Tools & Utilities
156 tools that all work the same way: open the page, do the thing, nothing leaves your browser. Calculators, formatters, a resume builder, PDF utilities, code converters — I built each one because I needed it myself at some point.
Runs in your browser
Every calculation and every format happens in JavaScript, on your machine. There's no server queue you're waiting behind.
Nothing gets uploaded
Resume text, salary numbers, passwords, whatever PDF you dropped in — none of it touches a database. Close the tab and it's gone unless you saved it yourself.
No rate limits
There's no API behind these, so there's nothing to throttle. Refresh, reload, run it a hundred times in a row — doesn't matter.
Money & Tax
Tax, investing and everyday number crunching
ITR & Income Tax
Calculate Old vs New regime tax liabilities, HRA exemptions, Section 80C plans, advance tax installments, and ITR checklists.
Finance Calculators
Calculate compound interest, mutual fund SIP growth, loan EMIs, retirement savings, and inflation.
Stock Market Tools
Track stock returns, average buy price, dividend yields, P/E ratios, and stock broker charges.
General Calculators
Everyday calculators for percentages, dates, age, discounts, sales tax, BMI, and simple math.
Business & Invoicing
Create clean professional invoices, price estimates, and calculate GST bills ready to download as PDF.
Documents & Files
PDFs, images, text and format conversion
PDF Tools
Merge PDF files, compress documents, convert images to PDF, and extract pages without uploading your files.
Unit Converters
Convert length, weight, temperature, digital file sizes, speed, area, and volume with instant accuracy.
Image Tools
Compress images, resize photos, crop pictures, and convert to WebP format right in your browser.
Text Tools
Word and character counter, letter case converters, remove duplicate lines, and text cleaners.
Developer & Web
Code helpers, site tooling and search visibility
Developer Tools
JSON formatters, JWT decoders, Base64 tools, UUID generators, and code helpers.
Web & Design Tools
Color pickers, CSS gradients, box shadow designer, border radius, and web styling utilities.
SEO Tools
Meta tags, robots.txt, XML sitemaps, search previews, and keyword checkers for your website.
Utility Tools
Secure password generators, random number pickers, and date & timestamp converters.
AI & Machine Learning
Model internals, retrieval and AI-assisted work
LLM & Generative AI Tools
Interactive laboratories for tokenization, embeddings, attention matrices, softmax, temperature, and mini language models.
AI Engineering & RAG Tools
Simulate RAG retrieval, vector similarity search, fine-tuning dataset builder, and LLM application architectures.
Machine Learning Laboratories
Interactive visualizations for Gradient Descent, K-Means clustering, Neural Networks, and Confusion Matrices.
AI Productivity
Deterministic-first tools with optional AI assistance for code explanation, SQL generation, and PDF summaries.
Career & Learning
Resumes, writing help and study material
Career Tools
Free resume builder, ATS keyword matchers, bullet point helpers, and job application utilities.
Writing & Language
Grammar checking, plain-English conversions, text rewriting, and structured educational guides.
Education & Learning
Interactive study notes, dynamic quiz generation, flashcard creation, and academic writing outlines.
Personal
Charts, numerology and other personal readings
Popular Utilities
2D Vector Embedding Visualizer
Visualize semantic embeddings in 2D vector space. Compare Cosine Similarity, Euclidean Distance, and semantic clustering.
Browser Image Compressor
Compress JPEG, PNG, and WebP images directly in your browser with zero server uploads.
Build a Mini Language Model in Browser
Train an educational language model on your own text corpus. Inspect vocabulary, forward predictions, training loss, and generate continuations.
CAGR Calculator (Compound Annual Growth)
Determine the smooth annual rate of return for any investment over multiple years.
Capital Gains Tax Calculator (Budget 2024 Rules)
Work out the tax on profits from shares, mutual funds, or property — for both short-term and long-term holdings, under the latest rules.
Color Converter & WCAG Contrast Checker
Convert between HEX, RGB, HSL, and CMYK color models with real-time WCAG accessibility contrast ratios.
All Tools
2D Vector Embedding Visualizer
Visualize semantic embeddings in 2D vector space. Compare Cosine Similarity, Euclidean Distance, and semantic clustering.
Browser Image Compressor
Compress JPEG, PNG, and WebP images directly in your browser with zero server uploads.
