Free Developer Tools Online
76+ browser-based utilities for developers. No signup, no tracking cookies, no server uploads. Your data never leaves your browser.
Why Developers Choose DevBolt
Most online developer tool sites use hundreds of tracking cookies, send your data to remote servers, and bury tools behind signup walls. DevBolt is different. Every tool runs entirely in your browser — nothing is uploaded, nothing is tracked, nothing is stored. You get instant results with complete privacy, every time.
Privacy by Default
Zero tracking cookies. Zero data collection. All processing happens in your browser using the Web Crypto API and standard JavaScript. Your secrets, tokens, and code never leave your device.
Instant Results
No server round-trips, no loading spinners, no waiting. Paste your input and get results immediately. Works offline too — install the PWA for full offline access.
Clean & Focused
No popups, no dark patterns, no clutter. Every tool has a clean interface designed for speed. Keyboard shortcuts (Ctrl+Enter), one-click copy, and responsive design across all devices.
Format Tools(7)
Clean up messy code in one click
Paste unformatted JSON, SQL, XML, YAML, or minified code and get perfectly indented, syntax-validated output instantly.
Format, validate, and minify JSON data instantly
Write and preview Markdown with live rendering
Format, beautify, and minify SQL queries instantly
Format, beautify, validate, and minify XML documents instantly
Minify and beautify JavaScript, CSS, and HTML code instantly
Validate, format, beautify, and minify YAML documents instantly
Optimize SVGs by removing metadata, comments, editor data, and unnecessary attributes
Convert Tools(19)
Transform data between any format
Base64, hex, binary, CSV, JSON, YAML, TOML, Markdown, TypeScript types — convert between formats without installing anything.
Encode and decode Base64 strings with Unicode support
Convert colors between HEX, RGB, and HSL formats
Convert Unix timestamps to dates and back
Convert text between camelCase, snake_case, kebab-case, and more
Convert numbers between binary, octal, decimal, and hex
Convert between CSV and JSON formats with custom delimiters
Encode and decode URLs with encodeURIComponent and encodeURI
Convert between JSON and YAML for Kubernetes, Docker, and CI/CD configs
Encode and decode HTML entities, special characters, and symbols
Convert images to Base64 data URIs or decode Base64 back to images
Generate TypeScript interfaces and type aliases from JSON data
Convert between HTML and Markdown in either direction
Compress and resize images with adjustable quality — JPEG, WebP, and PNG
Convert text to binary, hexadecimal, octal, or decimal and decode back with UTF-8 support
Convert text into clean, URL-friendly slugs with Unicode transliteration and bulk mode
Convert cURL commands to JavaScript, Python, Go, PHP, Ruby, and Java code instantly
Convert JSON arrays to CSV with nested object flattening, column selection, and .csv download
Convert between TOML, JSON, and YAML — perfect for Cargo.toml and pyproject.toml
Base64, Base32, Hex, Binary, URL, and HTML encoding & decoding all in one tool
Generate Tools(28)
Create what you need, fast
UUIDs, passwords, hashes, QR codes, placeholder images, CSS effects, meta tags, config files, and more — generated entirely in your browser.
Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes
Generate random UUID v4 identifiers in bulk
Generate strong, secure random passwords
Generate placeholder text for designs and layouts
Create beautiful CSS gradients visually with live preview
Generate customizable QR codes from text or URLs
Generate harmonious color palettes using color theory algorithms
Design CSS box shadows visually with multiple layers, presets, and live preview
Build CSS flexbox layouts visually with live preview, item config, and presets
Build CSS grid layouts visually with columns, rows, gap, item placement, and presets
Design CSS border-radius visually with per-corner controls, unit selection, and presets
Design CSS text shadows visually with multiple layers, presets, and live preview
Build CSS keyframe animations visually with presets, live preview, and copy-ready code
Build Markdown tables visually with an interactive editor, CSV import, and alignment controls
Generate SEO, Open Graph, and Twitter Card meta tags with live Google and social previews
Generate .gitignore files from 50+ templates — Node.js, Python, Java, Go, Rust, and more
Build cron expressions visually — select frequency, time, and days to generate cron schedules
Generate favicons from text or emoji — download PNGs, SVG, Apple Touch Icon, and HTML tags
Build Tailwind CSS utility classes visually with live preview and component presets
Generate a customized privacy policy with GDPR, CCPA, cookies, analytics, and payment sections
Generate realistic fake JSON data for API testing with 30+ field types, preset templates, and schema builder
Generate professional GitHub README.md files with badges, installation steps, usage examples, and more
Generate robots.txt files with crawl rules for Googlebot, Bingbot, AI bots, and more — presets included
Generate Zod validation schemas from JSON — auto-detects emails, URLs, UUIDs, dates, and nested objects
Generate custom placeholder images for wireframes, mockups, and prototyping with custom dimensions and colors
Generate nginx configuration files — server blocks, SSL, reverse proxy, gzip, load balancing, and security headers
Convert text into ASCII art with 7 font styles — banner, block, shadow, slim, star, dot, lines — with comment wrapping for code
Generate regex patterns by describing what you need — 60+ curated patterns, visual composer, live tester, and pattern explanations
Inspect Tools(22)
Decode, validate, and debug
JWT tokens, regex patterns, URLs, Dockerfiles, Kubernetes manifests, OpenAPI specs — inspect and validate without leaving your browser.
Decode and inspect JSON Web Tokens instantly
Test regular expressions with real-time match highlighting
Parse URLs into protocol, host, path, and query params
Compare two texts and see differences highlighted
Parse cron schedules into plain English with next run times
Count words, characters, sentences, and estimate reading time
Calculate Unix file permissions with an interactive permission matrix
Test JSONPath expressions against JSON data with real-time evaluation
Check WCAG 2.1 color contrast ratios for AA and AAA accessibility compliance
Validate JSON data against JSON Schema (Draft 07) with detailed error reporting and schema generation
Subnet calculator, VLSM divider, IP range to CIDR converter, and IP address classifier
Preview and debug Open Graph, Twitter Card, and SEO meta tags for social sharing
Run JavaScript and TypeScript code in your browser with instant console output
Compare two JSON objects and see structural differences — added, removed, and changed keys
Validate and format Docker Compose files — check services, networks, volumes, and dependencies
Complete HTTP status code reference — 1xx, 2xx, 3xx, 4xx, 5xx with detailed explanations and use cases
Test date format patterns for strftime, date-fns, Moment.js, Go, and Java with live preview and token reference
Validate and lint Dockerfiles for syntax errors, security issues, best practices, and layer optimization
Validate Kubernetes manifests for syntax, required fields, best practices, security, and resource limits
Validate OpenAPI 3.x and Swagger 2.0 specs for structure, paths, schemas, security, and best practices
Validate .env files for syntax errors, duplicate keys, security risks, and best practices — export .env.example templates
Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 file hashes — drag and drop to verify integrity with checksum comparison
Ready to Try?
Pick any tool above and start using it immediately. No signup, no credit card, no time limit. Every tool is free and runs in your browser.
Frequently Asked Questions
Are these developer tools really free?
Yes, every tool on DevBolt is 100% free to use with no signup required. Power users can upgrade to Pro for higher daily limits, API access, and batch processing, but the core tools are free forever.
Is my data safe when using these tools?
Absolutely. Every tool runs entirely in your browser using client-side JavaScript. Your data never leaves your device — nothing is sent to our servers. We use zero tracking cookies and only collect anonymous, cookieless page-view analytics via Vercel Analytics.
Do I need to create an account?
No. All tools work immediately — no accounts, no email verification, no popups. Just open a tool and use it.
Can I use these tools offline?
Yes. DevBolt is a Progressive Web App (PWA). Install it from your browser and use tools offline — all processing happens locally.
What makes DevBolt different from other developer tool sites?
Three things: privacy (100% client-side, zero cookies), speed (no server round-trips, instant results), and focus (clean UI, no clutter, no dark patterns). Most competitor sites use 500+ tracking cookies and send your data to their servers. We don't.
How many tools does DevBolt have?
DevBolt currently offers 76+ free tools across four categories: Format, Convert, Generate, and Inspect. New tools are added regularly based on developer demand and search trends.