Search all tools

Every Capsule Tool in one place — start typing to filter by name or what it does. Everything runs in your browser; nothing is uploaded.

Image

Photo to Web

RAW, HEIC & DNG → web-ready JPG

EXIF Remover

Strip EXIF, GPS & metadata from photos

Background Remover

AI cutout to a transparent PNG

Image Compressor

Shrink & convert JPG, PNG & WebP

Image Converter

Convert images to JPG, PNG, WebP or PDF

Favicon Generator

Image → favicon.ico, PNGs, Apple touch icon & manifest

Image Cropper

Crop to a square, circle or any ratio

Batch Image Resizer

Resize many images at once → ZIP

Lithophane Generator

Photo → 3D-printable STL

App Screenshot Framer

Frame app screenshots for App Store & Play, free, no upload.

Color Contrast Checker

WCAG contrast ratio checker with AA/AAA pass/fail badges

Image Macro Generator

Add top and bottom text to a photo. No watermark.

Image Flipper

Flip a photo horizontally or vertically, no upload

Full Wrap Mug Mockup

Turn a flat design into a 3D full-wrap mug mockup

Grid Image Generator

Overlay a drawing grid on a photo, or build a blank one.

Image Color Picker

Pick HEX, RGB and color names from any photo

Image Compare

Compare two images with a before/after slider

Image Prep

Crop, resize and compress images, one or a batch

Image to ASCII

Turn a photo into ASCII text art to copy and paste

Grayscale Converter

Make a photo grayscale: 3 methods, same size and format

Pixel Art Converter

Turn a photo into pixel art with retro palettes

JPEG Artifact Generator

Add crunchy 'needs more JPEG' artifacts to a photo

Image to SVG Converter

Trace a PNG, JPG or WebP into an SVG for logos and Cricut

Image Upscaler

Enlarge small or blurry images 2× or 4× with on-device AI

Image Color Inverter

Invert image colors to a true negative, keeping transparency

Mesh Gradient Generator

Drag color points into a mesh gradient, copy CSS or SVG

Photo Grid Printer

Print 2 to 16 photos per page on A4 or Letter

Photo to Text

Image to text: read a photo or screenshot, 29 languages

Photo Watermarker

Add a text watermark to a photo, single or repeated

PNG Compressor

Shrink a PNG by reducing colors, with before/after slider

Video

GIF Compressor

Compress a GIF — smaller file, no upload

GIF Frame Splitter

Split a GIF into individual PNG or JPG frames

GIF Speed Adjuster

Change a GIF's playback speed — instant, no upload

Video to GIF

MP4, MOV & WebM → animated GIF

Video Speed Changer

Speed up or slow down a video in your browser

Video Trimmer

Cut a clip from a video

Video Thumbnail Generator

Save any video frame as a JPG or PNG thumbnail

Convert to WebM

Convert video or audio to WebM free — no upload, no account.

