Tools that just work

How to Convert a JPG to PNG (and When You Shouldn't)

Convert a JPG to PNG free in your browser.

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How to Crop an Image into a Circle (Transparent PNG)

Crop any photo into a clean circle with a transparent background — perfect for profile pictures and avatars.

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How to Generate a UUID (and Which Version to Use)

Generate a UUID free in your browser, understand v4 vs v1 vs v7, and know when a UUID is the right kind of ID for your data.

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How to Encode and Decode Base64 (Plain English)

What Base64 actually is, when you need it, and how to encode or decode text free in your browser without pasting sensitive data into a random site.

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How to Decode a JWT (and What Each Part Means)

Decode a JSON Web Token to read its header and payload, understand the three parts, and see why decoding is not the same as verifying.

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How to Format Messy SQL So You Can Actually Read It

Turn a wall of one-line SQL into a clean, indented query you can read and debug.

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How to Convert JSON to YAML (and Why Config Files Use It)

Convert JSON to YAML for config files, and understand the indentation rules that trip people up.

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How to Test a Regular Expression Without Breaking Things

Test a regex against real text, see what it matches live, and learn the handful of patterns that cover most jobs.

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How to Remove Duplicate Lines from a List

Strip duplicate lines from any list — emails, URLs, keywords — in seconds, in your browser.

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How to Convert a Unix Timestamp to a Date

Convert a Unix timestamp to a readable date and back, understand seconds vs milliseconds, and avoid the timezone mistakes that cause off-by-hours bugs.

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How to Calculate an Exact Age in Years, Months and Days

Work out an exact age from a birth date — years, months and days — and understand why simple subtraction gets it wrong.

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How to Calculate the Number of Days Between Two Dates

Count the days (or working days) between two dates without miscounting the ends.

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How to Calculate Compound Interest (and Why It Beats Simple Interest)

See how compound interest grows your money, why compounding frequency matters, and how a small rate change compounds into a big difference over time.

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How to Calculate a Mortgage Payment (and What's Hiding in It)

Work out a monthly mortgage payment, see how much is interest versus principal, and understand why a longer term costs far more overall.

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How to Calculate Percentage Change (Increase or Decrease)

Calculate a percentage increase or decrease correctly, and avoid the classic trap where a 50% drop needs a 100% rise to recover.

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How to Convert Units Correctly (Without a Rounding Mess)

Convert length, weight, temperature and more without the rounding and 'which way round' mistakes.

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How to Generate a Hash (MD5, SHA-256) and Check a File

Generate an MD5 or SHA-256 hash to verify a download or check a file hasn't changed.

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How to Create a CSS Gradient (Linear and Radial)

Build a smooth CSS gradient, get the code to paste into your site, and avoid the muddy 'grey middle' that ruins a lot of gradients.

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How to Generate a Color Palette That Actually Works Together

Build a colour palette from a base colour using real colour theory, and learn the 60-30-10 rule that keeps designs from looking chaotic.

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How to Check Color Contrast for Accessibility (WCAG)

Check whether your text and background colours are readable, understand the WCAG AA and AAA ratios, and fix low-contrast text.

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How to Convert HEX to RGB (and When You Need Each)

Convert a HEX colour to RGB or RGBA, understand what the pairs of characters mean, and know which format to use where in CSS.

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How to Convert Text Case (UPPER, lower, Title, Sentence)

Change text to uppercase, lowercase, Title Case or Sentence case in one click, and know which case belongs where.

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How to Generate a Clean URL Slug from a Title

Turn a page title into a clean, SEO-friendly URL slug — lowercase, hyphenated, no accents or symbols.

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How to Generate Lorem Ipsum (and Why Designers Use It)

Generate placeholder Lorem Ipsum text for mockups, learn why fake Latin beats real text in a design, and when to stop using it.

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How to Make a Meme (Classic Top-and-Bottom Text)

Add bold, outlined caption text to any image to make a meme — free, in your browser, nothing uploaded.

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How to Pick a Random Winner Fairly (Giveaways and Draws)

Pick a random winner from a list of names or entries in a way people will trust.

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How to Make a Barcode Online (Free, No Software)

Create a Code 128, EAN, UPC or QR barcode in your browser — one at a time or in bulk as a ZIP.

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How to Scan a QR Code on a Computer

No phone handy? Scan from your webcam or from a screenshot — free, no app, nothing uploaded.

