550+ free online tools for everyday work

A photo gets heavy for two reasons: it has too many pixels, or it is saved with too much detail for the screen it will be seen on. A phone camera takes 4000 pixels across, but a website or chat app shows it at under 1200. Shrinking the pixel size first usually saves more than any slider, and the eye cannot tell the difference.

After that, lower the quality setting slowly. For most photos, quality around 70 to 80 percent looks the same as the original at normal viewing size but can be a fraction of the file size. Stop as soon as you see blocky patches in the sky or around text. Because Toolcloak works inside your browser, the photo never leaves your phone while you try different settings.

JPG is best for photographs. It throws away detail the eye does not notice, so files stay small. PNG keeps every pixel exactly, which makes it the right choice for screenshots, logos and anything with sharp text or a transparent background, but photos saved as PNG are often five times larger than they need to be.

WEBP is a newer format that is usually 25 to 35 percent smaller than JPG at similar quality, and it supports transparency like PNG. Almost every current browser and phone can open it. If you are posting to a website, WEBP is a good default. If you are emailing a file to someone who may open it in older software, JPG is the safe choice.

Put the files in the order you want the pages to appear, then join them in a single step. The most common use is sending one tidy file for a job application, a loan form or a visa: ID proof, address proof and a covering letter in one document instead of five attachments.

Before you merge, check the page orientation of each file, because a landscape page in the middle of a portrait document looks odd. After merging, open the result and scroll through it once. If the final file is too large to email, run it through a PDF compressor as a last step.

Nearly all of a PDF’s weight comes from images inside it. A scanned page is really a photograph of a page, so a ten page scan can easily pass 20 MB. Text, by contrast, is tiny. Compression works by re-saving those images at a lower resolution, which is why a scanned document shrinks a lot and a text-only document barely changes.

Government portals and email services often cap uploads at 1 or 2 MB. Aim for the smallest size that is still comfortable to read on screen, and zoom in on a signature or a small number to confirm it is still clear before you upload.

Yes, and it is the standard way to submit paperwork that you only have as photos. Take each page flat and in good light, crop the edges so the page fills the frame, and put the pictures in reading order before converting. One PDF with page numbers is much easier for the person receiving it than a folder of loose photos.

If the photos came out dark or tilted, fix that before converting. A tilted page is hard to read and makes a document look careless, while a straight, bright scan looks professional even when it was taken on a phone.

OCR, short for optical character recognition, looks at the shapes in a picture and turns them into editable letters. It works best on clear, straight, high-contrast text, such as a printed page or a screenshot, and it struggles with handwriting, curved pages and low light.

To get better results, crop to only the text, make the image sharp and well lit, and avoid shadows across the page. Always read the output once. OCR confuses lookalikes such as the letter O and the digit 0, so check names, numbers and email addresses before you rely on them.

An EMI, or equated monthly instalment, is a fixed payment that covers both interest and a slice of the original loan. It depends on three things: the amount borrowed, the yearly interest rate and the number of months. The monthly rate is the yearly rate divided by twelve, and the formula spreads the repayment so every instalment is the same size.

In the early years most of each EMI is interest, and only a small part reduces what you owe. That is why paying a lump sum early in the loan saves far more than paying the same amount near the end. A longer tenure lowers the EMI but raises the total interest, so look at the total payable, not just the monthly figure.

A systematic investment plan puts a fixed amount into a fund on a fixed date every month. Because you buy every month, you purchase more units when prices are low and fewer when they are high, which smooths out the price you pay on average over time.

A calculator can show what regular investing might become at an assumed yearly return. Treat the result as an illustration, not a promise, because real markets move up and down. The two things you control are how much you invest and for how long. Time matters more than most people expect: the extra years at the end are where compounding does its heaviest work.

To add GST, multiply the price by the rate and add the result: at 18 percent, a price of 1,000 becomes 1,180. To take GST out of a price that already includes it, divide by 1 plus the rate: 1,180 divided by 1.18 gives back 1,000. Many people make the mistake of subtracting 18 percent from 1,180, which gives the wrong answer because the tax was charged on the smaller base amount.

