Execution stays in the browser.
Every tool is a vanilla ES module that runs in your own runtime. We never see inputs, outputs, or metadata.
145 tools · 13 categories · runs offline
Tools that stay fully in your browser.
A toolbox of vanilla ES modules for AI agents. Every tool runs locally — inputs, outputs, and runtime stay on your device. No API keys, no accounts, no data uploads.
Three principles
Read every line before you run it.
No minified blobs, no telemetry, no obfuscation. The source is the manifest — fetch, inspect, import.
Designed for programmatic use.
A single /api/manifest.json describes every tool. Agents fetch, load, execute — no human in the loop.
The full toolbox.
Organised by what they do — text, image, audio, video, security, and more. Every tool is an ES module you can import and call programmatically.
AI & ML Tools 6 tools
Confusion Matrix Calculator
Enter confusion matrix values to calculate accuracy, precision, recall, F1
K-Means Clustering
Cluster N-dimensional CSV data with K-Means++ and silhouette scoring
K-Means Clustering Tool
Paste 2D CSV data and visualize K-Means clustering
Linear Regression & Feature Correlation
Fit OLS multivariate linear regression with R-squared and correlations
Linear Regression Analyzer
Fit a linear regression to 2D data with visualization
Naive Bayes Text Classifier
Train a Multinomial Naive Bayes text classifier and predict
Design Tools 7 tools
Browser Paint with Smart Palette
Draw and paint with an intelligent color palette
Color Contrast Checker (WCAG)
Test text/background pairs against WCAG AA and AAA
Color Palette Extractor
Extract dominant colors from any uploaded image
Image Color Picker
Upload an image and click any pixel to get exact color values
Image Histogram Viewer
View RGB color histograms and luminance distribution for images
Organic Random Shape Generator
Generate unique organic blob shapes as SVG paths
SVG Optimizer & Analyser
Strip editor metadata from SVG, reducing file size
Developer Tools 18 tools
Base64 Media Encoder / Decoder
Encode any file to Base64 data URI or decode back
Color Format Converter (HEX / RGB / HSL)
Convert colors between HEX, RGB, HSL, and CSS named colors with live preview
Cron Expression Parser & Builder
Parse cron expressions into human-readable schedules and build cron syntax
CSV Auto-Profiler
Profile CSV columns: types, nulls, distributions, outliers
CSV Delimiter Detector
Auto-detect comma, tab, semicolon, or pipe delimiters
CSV to JSON (Flattened)
Convert CSV rows into flat JSON arrays or objects
Epoch Timestamp Batch Converter
Convert multiple Unix timestamps to human-readable dates
Image to Base64
Encode images to Base64 strings for embedding in code
JavaScript ES6 Vanilla Syntax Validator
Validate ES6+ JavaScript syntax without execution
JSON Formatter & Validator
Format, validate, and syntax-highlight JSON data
JSON Key Sorter (Deterministic Order)
Sort JSON object keys alphabetically for consistent diffs
JSON Validator, Beautifier & Minifier
Validate, pretty-print, or minify JSON strings
Open Graph Meta Tag Generator
Build Open Graph tags for link previews on social media
Regex Tester & Explainer
Test regex patterns with token-by-token explanations
Sensor CSV Trend Detector
Find trends and anomalies in time-series sensor CSVs
URL Encoder / Decoder
Encode and decode URLs, parse query parameters, decompose URL components
UUID Generator + Validator
Generate v1/v4/v7 UUIDs and validate existing ones
What Is My User Agent?
See your browser user agent string and parsed details
File Converters 6 tools
Image Compressor
Reduce image file size while keeping quality
Image Converter (JPG ↔ PNG)
Convert between JPG, PNG, and WebP formats with quality control
Image Resizer
Resize images to exact pixel dimensions
SVG to PNG Converter
Paste SVG markup and download it as a PNG at any resolution
TXT to PDF Converter
Turn plain text into a downloadable PDF
TXT ↔ DOCX Converter
Convert between TXT and DOCX without uploading anywhere
Math Tools 8 tools
Derivative & Integral Calculator
Calculate numerical derivatives and definite integrals
Fourier Series Visualizer
Visualize Fourier series approximation of common waveforms
Matrix Calculator
Perform matrix operations: multiply, transpose, determinant, inverse
Matrix Operations Suite
Determinant, inverse, transpose, eigenvalues, LU decomposition, rank
Numerical Differentiation
Compute 1st-3rd derivatives numerically and find critical points
Numerical Integration (Definite Integrals)
Definite integrals via Simpson's, trapezoidal, and Gaussian quadrature
Statistics Significance Tester
Run Z-test, T-test, and chi-square hypothesis tests
Taylor Series Expansion
Taylor series coefficients and polynomial comparison
Media Tools 10 tools
Audio Frequency Visualizer
Upload an audio file and visualize its frequency spectrum
Audio Waveform Analyser
Parse WAV audio: sample rate, channels, peak/RMS amplitude
GIF Frame Extractor
Upload an animated GIF and extract individual frames as PNG
Image Metadata Analyser
Analyse image dimensions, colors, brightness, and palette
MP3 Audio Effects
