Awesome Kitmul

A curated list of 300+ free, privacy-first browser tools that run entirely on your device. No sign-up, no file uploads, no servers.

Kitmul is an open collection of client-side tools powered by JavaScript, WebAssembly, and on-device AI. Every tool runs in your browser — your data never leaves your device.

Available in English, Spanish, French, and German.

---

Contents

• PDF & Document Tools
• Image & Design Tools
• Finance & Business
• Developer & Programming
• Writing & Text Tools
• Data Converters
• Data & Coding Utilities
• Unit Converters
• Math & Calculators
• Date & Time
• Music & Audio
• Video
• AI-Powered Tools
• Agile & Project Management
• Random Generators
• Social Media & SEO
• Sport & Performance
• Education & Science
• Visualizers & Logic
• Image Format Converters
• Blog

---

PDF & Document Tools

Tool	Description	i18n
PDF Merger	Combine multiple PDF files into a single document	ES · FR · DE
PDF Splitter	Split PDF documents into multiple separate files	ES · FR · DE
PDF Watermark	Add text watermarks to PDF documents	ES · FR · DE
PDF Crop	Crop PDF pages to a specific area or size	ES · FR · DE
PDF Flatten	Flatten PDF forms and layers into a single layer	ES · FR · DE
PDF Image Extractor	Extract all images from a PDF document	ES · FR · DE
PDF Image Quality Enhancer	Enhance image quality in PDFs using AI super-resolution	ES · FR · DE
PDF Metadata Editor	View and edit PDF file metadata	ES · FR · DE
PDF Margin Adjuster	Adjust the margins of PDF pages	ES · FR · DE
Image to PDF	Convert images into a single PDF document	ES · FR · DE
Text to PDF	Convert plain text into a professional PDF	ES · FR · DE
PPTX to PDF	Convert PowerPoint presentations to PDF	ES · FR · DE

Image & Design Tools

Tool	Description	i18n
Image Resizer	Resize single or multiple images in bulk	ES · FR · DE
Image Compressor	Reduce JPEG file size while maintaining quality	ES · FR · DE
Compress PNG	Reduce PNG file size while maintaining quality	ES · FR · DE
Compress WebP	Reduce WebP file size while maintaining quality	ES · FR · DE
Compress GIF	Reduce GIF file size while maintaining quality	ES · FR · DE
Image Cropper	Crop images to any size or shape	ES · FR · DE
Image Enhancer	Upscale images using AI super-resolution	ES · FR · DE
Color Palette Extractor	Extract color palettes from any image	ES · FR · DE
Favicon Generator	Create a complete favicon set from any image	ES · FR · DE
Meme Generator	Create memes with custom top and bottom text	ES · FR · DE
Watermark Generator	Add text watermarks to photos	ES · FR · DE
Flyer & Poster Maker	Design flyers and posters with templates	ES · FR · DE
LinkedIn Banner Builder	Create professional LinkedIn banners (1584x396)	ES · FR · DE
Aspect Ratio Calculator	Calculate dimensions and ratios for images and videos	ES · FR · DE
Base64 to Image	Convert Base64 strings to images and vice versa	ES · FR · DE
License Plate Blur	Blur license plates in images using AI	ES · FR · DE

