Free Developer Tools
Fast browser-based developer utilities. Tools that support client-side processing run in your browser without requiring a developer API account.
JSON Formatter
Prettify JSON with customizable indentation & collapsible tree viewer.
JSON Validator
Validate JSON syntax and pinpoint exact line and column errors.
JSON Minifier
Strip whitespace with real before-and-after byte count verification.
JSON to CSV
Convert JSON object arrays to CSV with dot-notation flattening.
CSV to JSON
Parse CSV files into clean JSON objects with RFC 4180 quote support.
JSON to XML
Transform JSON data structures into well-formed, indented XML markup.
XML to JSON
Convert XML documents into structured JSON objects using browser DOM parser.
JSON to YAML
Convert structured JSON payloads to clean YAML documents.
YAML to JSON
Parse YAML configuration into formatted JSON with syntax validation.
JSON Diff
Side-by-side structural diff of two JSON documents highlighting changes.
Base64 Encoder / Decoder
Encode & decode text or binary files to Base64 in both directions.
Base64 to Image
Decode Base64 string into a downloadable image file with live preview.
Image to Base64
Convert image files into data URIs with copyable HTML and CSS snippets.
URL Encoder / Decoder
Encode or decode URI components and query string parameters.
HTML Entity Encoder
Escape and unescape special characters to safe HTML entities.
JWT Decoder
Decode JSON Web Token header and payload claims client-side.
SHA-256 Hash Generator
Calculate SHA-256 digests for text strings or files via Web Crypto.
SHA-1 Hash Generator
Generate 160-bit SHA-1 checksums for strings and binary files.
SHA-512 Hash Generator
Compute 512-bit secure hash algorithms for verification.
MD5 Hash Generator
Compute 128-bit MD5 checksums for legacy hash verification.
File Checksum Verifier
Drop a file to compute SHA-256, SHA-1, SHA-512, MD5 with match verification.
HTML Formatter
Prettify and indent messy HTML markup with tag preservation.
CSS Formatter
Beautify and indent CSS stylesheets for clean readability.
CSS Minifier
Strip comments and whitespace with real byte-reduction stats.
JavaScript Formatter
Format and indent JS/TS code with custom brace and quote styles.
SQL Formatter
Beautify queries for PostgreSQL, MySQL, SQLite, and Transact-SQL.
XML Formatter
Pretty-print XML documents with syntax validation and indentation.
UUID Generator v4
Generate random UUID v4 identifiers in bulk up to 1,000 using Web Crypto.
Password Generator
Cryptographic random passwords with entropy bits calculation.
Random String Generator
Secure random strings with customizable length and character sets.
Lorem Ipsum Generator
Generate classical Latin placeholder paragraphs, sentences, and words.
Regex Tester & Debugger
Live match highlighting, flag toggles, and capture group inspection.
Text Diff Checker
Side-by-side and inline text difference checker (line and word level).
Timestamp Converter
Unix epoch to human-readable dates across timezones and vice versa.
Cron Expression Parser
Translate cron schedules into plain English with upcoming occurrences.
Number Base Converter
Convert between Binary, Octal, Decimal, and Hex with BigInt precision.
URL Slug Generator
Transform strings into clean, SEO-friendly URL slugs.
String Case Converter
Convert text to camelCase, snake_case, kebab-case, PascalCase, etc.
Query String Parser
Parse URL parameters into editable key-value grid or build queries.
Color Converter
HEX, RGB, HSL, HSV, CMYK conversions with mathematical precision.
Palette Extractor
Extract dominant colors from uploaded images using K-Means clustering.
WCAG Contrast Checker
Test color pairs for WCAG 2.1 AA and AAA accessibility compliance.
CSS Gradient Generator
Visual linear and radial gradient builder with one-click CSS export.
What is Developer Tools & Utilities?
The Developer Tools are quick utilities for everyday engineering work that you can use on sensitive data because nothing leaves your browser. Format, validate, minify and diff JSON; convert between JSON, CSV, XML and YAML; encode and decode Base64, URLs and HTML entities; decode JWTs; generate SHA-1, SHA-256, SHA-512 and MD5 hashes of text or files; beautify HTML, CSS, JavaScript, SQL and XML; generate UUIDs, passwords and random strings; test regular expressions; explain cron expressions; convert timestamps and number bases; and work with colours, contrast and gradients. Hashing uses the native Web Crypto API.
How to use Developer Tools & Utilities
- 1
Choose a utility
Pick a formatter, converter, encoder, hash or generator.
- 2
Paste your input
Paste JSON, text, a token or a file; most tools update as you type.
- 3
Copy the result
Copy the output or download it.
Frequently asked questions
Is it safe to paste API tokens or production data?
Yes. Parsing, decoding and hashing run in your browser’s JavaScript engine; the data is not sent to a server.
Does the JSON validator show where the error is?
Yes. Invalid JSON produces the parser’s error message, including the position where parsing failed.
Can I hash files, not just text?
Yes. The hash generators and File Checksum accept files and compute SHA-1, SHA-256, SHA-512 and MD5 locally.
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