Apply reverb, pitch shift, and EQ to MP3 files in-browser
MP3 Trimmer
Trim and cut MP3 audio clips without re-encoding
Neural Network Pi Sound Generator
Generate tones from neural network computations on Pi
Text to Audio Morse Code (MP3)
Convert text to audible Morse code, download as MP3
Video Metadata Parser
Detect video container format from file header bytes
YouTube Title Length Checker
Check if your title fits YouTube display limits
Other Tools 2 tools
Physics Tools 12 tools
Circuit Analyzer
Analyze electric circuits: Ohm's law, series/parallel resistance
Electric Circuit Analyzer
Analyze series and parallel circuits using Ohm's law
Electromagnetic Field Calculator
Coulomb's law, Biot-Savart, and RLC circuit impedance analysis
Ideal Gas Law Simulator
Explore the ideal gas law PV=nRT with interactive controls
Orbital Mechanics Calculator
Circular orbits, escape velocity, Hohmann transfers, and Kepler ellipses
Pendulum Calculator
Calculate simple and compound pendulum physics with animation
Pendulum Wave Simulator
Simulate a pendulum wave with adjustable length and gravity
Projectile Motion Simulator
Simulate 2D projectile motion with adjustable angle and velocity
Thermodynamics Calculator
Ideal gas law, Carnot efficiency, heat transfer, and entropy
Wave & Oscillation Analyser
Superpose multiple waves, compute beat frequency and harmonics
Wave Interference Simulator
Visualize two-wave interference patterns with adjustable parameters
Wave Superposition Simulator
Visualize wave interference and superposition of sine waves
Privacy Tools 5 tools
Canvas Fingerprint Detector
Check if your browser canvas is used for tracking
Detect Audio Context Fingerprint
Reveal your AudioContext fingerprint signature
Detect Font Fingerprint
See which installed fonts can identify your browser
Image EXIF Viewer + Remover
Inspect and strip EXIF metadata before sharing photos
Instant Document Cleaner & Redactor
Strip metadata and redact sensitive text from documents
SEO Tools 12 tools
AI / LLM Visibility Checker
Check llms.txt, semantic HTML, and AI-bot rules for LLM discoverability
Canonical URL Checker
Analyze canonical URL declarations for SEO compliance
Content Gap & Semantic Keyword Analyser
TF-IDF keyword extraction and SEO content gap detection
Keyword Density Analyzer
Analyze keyword density for SEO content optimization
LLMs.txt / AI.txt Generator
Generate llms.txt and ai.txt files for AI crawler indexing
Meta Tags SEO Analyzer
Analyze title, description, Open Graph, and Twitter Card tags
OpenGraph & Twitter Card Validator
Validate Open Graph and Twitter Card meta tags
Page SEO Auditor
Full on-page SEO audit: title, meta, headings, images, links, structured data
Robots.txt & Crawl Budget Analyser
Parse and validate robots.txt with crawl budget analysis
Robots.txt Tester
Test whether a URL is allowed or blocked by robots.txt rules
Structured Data (JSON-LD) Validator
Validate JSON-LD structured data for SEO and rich results
XML Sitemap Validator & Analyser
Validate XML sitemaps: URL count, lastmod coverage, structural errors
Security Tools 13 tools
Code Security Auditor
Scan PHP, JS, or Python for SQLi, XSS, command injection, and weak crypto
Entropy & Randomness Analyser
Shannon entropy per byte and high-entropy blob detection
Hash Type Identifier
Paste a hash string to identify its type: MD5, SHA-1, SHA-256, bcrypt
HTTP Header Security Analyser
Score HTTP security headers against OWASP best practices
JWT Decoder & Analyzer
Decode JWT tokens to inspect header, payload, and expiry
Passphrase Generator
Generate strong multi-word passphrases with entropy estimates
Password Generator
Create random passwords with configurable length and rules
Password Strength Analyzer
Comprehensive password strength analysis with entropy calculation
Password Strength Auditor
Audit password strength with entropy and crack-time estimates
Security Headers Checker
Check HTTP security headers for websites
Vulnerability Pattern Scanner
Scan code for common vulnerability patterns
WebGL Fingerprint Detector
See what your GPU and WebGL stack reveal to websites
WebGPU Fingerprint Detector
Check what your WebGPU adapter and GPU reveal to sites
Text Tools 36 tools
Advanced Regex Extractor
Extract, test, and visualize regex matches with named groups
Base64 Text Encoder / Decoder
Encode and decode text as Base64, URL-safe Base64, or Hex
Bulk Text Find & Replace
Run multiple find-and-replace rules on text in a single pass
Citation & Reference Formatter
Format references in APA, MLA, Chicago, or BibTeX
Copy-Paste Cleanup for AI Outputs
Remove hidden formatting from AI-generated or pasted text
Discord Markdown Formatter
Format text with Discord-flavored Markdown syntax
Duplicate Line Finder + Remover
Find and remove duplicate lines from any text block
Email Subject Line Length Checker
Check subject line length for Gmail, Outlook, and mobile
Extractive Text Summarizer
Extractive TF-IDF summarization of long text
Language Detection + Reading Level
Detect language and estimate reading difficulty level
Lorem Ipsum Generator
Generate custom-length lorem ipsum placeholder text
Markdown Previewer