Frame Counter

Exact frame count, FPS & duration — no upload

Frame Skipping Test

Photograph a v-synced grid to check for dropped frames

Sequence to MP4

PNG or JPG image sequence to MP4, free, no upload

Video Compressor

Shrink a video to 8 MB for Discord or 25 MB for email

Audio

Decibel Meter

Live dB level from your mic, with average and peak

MP3 to WAV

Convert MP3 audio to uncompressed WAV

Slow Down Audio

Slow down audio or video, keeping or dropping pitch

Voice Recorder

Record your voice in-browser, then download it

White Noise Generator

Play white, pink & brown noise to mask distractions

Computer Keyboard Piano

Play piano on your computer keyboard, in the browser

Guitar Tuner

Tune a guitar by ear with your microphone — many tunings

Audio Oscilloscope

See live audio waveforms from your mic or a file

Audio Spectrum Analyzer

See live frequency peaks and notes, mic or file

Audio to Mono

Convert stereo audio to a true mono WAV track

Audio Transcriber

Transcribe audio or video to text — free, no upload

Baby Shusher

Shush, white noise & vacuum sounds to soothe babies

Binaural Beats Generator

Custom binaural beats for focus, sleep & meditation

BPM to MS Converter

BPM to ms & Hz chart for delay, reverb & LFO timing

Pitch to BPM Calculator

New BPM after a pitch shift, in semitones, cents or speed %

Coffee Shop Noise

Endless coffee shop background noise, nothing streamed

Audio A/B Tester

A/B test two audio files in sync with one big switch

Filler Word Remover

Remove um, uh and you know from text, punctuation fixed

LUFS Meter

Measure LUFS and true peak of an audio file

Mono Audio Checker

Flip a mix to mono and watch the phase meter

Rain Sound Generator

Endless rain sound with a pure black screen for the night

Remove DC Offset

Remove DC offset from a sample, recording or wavetable

Reverse Reverb Generator

Reverse reverb swell that builds into your sound

Waveform Visualizer

Turn audio into an animated waveform video

Text

Reading Ease Checker

Flesch reading ease score for pasted text, live as you type

Word Counter

Count words, characters & reading time

Find and Replace

Swap words, phrases & regex patterns in text

Address Cleaner

USPS address formatter — clean text or CSV, free

Plain Text Converter

Strip fonts, colours, bold & links from copied text

Word Cloud Generator

Paste text → word cloud, download as PNG or SVG

Text Summarizer

Summarize long text down to its key sentences

Alphabetize List

Paste a list, sort it A-Z instantly — free, no upload.

Binary Translator

Text to binary, or binary to text — instantly

Fancy Text Generator

15 Unicode styles: bold, script, Gothic & more

Remove Dashes

Remove em dashes from text, or swap them for space or comma

Em Dash Copy

Copy an em dash in one click, plus your OS shortcut

French Verb Conjugator

Full French verb conjugation table, instantly

List Randomizer

Shuffle a list into random order, or split into groups.

Morse Code Translator

Translate text to Morse and back, with audio playback

Quick Spell Check

Free spell checker: US/UK English, private, no autocorrect

Remove Duplicate Lines

Paste a list, get unique lines in the original order

Rhyme Finder

Perfect and slant rhymes for any word, grouped by syllable

Text Math Checker

Spot wrong sums in pasted text, with the right answer

Text Reverser

Reverse text, letters in words or word order, instantly

Upside Down Text

Flip text upside down as you type, then copy and paste it

Text to Outlines

Turn text in your own font into SVG outline paths

Price Quote Generator

Paste items and prices, download a quote PDF

Text to Timeline

Type dates and events, download the timeline as PNG or SVG

Truncate Text

Cut text to a character or word limit, keeping whole words

Vowel Counter

Count vowels, consonants and any letter as you type

Word Unscrambler

Find every word hidden in your letters, with blank tiles

PDF

Pay Stub Redactor

Black out details on a PDF or image

Sign PDF

Add a drawn or typed signature

PDF Stitcher

Merge several PDFs into one

Photos to PDF

Combine photos into a PDF

PDF Text Extractor

Copy clean text out of any PDF

Scanned PDF to Text

OCR scanned PDFs to text — free, no upload, no sign-up

PDF Stamper

Watermark every page with custom text

Replace PDF Pages

Swap pages with those of another PDF

PDF Batch Compiler

Fill a PDF form from a CSV — one PDF per row

Rotate PDF

Turn a PDF 90° — all pages or just one

Markdown to PDF

Turn Markdown into a clean, themed PDF

Invoice Generator

Make a PDF invoice — no sign up, no watermark

Document to EPUB

DOCX, Markdown, HTML or TXT → EPUB ebook

Citation Generator

Format APA, MLA & Chicago citations — free, no signup

Vectorize PDF

Trace a raster PDF into a scalable SVG vector

Crafts

Fabric Gathering Calculator

Test swatch → flat fabric to cut for gathers & ruffles

Stitch Counter

Free stitch counter online for knitting & crochet

Data

Any to CSV

Excel & JSON → CSV — comma, semicolon or tab

Data to Chart

Paste data, get an instant chart. Bar, line, pie, scatter.

