Tech Tools Calculators & Tools
IP lookup, password generator, QR code, bandwidth, PPI calculators and tech utilities.
These are handy technology utilities for everyday digital tasks, from generating a strong password to making a QR code or checking screen sharpness. Each tool is simple, fast, and focused on one job.
Accessible Color Pair Finder
Check if a text/background pair meets WCAG and suggest a fix. Free tool with instant calculations, the underlying formula, and an easy-to-follow example.
AI API Cost Calculator
Estimate LLM API cost from input/output tokens and per-token prices.
Download Time Calculator
Estimate how long a file takes to download at a given connection speed.
Barcode Generator
Generate Code 128 / EAN barcodes from your data.
Browser Info Detector
Show details about your browser, OS and screen.
CDN & Cache Header Guide
Understand which CDN serves a site from its response headers.
Color Blindness Simulator
See how a color appears to people with common color-vision deficiencies.
Color Converter (HEX / RGB / HSL)
Convert colors between HEX, RGB and HSL formats.
Color Namer
Find the closest named CSS color to any HEX value.
Color Palette Generator
Generate a harmonious color palette from one base color.
Color Picker
Pick a color and get its HEX, RGB and HSL values.
Color Temperature to RGB Calculator
Convert a Kelvin color temperature to an approximate RGB color.
Color Contrast Checker (WCAG)
Check the WCAG contrast ratio between a text and background color.
CSS Unit Converter (px / rem / em)
Convert between px, rem, em and pt using a root font size.
DNS Lookup Tool
Look up DNS records for a domain using DNS-over-HTTPS.
Embedding Cost Calculator
Estimate the cost of generating text embeddings at scale.
Text Encoder / Decoder
Encode or decode Base64, URL and HTML entities.
Favicon URL Builder
Build the standard favicon HTML tags for your site.
Text Favicon Generator
Create a simple letter favicon as a downloadable PNG.
File Size Converter
Convert between bytes, KB, MB, GB and TB (binary and decimal).
Font Pairing Suggester
Get a complementary font pairing for a chosen heading style.
CSS Gradient Generator
Generate CSS linear-gradient code from two colors and an angle.
Radial Gradient Generator
Generate CSS radial-gradient code with a live preview.
CSS Grid Generator
Generate CSS Grid layout code from columns, rows and gap.
Image Color Palette Extractor
Extract dominant colors from an image you upload.
LLM Context Window Visualizer
Break down how system, history and response tokens fill a context window.
Pixel / Point / DPI Converter
Convert pixels to physical size at a given DPI, and back.
PPI (Pixel Density) Calculator
Calculate pixels per inch from resolution and screen diagonal.
Prompt Token Simulator
See how a prompt's tokens fit within a model's context window.
QR Code Generator
Generate a QR code from any text or URL, downloadable as PNG.
Screen Resolution Detector
Detect your screen resolution, viewport size and pixel ratio.
Mobile Safe Area Calculator
Calculate usable content area after notches and home indicators.
Subnet Calculator (IPv4)
Calculate network, broadcast, host range and host count from CIDR.
Token Counter
Estimate the number of LLM tokens in a block of text.
Typographic Scale Calculator
Generate a modular type scale from a base size and ratio.
User Agent Parser
Parse a user-agent string into browser, OS and device.
Viewport Size Detector
Show your browser viewport dimensions and update live on resize.
Device Viewport Tester
Look up the CSS viewport size for common devices.
WebP / AVIF Support Checker
Detect whether your browser supports modern image formats.
How to choose the right Tech Tools tool
- Need security? Use the password generator for a strong, random result.
- Sharing a link or contact? The QR code tool turns it into a scannable image.
- Comparing screens? The PPI calculator measures pixel density.
- Pick the tool that matches your task; each one is self-contained.
Who these tools are for
For everyday users, students, and tech-curious people who want quick utilities in one place.
Need Help Solving a Problem?
Our AI Math Solver handles any math problem, just type it in plain English and get instant step-by-step solutions.
Explore Other Categories
Popular tools from our other scientific categories
Absolute Value Calculator
Calculate the absolute value of any number. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
AC to DC Converter Calculator
Convert AC voltage to DC voltage for different rectifier configurations. Free online calculator with instant, step-by-step results.
Acid-Base Titration Calculator
Calculate concentration from titration data. Get quick, accurate results with this free online calculator, including formulas and worked examples.
ABV Calculator
Calculate alcohol by volume from original and final gravity. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Amortization Schedule Calculator - Free Online
Free Generate a complete amortization schedule. Step-by-step solutions and formulas included. Free, accurate results with step-by-step explanations.
Average Cost Basis Calculator - Free Online
Free Calculate average cost per share. Step-by-step solutions and formulas included. Fast, accurate, and free, with formula and example.
1031 Exchange Calculator - Free Online
Free Calculate tax deferral in a 1031 exchange. Step-by-step solutions and formulas included. Fast, accurate, and free, with formula and example.
A1C Calculator - Free Online
Free Convert between A1C percentage and estimated average glucose. Step-by-step solutions and formulas included. Simple, fast, and free.
Batting Average Calculator
Calculate batting average in baseball/cricket. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Air Density Calculator
Calculate air density from temperature and pressure using the ideal gas law. Fast, accurate, and free, with formula and example.
Age Calculator
Calculate exact age in years, months, and days. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
Acceleration Converter
Convert between acceleration units. Get quick, accurate results with this free online converter, including formulas and worked examples.
Circle Area Calculator
Calculate the area and circumference of a circle. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Angle Between Two Lines Calculator
Calculate the angle between two lines given their slopes. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Apache Log Parser, Free Online Developer Tool
Parse Apache/NGINX combined access log lines into IP, time, request, status and size fields. Get instant results, the formula, and a clear example.
Add Text to Beginning, Free Online Text Tool
Add custom text to the beginning of every line in your text instantly. Get instant results, the formula, and a clear example.