Free Developer Tools with
Local Core Processing
Format JSON, decode JWTs, convert Base64, test regex, generate hashes, and access 67+ private utilities — with local processing for core tools and consent for optional AI.
Popular Developer Utilities 10 Featured
Top tools used by engineers for instant daily formatting, encoding, and debugging.
JSON Formatter, Validator & Escape
Format, validate, beautify, escape, and unescape JSON data with instant syntax error detection.
JWT & JWS Decoder Online — Inspect Claims & RFC 7515 Signatures
Decode JWT & JWS tokens online without a secret key. Inspect header, payload claims, expiration dates, and signatures 100% privately in your browser.
SQL Formatter & Beautifier
Format, standardize, and prettify SQL queries for Db2, PostgreSQL, MySQL, and SQLite.
Base64 & Hex Encoder / Decoder — Online UTF-8 Converter
Encode and decode Base64, Hex, and text online with full UTF-8, binary, URL-safe Base64, and image previews. 100% private in-browser converter with zero data uploads.
Cryptographic Hash Generator & MD5 Checksum
Generate and verify MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously with live checksum matching. 100% private in-browser hashing with zero server logging.
Regex Tester & Debugger Online — ReDoS-Safe Sandbox
Test, debug, and validate regular expressions online in real-time with visual match highlighting, group extraction, cheat sheet, and ReDoS protection.
Visual Diff Checker
Side-by-side visual difference comparator for code snippets and raw text with Split & Unified views.
QR Code Generator Online — Create Custom QR Codes (PNG & SVG)
Generate custom QR codes online for URLs, WiFi, vCards, and text. Add logo overlays, custom colors, and export high-res vector SVG or PNG instantly.
SVG to Font Converter — Free SVG to Icon Font Generator (TTF)
Convert SVG icons into TTF & WOFF2 icon webfonts free online. 100% private client-side converter with live glyph preview and CSS @font-face code.
Parse CSR & X.509 Certificate Decoder
Parse CSR online and decode X.509 SSL TLS certificates (.pem, .crt, .csr). Inspect Subject, SANs, validity dates, and public keys 100% in-browser.
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Structured tool collections optimized for software development, data manipulation, and web security.
Developer Tools
JSON, SQL, XML, CSV, Diff, Code Minifiers
Security & Crypto
JWT, Hashes, HMAC, Bcrypt, UUID, AES
Networking & Web
Subnet, IPv6, HAR Analyzer, DNS, Robots.txt
Content & Text
Markdown, Word Counter, Slug, Deduplicator
Design & CSS
Glassmorphism, Flexbox, SVG to PNG, Contrast
Finance & Math
Loan EMI Calculator & Precision Math
AI & Engineering
Prompt Token Counter & LLM Estimators
Complete Tools Directory
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Privacy and offline availability
Core tools process input locally. Optional AI sends the selected snippet through Cloudflare to Cloudflare AI or the optional Google Gemini fallback after consent; provider retention policies apply. Contact submissions send your details to our email provider. Offline use requires the page and its assets to finish caching; external AI and contact delivery require internet.
Browser tools for everyday development
Local core processing, optional AI and clear offline requirements.
Local core tools
Convert SVG to font icons, decode JWS and JWT claims, format JSON, and parse CSR or X.509 certificates directly in client-side browser memory.
Offline after caching
Cached pages and required assets support local tools offline. AI and contact delivery require internet.
AI after consent
Only request AI help when you are comfortable sharing the selected snippet with the configured providers. Requests have a daily quota.
Frequently asked questions
Local core processing, optional AI and clear offline requirements.
Q: Does my input leave my device?
Core tools process input locally. Optional AI sends the selected snippet through Cloudflare to Cloudflare AI or the optional Google Gemini fallback after consent; provider retention policies apply. Contact submissions send your details to our email provider. Offline use requires the page and its assets to finish caching; external AI and contact delivery require internet.
Q: Can I work offline?
Cached pages and required assets support local tools offline. AI and contact delivery require internet.
Q: Are there usage limits?
Core tools are free. Optional AI and contact submissions have server-side quotas and depend on provider availability.
Q: Is independent security certification provided?
The security page describes implementation and internal checks. It does not establish independent certification or guarantee legal compliance for your organization.
Local core tools
Convert SVG to font icons, decode JWS and JWT claims, format JSON, and parse CSR or X.509 certificates directly in client-side browser memory.