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Practical guides for real tasks — written by the people building the tools on this site.
Showing 1,660–1,680 of 2,464 articles
⚖️ Health & Fitness
How to Calculate Weight Loss Percentage
Use a weight loss percentage calculator to track body weight lost, goal progress, weekly rate, and 5% or 10% milestones.
📊 Education
How to Calculate Your Course Grade From Weighted Categories
Calculate your overall course grade from custom weighted categories like homework, exams, and participation, with a warning if weights don't total 100%.
✍️ Text & Writing
How to Catch Grammar Mistakes Before You Hit Send
Check your writing for common grammar mistakes, misspellings, and wordy or passive-voice style issues, with plain-English explanations, entirely in your browser.
🔒 Security & Privacy
How to Check a Domain's SSL Certificate Details
Look up a domain's SSL/TLS certificate issuer, validity dates, protocol version, and covered hostnames in a clean, readable summary, without command-line tools.
📷 Image Tools
How to Check a Photo's Hidden EXIF and GPS Data
Read the camera make, exposure settings, capture date, and GPS coordinates hidden in a JPEG's EXIF metadata before you post or share the photo publicly.
📈 Finance Calculators
How to Check a Trade's Risk-Reward Ratio Before Entering
Calculate the risk-reward ratio for a long or short trade from your entry, stop loss, and take profit levels, before you commit real capital to the setup.
💻 SEO & Web
How to Check AMP HTML Before Publishing
Use an AMP validator to check required head markup, CSS budget, disallowed tags, inline styles, and missing extension scripts.
🔒 Security & Privacy
How to Check Email Blacklist Lookups
Use an email blacklist check to build DNSBL queries for a mail server IP, with dig/nslookup commands and return-code meanings.
📝 Text & Writing
How to Check Haiku Syllables
Use a haiku checker to count syllables per line for 5-7-5 or 3-5-3 poems, with editable per-word syllable counts.
🔢 Math & Science
How to Check if a Number Is Prime
Check whether a number is prime, see its smallest factor if not, and list the five nearest primes below and above it, instantly in your browser.
🔁 Text & Writing
How to Check if a Phrase Is a Palindrome
Check whether a word or phrase is a palindrome, ignoring spaces, punctuation, and case, and see the cleaned and reversed text side by side to verify it.
📡 Network Tools
How to Check If a Website Is Actually Down
Preview how a website status report would look, with domain validation and a clear result layout, entirely in your browser.
📄 Developer Tools
How to Check If XML Is Well-Formed and Format It Cleanly
Paste XML to check it is well-formed and reformat it with consistent indentation, live as you type, entirely in your browser.
📲 SEO & Web
How to Check If Your Site Meets Core PWA Requirements
Check a site against core PWA installability requirements - manifest, service worker, HTTPS, and icons - with an example result shown, before users try to install it.
🔍 SEO & Web
How to Check On-Page SEO Fundamentals Fast
Paste a page's HTML source to check title length, meta description, heading structure, image alt text, and word count against SEO fundamentals at once.
📝 Text & Writing
How to Check Text Readability
Use a readability checker to score text with Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI.
🎨 SEO & Web
How to Check WCAG Color Contrast
Use an accessibility contrast checker to test WCAG AA and AAA text contrast, font-size thresholds, and nearest passing colors.
🔒 Security & Privacy
How to Check What Type of IP Address You Have
Validate an IP address's format and identify whether it's public, private, or reserved, with an honest explanation of how real blacklist checks work.
📷 Video & Audio
How to Check Your Webcam Before a Video Call
Test your webcam right in your browser — see a live preview, resolution, and frame rate, and switch between connected cameras, without recording or uploading anything.
🕐 Date & Time
How to Compare Times Across Cities Without the Math
Convert a date and time into ten major world cities at once, using accurate daylight saving handling, instead of manually adding and subtracting UTC offsets.
📑 SEO & Web
How to Compare Two Pieces of Text Side by Side
Compare word count, sentence length, and unique vocabulary between two pieces of text - useful for content SEO gap checks and editorial comparisons.