Free Online Tools — 55+ Browser Utilities
Jump to a category below and get to work. No signup, no uploads — everything runs in your browser.
Text Tools
Word Counter, Case Converter, Lorem Ipsum, Diff, Slug Generator, Markdown Preview.
Developer Tools
JSON Formatter, Base64, JWT Decoder, Regex Tester, UUID, QR Code, Cron, Chmod, and more.
Security & Encoding
Password Generator, Hash Generator (MD5/SHA), URL Encode & Decode.
Image Tools
Image Compressor, Image Resizer, Color Picker & Converter, Favicon Generator, Image Format Converter.
Network & Lookup
What’s My IP, DNS Lookup, WHOIS, Website Status, HTTP Headers, Redirect Checker, SSL Check, Subnet Calculator.
Data & Conversion
CSV ↔ JSON, XML ↔ JSON, JSON ↔ YAML converters.
File & PDF
PDF Merge, PDF Split, PDF Compress — all in-browser, no upload.
Calculators
BMI, Calorie, Loan, Compound Interest, Dividend, Discount, Salary, Date Difference, Percentage, Age, Unit, Currency, Timezone, Aspect Ratio, Random Number.
SEO & Content
Meta Tag Generator, SERP Snippet Preview.
55+ Free Browser-Based Tools for Developers, Writers & Teams
ToolCrux brings together the most commonly needed online utilities in one place — organized into 9 categories so you can find the right tool in seconds. Every tool runs directly in your browser without a login, without uploading your data, and without any rate limits for normal use.
Developer tools cover the full workflow: format and validate JSON, encode and decode Base64 and JWT tokens, test regular expressions, generate UUIDs, build QR codes, convert Unix timestamps, and more. Network tools let you run instant DNS lookups, WHOIS queries, SSL certificate checks, and HTTP header inspections without leaving your browser tab. Image tools compress, resize, and convert visuals client-side. PDF tools merge, split, and compress documents locally.
Tools can be chained into multi-step workflows — for example, convert a CSV to JSON and format it in one click, or decode a JWT and inspect the payload without copy-pasting between tabs. Shareable links let you send exact tool state to teammates or clients.
Frequently Asked Questions
Are all ToolCrux tools free?
Yes. Every tool is completely free with no signup required, no paywalls, and no usage caps for normal use.
Do the tools upload my data to a server?
Most tools run entirely in your browser — text, code, images, and files never leave your device. A small set of network tools (DNS Lookup, WHOIS, SSL Check, etc.) require a server-side request by nature, but no input data is logged or stored.
Can I chain tools together in a workflow?
Yes. The workflow system lets you chain tools in sequence. Output from one step flows directly into the next without copy-pasting. You can also share any workflow with a link so others can run it instantly.
Do I need to install anything?
No installation required. All tools run in any modern browser on desktop or mobile. ToolCrux also supports Progressive Web App (PWA) installation — add it to your home screen for quick access.
Which tools work offline?
All client-side tools work offline once the page has loaded. This includes JSON Formatter, Base64, Password Generator, Image Compressor, PDF tools, calculators, and all text tools. Network tools (DNS, WHOIS, SSL, etc.) require an internet connection.