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.
  • 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

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 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 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 — 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.
  • 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 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 — no tracking, 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

  • Random Color Generator Color — Generate random colors — completely random, or within a mood.
  • Random Date Generator Generators — Generate random dates within a range — useful for test data.
  • Random Number Generator Generators — Draw random numbers in any range, with or without repeats.
  • Random Picker Generators — Pick a winner — or several — from a list of names or options.
  • Random String Generator Developer — Generate random IDs, tokens and keys from an alphabet you choose.
  • Random Team Generator Generators — Split a list of people into balanced random teams.
  • Ratio Calculator Calculators — Simplify ratios, scale them up, and solve for a missing value.
  • Readability Checker Text — Flesch reading ease, grade level and the numbers behind them.
  • Reading Time Calculator Text — Estimate how long your text takes to read at any reading speed.
  • Regex Escape Developer — Escape a literal string so it can be dropped into a regular expression safely.
  • Regex Tester Developer — Test a regular expression against sample text and see every match highlighted.
  • Remove Accents Text — Convert accented characters to their plain ASCII equivalents.
  • Remove Duplicate Lines Text — Strip repeated lines from a list, keeping the order you had.
  • Remove Empty Lines Text — Delete blank lines, or collapse runs of them into one.
  • Remove Extra Spaces Text — Collapse double spaces and trim the edges of every line.
  • Remove Line Breaks Text — Join wrapped text back into one flowing paragraph.
  • Remove Punctuation Text — Strip punctuation and symbols, leaving letters, numbers and spaces.
  • Reorder PDF Pages PDF — Rebuild a PDF with the pages in exactly the order you specify.
  • Reverse PDF Page Order PDF — Flip a PDF back to front — handy after a reverse-order scan.
  • Reverse Text Text — Flip text backwards by character, word or line.
  • RGB to HEX Converter Color — Convert RGB values into hex codes, one line at a time.
  • Right Triangle Calculator Calculators — Pythagoras, angles, area and perimeter from any two sides.
  • Robots.txt Generator Web & SEO — Build a robots.txt file that says exactly what you mean.
  • ROI Calculator Calculators — Return on investment, plus the annualised rate over your holding period.
  • Roman Numeral Converter Units — Convert numbers to Roman numerals and back again.
  • ROT13 Encoder Text — Apply the classic ROT13 letter rotation — run it twice to undo it.
  • Rotate PDF PDF — Turn pages the right way up — all of them, or just the ones you pick.
  • Round Image Corners Image — Give an image soft rounded corners with a transparent background.
  • Running Pace Calculator Calculators — Convert between pace, speed and finish time for any distance.

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 — 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

  • Unicode Character Inspector Developer — Break text into code points and see what each character really is, byte for byte.
  • Unix Timestamp Converter Developer — Convert between Unix timestamps and human-readable dates, both ways.
  • Uppercase Converter Text — Convert any text to UPPERCASE instantly.
  • Upside Down Text Text — Flip text ʇxǝʇ using Unicode look-alikes.
  • URL Decoder Developer — Turn percent-encoded text back into readable characters.
  • URL Encoder Developer — Percent-encode text for safe use in URLs and query strings.
  • URL Slug Generator Web & SEO — Turn a title into a clean, SEO-friendly URL slug.
  • User Agent Parser Developer — Read a user-agent string, or inspect your own browser’s.
  • Username Generator Generators — Generate available-sounding usernames and handles.
  • UTM Link Builder Web & SEO — Build tagged campaign URLs that analytics tools can actually read.
  • UUID Generator Developer — Generate cryptographically random version-4 UUIDs in bulk.

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

  • 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