For invoices, keep the base amount, the tax and the total on separate lines so that the buyer and the accountant can both follow the numbers.

Percentage change compares a new value with the old one: take the difference, divide by the old value, and multiply by 100. If a price rises from 80 to 100, the change is 25 percent. If it then falls from 100 back to 80, the change is minus 20 percent, not minus 25. The base is different each time, which is why up 25 and down 20 cancel out.

This one fact explains many confusing headlines about sales, salary hikes and stock moves. Always ask what the starting number was before you judge how big a percentage is.

Inflation is the general rise in prices. If it runs at 6 percent a year, something that costs 100 today costs about 106 next year, and money sitting idle buys a little less each year. A savings account paying less than inflation is losing purchasing power even while the balance goes up.

The practical lesson is to compare any return with inflation, not with zero. A 7 percent return in a 6 percent inflation year is a real gain of about 1 percent. Use an inflation calculator to see what a future expense, such as a college fee, may cost in today’s terms and plan your savings target from that.

For a discount, multiply the price by the percentage and subtract it. A 30 percent discount on 2,000 is 600, so you pay 1,400. A quick mental trick: find 10 percent by moving the decimal one place, then multiply. For a tip of 15 percent, take 10 percent and add half of it.

When stores offer two discounts in a row, such as 20 percent and then another 10 percent, they do not add up to 30. The second discount applies to the already reduced price, so the true saving is 28 percent. A calculator removes the guesswork when the numbers are less friendly.

Length matters most. Every extra character multiplies the number of guesses an attacker needs, so a 16 character password is vastly harder to crack than an 8 character one, even if the shorter one has more symbols. Randomness matters second. People are predictable: names, birth years and keyboard patterns are the first things guessing programs try.

The best approach is a long random password, or a few unrelated words joined together, that is unique to each account. A generator uses your browser’s secure random number source, so the result has no pattern for anyone to guess. Store the passwords in a reputable password manager so you only need to remember one.

A strength checker looks for the things attackers look for: short length, common words, repeated characters, simple substitutions like “@” for “a”, and well-known patterns. A password that feels clever to you, such as a pet name with a number at the end, usually appears in the lists criminals already hold.

Never type a password you are currently using on a website you do not trust. Toolcloak checks everything inside your browser and sends nothing out, but as a habit, test the pattern of a password rather than the real one, and change any password that scores poorly.

A hash is a fixed-length fingerprint made from any input. The same input always gives the same fingerprint, but a tiny change, even one letter, gives a completely different one, and you cannot work backwards from the fingerprint to the original. That makes hashes useful for checking that a download was not altered and for storing passwords safely.

A responsible website never stores your actual password. It stores a hash, and when you log in it hashes what you typed and compares the two. Modern systems add a random value called a salt and use slow hashing methods so that stolen data is hard to crack.

Two-factor authentication asks for something you know, your password, and something you have, usually a code from an app or your phone. Even if a criminal learns your password, they still cannot get in without the second item. Turn it on for email first, because email can be used to reset every other account you own.

Prefer an authenticator app or a hardware key over text messages when you have the choice, since phone numbers can be taken over by fraud. Keep the backup codes somewhere safe and offline in case you lose your phone.

Phishing messages try to rush you. They claim your account is locked, a payment failed or a parcel is waiting, and they push you to click a link right now. Real companies rarely ask for passwords, card numbers or one-time codes by message or call.

Check the sender address carefully, because look-alike domains swap letters for similar-looking ones. Hover over or long-press a link to see where it really goes before opening it. When in doubt, ignore the link and open the company’s app or type its address yourself.

There is no single right length, only the right length for the job. A search result description fits about 150 to 160 characters. A social media caption does well under 150 words. A school essay usually has a word range set by the teacher, and a helpful blog article often runs from 800 to 2,000 words depending on how much ground it covers.