Write Markdown and see rendered HTML in real time
Named Entity Extractor
Extract emails, URLs, dates, phone numbers, hashtags, and IPs from text
Named Entity Highlighter
Auto-detect and highlight emails, URLs, dates, phones, and IPs in text
Prompt Optimizer for LLMs
Score and rewrite LLM prompts for clarity and specificity
Reddit Title Character Counter
Verify your Reddit title fits the 300-char limit
Remove Invisible Characters
Find and strip zero-width and invisible Unicode chars
Resume ATS Formatting Checker (Plain-Text Audit)
Audit plain-text resume formatting for ATS parsers
Smart LaTeX Editor
Write LaTeX math with live-rendered preview
Smart Text Cleaner & Rewriter
Fix spacing, punctuation, and readability issues in text
Structured Data Extractor
Extract key-value pairs, lists, tables, emails, and URLs from text
Text Chunker for RAG / AI Pipelines
Split long text into overlapping chunks for RAG pipelines
Text Color Changer
Apply colors to text and export as HTML or CSS
Text Diff & Patch Visualiser
Word-level diff between two texts with highlighting and statistics
Text Diff Viewer
Compare two texts side-by-side with inline change highlighting
Text Editor
Write and edit plain text in a distraction-free editor
Text Entropy Calculator
Calculate Shannon entropy and character frequency for text analysis
Text Similarity Comparator
Compare two texts and get a similarity percentage
Text Template Filler
Fill Mustache-style templates with JSON data for bulk text generation
Text to Slug Converter
Convert any text to URL slugs or various case formats
TF-IDF Text Summarizer
Extract key sentences using TF-IDF scoring for text summarization
Tone & Sentiment Analyser
Lexicon-based sentiment and tone analysis
Tweet / X Character Counter (incl. link shortening)
Count characters with t.co link shortening applied
WhatsApp Message Formatter
Preview bold, italic, and mono formatting for WhatsApp
Whitespace & Line Cleanup
Strip trailing spaces, extra blank lines, and tabs
Word & Character Counter
Count words, characters, sentences, and paragraphs instantly
Utility Tools 10 tools
Keyboard Typing Rhythm Analyzer
Measure keystroke timing and typing rhythm patterns
QR Code Generator
Generate QR codes from text, URLs, or contact info
QR Scan Reliability Predictor
Predict scan reliability based on size and contrast
Smart Mindmap Generator
Visualize ideas as interactive mindmaps in your browser
Timezone Meeting Overlap Finder (2-4 Zones)
Find shared work hours across 2 to 4 time zones
What Is My Geolocation?
See your latitude, longitude, and accuracy from your browser
What Is My IP Address?
View your public IP address and basic connection info
What Is My Network Information?
Check connection type, downlink speed, and data saver
What Is My Screen Size?
View screen resolution, viewport, and device pixel ratio
What Is My Timezone?
See your timezone, UTC offset, and DST status
How it works
One manifest. No accounts. No keys.
Tools are discovered through a single JSON file, loaded as ES modules, and executed with your input — all in the browser or headless runtime of your choice. No API keys, no authentication.
01
Fetch the manifest
One HTTP request returns the full catalogue of tools, their modules, and their schemas.
02
Import the module
Dynamic import() from your agent's runtime — no bundler, no npm install.
03
Call the function
Pass your input, get the result. Timing is local; the network is never touched.
04
Ship the output
The result is yours. No callback, no quota, no rate limit beyond your own machine.
For AI agents
Programmatic by design.
If you can fetch and import, you can use every tool on the site. No wrappers, no SDK, no auth dance.
// 1. Discover available tools const manifest = await fetch("https://itsfully.online/api/manifest.json") .then(r => r.json()); // 2. Pick one and load it as an ES module const tool = manifest.categories[0].tools[0]; const mod = await import(`https://itsfully.online${tool.clientModule}`); // 3. Execute with your input const result = await mod[tool.execFunction]({ text: " Hello " }); // result stays in your runtime. nothing uploaded.
Also by itsfully.online
A guide to agentic AI in the browser.
Agentic AI in the Browser
Use-Cases for Privacy-First, Browser-Native Agentic Workflows
Published by itsfully.online · First edition — June 2026
$4.99
Get on Gumroad →
Privacy promise
What we don't do matters more than what we do.
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No server storage. Inputs and outputs are processed locally — a few converters (images, PDF/DOCX) run in memory and are discarded. Nothing is persisted.
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No tracking or analytics. No cookies, no fingerprinting, no third-party scripts. Read the source if you'd like proof.
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No accounts, no API keys. Open the page, run the tool. The manifest is a public file; rate limits are your machine's.
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No dependencies. Built on browser builtins — Web Crypto, Canvas, TextDecoder, Fetch. Zero supply-chain risk.