Free Browser-Based
Developer Tools & Utilities
High-performance utilities for code, data, and content. Zero friction. 100% Free.
Every tool runs entirely in your browser using JavaScript and WebAssembly. Your data — JSON payloads, JWT tokens, PDFs, subtitles — is never uploaded to a server. No accounts. No tracking. No logs. Ever.
Developer & Network Tools
DNS Lookup
Advanced DNS propagation check, SPF/DMARC analysis & record lookup.
Text Diff
Find diffs or perform a text compare between two files or code blocks with side-by-side diff.
Whats My IP?
Detect public IPv4, IPv6, VPN usage, and test for WebRTC leaks.
SSL/CSR Decoder
Decode SSL certificates and CSRs securely in your browser. Supports RSA and ECDSA.
IP Tools
Universal subnet calculator, IP list sorter, and CIDR splitter utilities.
Header View
Inspect response headers, trace redirects, and bypass WAFs.
Akamai Debugger
Inject Pragma payloads, extract True Cache Keys, and analyze edge latency waterfalls.
WHOIS
Check domain registration, expiry, registrar, name servers and DNSSEC via RDAP.
JSON Tool
Validate, beautify, and auto-repair broken JSON data instantly.
Code Minifier
Instantly compress and minify JS, CSS, and HTML with AST-based parsers.
Data Converter
Convert config files between YAML, JSON, XML, and TOML securely.
SQL Formatter
Format and beautify messy SQL queries for various dialects locally.
chmod Calc
Visual Linux file permissions calculator (octal, symbolic, checkboxes).
JWT Decoder
Debug JSON Web Tokens and timestamps without server requests.
Base64 Tool
Safely encode or decode plain text and files into Base64 Data URIs.
Hash HMAC
Generate secure hashes and HMAC signatures using MD5, SHA-256, and SHA-512.
cURL to Code
Translate raw curl commands into Python, Fetch, Axios, PHP, and Go instantly.
Docker Help
Generate optimized, multi-stage, security-hardened Dockerfiles & Compose configs.
Edge Lab
Visually generate syntax-perfect rules for Cloudflare, NGINX, Apache, and AWS WAF.
CSP Validator
Analyze policies, detect vulnerabilities, and generate optimized server baselines.
Epoch Guide
Convert Unix timestamps to human-readable dates and vice versa.
Cron Job
Generate and parse complex cron expressions and view upcoming executions.
AI & Data Generators
AI Chatbot
Smart conversational assistant for quick programming answers.
llms.txt Builder
Generate perfectly formatted rules to control how AI agents crawl your site.
Regex Builder
Generate complex Regular Expressions using plain English prompts.
QR Generator
Create customizable, high-res QR codes for URLs, Wi-Fi, and vCards.
BG Remover
Instantly erase image backgrounds entirely in your browser using local AI.
SecurePass
Create cryptographically strong passwords and EFF passphrases.
Lottery Gen
Randomized, CSPRNG number picker for 30 global lotteries.
Text, Media & PDF Utilities
Subtitle Fix
Mass edit, time-shift, clean, and convert SRT/VTT subtitle files.
PDF Tools
Merge, split, unlock, and compress PDF documents securely.
HTML to Text
Strip HTML tags and extract clean readable text.
Image to Text
Extract text from images, screenshots, and documents using local browser OCR.
Word Stat
Real-time word, character, and sentence analytics.
Case Convert
Toggle between UPPER, lower, camelCase and more.
Text Cloaker
Protect your writing from AI scrapers using invisible text obfuscation.
Calculators & Converters
Weather
Live local weather, forecasts, and conditions powered by OpenWeatherMap.
Image Lab
Convert JPG, PNG, WEBP and compress to exact file sizes.
Unit Convert
Convert length, weight, temperature, data units, and view formulas.
Calculator
Standard scientific calculator with smart token memory.
Tip Guide
Calculate gratuity and split bills easily.
Why Developers Choose Expert Web Tools
Expert Web Tools is a privacy-first suite of 40+ free browser-based utilities built for software engineers, DevOps professionals, and web creators. Unlike cloud-based alternatives, every tool — from the WAF Rule Builder and Dockerfile Generator to the JWT Decoder and PDF merger — processes your data 100% locally using WebAssembly and JavaScript. Nothing is sent to a server. Zero logging. No sign-up required.
Whether you need to translate a cURL command into Python in seconds, visually build a Cloudflare firewall rule, decode a JSON Web Token safely, or batch-edit hundreds of subtitle files, Expert Web Tools provides the fastest, most private way to get it done directly in your browser.
Frequently Asked Questions
Are the tools on Expert Web Tools really free?
Yes. Every utility on Expert Web Tools is 100% free with no premium tiers, no paywalls, and no account registration required.
Do you log or store my sensitive data, like JWTs or SSL certificates?
No. All data processing—including decoding SSL CSRs, formatting JSON, and verifying JWTs—happens 100% locally in your browser using client-side JavaScript. Your sensitive data is never sent to a server.
How do the image tools (OCR, Background Remover) work without a server?
Our advanced image utilities use lightweight WebAssembly (Wasm) and local ONNX AI models. This allows your device's CPU/GPU to extract text and remove backgrounds directly inside the browser, keeping your images completely private.
Why should I use the Visual WAF Builder instead of writing rules manually?
Manually writing regex for edge firewalls can lead to Regex Denial of Service (ReDoS) or syntax errors. Our builder visually generates syntax-perfect, safe configurations specifically for RE2 and PCRE environments like Cloudflare, AWS WAF, and NGINX.
Can I convert config files or format SQL offline?
Yes. Once you load Expert Web Tools, our Progressive Web App (PWA) caches the core utilities. You can continue converting YAML/JSON, formatting SQL, or calculating subnet masks even if you lose your internet connection.
How does the Anti-AI Text Cloaker protect my content?
The cloaker injects invisible homoglyphs and zero-width characters into your text. When posted online, humans read the text normally, but AI scrapers and tokenizers parse it as gibberish, preventing your work from being used in AI training datasets.
