Free Online Developer Tools
Fast, secure tools that run in your browser. No data is sent to any server.
Pick by Intent
Jump directly to the best category for your task.
API & Backend Work
Use JSON/YAML conversion, Base64, and URL encoding fast
Open Data Tools →Security Checks
Generate and verify hashes with MD5/SHA/HMAC
Open Security Tools →Text Operations
Count characters and convert kana/romaji in one place
Open Text Tools →Frontend UI Work
Convert HEX/RGB/HSL and check contrast quickly
Open Design Tools →Recently Used
Quick access to tools you opened recently (stored only on this device).
Favorites
Pin your frequently used tools.
Popular Tools
Hand-picked popular tools to get started quickly.
JSON-YAML Converter
JSON↔YAML converter + JSON format/minify/validate/tree
Try it →Base64 Encoder / Decoder
Base64 for text and files (standard / URL-safe)
Try it →URL Encoder / Decoder
encodeURI / encodeURIComponent / querystring (+) supported
Try it →Hash Generator/Verifier (MD5 / SHA / HMAC)
Hash text/files (MD5/SHA), HMAC (SHA), and verify matches
Try it →Unix Timestamp Converter
Convert timestamps and dates (s/ms/us/ns + batch TSV)
Try it →UUID Generator
Generate UUID v4/v7, bulk output, and validate UUIDs
Try it →Color Code Converter
Convert HEX/RGB/HSL (RGBA/HSLA/HEX8) + contrast ratios
Try it →Character Counter (Lines, Bytes, Words)
Count characters, lines, bytes, and words
Try it →Encoding / Decoding
Base64, URL encoding, HTML entity, and QR code tools for everyday development and debugging.
Base64 Encoder / Decoder
Base64 for text and files (standard / URL-safe)
Try it →URL Encoder / Decoder
encodeURI / encodeURIComponent / querystring (+) supported
Try it →HTML Entity Encoder / Decoder
Convert HTML special characters and named entities (© ® etc.)
Try it →QR Code Generator
Generate QR codes from text and URLs instantly
Try it →Data Conversion
Convert, format, validate, and inspect JSON, YAML, CSV, TOML, and API responses.
JSON-YAML Converter
JSON↔YAML converter + JSON format/minify/validate/tree
Try it →JSON-CSV Converter
Convert JSON arrays to CSV and CSV to JSON
Try it →JSON to TypeScript
Generate TypeScript interfaces from JSON data
Try it →CSV Viewer
Display CSV as a table / row & column stats / file loading
Try it →TOML-JSON Converter
Convert between TOML and JSON / sections, arrays, inline tables
Try it →Security
Hash, HMAC, checksum, and integrity tools for browser-based security checks.
Date & Time
Convert Unix timestamps, UTC/local time, seconds, and milliseconds for logs and APIs.
ID Generators
Generate and validate UUID v4/v7 IDs for test data and distributed systems.
Design
HEX/RGB/HSL converters, palettes, gradients, and box-shadow tools for frontend UI work.
Color Code Converter
Convert HEX/RGB/HSL (RGBA/HSLA/HEX8) + contrast ratios
Try it →Color Palette Generator
Generate harmony palettes from a base color / complementary, analogous, triadic
Try it →CSS Gradient Generator
Visually generate linear-gradient / radial-gradient CSS code
Try it →CSS Box Shadow Generator
Generate CSS box-shadow code with visual controls
Try it →Text
Count characters, lines, bytes, and convert Hiragana, Katakana, and Romaji text.
Character Counter (Lines, Bytes, Words)
Count characters, lines, bytes, and words
Try it →Hiragana ↔ Katakana Converter
Convert Hiragana/Katakana/halfwidth kana/romaji
Try it →Lorem Ipsum Generator
Generate dummy text in Japanese and English by paragraphs, sentences, or words
Try it →Text Escape / Unescape
Escape special characters for HTML, JSON, URL, XML, and CSV
Try it →Unicode Character Lookup
Look up code points, UTF-8 bytes, categories, and blocks for any character
Try it →Text Case Converter
Convert between camelCase, snake_case, kebab-case, and 8 more naming conventions
Try it →Network
IP address, CIDR subnet, and URL parsing tools for troubleshooting and API checks.
Formatters
Format and minify JSON, SQL, HTML, CSS, XML, Markdown, and other code for review.
JSON Formatter
JSON prettify, minify, validate & sort keys
Try it →SQL Formatter
Format SQL queries for readability
Try it →HTML Formatter
HTML beautify & minify tool
Try it →CSS Formatter
CSS beautify & minify tool
Try it →XML Formatter
XML prettify & indent tool
Try it →Markdown Preview
Live Markdown preview rendered as HTML
Try it →Math & Calculation
Binary, decimal, hex, unit, and byte conversion tools for development checks.
Image
Resize, compress, convert, and inspect images locally in your browser.
Image Base64 Converter
Convert between image files and Base64 data URLs
Try it →Image Resizer
Resize images to any dimension using Canvas API
Try it →Image Compressor
Reduce image file size by adjusting JPEG/WebP quality
Try it →Image Format Converter
Convert image formats between PNG, JPEG, and WebP
Try it →SVG Viewer & Optimizer
Preview SVG code and apply basic optimizations
Try it →Cryptography
JWT, AES, PBKDF2, RSA, HMAC, and signature tools for browser-based crypto checks.
JWT Decoder
Decode JWT tokens to inspect header, payload, and expiry
Try it →AES Encrypt / Decrypt
AES-256-GCM text encryption & decryption using Web Crypto API
Try it →Password Hash Generator / Verifier (PBKDF2)
Generate and verify password hashes with PBKDF2 (Web Crypto API)
Try it →RSA Key Pair Generator
Generate RSA public/private key pairs in PEM format (Web Crypto API)
Try it →Password Generator
Generate secure random passwords in bulk with strength indicator
Try it →HMAC Generator
Generate HMAC with SHA-1/256/384/512 using Web Crypto API
Try it →Developer Utilities
Regex, cron, diff, Unix permissions, JSONPath, and text utility tools for daily development.
Regex Tester
Test regular expressions in real time with match highlighting and capture groups
Try it →Cron Expression Parser
Parse cron expressions into human-readable descriptions with next execution times
Try it →Text Diff Checker
Compare two texts and highlight differences
Try it →Unix Permissions Converter
Convert between chmod numeric (755) and symbolic (rwxr-xr-x) notation
Try it →JSONPath Tester
Evaluate JSONPath expressions against JSON data and extract matching values
Try it →Why SkillBridge Tools?
- Everything runs in your browser — no data is ever sent to a server
- Served from edge servers — fast loading from anywhere in the world
- No account required — open and use instantly
- Lightweight and responsive — works on desktop, phone, and tablet
FAQ
Are these tools really free?
Yes. All tools are free to use and no account is required.
Is my input data sent to a server?
No. Processing happens in your browser and input data is not sent to external servers.
Can I use this on mobile?
Yes. The site is responsive and works on phones, tablets, and desktop browsers.