What Is robots.txt? How to Write One, With Examples
robots.txt tells search crawlers which parts of a site they may visit. Learn the four rules, real examples, common mistakes and why it…
h/guides · How-to Guides
Step-by-step guides that go with our free tools.
What Is a URL Slug? How to Write a Good One
A URL slug is the readable end of a web address. Learn what makes a good slug, why hyphens beat underscores, how long it should be and how…
How to Round Numbers (Decimals and Sig Figs)
Learn how to round numbers the easy way: the 5-or-more rule, decimal places, tens and hundreds, significant figures, rounding money and why…
How to Rotate a Sideways or Upside-Down Video
Fix a sideways or upside-down video in seconds: which way to turn it, rotate vs flip, why some fixes do not stick, and how to rotate free…
How to Blur a Face or Number Plate in a Video
Hide a face, number plate, house number or date stamp in your own video before you share it. Blur vs pixelate vs solid box, the right…
How to Make a Slow-Motion Video From Any Clip
Slow a video to 0.5x or 0.25x, or speed it up to 2x or 4x, without chipmunk voices. The frame-rate maths, the new length and settings that…
How to Resize a Video for Reels, Shorts & TikTok
Turn a landscape or square video into a vertical 9:16 Reel, Short or TikTok without losing the picture. Sizes, blurred bars vs crop, and…
How to Extract Audio From a Video: MP3 Guide
Pull the sound out of any video you own and save it as MP3, M4A or WAV. Which format and bitrate to pick, how big the file will be, and…
How to Make a GIF From a Video: Size and FPS Tips
Turn any clip into a crisp, looping GIF: the best length, width and frame rate, why GIFs get so big, a quick size estimate, and when an MP4…
How to Calculate Video File Size: Bitrate Formula
Work out how big a video will be before you export it: the bitrate × time ÷ 8 formula, worked 720p, 1080p and 4K examples, and how to hit a…
How to Calculate PPF Maturity Amount: Formula + Examples
Work out your PPF maturity value by hand: yearly compounding at 7.1%, the 5th-of-the-month rule, worked examples for ₹12,000 to ₹1.5 lakh a…
Cheap Winter Holiday Flights: 12 Tips That Work
Planning to fly for Christmas, New Year or winter break? 12 practical tips to pay less: flexible dates, price alerts, nearby airports, bags…
eSIM vs Roaming: Which Is Better for Travel in 2026?
Travel eSIM, your carrier's roaming plan or a local SIM? How each works, which phones support eSIM, setup steps and how to avoid surprise…
How to Make a Photo Collage Free (No Watermark)
Make a clean photo collage in a minute: choose a layout, the right size for posts, stories or print, spacing and corners. Free, no app, no…
How to Remove Location from Photos (iPhone, Android)
Photos can hide your exact GPS location. How to check and remove it on iPhone, Android and computer, plus a free browser tool that strips…
How to Transcribe Audio to Text Free (No Upload)
Turn voice notes, lectures, interviews and videos into text for free with Whisper AI in your browser. Step-by-step, tips for accuracy and…
How to Watermark Photos Free (Text or Logo, Batch)
Add a text or logo watermark to photos for free: where to place it, best opacity and size, tiled vs corner marks, and how to watermark many…
How to Calculate Gold Jewellery Price (Making + GST)
Gold jewellery price = gold value + making charges + 3% GST. Step-by-step formula, worked examples, the 22K rate from 24K, old gold…
Is Refinancing Worth It? Refinance Break-Even Math
Divide refinance costs by your monthly savings to find the break-even month. Worked examples, the 30-year reset trap, and Canadian…
How to Count Days Between Two Dates (Easy Method)
Count the days between any two dates by hand or with a calculator. Learn when to include the end date, how leap years change the answer,…
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