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How to Convert JSON to CSV

Turn a JSON array into a spreadsheet-ready CSV in your browser, and what to watch for with nested data.

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How to Convert CSV to JSON

Turn a spreadsheet export into clean JSON for an API or app — the header row becomes your keys.

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How to Add a Watermark to a Photo

Stamp your name or logo across a photo so it cannot simply be cropped off — free, nothing uploaded.

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How to Calculate a Loan Payment

Work out the monthly payment and the total interest — and the trap with stretching a loan longer.

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How to Make an Invoice for Free

Create a clean PDF invoice and learn what every invoice needs to actually get paid on time.

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How to Convert Markdown to HTML

Turn Markdown into clean HTML you can paste straight into a website, CMS or newsletter.

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How to Convert Text to Speech Free

Have any text read aloud in your browser — great for proofreading — using your device's own voices.

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How to Make a Favicon for Your Website

Turn a square image into the little browser-tab icon, and add it to your site the right way.

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How to Open a ZIP File Online (No Extra Software)

Open a ZIP in your browser and pull out what is inside — no WinZip, no upload, plus password-protected ones.

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How to Open a RAR File Online Without WinRAR

RAR normally needs WinRAR installed. Here is how to open one free in your browser, including RAR5 archives.

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How to Create a Strong Password (and Actually Remember One)

Why length beats symbols, why reusing passwords is the real danger, and how to manage them.

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How to Calculate a Percentage (The Three Types People Mix Up)

There are three different percentage questions hiding in one. Tell them apart and get the right answer.

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How to Format Messy JSON (and Fix the Errors)

Turn one unreadable line into something you can read, and find the misplaced comma — privately.

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How to Count Words and Characters in Your Text

Word limits, meta-description lengths, social caps — which count matters where, and how to hit it.

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How to Calculate Your BMI — and What the Number Misses

How BMI is worked out, what the categories mean, and the important things the number can't tell you.

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How to Calculate a Tip (and Split the Bill)

A quick mental method for any tip, how much is customary, and how to split a bill without arguments.

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How to Convert Time Zones Without Missing a Meeting

Why the gap between two cities isn't fixed, and the daylight-saving trap that causes missed calls.

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How to Open a CSV File Without Excel Mangling It

Why spreadsheets wreck CSV data — dropped zeros, mangled dates — and how to view one cleanly.

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How to Redact a PDF So the Text Can't Be Recovered

Black boxes over text can be copied straight back out. Here is how to remove sensitive text for good.

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How to Sign a PDF for Free (Without Printing Anything)

Add your signature in your browser — and know when you need a certificate-based digital signature instead.

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How to Merge, Reorder, and Delete Pages in a PDF

Combine scans into one file, drop a blank page, or reorder a report — all in your browser.

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How to Compress a PDF Without Wrecking the Quality

What actually makes a PDF heavy, how to shrink it, and how to keep the text sharp.

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How to Split a PDF into Separate Files

Pull one section out of a report, or break a big scan into single pages — free and private.

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How to Combine Images into a Single PDF

Turn a folder of photos or phone scans into one tidy PDF, in the right order.

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How to Convert a PDF into Images (JPG or PNG)

Turn each page of a PDF into a picture for a slide, a website, or anywhere that won't take a PDF.

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How to Add Page Numbers to a PDF

Add page numbers with control over where they sit and where the count starts.

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How to Add a Watermark to a PDF

Stamp DRAFT, CONFIDENTIAL, or your name across a PDF so copies are marked and traceable.

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What Is a HEIC File — and How to Convert It to JPG

Why iPhones save photos as HEIC, when to convert, and how to turn them into JPG for free.

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How to Pull Text Out of an Image or Screenshot

How OCR works, how to get accurate results, and how to extract text from an image free in your browser.

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Your Photos Know Where You Live: How to Strip EXIF Data

Every photo can carry the exact GPS coordinates where it was taken. Here is how to remove that data.

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How to Resize an Image to Exact Dimensions

Resize an image in pixels without stretching it — for upload limits, avatars and more.

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How to Reduce Image File Size (Without It Looking Bad)

What actually shrinks an image, and how far you can push it before it starts to show.

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How to Make a QR Code (That You Actually Own)

Create a free QR code that never expires — and why some free ones quietly do.

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