DuckyTools
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A–Z index

All 300+ tools in alphabetical order, with a line on what each one is for.

#ABCDEFGHIJKLMNPQRSTUVWXY

#

  • .env to JSON Developer: Convert environment-variable files into JSON, and back again.

A

  • Add Border to Image Image: Frame a photo with a solid border in any color and thickness.
  • Add Line Numbers Text: Prefix every line with a number, in whatever style you need.
  • Add or Subtract Days Calculators: Find the date a set number of days, weeks or months away.
  • Add Page Numbers to PDF PDF: Stamp page numbers onto a PDF, positioned and styled how you like.
  • Add Prefix and Suffix Text: Wrap every line with text: quotes, commas, tags, bullets.
  • Add Watermark to Image Image: Stamp text across a photo, once, or tiled across the whole thing.
  • Add Watermark to PDF PDF: Stamp DRAFT, CONFIDENTIAL or any text across every page.
  • Age Calculator Calculators: Exact age in years, months, days, and every other unit going.
  • AI Background Remover Image: Cut a subject out of any background with a real segmentation model, running on your own device, not a server.
  • AI Text Cleaner AI & Writing: Strip the giveaways from AI-written text: em dashes, curly quotes, hidden characters and the phrases models overuse.
  • AI Writing Tells Analyzer AI & Writing: Measure the stylistic markers associated with AI writing: dash density, sentence uniformity, overused phrases. Not a detector.
  • aLtErNaTiNg CaSe Text: Turn text into mocking, alternating capitals.
  • Angle Converter Units: Convert degrees, radians, gradians and turns.
  • Area Calculator Calculators: Area and perimeter for rectangles, circles, triangles and more.
  • Area Converter Units: Convert square meters, feet, acres, hectares and more.
  • Aspect Ratio Calculator Calculators: Scale dimensions while keeping the same proportions.
  • Atbash Cipher Text: Mirror the alphabet: A becomes Z, B becomes Y. Its own inverse.
  • Audio File Info Media: Inspect duration, sample rate, channels and peak levels of an audio file.
  • Audio to WAV Converter Media: Convert MP3, M4A, OGG, FLAC and more into uncompressed WAV.
  • Audio Trimmer Media: Cut a section out of an audio file and export it as WAV.
  • Average Calculator Calculators: Mean, median, mode, range and totals from a pasted list of numbers.

B

  • Background Remover Image: Click a background color to erase it, with tolerance and edge feathering you control.
  • Base32 Decoder Developer: Decode Base32 back to text, ignoring padding, spaces and case.
  • Base32 Encoder Developer: Encode text as Base32, the encoding used for TOTP secrets and case-insensitive identifiers.
  • Base64 Decoder Developer: Decode Base64 back to readable text, URL-safe input included.
  • Base64 Encoder Developer: Encode text to Base64, with a URL-safe option.
  • Batch Image Converter Image: Resize, compress and convert dozens of images at once, then download them as a ZIP.
  • Binary Notepad Developer: A hex editor in the browser: open any file, see it as hex, binary or decimal next to the text, edit bytes, insert and delete, search and save.
  • Bitwise Calculator Developer: AND, OR, XOR, NOT and shifts on two numbers, shown in every base.
  • Black and White Image Converter Image: Turn a color photo black and white: grayscale, high contrast or true 1-bit.
  • Blur Image Image: Soften an image, or blur it heavily to obscure something.
  • BMI Calculator Calculators: Body mass index in metric or imperial, with the standard categories.
  • Body Fat Calculator Calculators: Estimate body fat percentage using the US Navy tape method.
  • BPM Tapper Media: Tap along to a track to find its tempo in beats per minute.
  • Break-Even Calculator Calculators: How many units you need to sell before you start making money.
  • Brightness and Contrast Image: Fix a photo that came out too dark, too bright or too flat.

