Free IT and Developer Tools Online
ToolMintX IT tools help developers, students, sysadmins, and support teams handle quick technical checks: JSON formatting, YAML conversion, Base64, hashes, JWT decoding, regex testing, cron expressions, DNS lookup, SSL checks, port scans, subnet math, password generation, and other daily utilities.
40 tools available in this category.
Available Tools
AI VRAM Calculator
Estimate GPU VRAM for LLM inference and training using model, quantization, users, and context length.
Client-sideAPI Key and .env Secret Generator
Generate secure .env secrets plus selectable Hugging Face, OpenAI, JWT, database, and webhook variables.
Client-sideSubnet Calculator
Free IP Subnet Calculator to instantly calculate network subnets, CIDR, broadcast addresses, and IP ranges online.
Client-sideIPv4 to IPv6 Converter
Instantly convert IPv4 addresses to IPv6 mapped and transition formats online for free.
Client-sideStrong Password Generator
Generate secure, random, and uncrackable passwords online with our free Strong Password Generator.
Client-sideWebcam and Mic Tester
Test your webcam preview, microphone signal, permissions, and input devices before calls or recordings.
Client-sideKeyboard Tester
Test Mac, Windows, laptop, compact, full-size, mechanical, USB, and Bluetooth keyboard keys online.
Client-sideSpeaker Tester
Test speakers, headphones, earbuds, and left-right stereo channels with local audio tones.
Client-sideScreen Tester
Check displays for dead pixels, color uniformity, gradients, contrast, and alignment grids.
Client-sideTouchpad Tester
Test touchpad movement, taps, clicks, double-clicks, scrolling, and pointer events online.
Client-sideGamepad Tester
Test controller buttons, analog sticks, triggers, D-pad inputs, axes, and gamepad mapping.
Client-sideBluetooth Device Checker
Check Web Bluetooth support, secure context status, availability, and device chooser behavior.
Client-sideBrowser Feature Tester
Check support for camera, mic, clipboard, WebGL, WebRTC, Bluetooth, storage, and browser APIs.
Client-sideInternet Speed Lite Test
Run a quick ping, download, upload, and browser network information speed estimate.
WebRTC Leak Test
Check WebRTC ICE candidates for public, local, relay, host, srflx, and mDNS exposure.
Clipboard Tester
Test browser clipboard copy, paste, read, write, permissions, and secure context support.
Client-sideCHMOD Calculator
Free visual CHMOD calculator to instantly generate Linux and Unix file permissions.
Client-sideMAC Address Lookup
Free MAC Address Vendor Lookup tool. Instantly find the manufacturer of any networked device using its OUI.
Client-sideJSON Formatter & Validator
Free JSON Formatter to beautify, parse, and validate JSON data instantly online.
Client-sideYAML to JSON Converter
Convert YAML to JSON and JSON to YAML instantly with this free online developer tool.
Client-sideBase64 Encoder / Decoder
Free Base64 Encoder and Decoder online to safely encode text and data strings.
Client-sideRegex Tester
Free online Regex Tester to build, test, and debug regular expressions instantly.
Client-sideHash Generator
Generate secure SHA-1, SHA-256, and SHA-512 hashes instantly from any text.
Client-sideJWT Decoder
Decode JSON Web Tokens (JWT) safely to view their header and payload claims.
Client-sideCron Job Generator
Visual Cron expression generator and parser for Linux and Unix scheduling.
Client-sidePing Test
Ping any hostname or IP address online. Check server reachability and response time.
Port Scanner
Scan common TCP ports on any IP address or domain name instantly. Check your firewall security.
DNS Lookup
Perform an advanced DNS lookup to check A, AAAA, MX, NS, CNAME, and TXT records.
SSL Checker
Check the validity, expiration date, and issuer of any SSL/TLS certificate online.
Telegram Chat ID Extractor
Find your Telegram Chat ID, Group ID, or Channel ID instantly using your Bot Token.
Client-sideLAN Cable Color Coder
Generate RJ45 color codes and learn how to patch Ethernet cables.
Client-sideUUID Generator
Generate cryptographically secure UUID v4 identifiers. Single or bulk generation.
Client-sideURL Encoder / Decoder
Encode or decode URLs and query strings with percent-encoding instantly.
Client-sideUnix Timestamp Converter
Convert Unix/Epoch timestamps to dates and dates to timestamps with timezone support.
Client-sideDiff Checker
Compare two texts side by side and find differences highlighted line by line.
Client-sideCSV to JSON Converter
Convert CSV data to JSON and JSON arrays back to CSV with quoted field support.
Client-sideHTML Entity Encoder / Decoder
Encode special characters to HTML entities or decode entities back to text.
Client-sideSQL Formatter
Format and beautify messy SQL queries with proper indentation and keyword capitalization.
Client-sideHTTP Status Codes
Complete searchable reference for all HTTP status codes with descriptions.
Client-sideWhat's My IP
Check your public IP address, location, ISP, browser, and system info instantly.
Client-sideWhat This Category Helps With
The category separates client-side formatting tools from network diagnostic tools. Formatters, encoders, hash generators, JWT viewers, and password utilities are built for quick local tasks; network tools use server routes where a browser cannot perform the check directly.
Each tool focuses on a specific technical question: Is this JSON valid? What does this JWT payload contain? What subnet range does this CIDR represent? Which DNS records are visible? When will this cron expression run?