Build a Mini Language Model in Browser
Train an educational language model on your own text corpus. Inspect vocabulary, forward predictions, training loss, and generate continuations.
CAGR Calculator (Compound Annual Growth)
Determine the smooth annual rate of return for any investment over multiple years.
Capital Gains Tax Calculator (Budget 2024 Rules)
Work out the tax on profits from shares, mutual funds, or property — for both short-term and long-term holdings, under the latest rules.
Color Converter & WCAG Contrast Checker
Convert between HEX, RGB, HSL, and CMYK color models with real-time WCAG accessibility contrast ratios.
Compound Interest Calculator
Calculate compound growth over time with monthly contributions and custom compounding frequencies.
Confusion Matrix & ML Metrics Calculator
Input True Positives, False Positives, True Negatives, and False Negatives to instantly compute Accuracy, Precision, Recall, and F1-Score.
CSS Box Shadow Generator
Design smooth CSS box shadows with live interactive preview and instant copyable CSS.
Currency Converter
Convert between 15 major world currencies — USD, INR, EUR, GBP, and more — using live exchange rates.
Dividend Yield Calculator
Calculate annual dividend yield percentage and project multi-year passive cash payouts.
Educational Tokenizer Simulator
Interactive educational tokenizer showing character splits, subword boundaries, token IDs, and vocabulary mappings in real-time.
Explain in Simple Language (Layman Converter)
Drop in a contract clause, policy document, or technical paragraph and get back what it actually means, in plain English.
Fine-Tuning Dataset Builder & Validator
Create, validate, and export high-quality fine-tuning datasets in JSONL format for OpenAI, Llama SFT, and conversational ShareGPT formats.
Fine-Tuning vs RAG Architecture Advisor
Interactive decision matrix: answer questions about private facts, latency, formatting, and update frequency for an architectural recommendation.
Free Invoice Generator
Create professional PDF invoices with GST/VAT support, automatic totals, discounts, and custom business branding.
Free Resume Builder & ATS Studio
Pick from 10 templates, fill in your experience, and export a clean PDF that passes ATS parsing — nothing you type leaves your browser.
Google SERP Simulator & Preview
Preview how your webpage title and meta description will look in Google desktop and mobile search results.
Gradient Descent Optimization Game
Interactive optimization game on 2D cost surfaces. Control learning rate to guide parameters to the global minimum without overshooting.
Grammar & Style Auditor
Paste in a paragraph and it flags the grammar mistakes, passive voice, and awkward phrasing — with a fixed version to compare against.
Income Tax Calculator (Old vs New Regime)
See which tax regime — Old or New — saves you more money for AY 2024-25 through 2027-28, including your standard deduction and rebates.
Indian Stock Return & Charges Estimator
Estimate NSE/BSE stock returns after STT, exchange charges, GST, SEBI fees, and stamp duty.
Interactive RAG Pipeline Simulator
Experience full RAG: upload text, configure chunk size and overlap, generate mock embeddings, perform vector search, and synthesize answers.
JPG to PDF Converter
Convert JPG, PNG, and WebP images into high-quality PDF documents with custom page sizes and orientation.
JSON Formatter & Validator
Format, validate, beautify, and minify raw JSON payloads with instant error line pointers.
JWT Decoder (JSON Web Token)
Decode JSON Web Token headers and payloads with expiration status checking.
K-Means Clustering Visualizer
Step-by-step unsupervised K-Means clustering. Generate random 2D points, place K centroids, and watch assignment and update iterations.
Kundli Generator (Janam Patrika)
Generate accurate Vedic birth horoscopes with North and South Indian SVG charts, planetary degrees, and house analysis.
Kundli Matching (36 Guna Milan)
Free Vedic horoscope matching for marriage with Ashtakoota 36 Gunas scorecard, Manglik compatibility, and Nadi analysis.
LLM Application Architecture Builder
Drag-and-drop architectural canvas: assemble Frontend, Prompt Firewalls, Semantic Caches, RAG, Vector DBs, Agents, and Observability.
LLM Generation Simulator
Watch an LLM generate text step by step: Tokenize → Forward Pass → Softmax → Sampling → Append → Repeat.
LLM Token Calculator & Estimator
Estimate token counts, words, characters, and API inference costs across OpenAI, Anthropic, Gemini, and Llama models.