A word counter also shows characters, sentences and reading time. Reading time is useful: average adults read roughly 200 to 250 words a minute, so a 1,000 word article takes about four to five minutes. If a piece feels long, cut repeated ideas before you cut useful detail.

Sentence case capitalises only the first word, title case capitalises the main words, upper case is all capitals and lower case is none. Programmers also use camelCase, which joins words and capitalises each after the first, snake_case with underscores and kebab-case with hyphens for names in code and web addresses.

Using the right case keeps writing consistent. A heading in title case followed by one in sentence case looks careless. A converter fixes a pasted block in one click, which is far quicker than retyping text that was accidentally typed with caps lock on.

Use short sentences and everyday words. Aim for an average of about 15 to 20 words per sentence, and break up any paragraph that runs past five or six lines. Lead with the main point, then give the detail, because many readers decide in the first two lines whether to continue.

Cut filler such as “in order to”, “very” and “really”. Prefer active sentences, “the team fixed the bug”, over passive ones, “the bug was fixed by the team”. Read the piece aloud once. Any place where you stumble is a place the reader will stumble too.

Accuracy first, speed second. Typing slowly and correctly builds muscle memory, while rushing and correcting teaches your fingers the wrong patterns. Keep your fingers on the home row, look at the screen rather than the keys, and practise for ten or fifteen minutes a day instead of one long weekly session.

Average typists manage about 40 words per minute and skilled ones pass 70. A timed test gives you a baseline, and testing every week shows real progress. Aim to improve by a few words per minute each month rather than chasing a big jump.

Yes, both are built into modern browsers. Text to speech reads a passage aloud, which helps with proofreading, learning a language or listening while you do something else. Speech to text lets you dictate and then edit, which can be quicker than typing on a small phone keyboard.

For dictation, use a quiet room, speak in full phrases and say punctuation aloud if needed. Always read the transcript afterwards, because names and technical words are the most common mistakes.

JSON is a simple text format for passing data between programs: names and values wrapped in curly braces and square brackets. It is everywhere, from phone apps talking to servers to the settings files of tools you use. A single missing comma or quote makes the whole thing invalid.

A formatter indents the data so you can read the structure, and a validator points to the exact line of the mistake. Minifying does the opposite and removes spaces to make the file smaller for sending. Format while you work, minify before you ship.

Base64 turns any data into plain letters and numbers so that it can travel safely through systems built for text, such as email or web addresses. Embedded images in web pages and many login tokens use it. The result is about a third larger than the original.

It is not encryption. Anyone can decode Base64 in a second, so it never protects a secret. Treat it as a packing format only, and use real encryption when privacy matters.

A UUID is a 36-character identifier such as 123e4567-e89b-12d3-a456-426614174000 that is generated so randomly that the chance of two matching is close to zero. Developers use them as record IDs in databases, file names and order numbers, because they can be created anywhere without checking a central list.

The common random version is called version 4. If you only need to be certain an ID is unique, a UUID is the simplest answer and needs no coordination between servers.

A Unix timestamp counts the seconds since midnight UTC on 1 January 1970. It gives computers one unambiguous number for a moment in time, with no time zone or date format confusion. Some systems count in milliseconds instead, which makes the number three digits longer.

When a log file or API shows a number like 1760000000, a converter turns it into a normal date and time in your own time zone. Always confirm whether you are looking at seconds or milliseconds before you trust the result.

Readability depends on the contrast ratio between text and background. Accessibility guidelines ask for at least 4.5 to 1 for normal text and 3 to 1 for large text. Light grey on white often looks stylish on a designer’s screen but is hard for many people to read, especially outdoors or on an older phone.

Check every pair of colours you use for buttons, links and body text. Good contrast helps everyone, not only people with low vision, and it is a basic part of building a website that is pleasant to use.