Finance & Business

Tool	Description	i18n
DCA Investment Optimizer	Optimize Dollar Cost Averaging with Softmax-based allocation	ES · FR · DE
Mortgage Calculator	Calculate monthly mortgage payments	ES · FR · DE
FIRE Calculator	Calculate your Financial Independence number and timeline	ES · FR · DE
Retirement Planner	Plan retirement savings with projected growth	ES · FR · DE
Debt Snowball Calculator	Compare snowball and avalanche debt payoff strategies	ES · FR · DE
Credit Card Payoff	Plan your credit card debt payoff strategy	ES · FR · DE
Net Worth Calculator	Track assets and liabilities	ES · FR · DE
Budget Planner (50/30/20)	Plan your monthly budget with the 50/30/20 rule	ES · FR · DE
ROI Calculator	Calculate return on investment	ES · FR · DE
Interest Calculator	Calculate simple and compound interest	ES · FR · DE
Loan Payoff Calculator	Find out when your loan will be paid off	ES · FR · DE
Salary After Tax	Calculate net pay with progressive tax brackets	ES · FR · DE
VAT Calculator	Calculate VAT for any amount and rate	ES · FR · DE
Subscription Tracker	Track recurring subscriptions and find savings	ES · FR · DE
Tip Calculator	Calculate tips and split bills	ES · FR · DE
Discount Calculator	Calculate final price after discounts	ES · FR · DE
Job Offer Comparison	Compare job offers with weighted scoring	ES · FR · DE
Margin & Markup Calculator	Calculate profit margin and markup	ES · FR · DE
Cash Change Calculator	Calculate exact change in bills and coins	ES · FR · DE
Burn Rate Calculator	Calculate startup burn rate and runway	ES · FR · DE

Developer & Programming

Tool	Description	i18n
JSON Formatter	Format, validate, and minify JSON	ES · FR · DE
Base64 Encoder/Decoder	Encode and decode Base64	ES · FR · DE
UUID/GUID Generator	Generate secure UUIDs (v1, v4, v7)	ES · FR · DE
Password Generator	Generate strong, random passwords	ES · FR · DE
URL Encoder/Decoder	Safely encode or decode URLs	ES · FR · DE
HTML Entity Converter	Convert special characters to HTML entities	ES · FR · DE
Chmod Calculator	Calculate Linux file permissions	ES · FR · DE
JS Key Code Finder	Find JavaScript event key codes	ES · FR · DE
HTTP Status Codes	Quick reference for HTTP response codes	ES · FR · DE
MIME Type Lookup	Lookup MIME types for file extensions	ES · FR · DE
Source Map Unpacker	Extract source files from .map files	ES · FR · DE
Infrastructure Diagram	Design infrastructure architecture diagrams	ES · FR · DE

Writing & Text Tools

Tool	Description	i18n
Word & Character Counter	Count words, characters, sentences, and paragraphs	ES · FR · DE
Case Converter	Convert text to UPPERCASE, lowercase, Title Case, etc.	ES · FR · DE
Find and Replace	Find and replace text with regex support	ES · FR · DE
Markdown to HTML	Convert Markdown to clean HTML	ES · FR · DE
Markdown to Medium	Convert Markdown to Medium-compatible rich text	ES · FR · DE
HTML to Markdown	Convert HTML snippets to readable Markdown	ES · FR · DE
Image to Text (OCR)	Extract text from images using OCR	ES · FR · DE
Text Diff Tool	Compare two texts and find differences	ES · FR · DE
Morse Code Translator	Translate text to Morse code and vice versa	ES · FR · DE
Lorem Ipsum Generator	Generate placeholder text	ES · FR · DE
Slug Generator	Generate URL-friendly slugs	ES · FR · DE
String Reverser	Reverse text, words, or lines	ES · FR · DE
Whitespace Remover	Clean up extra spaces in text	ES · FR · DE
Word Frequency Counter	Analyze the most used words in text	ES · FR · DE
PPT Presentation Maker	Create PowerPoint presentations from scratch	ES · FR · DE

Data Converters

Tool	Description	i18n
CSV to JSON	Convert CSV data to JSON and vice versa	ES · FR · DE
XML to JSON	Convert XML data to JSON and vice versa	ES · FR · DE
YAML to JSON	Convert YAML to JSON and vice versa	ES · FR · DE
Excel to JSON	Convert Excel spreadsheets to JSON	ES · FR · DE
CSV to XML	Convert CSV data to XML and vice versa	ES · FR · DE
JSON to HTML Table	Convert JSON into visual HTML tables	ES · FR · DE
SQL Insert Generator	Convert JSON/CSV to SQL INSERT statements	ES · FR · DE
JSON Validator & Lint	Validate JSON syntax with error line numbers	ES · FR · DE
CSV Column Extractor	Extract specific columns from CSV files	ES · FR · DE
JSON Diff	Compare two JSON objects and find differences	ES · FR · DE