LLM Training Loop Simulator
Simulate training an LLM across multiple epochs: batches, forward passes, cross-entropy loss, and AdamW weight updates with live loss curves.
Loan EMI Calculator & Amortization
Calculate monthly loan EMI payments, total interest payable, and full year-by-year amortization schedules.
Markdown Writer
Write Markdown with a live preview, then export the finished document as PDF, HTML, DOCX or plain Markdown — entirely in your browser.
Merge PDF Online
Combine multiple PDF documents into a single organized file with drag-and-drop page reordering.
Meta Tag Generator & Preview
Generate HTML SEO title, description, canonical, robots, OpenGraph, and Twitter Card tags.
Natural Language to SQL Generator
Describe what you want in plain English and get back a SQL query — review it before pointing anything at production.
Neural Network Binary Classifier Playground
Train a 2-layer neural network in real time to separate 2D datasets (circle, XOR, spiral). Adjust hidden neurons and inspect decision boundaries.
PDF Compressor
Reduce PDF file sizes with customizable compression presets while preserving document readability.
PDF to Word Converter
Convert a text-based PDF into an editable Word (.docx) file entirely in your browser — nothing is uploaded. Preserves detected tables and embedded images.
Percentage Calculator
Calculate percentage of a number, percentage increase/decrease, and proportions.
Portfolio Allocation Calculator
Break down multi-asset portfolios into visual percentage weightings and target asset classes.
QR Code Generator
Generate custom QR codes for URLs, UPI payments, Wi-Fi networks, WhatsApp, vCards, and plain text with SVG/PNG download.
Random Number, Dice, & Coin Flip Generator
Generate random numbers in any range, roll virtual dice (d4 to d20), flip a coin, or get a random yes/no answer.
Resume ATS Keyword Matcher
Paste your resume and the job description side by side and see exactly which keywords you're missing.
Schema Markup Generator (JSON-LD)
Generate valid Schema.org JSON-LD structured data for Articles, FAQs, Organizations, and WebSites.
Secure Password Generator
Generate strong, cryptographically secure passwords with customizable character sets and lengths.
Security Header Checker
Check any public website's HTTP security headers (HSTS, CSP, X-Frame-Options, cookie flags, and more) in seconds.
Self-Attention Heatmap Visualizer
Interactive Scaled Dot-Product Attention matrix. Select any token to view real-time attention weights across the entire sentence.
SEO Audit Tool
Crawl any public page and get a scored, prioritized SEO audit: title/meta, headings, links, images, Open Graph, structured data, and more.
SIP Calculator (Systematic Investment Plan)
Calculate estimated wealth gained and maturity values from monthly mutual fund SIP investments.
SSL/TLS Certificate Checker
Check any domain's SSL certificate validity, expiration date, issuer, and HTTPS/HSTS configuration.
Stock Average Price Calculator
Calculate your weighted average purchase price across multiple stock buys and market dips.
Stock Return Calculator
Compute net profit, absolute return percentage, annualized CAGR, fees, and dividend returns for stock trades.
Study Notes & Flashcards Generator
Paste in a textbook chapter or long article and get structured notes plus flashcards built for actually remembering it.
Text & Code Diff Checker
Compare two blocks of code or text to highlight added, removed, and modified lines side-by-side.
Transformer Layer Architecture Visualizer
Interactive pipeline of a complete Transformer block: Embeddings, RoPE, RMSNorm, Multi-Head Attention, Residual Add, and SwiGLU FFN.
Universal Unit Converter
Convert between units across length, weight, temperature, data storage, speed, area, and volume.
Word & Character Counter
Count words, characters, spaces, lines, paragraphs, and estimate reading/speaking times in real time.
Word to PDF Converter
Convert a Word (.docx) document to a clean PDF in your browser. Text stays selectable; nothing is uploaded. Supports Hindi and Punjabi text.
Advance Tax Calculator & Installment Schedule
Find out if you need to pay advance tax, and when each quarterly installment (15%, 45%, 75%, 100%) is due, so you avoid penalty interest.
Age & Date of Birth Calculator
Calculate exact age in years, months, days, total days lived, and countdown to next birthday.
Area Converter (Sq Meters, Sq Feet, Acres, Hectares)
Convert surface areas between square meters, square feet, square yards, acres, and hectares.
Backpropagation & Gradient Flow Lab
Interactive calculus chain rule simulator: adjust weights and inputs to trace forward outputs, loss, and reverse gradients.
