions and octal chmod values.
Chmod Calculator
Convert chmod numbers to symbolic permissions.
CSV Merger
Combine multiple CSV files with matching headers.
CSV Duplicate Remover
Remove duplicate CSV rows by row or column.
Regex Generator
Generate practical regex patterns from presets.
Base64 File Encoder
Encode files to Base64 or decode Base64 back to files.
CSV Splitter
Split large CSV files by row count and download a ZIP.
JSON Schema Validator
Validate JSON data against a JSON Schema locally.
HTTP Status Code Lookup
Look up common HTTP response codes and meanings.
MIME Type Lookup
Find common MIME types from extensions or MIME names.
HTTP Header Parser
Parse raw HTTP headers into structured JSON.
URL Query Parameter Editor
Edit, sort and rebuild URL query parameters.
Developer utilities for everyday debugging
Format JSON, XML, HTML and SQL; inspect URLs and JWTs; transform CSV and spreadsheet data; generate cron expressions; and convert Base64 without setting up a local project.
Local-first tools
Many developer utilities execute entirely in the browser. Tools that require public network data are grouped separately under Network Tools.