27 calculators
Technology and developer tools
Developer tools stay in the browser: encode URLs, format JSON, build UTM links, inspect CIDR ranges, and convert colors. This cluster is for quick checks while you ship, without pasting secrets into a third-party form.
Explore this cluster
Password Generator
Generate secure, random passwords with customizable length and character options
Base64 Encoder
Encode text to Base64 format for secure data transmission
Base64 Decoder
Decode Base64 encoded text back to original format
JSON Formatter
Format and beautify messy JSON code with proper indentation
Aspect Ratio Calculator
Calculate aspect ratio from width and height dimensions (16:9, 4:3, etc.)
Hex to RGB Converter
Convert hexadecimal color codes to RGB values
RGB to Hex Converter
Convert RGB color values to hexadecimal color code
Engagement Rate Calculator
Calculate engagement rate for Instagram, TikTok, or YouTube.
Video File Size Calculator
Estimate video file size based on resolution, duration, and fps.
TikTok Money Calculator
Estimate potential earnings from the TikTok Creator Fund.
SEO Title & Meta Description Counter
Check if your title and description length are optimal for Google.
Contrast Ratio Checker
Check WCAG compliance for text contrast between foreground and background colors
Download Time Calculator
Calculate how long it will take to download a file based on file size and internet speed
Pixels to REM Converter
Convert pixel values to REM units for responsive web design
Password Entropy Calculator
Calculate password strength and entropy in bits
AI Token Cost Calculator
Calculate the cost of using AI models like GPT-4, Claude, and Gemini based on input and output tokens. Compare pricing across different AI providers.
AI Image Upscale Ratio Calculator
Calculate pixel dimensions, quality loss, and file size changes when upscaling images. Compare different upscaling methods including AI-powered solutions.
UUID Generator
Generate one or many random UUID v4 identifiers in your browser.
URL Encoder
Encode or decode URL components and query values.
Timestamp Converter
Convert Unix seconds, milliseconds, and ISO dates.
Slug Generator
Turn a title into a clean lowercase URL slug.
Case Converter
Switch text among upper, lower, title, sentence, camel, snake, and kebab case.
HTML Encoder
Escape HTML special characters or turn entities back into text.
Chmod Calculator
Build Unix file permissions and copy octal, symbolic, and chmod output.
CIDR Calculator
Calculate IPv4 network range, subnet mask, broadcast address, and host count.
UTM Link Builder
Build an encoded campaign URL from source, medium, campaign, and content.
Screen PPI Calculator
Calculate pixel density, pixel pitch, and aspect ratio.
Related guides
Check meta description length before you publish
Count title and meta description characters before the page goes live. 50–60 title, 150–160 description.
SEO title length checker before you hit publish
Stay near 50–60 characters. Put the query first so the truncated version still makes sense.
Title vs meta description length before you publish
Two different caps: ~60 for the title, ~160 for the description. Count both on one screen.
Clean the URL slug before you publish
Turn the title into a lowercase slug, then check title length. Two steps before the page is live.
Boost Your Social: How to Calculate and Improve Engagement Rates
Stop guessing your social media success. Learn the formulas for Instagram and YouTube engagement rates and why they matter more than follower count.
Video Quality vs. File Size: A Content Creator's Guide
Bitrate, resolution, and codecs explained. How to estimate video file sizes before you start rendering.
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