Data to Excel

CSV, JSON & TSV → Excel (.xlsx), free in your browser

PDF to Spreadsheet

Extract PDF tables to CSV or Excel — free, no upload

Smart Sheet to Tab

MusicXML/MIDI to guitar tab — no impossible chords

Dev & Web

Datetime String Generator

Copy the current time as SQL, ISO 8601 or Unix timestamp

Acronym Decoder

Expand acronyms & abbreviations — tech to slang

Barcode Scanner

Scan barcodes & QR codes with your camera. Free, no app.

Code Formatter

Format & beautify code — JS, JSON, HTML, CSS, Python

Base64 Converter

Encode text to Base64, or decode Base64 back — instantly

Bulk Email Validator

Paste text → extract, dedupe & validate email addresses

CSS Button Generator

Design a button, copy the HTML and CSS or Tailwind code

CSS Grid Generator

Draw grid areas, copy the CSS grid and HTML code

Center Div Generator

Center a div with Flexbox, Grid, or Absolute — copy the CSS

CSS Autoprefixer

Paste CSS, get instant vendor-prefixed output. Free.

CSS Minifier

Minify CSS online: strip comments & whitespace. Free.

Email Header Analyzer

Read email headers: true sender, SPF/DKIM/DMARC, route

File Font Finder

List the fonts and colors a PDF, SVG or CSS file uses

Fluid Type Scale

Fluid type scale as CSS clamp() variables

Grid Generator

Make a transparent grid PNG, SVG or CSS background

Header Parser

Raw HTTP & email headers to a filterable table or JSON

Hex to Decimal

Convert hex to decimal exactly, at any size

JS Deobfuscator

Unpack string arrays and tidy obfuscated JavaScript

JS to TS Converter

Convert JavaScript to TypeScript, PropTypes to interfaces

JSON Formatter

Pretty-print JSON, keep exact numbers, find errors

JSON Stringifier

Turn a JavaScript object into strict, escaped JSON

JSON to POJO Converter

Turn JSON into Java classes or records, with Jackson/Gson

JSON Schema Validator

Check JSON against a schema; every error with its path

JSX to JS Converter

Compile React JSX to plain JavaScript, in your browser

Finance

Break-Even Calculator

Fixed & variable costs + price → break-even point + chart

CAGR Calculator

Start & end value → annualized return (CAGR)