C

  • Caesar Cipher Text: Shift every letter by a chosen amount to encode or decode a message.
  • Calorie and TDEE Calculator Calculators: Daily calorie needs from your BMR and activity level.
  • camelCase Converter Text: Turn any phrase into camelCase for variables and keys.
  • Capitalize Every Word Text: Put a capital letter at the start of every single word.
  • Car Loan Calculator Calculators: Work out car finance payments including trade-in, deposit and sales tax.
  • Character Counter Text: Count characters with and without spaces, plus limits for common platforms.
  • Character Frequency Counter Text: Count how often each character appears, handy for puzzles and ciphers.
  • Character Map Text: Every non-CJK Unicode symbol worth browsing: punctuation, currency, math, arrows, and the Latin, Greek, Cyrillic, Hebrew, Arabic and Devanagari alphabets. Click to copy.
  • Chat Transcript Formatter AI & Writing: Turn a copied chat conversation into clean markdown, JSON messages, or a plain transcript.
  • Circle Crop Image Image: Crop a photo into a perfect circle with a transparent background.
  • Coin Flip Generators: Flip a virtual coin, once or a thousand times.
  • Color Contrast Checker Color: Check text and background contrast against the WCAG accessibility standards.
  • Color Converter Color: Convert a color between HEX, RGB, HSL, HSV and CMYK.
  • Color Mixer Color: Blend two colors and see every step between them.
  • Color Name Finder Color: Find the closest named CSS color to any hex code.
  • Color Palette Generator Color: Build harmonious palettes from one base color.
  • Color Picker Color: Pick a color with sliders and read it back in every format at once.
  • Compound Interest Calculator Calculators: See how savings grow with regular contributions and compounding.
  • Compress PDF PDF: Shrink a heavy PDF by re-rendering its pages at a lower resolution.
  • CONSTANT_CASE Converter Text: Turn any phrase into SCREAMING_SNAKE_CASE for constants and env vars.
  • Convert Image to JPG Image: Turn any image your browser can open (PNG, WEBP, AVIF, GIF, BMP, SVG) into a JPG.
  • Cooking Measurement Converter Units: Convert cups, tablespoons, teaspoons, milliliters and fluid ounces.
  • Credit Card Payoff Calculator Calculators: See how long a card balance takes to clear, and what paying more would save.
  • Cron Expression Parser Developer: Explain a cron schedule in plain English and preview the next run times.
  • CSS Border Radius Generator Color: Shape corners individually and copy the border-radius CSS.
  • CSS Box Shadow Generator Color: Dial in a box shadow visually and copy the CSS.
  • CSS Clamp Generator Color: Generate a fluid clamp() that scales smoothly between two viewport widths, with no media queries.
  • CSS Gradient Generator Color: Design a linear or radial gradient and copy the CSS.
  • CSS Minifier Developer: Strip comments and whitespace from CSS and see the saving.
  • CSV Column Extractor Convert: Pull a single column out of CSV data as a clean list.
  • CSV Delimiter Converter Convert: Swap between comma, semicolon, tab and pipe separated data.
  • CSV to JSON Convert: Convert CSV or TSV into clean JSON, with the delimiter detected for you.
  • CSV to Markdown Table Convert: Turn CSV data into a Markdown table for READMEs, docs and issues.
  • CSV to SQL Insert Convert: Generate INSERT statements from CSV data, ready to paste into a client.
  • CSV to XLSX Convert: Turn CSV or TSV files into an Excel workbook, with one sheet per file and numbers stored as numbers.
  • CSV Viewer Convert: Open a CSV or TSV file as a proper table you can search, sort and scroll, without a spreadsheet app.
  • cURL to Fetch Converter Developer: Paste a curl command and get the equivalent JavaScript fetch call.

D

E

  • Edit Diff Summary AI & Writing: Compare a draft with its rewrite and see exactly what changed, word by word.
  • Electricity Cost Calculator Calculators: What an appliance actually costs to run, per day, month and year.
  • Em Dash Remover AI & Writing: Replace em dashes with commas, periods or plain hyphens: the fastest way to make AI text stop looking like AI text.
  • Emoji Joiner Text: Combine emoji with the zero-width joiner to build flag, family and role sequences, ready to copy.
  • Emoji Remover AI & Writing: Strip emoji from text, including the multi-part sequences that other tools leave half-deleted.
  • Energy Converter Units: Convert joules, calories, kilowatt-hours and BTU.
  • Extract Email Addresses Text: Pull every email address out of a block of text.
  • Extract Numbers Text: Pull every number out of text, and total them up.
  • Extract PDF Pages PDF: Pull specific pages out of a PDF into a new document.
  • Extract URLs Text: Pull every link out of a block of text.