Data & Coding Utilities

Tool	Description	i18n
Base Converter (2-64)	Convert numbers between any base	ES · FR · DE
Hex to String	Convert between hexadecimal and plain text	ES · FR · DE
Binary to String	Convert between binary code and plain text	ES · FR · DE
Octal to String	Convert between octal code and plain text	ES · FR · DE
Decimal to String	Convert between decimal code and plain text	ES · FR · DE
ROT13 Encoder	Encode and decode ROT13 cipher	ES · FR · DE
Base32 Encoder	Encode and decode Base32	ES · FR · DE
Atbash Cipher	Encode and decode Atbash cipher	ES · FR · DE
Line Sorter	Sort lines alphabetically, numerically, by length	ES · FR · DE
Empty Line Remover	Remove blank lines from text	ES · FR · DE

Unit Converters

Tool	Description	i18n
Temperature Converter	Celsius, Fahrenheit, and Kelvin	ES · FR · DE
Weight & Mass Converter	Kilograms, pounds, ounces, and more	ES · FR · DE
Length Converter	Meters, feet, inches, and more	ES · FR · DE
Digital Storage Converter	Bytes, KB, MB, GB, TB	ES · FR · DE
Speed Converter	km/h, mph, knots, and more	ES · FR · DE
Km to Miles	Convert kilometers to miles and vice versa	ES · FR · DE
Area Converter	Square meters, acres, and more	ES · FR · DE
Volume Converter	Liters, gallons, cubic meters	ES · FR · DE
Energy Converter	Joules, calories, and more	ES · FR · DE
Pressure Converter	Pascal, bar, PSI, and more	ES · FR · DE
Power Converter	Watts, horsepower, and more	ES · FR · DE
Angle Converter	Degrees, radians, and more	ES · FR · DE
Time Converter	Seconds, minutes, hours, days	ES · FR · DE
Torque Converter	Newton-meters, foot-pounds	ES · FR · DE

Math & Calculators

Tool	Description	i18n
Percentage Calculator	Calculate percentages and percentage changes	ES · FR · DE
Statistics Calculator	Mean, median, mode, standard deviation	ES · FR · DE
Prime Number Checker	Check primality with Rust/WASM for huge numbers	ES · FR · DE
Quadratic Equation Solver	Solve ax2 + bx + c = 0	ES · FR · DE
Fibonacci Generator	Generate Fibonacci sequences	ES · FR · DE
GCD & LCM Calculator	Greatest common divisor and least common multiple	ES · FR · DE
Fraction Calculator	Add, subtract, multiply, divide fractions	ES · FR · DE
Factorial Calculator	Calculate factorials	ES · FR · DE
Percentage Change	Calculate percentage increase or decrease	ES · FR · DE
Average Calculator	Arithmetic, geometric, and harmonic mean	ES · FR · DE
Slope Calculator	Slope, angle, and distance between points	ES · FR · DE
Rule of Three	Solve direct and inverse proportions	ES · FR · DE
Ratio Calculator	Simplify ratios	ES · FR · DE
Absolute Value Calculator	Find the absolute value of any number	ES · FR · DE
Modulo Calculator	Calculate remainder of division	ES · FR · DE
Random Number Generator	Generate random numbers in a range	ES · FR · DE
Palindrome Checker	Check if a number is a palindrome	ES · FR · DE
Sum of Digits	Sum all digits in a number	ES · FR · DE
Reverse Number	Reverse the digits of any integer	ES · FR · DE