Amortization Calculator

Loan amount, rate, term → payment + full schedule

Loan Payoff Simulator

Balance, APR, payment → payoff time + interest chart

Loan Payoff Calculator

Balance, APR, payment → debt-free date + interest saved

Loan Payment Calculator

Monthly loan payment, total interest & extra-payment payoff

Cost Per Wear Calculator

Price ÷ wears → true cost per wear + comparison

Compound Interest Calculator

Balance, contributions & rate → future value + chart

Daily Interest Calculator

Balance & APR → daily, monthly, yearly interest

Inflation Calculator

Amount, years, rate → future cost or buying power

Fair Bill Splitter

Split a bill by item, tax and tip shared fairly

Real Return Calculator

Inflation-adjusted rate of return from nominal return

ROI Calculator

Total ROI, net profit and annualized return from two numbers

Profit Margin Calculator

Cost + selling price → gross profit, margin % and markup %

Fair Share Calculator

Split rent or bills in proportion to each person's income

Fuel Cost Calculator

Trip or commute fuel cost from MPG, L/100 km or km/L

Proportional Bill Splitter

Work out what you owe for your items, with tax and tip

DIY & Trades

Compressed Insulation Calculator

Effective R-value of batt insulation squeezed into a cavity

Conduit Fill Calculator

Conduit fill % calculator — EMT, PVC, Cat6, THHN

Kerf Bending Calculator

Kerf cut count and spacing to bend wood to a radius

Water Cement Ratio Calculator

Exact water for a target w/c ratio, or check a poured mix

Games

Gameboy ROM Player

Play Game Boy & Game Boy Color ROMs in the browser

Blueprint Mirror

Flip a Factorio blueprint string horizontally or vertically

Random

Bracket Generator

Single-elimination bracket from a list of names

Bulk Coin Flipper

Flip a coin 100 times online — get the full sequence

Random Name Picker

Instant random name picker — no spinning wheel

Gamertag Generator

Unique gamertags, no ugly number suffix — 4 vibes

Markov Chain Generator

Paste text, generate new text that mimics its style

Meme Generator

Add bold top and bottom text to a photo, no watermark

Random Number Generator

Random numbers with no repeats, custom ranges & decimals

Rap Name Generator

Turn your real name into a rap name

Spin the Wheel

Type your options, spin the wheel, get a fair random pick

Weighted Pros & Cons

Weigh pros against cons and see which side wins

Hardware

Keyboard Tester

Test keys for dead keys, ghosting & rollover

Pure Red Screen

Red screen test for dead pixels & OLED burn-in

Refresh Rate Test

Live monitor Hz test with a frame-time graph

SATA Power Pinout

Select a pin for its voltage, wire color & test tip

Screen Mouse Jiggler

Trick an optical mouse into keeping your PC awake

Screen Ruler

Drag to measure pixel distance, size & angle

Virtual Keyboard

On-screen keyboard — click keys to type, then copy the text

Webcam & Mic Test

Preview your camera, watch your mic, hear yourself back

Food & Drink

ABV Calculator

Instant ABV from OG & FG — beer, wine, mead, cider

Coffee Ratio Calculator

Type coffee or water — the other calculates instantly. Free.

Oat Ratio Calculator

Oats to water or milk, in cups or grams, for any style

Recipe Scaler

Halve, double or scale any pasted recipe

Brewing Water Calculator

Salt and acid additions plus estimated mash pH for brewing

Salt Calculator

Salt in grams for sauerkraut, kimchi and brine by weight

Math & Geometry

3D Surface Plotter

Plot z=f(x,y) as a rotatable 3D surface — free, no signup

Circle Area Calculator

Circle area from radius, diameter, or circumference.

Circle From 3 Points Calculator

Circle equation, center & radius from any 3 points.

Basic Calculator

Four-function calculator: correct order of operations, free

Basic Math Flashcards

Endless math flashcards: add, subtract, multiply, divide

Circle Skirt Calculator

Waist radius, hem radius & fabric yardage for circle skirts

Complex Function Plotter

Plot any complex function f(z) as a domain coloring

Conversion Rate Calculator

Sessions and sales in, conversion rate % out.

Cylinder Volume Calculator

Cylinder volume in liters and gallons from width and height

Derivative Calculator

Exact derivative as you type, plus its value at a point

Function Slope Calculator

Tangent line y = mx + b and slope at a point, as you type

Expression Calculator

Type a whole math problem, see the answer as you type

Factor Quadratics Calculator

Factor ax² + bx + c into brackets, with every step shown

Imaginary to Polar

Convert a + bi to polar r∠θ and back, in radians or degrees

Final Grade Calculator

Score you need on the final to reach your target grade

Graphing Calculator

Plot up to 5 functions, Cartesian or polar

Hours Calculator

Hours worked between two times, minus break, in decimal

Interactive Unit Circle

Drag a point to see sin, cos and tan on a unit circle

Minecraft Circle Generator

Block-by-block circle plan with row coordinates

Monte Carlo Simulator

Random trials, fan chart and 5th/median/95th percentiles

Parts Calculator

Turn a mix ratio into cups, fl oz or ml for any batch

Percentage Calculator

X% of Y, what % X is of Y, and % change as you type

Printables

Batch Sudoku Generator

Printable Sudoku puzzle books with answer keys

Handwriting Worksheet Generator

Turn any text into printable handwriting worksheets

Printable Calendar Maker

Generate and print monthly, yearly, or blank calendars

Visual Checklist Generator

Turn a task list into a printable icon checklist

Visual Schedule Maker

Turn a text list into a printable picture schedule

Word Search Generator

Turn a word list into a printable puzzle with an answer key

Science & Nature

Centripetal Acceleration Calculator

Centripetal acceleration calculator: instant m/s² & g-force.

Country Size Compare

Drag country outlines to compare their true size on a map

Earth Curvature Calculator

Horizon distance, drop & hidden height from curvature.