F

  • Fancy Text Generator Text: Turn plain text into bold, italic, script and monospace Unicode styles.
  • Favicon Generator Image: Generate every favicon size from one image, plus the HTML to drop in.
  • File Hash Checker Developer: Verify a download by checking its MD5, SHA-1 and SHA-256, without uploading it.
  • Find and Replace Text: Swap text across your whole document, with optional regex.
  • Fraction Calculator Calculators: Add, subtract, multiply and divide fractions, simplified automatically.
  • Frequency Converter Units: Convert hertz, kilohertz, megahertz, gigahertz and RPM.
  • Fuel Cost Calculator Calculators: Work out what a journey costs in fuel, and split it between passengers.
  • Fuel Economy Converter Units: Convert MPG, liters per 100 km and kilometers per liter.

G

  • GCD and LCM Calculator Calculators: Greatest common divisor and lowest common multiple of any list of integers.
  • Google SERP Preview Web & SEO: See how your title and description will look in search results.
  • GPA Calculator Calculators: Work out a weighted grade point average from your courses.
  • Grade Calculator Calculators: Turn a score into a percentage and a letter grade.

H

  • Hash Generator Developer: Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
  • HEX to RGB Converter Color: Convert one hex code or a whole list into RGB values.
  • Hex to Text Converter Developer: Turn hexadecimal bytes back into readable text, whatever separators they arrived with.
  • HMAC Generator Developer: Sign a message with a secret key using HMAC-SHA256, 384 or 512.
  • Hreflang Tag Generator Web & SEO: Generate a valid, reciprocal set of hreflang tags for a page in several languages.
  • HTML Entity Decoder Developer: Turn HTML entities back into the characters they represent.
  • HTML Entity Encoder Developer: Escape characters so HTML renders them as text instead of markup.
  • HTML Minifier Developer: Remove comments and collapse whitespace in HTML markup.
  • HTML Table to CSV Convert: Paste an HTML table and get clean CSV, Markdown or JSON out of it.
  • HTML to Markdown Convert: Convert HTML back into tidy Markdown source.
  • HTML to Plain Text Developer: Strip every tag and get just the readable text out of HTML.
  • HTTP Status Code Lookup Web & SEO: Look up what any HTTP status code means and when to use it.
  • Hue Rotate Image: Shift every color around the wheel for instant recoloring.

I

  • Image Color Picker Image: Click anywhere on an image to read the exact color under your cursor.
  • Image Compressor Image: Shrink JPG, PNG and WEBP file sizes with a quality slider you control.
  • Image Cropper Image: Drag a crop box over your image, lock it to a ratio, and export the exact region.
  • Image Flipper Image: Mirror an image horizontally, vertically or both.
  • Image Format Converter Image: Convert between PNG, JPEG, WebP, BMP and ICO, with quality, background and icon sizes you control.
  • Image Metadata Viewer Image: See the EXIF data hidden in a photo: camera, timestamps and GPS location.
  • Image Palette Extractor Image: Pull the dominant colors out of any photo as a ready-to-use palette.
  • Image Resizer Image: Resize any image to exact pixels or a percentage, keeping it sharp.
  • Image Rotator Image: Rotate a photo by 90° steps or any angle you choose.
  • Image to ASCII Art Image: Turn a photo into text art you can paste anywhere.
  • Image to Base64 Image: Turn an image into a data URI you can paste straight into CSS or HTML.
  • Image to Text (OCR) Image: Extract text from a photo, screenshot or scan using optical character recognition.
  • Image to WEBP Image: Convert JPG or PNG to WEBP and cut file size by a third.
  • Images to PDF PDF: Turn JPGs and PNGs into a single PDF, one image per page.
  • Inflation Calculator Calculators: See what an amount is worth after years of inflation, in both directions.
  • Inverse Case Converter Text: Swap every uppercase letter for lowercase and vice versa.
  • Invert Image Colors Image: Flip every color to its opposite: a photographic negative.
  • Invisible Character Detector Text: Find the zero-width and look-alike characters hiding in pasted text, and strip them out.
  • IP Subnet Calculator Developer: Work out network, broadcast, mask and usable host range from CIDR notation.