A pixel size is fixed, while a rem is a multiple of the browser’s base font size, usually 16 pixels. If a visitor increases their default text size for comfort, sizes written in rem grow with it, and sizes written in pixels do not.

To convert, divide the pixel value by 16: 24 pixels is 1.5 rem. Using rem for text and spacing makes a layout more accessible and easier to scale across screens.

BMI is your weight in kilograms divided by your height in metres squared. It is a quick screening number, not a diagnosis. It cannot tell muscle from fat or show where weight sits on the body, so a muscular person can look overweight and a person with little muscle can look normal.

Many Asian health guidelines also flag risk at lower values than the standard 25 cut-off. Use BMI as a starting point for a conversation with a doctor, and pay attention to waist size, fitness and how you feel as well. This is general information, not medical advice.

Counting years, months and days by hand goes wrong because months have different lengths and leap years add a day. A calculator handles those rules and also tells you how many days remain until your next birthday.

The same idea works for the time between any two dates, such as the days left to an exam, a visa deadline or a notice period. For work deadlines, a working-days counter that skips weekends is often more useful than raw days.

Most adults do best on seven to nine hours. Sleep runs in cycles of roughly 90 minutes, and waking in the middle of a deep cycle is what makes you feel groggy. Planning a bedtime so you wake at the end of a cycle often feels better than a few extra minutes of sleep.

Allow around 15 minutes to fall asleep. Keep a steady wake-up time, dim screens before bed, and avoid caffeine late in the day. If tiredness lasts for weeks, speak to a doctor.

A simple average adds the values and divides by how many there are. A weighted average gives each value a weight, such as credit hours: multiply each grade by its weight, add those up and divide by the total weight. This is why a low grade in a heavy course affects your GPA more than the same grade in a light one.

Before you try to raise a GPA, work out what the next term needs. The calculator shows the exact grades that move the result, which turns a vague worry into a clear target.

Most mistakes come from guessing the factor. Write the unit you start with, multiply by a known ratio and make sure the old unit cancels. For example, 5 miles times 1.609 gives about 8 kilometres. Temperature is the exception because it uses an offset as well as a multiplier, so Fahrenheit to Celsius needs subtraction before multiplying.

A converter covers length, weight, volume, speed, area and temperature at once, and it is faster than searching for each factor again. For cooking, remember that a cup of flour and a cup of sugar do not weigh the same, so use grams when a recipe gives them.

The Pomodoro method splits work into 25 minute focused blocks with a five minute break between them, and a longer break after four blocks. A short, clear deadline makes it easier to start, and regular breaks stop the slow drop in attention that comes from long unbroken stretches.

Pick one task per block, put your phone out of reach, and write down stray thoughts to deal with later instead of switching away. If 25 minutes feels too long at first, start with 15 and build up.

For the tools that handle files, such as compressing images or merging PDFs, the work happens inside your own browser using your own device. The file is read in memory, changed there and handed back to you. It is not sent to a server, which is why these tools also keep working on a slow connection once the page has loaded.

That design is deliberate. It means your photos, documents and text stay with you, and it removes the risk of a copy being left on someone else’s computer.

No. There is no sign-up and no login. Anything the site remembers for you, such as recent tools, starred tools and saved results in My Space, is stored in your own browser and never in an account on our side.

The trade-off is that this information lives on one device. If you want to move it, My Space has an export and import option, and clearing your browser data removes it.

A chain links tools in a row so the result of one flows into the next. For example, resize a photo, convert it to PDF and then compress it, all in one run that you can save and repeat. Studio is a larger workspace for jobs that need more room, such as editing a PDF, designing a poster, charting data or writing a document.

Both are built from the same browser-based tools, so the same privacy rules apply: your work stays on your device.

Use the search box on the home page to jump straight to a tool, or browse by category if you are not sure what you need. Star the tools you use often so they appear first, and look at My Space to find recent files again.

Installing the site on your phone’s home screen makes it behave like an app and lets many tools work offline. If a tool is missing, tell us, because new tools are added every week.