Blog
Guides, tips, and tutorials for our tools
How Many kWh Solar Battery Do You Need for Your Home?
Work out how many kWh of solar battery your home needs: size for essentials first, avoid the nominal-capacity trap, and check it with a free calculator.
How to Remove Duplicate Lines Without Breaking Order
Clean email, keyword or log lists in seconds: remove duplicate lines, keep the original order, and avoid the case and spacing traps that ruin imports.
How to Remove Metadata from a PDF (Free, No Upload)
Your PDF quietly carries your name, software, and edit history. Strip PDF metadata free in seconds: no signup, nothing uploaded, content untouched.
Car Loan EMI Explained: Down Payment vs Tenure Trade-offs
Car loan EMI explained with real numbers: how down payment and tenure change your EMI, total interest, and the true cost of the loan.
How to Compress a PDF Under 200KB for Job Applications (Without Making It Look Awful)
Job portal rejecting your PDF for being over 200KB? Here is how to compress a PDF under the limit without making it look unprofessional.
Flat Rate vs Reducing Balance: The Interest Trick Lenders Use
Flat rate vs reducing balance: why an 8% loan can cost more than a 14% one, with a worked example and the questions to ask your lender.
Turning Your Salary Into a Freelance Hourly Rate
Turn your salary into a freelance hourly rate that covers holidays, admin and costs, with a worked example and the billable-hours maths.
iPhone Photos Won't Upload? Convert HEIC to JPG
iPhone photo will not upload to a form? It is probably HEIC. Here is how to convert HEIC to JPG free, on any device, in under a minute.
JPG vs PNG vs WebP: Which Image Format to Actually Use
JPG vs PNG vs WebP: which image format to use for photos, logos, screenshots and websites, and how to convert between them free.
Merging Mark Sheets and Certificates Into One PDF for Visa Applications
How to merge mark sheets and certificates into one clean PDF for visa applications: order, file size, and mistakes to avoid.
Passport Photo at Home: Size, Background and Format Requirements
Take a passport photo at home that passes: exact pixel sizes, background and lighting rules, plus free tools to crop and resize it.
Free QR Codes for Your Shop, Menu or WiFi
Free QR codes for your shop, menu or WiFi: how to create them in minutes, where to place them, and mistakes that stop scans.
How to Reduce Photo Size for Online Admission Forms (20KB, 50KB, 100KB Limits)
Admission form rejecting your photo for size? How to reduce a photo to 20KB, 50KB or 100KB exactly, and keep your face clear.
Removing Backgrounds for Product Photos When Selling Online
Cleaner product photos sell more. How to remove backgrounds from product photos free: white, transparent, and tricky items.
Signature Images for Online Forms: Size, Format and Background Guide
Online form rejecting your signature? The right size, format and background for signature images, fixed in under two minutes.
How Much to Invest Monthly to Reach $1 Million
How much do you need to invest monthly to reach $1 million? Real figures for 15, 20, 25 and 30 years, plus the mistakes that slow you down.
Word Counts That Matter: Assignments, Gigs and SEO
Word counts that matter for assignments, freelance gigs and SEO: the usual limits, and how to hit them without padding.
How Much House Can I Afford on a $100,000 Salary?
On $100,000 a year, the 28/36 rule points to a home of about $300,000 with $40,000 down at 7.4%. See how debts, down payment and rates change it.
UK Mortgage Overpayments: How Much Interest You Save
Overpaying £200 a month on a £200,000 mortgage at 4.5% saves £36,280 of interest and 6 years. See monthly and lump-sum tables, and the 10% rule.
How to Write an Invoice (US & UK): What It Must Include
What an invoice must show in the UK and US, the extra details on a VAT invoice, how to number invoices, add tax and discounts, and set payment terms, with a worked example.
How to Write a Cover Letter: US vs UK Format (with Example)
How to structure a cover letter that gets read, the differences between US and UK cover letters, a full example, and the mistakes to avoid.
$75,000 After Taxes: Take-Home Pay by State (2026)
What a $75,000 salary takes home in 2026 in every US state after federal tax, Social Security, Medicare and state income tax, plus $50,000 to $150,000 compared.
Rent vs Buy: When Does Buying Beat Renting? (US & UK)
How long you need to stay for buying a home to beat renting, with worked US and UK examples and what changes the answer: prices, rent, rates and returns.
UK Take-Home Pay 2026/27: Salary After Tax, £20k to £150k
What you take home from a UK salary in the 2026/27 tax year after income tax and National Insurance, from £20,000 to £150,000, for England, Wales, NI and Scotland.
Debt Snowball vs Avalanche: Which Pays Off Debt Faster?
How the debt snowball and debt avalanche methods work, worked examples showing the interest and time each saves, and how to choose, with a free payoff calculator.
US Résumé vs UK CV: The Differences, With Templates
How a US résumé and a UK CV differ in length, paper size, personal details, photos, spelling and sections, with a side-by-side table and free ATS-friendly templates.
Is Solar Worth It? Payback by US State and UK Region
How long solar panels take to pay for themselves in all 50 US states, DC and 7 UK regions, from 2026 electricity prices, installed costs and modelled sunshine.
ATS-Friendly CV: Format, Keywords and a Free Template
How applicant tracking systems read your CV, the format that gets read correctly, how to match job-ad keywords, and a free ATS CV builder with templates.
How to Reduce PDF Size to 100 KB, 200 KB or 1 MB
Upload rejected for being too big? Shrink a PDF under 100 KB, 200 KB or 1 MB for job, admission and visa forms: free, in your browser, no upload.
How to Calculate Bricks for a Wall
Learn the exact formula for calculating how many bricks you need for any wall, including mortar and wastage allowance.
Solar Panel Sizing: How Many Panels Do You Need?
A complete guide to calculating the right solar panel capacity for your home or off-grid system based on your energy consumption.
Trigonometry Made Simple: sin, cos, tan Explained
A beginner-friendly guide to understanding sine, cosine, and tangent with practical examples and a reference table.
How to Calculate Your Monthly Electricity Bill
Learn how to estimate your electricity bill by adding up appliance wattages and daily usage hours.
Construction Material Cost Estimation Guide
A practical guide to estimating material costs for construction projects, from foundation to finishing.