Date & Time

Tool	Description	i18n
Age Calculator	Calculate exact age in years, months, days	ES · FR · DE
Unix Timestamp Converter	Convert Unix timestamps to human-readable dates	ES · FR · DE
Business Days Calculator	Calculate working days between dates	ES · FR · DE
Date Difference Calculator	Calculate exact duration between dates	ES · FR · DE
Date Adder	Add or subtract days, weeks, months from a date	ES · FR · DE
Leap Year Checker	Check if a year is a leap year	ES · FR · DE
Stopwatch & Lap Timer	Precise stopwatch with lap timing	ES · FR · DE
Countdown Timer	Set countdown timers	ES · FR · DE
Astronomic Clock	Visualize solar and lunar time	ES · FR · DE
Seconds to HMS	Convert seconds to hours, minutes, seconds	ES · FR · DE
Week Number Calculator	Find the ISO week number of any date	ES · FR · DE

Music & Audio

Tool	Description	i18n
Audio Stem Splitter	Split audio into separate stems in-browser	ES · FR · DE
Vocal Remover	Remove vocals from songs using AI	ES · FR · DE
Voice Noise Remover	Remove background noise from recordings using AI	ES · FR · DE
BPM & Key Detector	Detect tempo and musical key	ES · FR · DE
Audio Trimmer	Clip and trim audio files	ES · FR · DE
Binaural Beats Generator	Generate binaural beats for focus and sleep	ES · FR · DE
Circle of Fifths	Interactive harmonic relationships explorer	ES · FR · DE
Music Scale Library	Explore and listen to musical scales	ES · FR · DE
Polyrhythm Metronome	Practice complex polyrhythms	ES · FR · DE
Tempo Tapper	Calculate BPM by tapping	ES · FR · DE
Noise Generator	Generate white, pink, and brown noise	ES · FR · DE
Sine Wave Sweep	Generate frequency sweeps	ES · FR · DE
ADSR Envelope Designer	Design ADSR envelopes for synthesis	ES · FR · DE
Chiptune Creator	Create retro chiptune music	ES · FR · DE

Video

Tool	Description	i18n
Video Compressor	Compress videos in your browser	ES · FR · DE
Video Trimmer	Trim and cut videos	ES · FR · DE
Video Upscaler	Upscale video resolution	ES · FR · DE
Video to GIF	Convert video clips to GIF	ES · FR · DE
Extract Audio from Video	Extract audio tracks from video files	ES · FR · DE

AI-Powered Tools

Tool	Description	i18n
Background Remover	Remove image backgrounds using AI	ES · FR · DE
Sentiment Analyzer	Analyze toxicity and tone of text	ES · FR · DE
Keyword Extractor	Extract important keywords from text	ES · FR · DE
PII Redactor	Detect and redact personal identifiable information	ES · FR · DE
AI Prompt Generator	Create prompts for Midjourney, Stable Diffusion	ES · FR · DE
Automatic Subtitle Generator	Generate subtitles using local AI	ES · FR · DE
Pose Break Coach	Body movement mini-game with PoseNet	ES · FR · DE
Syllable Counter	Count syllables in text	ES · FR · DE
Text Readability Scorer	Score text readability	ES · FR · DE
Text Tone Analyzer	Analyze the tone of your writing	ES · FR · DE

Agile & Project Management

Tool	Description	i18n
P2P Scrum Poker	Real-time serverless Scrum Poker via WebRTC	ES · FR · DE
Eisenhower Matrix	Prioritize tasks by urgency and importance	ES · FR · DE
Lean Canvas Generator	Build a Lean Canvas with the 9-block layout	ES · FR · DE
RICE Scoring Model	Prioritize backlog with RICE framework	ES · FR · DE
MoSCoW Prioritization	Must/Should/Could/Won't categorization	ES · FR · DE
Kano Model Analysis	Classify features by satisfaction impact	ES · FR · DE
WSJF Calculator	Weighted Shortest Job First prioritization	ES · FR · DE
RACI Matrix	Create responsibility assignment matrices	ES · FR · DE
OKR Tracker	Track Objectives and Key Results	ES · FR · DE
Sprint Capacity Calculator	Calculate team sprint capacity	ES · FR · DE
User Story Mapping	Visual user story maps by release	ES · FR · DE
Fishbone Diagram	Build Ishikawa cause-and-effect diagrams	ES · FR · DE
Team Health Radar	Visualize team health with radar charts	ES · FR · DE
Pomodoro Timer	Customizable Pomodoro for agile workflows	ES · FR · DE
LinkRoutine Planner	Weekly planner stored entirely in the URL	ES · FR · DE
Meeting Cost Calculator	Calculate the real cost of meetings	ES · FR · DE
Cumulative Flow Diagram	Visualize workflow with CFDs	ES · FR · DE
Monte Carlo Forecaster	Probabilistic project delivery forecasting	ES · FR · DE

