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ToolShelf

All tools

All 93 tools, grouped by what they are for. Nothing here needs an account, and none of it costs anything.

Muslim tools

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Calculators and reference tools for prayer, fasting and zakat, each one showing the method it follows and the choices it leaves to you.

Calculators

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Percentages, changes and totals, worked out in one step and shown with the figures behind them.

Percentage calculator

Percentages, increases and reverse totals

15% of 24036

Finance & money

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Loans, compound growth, savings goals, discounts and margins. Each tool shows the formula it applied and names what it does not model.

Loan / EMI calculator

The monthly payment, and what it costs in total

$20,000 over 5 years at 7%$396.02 a month

Compound interest calculator

What a balance grows to, and how much of it is growth

$10,000 at 6% for 10 years$18,193.97

Savings goal calculator

How much a month, or how long it takes

$12,000 in 2 years$500 a month

Discount calculator

Sale prices, stacked offers and what you actually saved

30% off $80$56.00, saving $24.00

Profit margin calculator

Margin and markup, which are not the same thing

Cost $40, price $5020% margin, 25% markup

Date & time

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Ages, gaps between dates, shifting a date forward or back, hours between two times, and countdowns. All worked on the ordinary Gregorian calendar.

Age calculator

Your exact age, and when the next birthday lands

15 March 1994 to 1 January 202732 years, 9 months and 17 days

Date difference calculator

How long between two dates, counted several ways

1 Jan to 25 Dec 2026358 days, 256 working days

Date add / subtract calculator

A date shifted forward or back

1 Sep 2026 plus 90 days30 November 2026, a Monday

UK ILR absence checker

Every rolling 12 months, not just each year

150 days late one year, 150 early the next300 in one window, over the limit

Time duration calculator

Hours and minutes between two times

09:00 to 17:308h 30m, or 8.5 hours

Countdown calculator

Days, hours and seconds until a date you choose

Until 1 January 2027A Friday, counted to the second

Developer tools

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Formatting, encoding and decoding the things you paste between one window and another. All of it runs in your own browser, and nothing is uploaded.

JSON formatter & validator

Indent it, shrink it, or find out what is wrong with it

{"b":1,"a":[2,3]}Formatted, 2-space indent

Base64 encoder / decoder

Both directions, both alphabets, Unicode included

foobarZm9vYmFy

URL encoder / decoder

Percent-encoding, with the component and whole-URL rules apart

a b&c=da%20b%26c%3Dd

Robots.txt tester

See which rule a crawler actually applies

A Googlebot group beside a catch-allGooglebot ignores the catch-all

UUID generator

Version 4 and version 7, from your browser's own randomness

5 of version 4Fresh from crypto.getRandomValues

JWT decoder

Read the claims. It does not check the signature.

A three-part tokenHeader and claims, unverified

Text & writing

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Counting, cleaning, recasing and slugging a block of text. Every one is instant, and every one runs in your own browser.

Word counter

Words, sentences, paragraphs and how long it takes to read

A 500-word essayAbout 2 minutes to read

Character counter

With spaces, without, and what a character even is

A family emoji1 character or 11, depending

Case converter

Seven cases at once, no switching back and forth

hello world examplehelloWorldExample, hello-world-example

Text cleaner

Strip the spacing mess out of pasted text

Text pasted from a PDFSpacing collapsed, blanks gone

AI text paste cleaner

Strip the Markdown out of copied AI output

**Bold**, ## headings, [links](url)Plain text, ready to paste

PDF copy-paste text fixer

Rebuild paragraphs a PDF copy broke apart

Three pages copied from a reportWhole paragraphs, no page numbers

Slug generator

A clean URL slug, and honesty about what it drops

Crème brûlée & chips!creme-brulee-chips

Business & freelancing

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Setting a rate, pricing a job, splitting a commission and finding the point a business starts making money. Each tool shows the assumptions it ran on.

Hourly rate calculator

What to charge, once the unbillable hours are counted

$60,000 take-home, $6,000 costs, 20% tax$67.50 over 1,200 billable hours

Freelance project quote calculator

A fixed price from an hours estimate, with room to be wrong

40 hours at $75, 10% contingency, 20% margin$4,125.00

Commission calculator

Flat or tiered, before and after the split

$60,000 sale, 3% to $50,000 then 6%$2,100.00

Break-even calculator

How many you have to sell before anything is profit

$6,000 fixed costs, $40 price, $15 to make240 units a month

ROI calculator

The percentage, and the same percentage per year

$2,000 in, $2,600 back over 2 years30%, or 14.02% a year

Why are my emails going to spam?

Check what your domain tells mail servers

A domain with DMARC set to p=noneValid, and protecting nothing

COD true-profit calculator

What an order is worth before it is accepted

500 profit delivered, a quarter come back250 an order placed

Recipe and product costing calculator

What a batch costs, including your hours

A 2,500 batch of 12, at a 40% margin347.22 each

Image & file tools

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Compressing, resizing, converting and combining images, plus the arithmetic of file sizes. Every one runs in your own browser, and nothing is uploaded.

Image compressor

Fewer bytes, same picture, nothing uploaded

A 4 MB photo at 70% qualitySame dimensions, a fraction of the bytes

Image resizer

New dimensions, with the proportions kept

4000 × 3000 to 800 wide800 × 600

Image format converter

PNG, JPEG and WebP, whichever way round

A PNG screenshot to JPEGOne step, no upload

Image to PDF

Several pictures, one document, in order

Nine photos, in orderOne PDF, nine pages

PDF password remover

Take the password off a PDF you can already open

A statement whose password you knowThe same PDF, no password

Government form photo and signature maker

Exact pixels, exact kilobytes, in your browser

A 4 MB phone photo, 30 KB limit413 by 531, 29 KB

Subtitle two-point resync

Fix subtitles that drift, not just ones that are late

1 second out at the start, 40 at the endStretched 0.741%, both ends right

File size converter

Kilobytes twice over, and which one you meant

500 GB in gibibytes465.66 GiB

Everyday utilities

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Converting between the units people meet in ordinary life: centimetres and inches, kilograms and pounds, Celsius and Fahrenheit. Every figure is exact where the definition is.

Unit converter

Seven kinds of measurement, one page

1 US gallon in litres3.785411784 L

Temperature converter

Celsius, Fahrenheit and kelvin at once

100 °C in Fahrenheit212 °F

Length converter

Metric and imperial, plus feet and inches

180 cm in feet and inches5 ft 10.9 in

Weight converter

Kilograms, pounds, stone, and all three tons

70 kg in pounds154.3235835 lb

Speed converter

km/h, mph, knots, and the pace behind them

100 km/h in mph62.13711922 mph

Pakistan tools

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Tools built around rules that only apply in Pakistan: the 200-unit electricity threshold, what an instalment plan really costs, and what a freelance invoice is worth once it reaches a rupee account.

200-unit electricity guard

Whether this month crosses the protected limit

120 units, 15 days in, 15 to goOn course for 240 units

Instalment true-cost calculator

What a 0% markup plan actually costs

0% markup, plus a 5,000 processing fee10.01% a year

Freelancer take-home calculator

Invoice to rupees, with every deduction named

$1,000 invoiced, 12% in fees, 1% taxPKR 240,124.50

Pakistan property transfer cost calculator

Itemised, with each rate marked for where it came from

Rs 20m sale, Rs 12m valuation, filerRs 1.06m on top, 5.3% of the price

Solar net-billing payback calculator

How long a system takes to pay for itself

5 kW at 900,000, half used in daylight3.5 years to pay back