J

  • JPG to PNG Image: Convert a JPG into a lossless PNG.
  • JSON Diff Developer: Compare two JSON documents by structure rather than by line, so formatting never shows up as a change.
  • JSON Flattener Convert: Flatten deeply nested JSON into dot-notation keys, or expand it back.
  • JSON Formatter Developer: Pretty-print, validate and tidy JSON with the indentation you prefer.
  • JSON Minifier Developer: Strip every unnecessary space from JSON and see how much you saved.
  • JSON to CSV Convert: Turn an array of JSON objects into a spreadsheet-ready CSV file.
  • JSON to Query String Convert: Convert a JSON object into a URL query string, and back again.
  • JSON to TypeScript Developer: Turn a JSON sample into TypeScript interfaces you can paste straight in.
  • JSON to XML Convert: Convert a JSON document into equivalent XML markup.
  • JSON to YAML Convert: Convert JSON into readable YAML for configs and pipelines.
  • JSON Validator Developer: Check JSON for errors and get the exact line and column of the problem.
  • JWT Decoder Developer: Decode a JSON Web Token to read its header and payload, locally, always.

K

L

  • Leap Year Checker Calculators: Check whether a year is a leap year, and find the next few.
  • Leetspeak Converter Text: Turn plain text into 1337 5p34k.
  • Length Converter Units: Convert between meters, feet, inches, miles, kilometers and more.
  • Line Counter Text: Count total, non-empty, unique and duplicate lines in any list.
  • List to JSON Array Convert: Turn a pasted list of lines into a JSON array of strings or numbers.
  • LLM Cost Calculator AI & Writing: Work out what an API workload costs per call, per day and per month, at your own prices.
  • LLM Token Counter AI & Writing: Estimate how many tokens a prompt will use, and how much of a context window it fills.
  • Loan Calculator Calculators: Monthly payment, total interest and payoff totals for any fixed-rate loan.
  • Lorem Ipsum Generator Generators: Generate placeholder text by the word, sentence or paragraph.
  • Lowercase Converter Text: Convert any text to lowercase instantly.

M

  • Macro Calculator Calculators: Split a daily calorie target into protein, carbs and fat.
  • Make Image Square Image: Pad any photo into a perfect square, no cropping, nothing lost.
  • Margin and Markup Calculator Calculators: Convert between cost, price, profit margin and markup.
  • Markdown Table Generator Convert: Paste CSV, TSV or pasted spreadsheet cells and get an aligned markdown table.
  • Markdown to HTML Convert: Convert Markdown into clean HTML: headings, lists, links, tables and code.
  • Markdown to Plain Text AI & Writing: Strip the markdown formatting out of AI output and leave clean, pasteable prose.
  • MD5 Hash Generator Developer: Produce the MD5 checksum of any text, instantly.
  • Meme Generator Image: Add classic top and bottom caption text to any image.
  • Merge PDF PDF: Combine several PDFs into one file, in the order you choose.
  • Meta Tag Generator Web & SEO: Generate the complete set of SEO and social meta tags for a page.
  • Morse Code Translator Text: Translate between plain text and Morse code, both directions.
  • Mortgage Calculator Calculators: Work out monthly repayments, total interest and the true cost of a mortgage.

N

  • NATO Phonetic Alphabet Text: Spell anything out as Alfa Bravo Charlie, for phone calls that keep going wrong.
  • Notepad Text: A plain text editor in the browser: open and save .txt files, find and replace, word wrap, and a draft that survives a reload.
  • Number Base Converter Developer: Convert numbers between binary, octal, decimal, hex and any base up to 36.
  • Number Formatter Text: Add thousands separators, fix decimal places, or convert between number formats used in different countries.

