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Practical guides for real tasks — written by the people building the tools on this site.
Showing 2,437–2,457 of 2,474 articles
🔀 Data & CSV
Convert an HTML Table Into a CSV File
Convert HTML table markup into a CSV file, ready to copy or download, without opening a spreadsheet app or writing a scraper. Free and browser-based.
🔤 Text & Writing
How to Convert Text Case Without Retyping Everything
Switch between UPPERCASE, Title Case, camelCase, and more without manually fixing every letter. What each case style is actually for, and how to convert instantly.
🔀 Data & CSV
Convert XML to JSON Without Writing a Parser
Convert XML into clean JSON live as you type, with attributes, nested elements, and repeated tags handled automatically. Free and runs in your browser.
📅 Date & Time
Count Down the Days Until Your Birthday
See a live, second-by-second countdown to your next birthday showing days, hours, minutes, and seconds remaining. Free and runs right in your browser.
🔒 Security & Privacy
How to Encrypt and Decrypt Text With a Vigenère Cipher
Learn how the Vigenère cipher's keyword-based shifting works and how to encrypt or decrypt text with it for classes, puzzles, or classic cryptography practice.
🔍 SEO & Web
How to Extract Every URL From an XML Sitemap
Pull every URL out of a pasted XML sitemap or sitemap index into a clean list, with a count and text-file download, entirely in your browser.
🎧 Video & Audio
How to Extract MP3 Audio From a Video File
Pull the audio track out of an MP4 or MOV and save it as an MP3 without installing an editor. What actually happens during extraction and how to do it in your browser.
🎲 Generators
How to Find a Gift Idea When You're Stuck
Get a gift idea filtered by interest and budget for any recipient, when you're out of ideas and running out of time before the occasion.
📅 Date & Time
Find the Moon Phase for Any Date
Calculate the moon phase, cycle age, and approximate illumination percentage for any date, past or future, without an astronomy app. Free and instant.
💻 Developer Tools
How to Clean Up Minified or Messy CSS Fast
Reformat minified or messy CSS into clean, consistently indented stylesheets that preserve comments, live as you type, without installing a build tool.
🎲 Generators
How to Generate a Random Excuse for Fun
Get a random, category-filtered excuse for work, school, or social plans, for games, icebreakers, or a laugh — not for actually skipping anything.
🎲 Generators
How to Generate a Secure Random PIN
Create random numeric PINs of any length, in batches, with an optional no-repeated-digits mode, for accounts, devices, and shared codes.
💻 Developer Tools
How to Generate an HMAC Signature Online
Compute HMAC-SHA1, SHA256, SHA384, or SHA512 signatures from a message and secret key using the Web Crypto API, output in hex or Base64, in your browser.
🔒 Security & Privacy
How to Generate an RSA Key Pair in Your Browser
Generate a 2048 to 4096-bit RSA public/private key pair in PEM format for signing or encryption, entirely in your browser with the Web Crypto API.
🎲 Generators
How to Generate Fake Test Data for Your App
Generate rows of fake names, emails, phone numbers, and companies as CSV or JSON for testing forms, seeding a database, or building a demo.
🔍 SEO & Web
How to Generate JSON-LD Schema Markup Without a Developer
Generate valid JSON-LD structured data for Article, FAQPage, and Product schema by filling in a form, live, with no developer needed and nothing uploaded.
💻 Developer Tools
How to Generate SEO and Social Meta Tags Fast
Generate title, description, robots, canonical, Open Graph, and Twitter Card meta tags ready to paste into your page head, without memorizing the syntax.
🎲 Generators
How to Get Random Sentences for Typing Practice
Generate random, grammatically complete English sentences for typing drills, writing prompts, or language practice, with fresh sentences every time.
🎲 Generators
How to Get Test Credit Card Numbers for Testing
Generate Luhn-valid, non-real credit card numbers by network to test payment forms and checkout flows without risking a real card.
🔒 Security & Privacy
How to Grade Security Headers and Spot the WAF Behind Them
Paste a site's response headers to get a security header grade and identify the WAF or CDN provider protecting it, entirely in your browser.
📅 Date & Time
Make a Printable Calendar for Any Month
Generate a printable monthly calendar for any month and year, with a Monday- or Sunday-first week and today highlighted. Free, no design software needed.