The pages are designed to be readable during troubleshooting. Inputs, output panels, copy buttons, and error messages are kept close together so a user can verify a result and move back to their actual work.
Common Uses
- Beautify JSON before debugging an API response.
- Decode a JWT header and payload without sending it to a login system.
- Generate a strong random password using browser crypto.
- Check DNS, SSL, ping, or port behavior from a server-side route.
- Convert Base64, YAML, timestamps, URLs, UUIDs, or file permissions.
How to Choose the Right IT Tools
Start with the job you need to finish, not the tool name. If the task is narrow, open the closest matching tool and use its built-in notes to check the result before downloading, copying, or sharing anything.
In this category, the best results usually come from clean input, a clear target format, and one final review in the place where the output will be used. That review matters because a file, calculation, caption, or code snippet can look correct on the page but still need a small adjustment for a form, editor, device, or platform.
AI VRAM Calculator
Estimate GPU VRAM for LLM inference and training using model, quantization, users, and context length. Use it when that workflow matches your goal: Accurately estimate GPU memory requirements for popular AI models across inference and training workloads. Choose your model preset, quantization format, context length, and concurrent users to get a transparent VRAM breakdown for weights, KV cache, optimizer states, and activations. Includes full fine-tuning and QLoRA estimation modes.
API Key and .env Secret Generator
Generate secure .env secrets plus selectable Hugging Face, OpenAI, JWT, database, and webhook variables. Use it when that workflow matches your goal: Create strong local development secrets for OpenAI-compatible API endpoints, selectable Hugging Face, OpenAI, Anthropic, Gemini, OpenRouter, Groq, Mistral, Azure OpenAI provider variables, JWT signing, NextAuth, sessions, database passwords, DATABASE_URL values, webhooks, cron jobs, and internal APIs. Local secrets are generated with the browser Web Crypto API and official provider keys are shown as clear dashboard placeholders.
Subnet Calculator
Free IP Subnet Calculator to instantly calculate network subnets, CIDR, broadcast addresses, and IP ranges online. Use it when that workflow matches your goal: The best free IPv4 Subnet Calculator for network engineers and IT professionals in 2026. Enter an IP address and CIDR notation (or subnet mask) to instantly calculate the network address, broadcast address, total usable hosts, and the complete IP range. All calculations are performed instantly and securely in your browser with zero server uploads. Perfect for CCNA students, sysadmins, and network architects planning IP allocations.
IPv4 to IPv6 Converter
Instantly convert IPv4 addresses to IPv6 mapped and transition formats online for free. Use it when that workflow matches your goal: Easily convert standard IPv4 addresses into various IPv6 transition formats instantly. Get accurate IPv4-mapped (::ffff:), IPv4-compatible, 6to4 prefix (2002:), and ISATAP representations in one click. This free network tool helps network administrators, developers, and IT teams work seamlessly with dual-stack environments and modern IPv6 transition mechanisms. 100% fast, secure, and client-side processing.
Strong Password Generator
Generate secure, random, and uncrackable passwords online with our free Strong Password Generator. Use it when that workflow matches your goal: Create highly secure, cryptographically strong random passwords to protect your accounts from hackers in 2026. Customize the password length up to 128 characters and choose which character sets to include (uppercase, lowercase, numbers, and symbols). Generated using the secure Web Crypto API, your passwords are created locally in your browser and are never sent, stored, or tracked on any server. 100% private and safe.
Webcam and Mic Tester
Test your webcam preview, microphone signal, permissions, and input devices before calls or recordings. Use it when that workflow matches your goal: Check whether your camera and microphone work before video calls, online classes, remote interviews, livestreams, podcasts, or screen recordings. Preview the selected webcam, watch a live microphone level meter, switch input devices, review camera and audio track details, and stop the browser tracks when finished.
Suggested Workflow
For a quick start, compare the first few tools in this category by outcome. AI VRAM Calculator helps when your goal is estimate GPU VRAM for LLM inference and training using model, quantization, users, and context length. API Key and .env Secret Generator helps when your goal is generate secure .env secrets plus selectable Hugging Face, OpenAI, JWT, database, and webhook variables. Subnet Calculator helps when your goal is free IP Subnet Calculator to instantly calculate network subnets, CIDR, broadcast addresses, and IP ranges online.
After choosing a tool, complete the task once with a small sample if possible. This gives you a chance to confirm settings, understand the output, and avoid repeating the same mistake across multiple files, messages, calculations, or assets.
Privacy and Processing
Many IT utilities run locally in the browser, but network diagnostics such as ping, port scan, DNS lookup, SSL checking, and MAC vendor lookup may call ToolMintX API routes because they need server-side networking or lookup behavior. Avoid pasting production secrets into any online utility.
Category FAQ
Which IT tools are fully client-side?
Text and data utilities such as formatters, encoders, decoders, hash generators, UUID generation, and password generation generally run in the browser. Network checks use server routes when required.
Can I paste secrets into these tools?
Avoid entering production passwords, private keys, access tokens, or customer data into any web utility. For sensitive debugging, use local tools inside your own environment.
Why do ping and port tools need an API route?
Browsers cannot perform raw network diagnostics directly, so those checks must run through a controlled backend route.
Are results guaranteed to match my own machine?
Not always. Server-side diagnostics reflect the ToolMintX server network path, while browser-side tools reflect your local input and browser behavior.