Base64 Encoder & Decoder
Encode plain text to Base64 or decode Base64 strings with UTF-8 and URL-safe options.
BMI Calculator (Body Mass Index)
Calculate Body Mass Index (BMI) using metric or imperial units with standard health category ranges.
Break-Even Calculator
Calculate unit volume and revenue needed to cover fixed and variable business costs.
Capital Gains Tax Estimator (STCG / LTCG)
Estimate Short-Term and Long-Term Capital Gains tax on stock sales with statutory Indian & global rates.
Compress Image to 100KB
Reduce image file size to 100KB or less for online forms, exams, government portals, and web uploads.
Cron Expression Generator & Explainer
Build and translate standard 5-part cron schedules into human-readable English descriptions.
Cross-Entropy Loss Laboratory
Explore Cross-Entropy Loss for next-token prediction. Adjust predicted target probability to see how loss scales logarithmically.
Cryptographic Hash Generator
Compute SHA-256, SHA-384, and SHA-512 cryptographic hashes using the Web Crypto API.
CSS Border Radius Generator
Generate custom CSS border-radius rules with individual corner control and visual preview.
CSS Gradient Generator
Create linear and radial CSS gradients with customizable angle sliders and color stops.
CSV to JSON Converter
Convert CSV spreadsheets and data rows into structured, formatted JSON objects.
Daily Panchang (Vedic Calendar)
Daily Hindu calendar featuring Tithi, Vara, Nakshatra, Yoga, Karana, Rahu Kaal, and Abhijit Muhurat for any global location.
Data Storage Converter (Bytes, KB, MB, GB, TB)
Convert digital storage between Bits, Bytes, KB, MB, GB, TB, and binary KiB, MiB, GiB, TiB.
Date Difference & Duration Calculator
Calculate the exact number of days, weeks, months, and years between any two calendar dates.
Discount & Sale Price Calculator
Calculate final sale prices and total money saved from percentage discounts.
Dividend Reinvestment (DRIP) Calculator
Calculate long-term compound portfolio growth when dividends are automatically reinvested into new shares.
Educational Essay & Outline Studio
Turns a topic into a real essay skeleton — thesis, body arguments, counterpoints, conclusion — a starting outline, not a finished essay.
Emergency Fund Calculator
Calculate recommended 3-month, 6-month, and 12-month emergency savings targets based on living expenses.
Find and Replace Text Tool
Find and replace words, phrases, or regular expressions across multiline text.
Fine-Tuning & LoRA Simulator
Simulate adapting a base model to specialized tasks using LoRA rank parameters. Inspect training curves, overfitting, and behavior changes.
Free Quotation Generator
Create professional business price quotations and estimates with itemized pricing, discounts, and PDF download.
GST Calculator (India)
Calculate inclusive and exclusive Goods and Services Tax (GST) with CGST, SGST, and IGST breakdowns.
Home Loan Tax Benefit Calculator
See how much tax you save each year on your home loan — up to ₹2,00,000 on interest and ₹1,50,000 on principal repayment.
HRA Exemption Calculator
Find out how much of your House Rent Allowance (HRA) is tax-free, based on whether you live in a metro city.
HTML Entity Encoder & Decoder
Encode special characters into HTML entities or decode entities back to readable text.
Image Resizer (Pixel & Percentage)
Resize image dimensions by width, height, or scale factor with aspect-ratio locking.
Image to Text Converter (OCR)
Extract readable, editable text from images, photos, and scanned documents using in-browser WebAssembly OCR. Supports English, Hindi, and Punjabi.
Image to WebP Converter
Convert PNG and JPEG images into lightweight modern WebP format for fast web performance.
Income Tax Slab Calculator
See exactly how much tax you pay at each income slab, for both the New and Old regimes, for AY 2024-25 through 2027-28.
Inflation & Purchasing Power Calculator
Calculate how inflation erodes purchasing power and determine future cost of living.
Interactive Quiz & Assessment Generator
Give it a topic or source text and get multiple-choice questions with answer keys and explanations — a quick self-test.
ITR Document Checklist & Form Selector
Find out which ITR form you need to file — ITR-1, 2, 3, or 4 — and get a checklist of the documents you'll need (Form 16, 26AS, AIS, capital gains).
