pocket notes — the tools edition
A pocketful of little tools, for the everyday.
Little tools that just work. Free to use, no sign-up, nothing to install. Each card has its own page — tap one and step inside.
don't know what to look for? try «base64» or «temperature».
Add page numbers to PDF
Stamp page numbers on a PDF with your own format, position and starting number.
because page 47 of 112 deserves a label.
Age calculator
Your exact age in years, months and days on any date, plus total days lived, total weeks and the countdown to the next birthday.
time keeps excellent records, and now so do you.
Aspect ratio calculator
Find the missing width or height for any aspect ratio, with presets for 16:9, 4:3, 1:1 and more.
the number that stops a video from looking like a funhouse mirror.
Mean, median and mode calculator
Paste a list of numbers for the mean, median, mode, count, sum, minimum and maximum, with blanks and stray words quietly ignored.
three averages, one list, and no agreement about which one is in charge.
Base64 encoder / decoder
Encodes text to base64 and back, with full UTF-8 so accents and emojis survive. Plus a URL-safe mode for tokens and URLs that hate the equals sign.
base64 is not encryption — it's a jacket, not a safe.
Binary & decimal converter
Two directions, one widget: binary to decimal and decimal to binary, with the powers of two shown. Ones and zeros, dressed up and sent home.
there are 10 kinds of people — those who get this joke, and those who don't.
CSS box shadow generator
Dial in offset, blur, spread, color and inset, watch the shadow update live, and copy the exact CSS box-shadow rule.
a shadow is just a rectangle's opinion of the light.
Break-even calculator
Fixed costs, price and variable cost per unit — get the contribution margin and the number of sales before you stop losing money.
the exact point where the spreadsheet stops frowning.
CAGR calculator
Turn a starting value, an ending value and a number of years into a compound annual growth rate, plus total growth and multiple.
CAGR is the smooth number you show people instead of the bumpy chart.
Case converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case or kebab-case as you type.
capitalization is a lifestyle choice until an API rejects it.
Color contrast checker
Compare text and background colors with the WCAG contrast ratio, plus pass or fail for AA and AAA at normal and large sizes.
gray on gray is a design choice, and the choice is usually regret.
Color converter
One colour, three languages. Pick it, drag it or type it — HEX, RGB and HSL all stay in sync, with a swatch that shows exactly what you're getting.
hue 0° and 360° are the same red — colour wheels are surprisingly round.
Color palette generator
Build a palette from any hex color: complementary, analogous, triadic and more. Copy every hex or the whole CSS block in one click.
five colors that get along, which is more than most offices manage.
Color picker from image
Upload a JPEG or PNG and click any pixel to get its hex, RGB and HSL values. Everything stays in your browser.
the exact color, without opening a design app.
Compound interest calculator
See what a starting sum plus monthly contributions becomes, with monthly, quarterly or annual compounding and a year-by-year table.
compounding is interest doing push-ups while you sleep. it just takes years.
Compress image to size
Compress a JPEG or PNG to a target size in KB, entirely in your browser. Quality first, then dimensions.
for the form that only accepts files under 200 KB.
CSV to JSON converter
Turn a CSV table into a JSON array of objects, with comma, semicolon or tab delimiters and proper handling of quoted fields.
a comma inside quotes is a comma with a permission slip.
Data storage converter
One value, every size — bits, bytes, and decimal and binary kilo, mega, giga, tera, peta. A gigabyte means two things, depending on who's selling.
KB is 1,000 and KiB is 1,024 — the difference is why your 1 TB drive shows 931 GB.
Data transfer rate converter
Convert Mbps, Gbps, MB/s and more in one screen. See why a 1 Gbps line downloads at about 125 MB/s.
the internet is fast until you divide by eight.
Days between dates
Count the days between two dates, see them as weeks and days, and add business days with weekends left out.
the calendar is the only colleague that never asks for an extension.
Discount calculator
Work out the final price after a discount or the percentage off between two prices, with the amount saved updated as you type.
the tag says 50% off. your self-control says full price, plus shipping.
Extract PDF pages
Pull selected pages out of a PDF into a new document, ready to download.
the good pages, without the appendix.
Extract text from PDF
Pull the text layer out of a PDF, page by page, and copy or download it as a .txt file.
the words were in there all along.
Favicon generator
Turn an image or a couple of characters into PNG favicons at every size, with a ready-to-paste HTML snippet.
the tiny square that decides whether your tab looks professional.
Find and replace
Replace words or regex patterns in any text, with a case toggle, a live match count and one-click copy of the result.
find is easy. replace is where the plot thickens.
Fraction & decimal converter
Two directions, one widget: fractions become decimals and decimals become fractions — including the stubborn repeating ones. Simplified, mixed and honest.
a fraction is just division being shy about it. we coax it out.
CSS gradient generator
Design a CSS gradient with a live preview, then copy the exact background rule. Linear, radial or conic, with as many stops as you need.
a sunset in a div, minus the sand.
Hash generator
Turns any text into a fixed-length fingerprint with your choice of algorithm — MD5, SHA-1, SHA-256, SHA-384 or SHA-512. Same input, same output.
a hash is a one-way fingerprint — it's a blender, not a shredder that reverses.
