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Formatters, decoders, generators, and testers for everyday development work — JSON, JWT, hashes, regex, UUIDs, and more. Everything runs in your browser, nothing is uploaded.
Clean up, count, compare, and transform text instantly. Word counts, case conversion, deduplication, and diff checking, all client-side.
Convert between common data formats like CSV and JSON without installing anything or uploading files to a server.
Small utilities for everyday SEO tasks, starting with clean, readable URL slugs.
Mortgage, loan, interest, and ROI calculators for everyday money decisions — no account, no data collection, just the math.
Generate strong passwords and check password strength, entirely on your device — nothing you type here is ever transmitted anywhere.
Small utilities for creators — hashtag generation, bio character limits, and pulling thumbnails from a YouTube link.
Merge PDFs entirely on your device using WebAssembly — files never leave your browser or touch a server. More PDF tools are on the way.
Compress and resize images right in your browser. No upload, no waiting on a server — your photos never leave your device.
Invoicing, expense tracking, and inventory for freelancers and small businesses — saved right in your browser, no account required.
BMI, calorie, macro, and pace calculators for everyday health and fitness questions — not medical advice, just the math.
GPA, statistics, and everyday math calculators for students and anyone who needs a quick, reliable answer.
Affordability, closing costs, and property calculators for buyers, renters, and landlords, alongside the mortgage tools in Finance.
Recipe scaling, oven temperature conversion, and baking ratios for the kitchen — quick math so you can get back to cooking.
Offer letters, PTO accrual, and overtime pay calculators for small businesses handling HR without a dedicated department.
Fuel cost, lease-vs-buy, depreciation, and commute calculators for everyday car ownership decisions.
Packing lists, jet lag, trip budgeting, and time zone references for planning a trip without the guesswork.
Paint, tile, mulch, concrete, and flooring calculators that turn room dimensions into exactly how much material to buy.
Subnet calculators, IP tools, and lookup references for everyday networking and sysadmin tasks.
Scrabble scoring, letter permutations, word search generators, and other utilities for word game and puzzle fans.
Physics and chemistry calculators — Ohm's law, molarity, projectile motion, and more — for students and hobbyists.
Audio format conversion and utilities for musicians and producers — MP3, WAV, and more, processed entirely in your browser.
Private by design
This tool runs in your browser whenever the work can be done there. Your input doesn’t leave your device unless a tool explicitly tells you otherwise before you use it.
Guides
Browse all guides →Longer reads that go beyond a single calculator — how-tos, comparisons, and roundups.
- Real EstateWhen Does Refinancing Actually Save You Money? The Break-Even Math
A lower rate isn't automatically a win once you count closing costs. Here's the one number that actually tells you whether refinancing is worth it.
- FinanceWhat Makes a Rental Property a Good Deal? Cap Rate, Cash Flow, and the Numbers That Matter
'It'll pay for itself' isn't a number. Here's how to actually evaluate a rental property before you buy it, using the same math real investors run.
- Home & DIYHome Renovation on a Budget: How to Estimate Material Costs Before You Start
Most renovation budgets blow up from underestimated materials, not surprise labor. Here's how to get real quantities before you buy anything.
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