P

  • Paint Image: A faithful Paint in your browser: selections, brushes, shapes, curves, text, fill, zoom, rulers, clipboard and undo, saving as PNG, JPEG, BMP or WebP.
  • Paint Calculator Calculators: How much paint a room needs, allowing for coats, doors and windows.
  • Palindrome Checker Text: Check whether a word or phrase reads the same backwards.
  • PascalCase Converter Text: Turn any phrase into PascalCase for classes and components.
  • Passphrase Generator Generators: Generate memorable word-based passphrases that are still hard to crack.
  • Passport Photo Maker Image: Crop a headshot to official passport and ID dimensions at print resolution.
  • Password Generator Generators: Generate strong random passwords using your browser’s secure randomness.
  • PDF Info Viewer PDF: Inspect a PDF: page count, page sizes, metadata and whether it has text.
  • PDF Metadata Editor PDF: Read and rewrite a PDF’s title, author, subject and keywords.
  • PDF to Black and White PDF: Strip the color out of a PDF: cheaper to print, smaller to send.
  • PDF to Images PDF: Render each PDF page as a JPG or PNG at the resolution you choose.
  • PDF to Text PDF: Pull the text layer out of a PDF as a plain text file.
  • Percentage Calculator Calculators: Every common percentage question, answered at once.
  • Percentage Change Calculator Calculators: Measure growth or decline between two numbers.
  • Pixelate Image Image: Pixelate a photo to censor faces, plates and personal details.
  • Placeholder Image Generator Image: Create sized placeholder images for mockups, with the dimensions written on.
  • PNG to JPG Image: Convert PNG to JPG, choosing what fills any transparent areas.
  • Posterize Image Image: Reduce an image to a handful of color levels for a poster-print look.
  • Power Converter Units: Convert watts, kilowatts, horsepower and BTU per hour.
  • Precise Image Cropper Image: Crop by exact pixel coordinates or a fixed aspect ratio, without dragging.
  • Pregnancy Due Date Calculator Calculators: Estimate a due date and see the current stage of pregnancy.
  • Pressure Converter Units: Convert bar, PSI, pascals, atmospheres and mmHg.
  • Prime Number Checker Calculators: Check whether a number is prime and see its factorisation.
  • Print Size Calculator Calculators: How large you can print an image before it looks soft.
  • Prompt Formatter AI & Writing: Wrap prompt sections in XML-style tags, the structure models follow most reliably.
  • Prompt Template Filler AI & Writing: Fill {{variables}} in a prompt template from a list of values, and generate every version at once.

Q

  • QR Code Generator Web & SEO: Create QR codes for links, text, Wi-Fi, contacts and more, with no tracking and no expiry.
  • Quadratic Equation Solver Calculators: Solve ax² + bx + c = 0 with real or complex roots, shown step by step.
  • Query String Parser Developer: Break a URL into its parts and list every query parameter.

R

S

  • Salary Converter Calculators: Convert between hourly, daily, weekly, monthly and annual pay.
  • Sales Tax and VAT Calculator Calculators: Add tax to a net price, or strip it back out of a gross price.
  • Schema Markup Generator Web & SEO: Generate JSON-LD structured data for rich search results.
  • Screen Recorder Media: Record your screen or a single window straight to a video file.
  • Secret Santa Generator Generators: Draw Secret Santa pairings where nobody gets themselves.
  • Sentence Case Converter Text: Capitalize the first letter of every sentence and lowercase the rest.
  • Sentence Counter Text: Count sentences and see average sentence and word length.
  • Sentence Splitter Text: Break a paragraph into one sentence per line, for subtitles, translation, or reading it back critically.
  • Sepia Photo Filter Image: Give a photo a warm, aged sepia tone.
  • SHA-256 Hash Generator Developer: Produce a SHA-256 hash of any text using the browser’s own crypto.
  • Shades and Tints Generator Color: Generate a full lightness ramp from any color, perfect for design tokens.
  • Sharpen Image Image: Bring back edge detail in a slightly soft photo.
  • Shoe Size Converter Units: Convert shoe sizes between UK, US, EU and centimeters.
  • Shuffle Lines Text: Randomize the order of a list: draws, playlists, running orders.
  • Sign PDF PDF: Draw your signature and place it on any page of a PDF.
  • Simple Interest Calculator Calculators: Interest calculated on the original amount only, with no compounding.
  • Smart Quote Converter AI & Writing: Convert curly quotes, dashes and ellipses to plain ASCII, or back the other way.
  • snake_case Converter Text: Turn any phrase into snake_case for databases and Python.
  • Social Media Image Resizer Image: Resize to the exact dimensions each platform wants, in one click.
  • Social Share Preview Web & SEO: Preview how a link will look when shared on social platforms.
  • Sort Lines Text: Alphabetise or numerically sort any list of lines.
  • Speaking Time Calculator Text: Work out how long a script takes to say out loud, for talks, videos and voiceovers.
  • Speed Converter Units: Convert km/h, mph, knots, meters per second and Mach.
  • Split PDF PDF: Break a PDF into separate files: one per page, or in fixed-size chunks.
  • SQL Formatter Developer: Break a long SQL statement onto readable lines with consistent keywords.
  • SQL IN Clause Builder Developer: Turn a pasted list into a ready-to-run SQL IN clause.
  • Standard Deviation Calculator Calculators: Population and sample standard deviation, variance and quartiles.
  • Strikethrough Text Text: Add s̶t̶r̶i̶k̶e̶t̶h̶r̶o̶u̶g̶h̶ or underline that survives a copy-paste.
  • String Escaper Developer: Escape or unescape text for JSON, JavaScript, CSV and shell arguments.
  • Strip Image Metadata Image: Remove EXIF data (GPS location, camera model, timestamps) by re-encoding.
  • SVG to PNG Image: Rasterize an SVG to a PNG at whatever size you need.
  • System Prompt Builder AI & Writing: Assemble a structured system prompt from role, task, rules, format and refusal behavior.