Easter Date Calculator

Easter Sunday's date for any year, Gregorian or Orthodox

Escape Velocity Calculator

Escape velocity from mass & radius, with planet presets

Golden Hour Calculator

Morning & evening golden hour times, with live countdown

Moon Phase Calculator

Moon phase, illumination % & age for any date, instantly.

Moon Phase Calendar

Moon phase for any month, with dark sky days highlighted

Star Trail Calculator

Longest shutter speed before stars trail: 500 & NPF Rules.

Sunrise & Sunset Times

Sunrise, sunset, daylight hours and twilight for any place

Terminal Velocity Calculator

Terminal velocity in m/s and km/h from mass, area and drag

Time Dilation Calculator

Moving vs stationary clock time at near-light speed

Timers & Clocks

Shower Timer

Big countdown, interval chimes, loud alarm at zero

Breathing Pacer

Box breathing timer — box, 4-7-8, resonant & custom.

Countdown Clock

Countdown clock to any date — share it as a link

Countdown Timer

Countdown timer — presets, alarm sounds, auto-repeat

Fasting Timer

Set a goal, watch a ring fill toward it — 16:8, OMAD

Interval Beeper

A repeating beep at your exact interval — free, no sign-up

Interval Timer

Tabata & HIIT interval timer — presets, voice cues

Pomodoro Timer

Full-screen pomodoro timer with presets & pink noise

Posture Pomodoro

Work timer with a posture or stretch reset at every break

Precision Timer

Millisecond stopwatch and countdown that stays exact

Simple Stopwatch

Online stopwatch with laps, split and total times

Visual Timer

Shrinking pie or ring timer, no numbers, silent mode

Health & Fitness

Barbell Plate Calculator

Plates to load per side, any bar or set, lb/kg.

Calories Per Dollar Calculator

Calories ÷ price → calories per dollar, as you type

Beer Calorie Calculator

Beer calories from ABV & serving size, or homebrew OG/FG.

Beta Carotene Converter

Beta-carotene to bioavailable retinol (RAE) & daily value

Cycling Power Calculator

Estimate cycling watts & calorie burn from speed & weight

Bike Gear Calculator

Gear ratio, gear inches & cassette jump calculator

Bike Tire Pressure Calculator

Instant front/rear PSI & BAR from weight, width, surface.

BMI Calculator

Adult BMI in metric or imperial, with WHO category

BMR Calculator

Resting calories per day, Mifflin-St Jeor

MRV Calculator

Muscle, size, strength class, age → weekly MRV in sets

Body Fat Calculator

Body fat % from tape measurements (US Navy method)

Bra Size Calculator

Six tape measurements to your UK and US bra size

Daily Coffee Counter

Log each cup and watch the ring fill to your daily limit.

IBU Calculator

Beer IBU from hop additions — Tinseth or Rager

Lean Mass Calculator

Lean body mass from body fat %, or Boer, James, Hume

Macro Calculator

Daily calories + protein, carbs, fat for a cut or bulk

Pupillary Distance Meter

Measure your PD in mm with your camera and a bank card

Max Heart Rate Calculator

Max heart rate by age + 5 zones: Tanaka, Fox, Gellish

One Rep Max Calculator

Estimate your 1RM from any set, with training percentages

Units

Conversion Chart Maker

Any-unit conversion table, plus cups-to-grams for baking

Cooking Measurement Converter

Convert cups, tbsp, mL & oz — plus grams by ingredient

Dilution Ratio Calculator

Ratio + one amount → exact concentrate & diluent. Free.

Fraction Multiplier

Multiply fractions & mixed numbers, with the steps shown

Gasoline Equivalent Calculator

Convert kWh, diesel, propane, BTU & more to GGE

Paper Weight Converter

Convert GSM to lb bond, text, cover and points

Measurement Converter

Type a measurement, see every metric and imperial match

Repeating Decimal to Fraction

Repeating decimal to exact fraction, with the algebra steps

Temperature Converter

Celsius, Fahrenheit, Kelvin: readings and changes

Every tool runs in your browser — no upload, no account, free.