Random Generators

Tool	Description	i18n
Spin the Wheel	Custom wheel for random results	ES · FR · DE
Dice Roller	Roll virtual dice	ES · FR · DE
Coin Flipper	Flip a virtual coin	ES · FR · DE
Random Name Picker	Randomly select from a list	ES · FR · DE
Random Choice Picker	Pick a random item from options	ES · FR · DE
Team Generator	Split names into random teams	ES · FR · DE
Random Color Generator	Generate colors in HEX, RGB, HSL	ES · FR · DE
Random Quote Generator	Inspirational quotes from famous people	ES · FR · DE
Random Fact Generator	Learn something new with random facts	ES · FR · DE
Rock Paper Scissors	Play against the CPU	ES · FR · DE
Flashcards	Spaced repetition flashcards with SM-2 algorithm	ES · FR · DE
Blue Noise Generator	Mitchell's Best Candidate point distribution	ES · FR · DE

Social Media & SEO

Tool	Description	i18n
Meta Tag Generator	Generate SEO-optimized meta tags	ES · FR · DE
Open Graph Generator	Generate OG meta tags for social sharing	ES · FR · DE
Robots.txt Generator	Create robots.txt for search engines	ES · FR · DE
Sitemap Generator	Generate XML sitemaps	ES · FR · DE
Canonical URL Generator	Generate canonical URL tags	ES · FR · DE
Keyword Density Checker	Analyze keyword density for SEO	ES · FR · DE
Twitter Character Counter	Count characters for Twitter	ES · FR · DE
Instagram Caption Spacer	Add clean line breaks to captions	ES · FR · DE
Ad Character Counter	Character counts for Google/Facebook ads	ES · FR · DE
Hashtag Generator	Generate trending hashtags	ES · FR · DE

Sport & Performance

Tool	Description	i18n
HIIT Workout Timer	Customizable HIIT interval timer	ES · FR · DE
Tabata Timer	High-intensity interval training timer	ES · FR · DE
AMRAP Timer	As Many Rounds As Possible timer	ES · FR · DE
1-Rep Max Calculator	Estimate your one-repetition maximum	ES · FR · DE
Running Pace Calculator	Calculate pace, time, or distance	ES · FR · DE
Wilks Score Calculator	Compare strength across body weights	ES · FR · DE
Plate Loading Calculator	Calculate which plates to load on barbell	ES · FR · DE
Macro Split Generator	Calculate ideal macronutrient split	ES · FR · DE
Vertical Jump Meter	Estimate vertical jump height	ES · FR · DE
Breathing Timer	Intermittent hypoxia breathing exercises	ES · FR · DE
Parkour Combo Generator	Generate random parkour combinations	ES · FR · DE

Education & Science

Tool	Description	i18n
Interactive Periodic Table	Explore chemical elements	ES · FR · DE
DNA to RNA & Protein	Transcribe DNA to RNA and translate to protein	ES · FR · DE
Molar Mass Calculator	Calculate molar mass of chemical formulas	ES · FR · DE
pH Calculator	Calculate pH, pOH, and ion concentrations	ES · FR · DE
Ideal Gas Law	Calculate PV = nRT	ES · FR · DE
Ohm's Law Calculator	Voltage, current, resistance, power	ES · FR · DE
Significant Figures	Identify sig figs and round numbers	ES · FR · DE
Scientific Notation	Convert between decimal and scientific notation	ES · FR · DE
Roman Numerals	Convert decimal to Roman numerals	ES · FR · DE
Multiplication Table	Generate custom multiplication tables	ES · FR · DE

