Text & String
Word Counter Case Converter String Reverse Duplicate Line Remover Sort Lines Text Diff Checker Lorem Ipsum Generator Slug Generator Text Repeater
Web / HTML
HTML Encoder/Decoder URL Encoder/Decoder HTML Formatter HTML Minifier HTML to Markdown Markdown to HTML Meta Tag Generator OG Tag Generator Robots.txt Generator .htaccess Generator Favicon Generator
CSS Tools
CSS Formatter CSS Minifier Box Shadow Generator Border Radius Generator Gradient Generator Flexbox Visualizer Grid Generator px ↔ rem Converter CSS Specificity Calc
JS & JSON
JS Formatter JS Minifier JSON Formatter JSON to CSV JSON to XML JSON Path Tester
Encode & Hash
Base64 Encoder/Decoder URL-Safe Base64 MD5 Hash Generator SHA Hash Generator HMAC Generator BCrypt Hash Generator JWT Decoder Password Generator Password Strength File Hash Generator
Generators
UUID Generator Nano ID Generator Random String Generator QR Code Generator Barcode Generator
Date & Time
Unix Timestamp Date Difference Timezone Converter Cron Builder
Color Tools
Color Picker Palette Generator Contrast Checker Tint & Shade Image Color Extractor
Regex & Testing
Regex Tester Diff Checker cURL Generator HTTP Status Codes MIME Type Lookup
Number & Math
Number Base Converter Roman Numeral Converter Random Number Generator Percentage Calculator Ratio Calculator
Miscellaneous
IP Lookup DNS Lookup SSL Checker Word Frequency CSV Table Viewer CSV to JSON XML Formatter YAML to JSON JSON to YAML SVG Optimizer
79 free tools · no sign-up required
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Developer Toolbox.

79 essential tools for web developers & programmers to help improve code with less effort. Format, validate, encode, generate, convert & more — Everything runs in your browser. Nothing stored, nothing sent.

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11 Categories · 79 Tools

Text & String
9 tools
Web / HTML
11 tools
CSS Tools
9 tools
JS & JSON
6 tools
Encode & Hash
10 tools
Generators
5 tools
Date & Time
4 tools
Color Tools
5 tools
Regex & Testing
5 tools
Number & Math
5 tools
Miscellaneous
10 tools
Most Popular

Top Tools This Week

JSON Formatter
Validate & pretty-print JSON
Base64 Encoder/Decoder
Encode & decode Base64 strings
Regex Tester
Live regex match highlighting
UUID Generator
v1, v4, bulk generation
Password Generator
Secure, customizable passwords
Color Picker
HEX ↔ RGB ↔ HSL ↔ HSV
Why DevToolShack

Built for programmers & developers who just want the tools to make coding easier.

Most free online developer tools make you jump through hoops — create an account, confirm your email, choose a plan, then hit a usage limit the moment you actually need something. DevToolShack doesn’t work that way. All 79 tools are genuinely free, with no sign-up, no rate limits, and no paywalls hiding the useful features. Every tool — from the JSON formatter and Base64 encoder to the regex tester, UUID generator, and color picker — runs entirely in your browser using client-side JavaScript. Your code and data never leave your device, results are instant, and the full toolkit works on any device without installing a single thing. Open a tab, use the tool, get back to building.

Nothing Stored
Every tool on DevToolShack runs entirely in your browser using client-side JavaScript. Your code, text, passwords, and data never leave your device — nothing is transmitted to our servers, logged, or stored anywhere. Whether you’re formatting sensitive JSON, generating secure passwords, or hashing private strings, your data stays completely private from start to finish.
Instant Results
Because all 79 developer tools run as pure JavaScript directly in your browser, there are no server round-trips, no upload queues, and no waiting. Results appear the moment you type — whether you’re validating JSON, testing a regex pattern, encoding Base64, or converting color codes. Fast, responsive tools that keep up with how developers actually work.
Any Device
DevToolShack is fully responsive and works on desktop, laptop, tablet, and mobile — no app to install, no browser extension required. Every tool is optimized for Chrome, Firefox, Safari, and Edge. Whether you’re at your desk debugging code or need a quick UUID or timestamp conversion on the go, the full toolkit is always just a URL away.
Always Free
All 79 developer tools are completely free — no account, no sign-up, no usage limits, and no paid tiers. There are no paywalls hiding the useful features and no rate limits throttling your workflow. Free online developer tools should actually be free, and at DevToolShack, every tool, every feature, and every result is yours with no strings attached.

Our toolkit covers every major area of day-to-day development: text & string manipulation, JSON formatting & validation, HTML & CSS tools, Base64 & URL encoding, MD5, SHA & hash generation, regex testing, UUID & password generation, color conversion, date & timestamp utilities, number & math tools, and miscellaneous developer utilities — all in one place, all completely free. Whether you’re a front-end developer formatting CSS, a back-end programmer debugging API payloads, or a full-stack engineer who just needs a fast JWT decoder or a quick diff check, DevToolShack has the browser-based tools to keep your workflow moving without the friction.