T

  • Temperature Converter Units: Convert Celsius, Fahrenheit, Kelvin and Rankine.
  • Text Diff Checker Text: Compare two blocks of text and see exactly what changed, line by line.
  • Text Repeater Text: Repeat any text as many times as you like.
  • Text to Binary Text: Convert text into 8-bit binary, and binary back into text.
  • Text to Hex Converter Developer: Show text as its hexadecimal bytes, in whichever layout you need.
  • Text Truncator Text: Cut text to a character or word limit without chopping a word in half.
  • Tile Calculator Calculators: Work out how many tiles a floor or wall needs, including the wastage everyone forgets.
  • Time Converter Units: Convert seconds, minutes, hours, days, weeks and years.
  • Time Duration Calculator Calculators: Work out the time between two clock times, across midnight if needed.
  • Time Zone Converter Units: Convert a time between any two zones, with daylight saving handled properly.
  • Tip Calculator Calculators: Work out the tip and split the bill between any number of people.
  • Title Case Converter Text: Capitalize headlines properly, leaving small words alone.
  • Tone Generator Media: Play and download pure test tones at any frequency.
  • Tool Builder Developer: Write your own DuckyTools tool, watch it run, and download it as one self-contained HTML file.
  • Trim Whitespace Text: Remove leading and trailing whitespace from every line.

U

V

  • Video File Info Media: Check a video’s resolution, duration, aspect ratio and size.
  • Video Frame Extractor Media: Scrub through a video and save any frame as a PNG or JPG.
  • Voice Recorder Media: Record audio from your microphone and download it; nothing is uploaded.
  • Volume Converter Units: Convert liters, gallons, pints, cubic meters and cups.

W

  • Water Intake Calculator Calculators: A daily hydration target based on weight, activity and climate.
  • WEBP to JPG Image: Convert modern WEBP images into universally supported JPGs.
  • Weight Converter Units: Convert kilograms, pounds, stones, ounces, grams and tonnes.
  • What Can I Do With This File? Convert: Drop any file to identify what it really is, then jump straight to a tool that can work on it, with the file already loaded.
  • Word Counter Text: Count words, characters, sentences, paragraphs and reading time as you type.
  • Word Frequency Counter Text: See which words you use most, with counts and percentages.
  • Word Wrap Text: Hard-wrap text to a fixed column width, with optional indent and hanging indent.
  • Working Days Calculator Calculators: Count working days between two dates, excluding weekends and holidays.

X

  • XLSX to CSV Convert: Convert an Excel workbook into CSV, one sheet at a time or every sheet at once as a ZIP.
  • XLSX Viewer Convert: Open an Excel workbook in your browser: switch sheets, search, sort by any column and see the formulas behind cells.
  • XML Formatter Developer: Indent XML into a readable tree and check that it parses.
  • XML Sitemap Generator Web & SEO: Turn a list of URLs into a valid XML sitemap.
  • XML to JSON Convert: Parse XML into a JSON structure, attributes included.

Y