HTML entity encoder
Escape ampersands, angle brackets and quotes into HTML entities, or decode entities back into plain text, entirely in your browser.
entities are how HTML says a character without actually meaning it.
Image compressor
Compress JPEG and PNG images in your browser. Choose the quality and maximum size, then download — nothing is uploaded.
smaller files, same picture, no server in the middle.
Image cropper
Crop JPEG and PNG images in your browser. Drag a selection, lock an aspect ratio, apply and download.
the bit you wanted, without the bit you did not.
Image format converter
Convert PNG to JPG or JPG to PNG in your browser. Pick the target, set JPEG quality and download — no upload, no server.
same pixels, different wrapper, no server involved.
Image resizer
Resize JPEG and PNG images by exact pixels or percentage, keep the aspect ratio, and download the result locally.
new dimensions, same photo, zero uploads.
Rotate and flip image
Rotate JPEG and PNG images by 90, 180 or 270 degrees and flip them horizontally or vertically, locally.
the photo was sideways; now it is not.
Image to Base64 converter
Turn a JPEG or PNG into a base64 data URL, with a copy-ready HTML snippet. The file never leaves your browser.
a picture disguised as text, which is exactly what a data URL is.
Image to PDF converter
Turn JPEG and PNG images into a single PDF in your browser. Choose page size, orientation and margins, then download.
a folder of photos, pretending to be one tidy document.
Inflation calculator
See what inflation does to an amount over the years, forwards or backwards, and how much purchasing power quietly disappears.
inflation is a tax on patience, collected in small coins.
JSON formatter
Format, minify and validate JSON in your browser, with a line and column for every error and an optional sort that puts keys back in order.
JSON has no comments and no trailing commas. JavaScript has a lot to answer for.
JWT decoder
Paste a JSON Web Token and read its header and payload as formatted JSON with claim timings — signature not verified, inspection only.
we read the envelope, not the seal. the seal is somebody else's job.
Length converter
One value, every unit — millimetres, metres, miles and more at once. Because a mile means different things on land and at sea.
1 inch ≈ 2.5 cm is how doors and countries end up slightly wrong.
Loan calculator
Monthly payment, total paid and total interest for any loan, with a year-by-year breakdown of where the money actually goes.
the bank calls it amortization. you will call it the years the interest gets paid first.
Lorem ipsum generator
Lorem ipsum with paragraphs, sentences or words, a classic-opening toggle, HTML tags for designers, and the complete original passage for purists.
generating gibberish is the one form of nonsense this site fully supports.
Merge PDF
Combine several PDFs into one document, in the order you choose. Everything runs in your browser.
three PDFs walk into a bar and leave as one.
Meta tag generator
Generate title, description, Open Graph and Twitter card tags from one small form, with live character counts and a copy button.
meta tags are invisible to readers and decisive in group chats.
Number to words
Spell any number up to the billions in English words, including tenths and hundredths, ready to paste into a check or a contract.
because a check written in digits is a check written in hope.
Password generator
Random passwords with your chosen length and character sets. With a strength meter that tells you if it'll survive a coworker with a birthday list.
longer beats clever. "correct horse battery staple" laughs at "Tr0ub4dor&3".
Password strength checker
Analyze a password's length, character mix, entropy and estimated crack time without it leaving your browser.
the meter does the judging; the password never leaves the room.
PDF to JPG converter
Convert PDF pages to JPG or PNG images at 72, 150 or 300 DPI, with a ZIP for multi-page files.
pages that stop being pages and start being pictures.
Percentage calculator
Four classic operations: a percentage of a number, one number as a percentage of another, percentage change, and add or subtract a percentage. All live.
percentages are opinions with decimals. we just make the decimals honest.
Power converter
One value, every power — milliwatts, watts, kilowatts, megawatts, gigawatts, horsepower and BTU/h. From the bulb to the power plant, at once.
1 hp ≈ 1.014 PS — the European horse is slightly stronger.
Profit margin calculator
Find gross profit, margin and markup from cost and selling price, or enter a target margin and get the price to charge.
margin is profit over price, markup is profit over cost — one always sounds better.
QR code generator
Turn any URL or text into a QR code and download it as PNG or SVG. Everything runs in your browser — nothing is uploaded.
a square that says more than you typed, and never phones home.
Random number generator
Pick random numbers in any range, with optional no-repeats and decimals. Uses your browser's cryptographic random source.
fair enough for a raffle, honest enough not to promise the lottery.
Readability checker
Paste any text and get a Flesch Reading Ease score, a Flesch-Kincaid grade and the word, sentence and syllable counts behind them.
writing simply is hard. we handed it a number and a school grade anyway.
Regex tester
Test a regular expression against your own text and see every match, its position, the capture groups and a live replacement preview.
a regex is a cat — elegant, powerful, and it will knock something off the table.
Remove PDF pages
Delete selected pages from a PDF and download the trimmed document. Nothing is uploaded.
some pages were never meant to make the final cut.
ROI calculator
Cost in, final value out, and the percentage that decides whether you brag or quietly delete the spreadsheet. With the annualized return for the patient.
negative ROI is not failure — it's a discounted lesson.