Visualizers & Logic

Tool	Description	i18n
Mermaid Diagram Editor	Create diagrams with Mermaid.js syntax	ES · FR · DE
AST Visualizer	Visualize JavaScript abstract syntax trees	ES · FR · DE
JSON Tree Explorer	Navigate complex JSON structures	ES · FR · DE
CSS Grid Builder	Build CSS grid layouts interactively	ES · FR · DE
Regex Diagram	Visualize regex as railroad diagrams	ES · FR · DE
JWT Decoder	Decode JWT headers and payloads	ES · FR · DE
Binary Search Tree Lab	Interactive BST visualization	ES · FR · DE
Graph Traversal Animator	Animate BFS and DFS	ES · FR · DE
Sorting Algorithms Animator	Visualize sorting algorithms	ES · FR · DE
Quantum Circuit Simulator	Simulate quantum circuits	ES · FR · DE
Big Data Text Visualizer	Visualize large text files efficiently	ES · FR · DE

Image Format Converters

Conversion	Link	i18n
SVG to PNG	Open	ES · FR · DE
PNG to JPG	Open	ES · FR · DE
JPG to PNG	Open	ES · FR · DE
PNG to WebP	Open	ES · FR · DE
WebP to PNG	Open	ES · FR · DE
JPG to WebP	Open	ES · FR · DE
WebP to JPG	Open	ES · FR · DE
PNG to GIF	Open	ES · FR · DE
JPG to GIF	Open	ES · FR · DE
GIF to PNG	Open	ES · FR · DE
GIF to JPG	Open	ES · FR · DE
GIF to WebP	Open	ES · FR · DE
WebP to GIF	Open	ES · FR · DE
SVG to JPG	Open	ES · FR · DE
SVG to WebP	Open	ES · FR · DE
SVG to BMP	Open	ES · FR · DE
SVG to GIF	Open	ES · FR · DE
SVG to PDF	Open	ES · FR · DE
GIF to BMP	Open	ES · FR · DE
GIF to PDF	Open	ES · FR · DE
BMP to GIF	Open	ES · FR · DE
BMP to PDF	Open	ES · FR · DE
ICO to GIF	Open	ES · FR · DE
PDF to PNG	Open	ES · FR · DE
PDF to JPG	Open	ES · FR · DE
PDF to WebP	Open	ES · FR · DE
PDF to GIF	Open	ES · FR · DE
PNG to PDF	Open	ES · FR · DE
JPG to PDF	Open	ES · FR · DE
WebP to PDF	Open	ES · FR · DE
Image Format Converter	Open	ES · FR · DE

---

Blog

• Dollar Cost Averaging: The Strategy That Beats Market Timing Every Time (ES · FR · DE)
• AI agents shouldn't control your apps; they should be the app (ES · FR · DE)
• Why Client-Side Tools Are More Private Than Cloud Alternatives (ES · FR · DE)
• 10 Free Developer Tools You Didn't Know You Needed (ES · FR · DE)
• How to Work with PDFs Without Uploading Your Files (ES · FR · DE)

---

Why Kitmul?

• 100% Client-Side - All tools run in your browser. Your files never leave your device.
• No Sign-Up - No accounts, no registration, no tracking.
• Free Forever - All tools are free with no usage limits.
• 4 Languages - Available in English, Spanish, French, and German.
• AI-Powered - Built-in chat assistant that orchestrates tools via natural language.
• Open Architecture - JavaScript + WebAssembly + on-device AI models.

Contributing

See CONTRIBUTING.md for guidelines on how to suggest new tools, report issues, or contribute improvements.

License

This list is licensed under CC0 1.0 Universal.