Rotate PDF
Rotate all or selected PDF pages by 90, 180 or 270 degrees and download the fixed file.
the scan was sideways; the fix is not.
Salary & hourly converter
Two directions, one widget: hourly rate to salary, or salary back to the hourly rate it's worth. With your hours per week and weeks per year.
comparing jobs by annual salary is how people end up working two jobs.
Savings goal calculator
Set a goal, your current balance, a deadline and a return, then see the monthly amount it takes with interest included.
a goal without a monthly number is just a wish with a deadline.
Meta description length checker
Measures your meta description against the ~160 characters Google shows, with a live snippet preview, a gauge, and a verdict on how it feels.
the first 60 characters do the heavy lifting — put the answer there.
Shoe size converter
One size, every system — cm, EU, UK and US men's and women's, plus kids sizes. Because a size 5 means different things to toddlers and adults.
shoe sizes are approximate and brands differ — a guide, not a blood oath.
Slug generator
Turn any title into a clean URL slug: lowercase, accents stripped, punctuation and spaces collapsed into single hyphens.
a slug is a title that has finally learned to behave in public.
Sort lines
Sort lines A to Z or Z to A, numerically or ignoring case, with duplicate removal and blank-line cleanup in one live list.
for lists that arrived in the order the universe felt like that day.
Speed converter
One value, every speed — metres per second, km/h, mph, feet per second and knots. The three languages of "please don't speed".
100 km/h ≈ 62 mph ≈ 28 m/s. pick your favourite denial.
Split PDF
Split a PDF into separate files by page ranges or every N pages, and download them as a ZIP.
one document, several smaller arguments.
Standard deviation calculator
Get the mean, population and sample standard deviation, both variances and the arithmetic steps from one pasted list of numbers.
spread is just distance that went to statistics school.
Temperature converter
One value, every scale. Type a number, pick its unit, and it becomes Celsius, Fahrenheit and Kelvin at once — with an honest opinion on how it feels.
−40 is where Celsius and Fahrenheit finally agree — and where you regret everything.
Text diff checker
Compare two blocks of text line by line and see exactly what was added, what was removed and what survived untouched.
two versions of the truth enter, one honest line count leaves.
Text repeater
Repeat any text up to 1,000 times with a newline, space, comma or your own separator, then copy the whole stack in one click.
ctrl+c, ctrl+v, ctrl+v, ctrl+v. we automated the middle part.
Time converter
One value, every time — seconds, minutes, hours, days, weeks, months and years. Because a year means different things to calendars and courtrooms.
a day is 86,400 seconds — the number your alarm clock mocks you with every morning.
Tip calculator
Bill, tip percentage and how many friends to blame. Get the tip, the total and per person — live, with an optional round up for the server.
tipping is social math. we do the arithmetic, you do the small talk.
Typing speed test
Type the phrase as fast as you can while the letters above blush in ink or bleed in red. WPM, accuracy and a verdict you didn't ask for.
your first result is your warm-up. do not panic, do not blame the keyboard.
Unit price calculator
Compare two products by price per gram, liter or item, because the bigger box is not always the better deal.
the big box is only a bargain if the math agrees. the math is right here.
Unix timestamp converter
Convert epoch seconds or milliseconds to local time and ISO 8601, and turn any date back into a timestamp — live in both directions.
time is a flat circle, and it started in 1970. someone had to pick a year.
URL encoder / decoder
Percent-encode text for a URL or decode escapes back into readable text, with component and whole-URL modes that update as you type.
percent signs are load-bearing. we treat them with respect and a little suspicion.
UTM link builder
Build a campaign link from a base URL and five UTM fields, keeping the query parameters you already had and encoding the rest properly.
a link without utm parameters is just a link with a dream.
UUID generator
Random UUIDs in batches, with version, count and formatting at your command. v4 for the standard, v1 for the timestamped, uppercase or compact.
UUIDs are unique-ish, not unique-guaranteed — but the odds are so small your browser crashes first.
VAT calculator
Add VAT to a net amount or take it out of a gross one, with net, tax and total updating as you type at any rate.
VAT is included in the price. so is the mild disappointment.
Volume converter
One value, every volume — millilitres, litres, cups, pints, gallons and more at once. Because a cup means different things to bakers and plumbers.
4 cups ≈ 1 litre — good enough for soup, risky for science.
Weight converter
One value, every weight — grams, kilos, tonnes, ounces, pounds, stones and tons. Because a stone is a measurement, not an emotion.
1 kg ≈ 2.2 lb is how luggage and dumbbells make sense at once.
Whitespace remover
Strip tabs, line breaks and repeated spaces from any text with separate switches for each, then copy the clean result in one click.
whitespace is invisible until it ruins the paragraph you just pasted.
Word counter
Counts words, characters, sentences and reading time as you type. Perfect for essays, tweets and SEO descriptions.
counting is free. like this widget, and like good advice.
Word frequency counter
Rank the top 20 words in any text with counts and density percentages, and filter out common English filler with one toggle.
your most-used word is trying to tell you something.
nothing here.
not even a button to complain about it.