ITR Refund & Tax Liability Estimator
Compares the tax you actually owe against what's already been deducted (TDS, advance tax, TCS) to tell you if you get a refund or owe more.
Job Description Keyword Extractor
Paste a job posting and see the skills, tools, and qualifications it actually asks for, ranked by how often they show up.
JSON to CSV Converter
Convert structured JSON arrays of objects into clean, downloadable CSV tabular format.
Keyword Density & Frequency Checker
Analyze single and multi-word phrase frequencies and detect keyword stuffing issues.
Lagna / Ascendant Calculator
Calculate your exact rising sign (Ascendant / Lagna), rising degree, and First House traits based on birth time and coordinates.
Length & Distance Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Line-by-Line Code & Algorithm Explainer
Paste a function, algorithm, or regex you don't want to puzzle out by hand, and get a line-by-line walkthrough.
Linear Regression Interactive Playground
Add data points on a scatter plot and watch the Ordinary Least Squares (OLS) best-fit line, slope (m), intercept (c), and R² update instantly.
LLM API Cost & Pricing Calculator
Calculate estimated monthly API costs based on daily requests, input/output token lengths across GPT-4o, Claude 3.5, and Llama 3.
LLM Context Window Budget Visualizer
Visualize context window usage: System Prompt, User Prompt, Retrieved RAG chunks, Conversation History, and Output capacity.
LLM Parameter & VRAM Calculator
Calculate GPU VRAM requirements for model weights, KV-cache, and activations across FP16, INT8, and INT4 (4-bit) quantization.
LLM Temperature Playground
See how the Temperature hyperparameter flattens or sharpens the sampling probability distribution in real-time.
Lo Shu Grid Calculator
Generate your 3×3 Lo Shu Magic Square from date of birth with Driver, Conductor, Planes of Arrows, and missing numbers.
Lorem Ipsum Placeholder Generator
Generate custom paragraphs, sentences, or word counts of standard mock placeholder copy.
Mangal Dosha / Manglik Calculator
Check for Manglik Dosha in your birth chart from Lagna, Moon, and Venus with intensity levels and cancellation rules.
Nakshatra Calculator
Find your exact Janma Nakshatra (birth star), Pada (quarter), ruling planet, presiding deity, and animal yoni.
Next-Token Probability Predictor
Educational autoregressive next-token predictor showing vocabulary probability distributions and candidate ranking.
Number Base Converter (Binary, Hex, Decimal, Octal, ASCII)
Convert numbers simultaneously between Binary (Base 2), Octal (Base 8), Decimal (Base 10), Hexadecimal (Base 16), and ASCII.
Numerology Calculator
Calculate your Life Path Number, Destiny (Expression), Soul Urge, and Personality numbers with Master Numbers (11, 22, 33).
P/E Ratio Calculator
Calculate Price-to-Earnings valuation ratio and compare against sector averages.
PDF Text Summarizer & Key Points
Paste in long document text and get the actual takeaways back — a summary plus the concrete action items.
PDF to JPG Converter
Extract and convert PDF pages into high-resolution JPG images with individual or bulk ZIP download.
Professional Cover Letter Builder
Fill in the role, the company, and your background, and get a cover letter draft you can edit and send.
Query-Key-Value (QKV) Numerical Playground
Interactive step-by-step matrix laboratory: inspect Q × Kᵀ dot products, division by √d_k, Softmax normalization, and weighted V sums.
Rashi / Moon Sign Calculator
Calculate your Vedic Moon Sign (Chandra Rashi), planetary ruler, element, and emotional characteristics.
Regex Tester & Matcher
Test regular expressions against sample text with live match highlights and capture groups.
Remove Duplicate Lines
Deduplicate line-by-line lists with case-sensitivity and whitespace-trimming options.
Resume Bullet Point Optimizer
Turn "responsible for X" into a bullet that actually says what you did and what happened because of it.
Robots.txt Generator
Create clean, search-engine compliant robots.txt files with custom user-agents and sitemap directives.
Rule of 72 Calculator
Quickly estimate the number of years required to double your money at a given fixed rate of return.
Sade Sati Calculator
Determine whether you are undergoing Saturn's 7.5-year Sade Sati cycle, active phase (Rising, Peak, Setting), and timeline.
Savings Goal Calculator
Find out how much money you need to save every month to reach your target savings goal.
Section 80C Investment Planner
See how close you are to the ₹1,50,000 tax-saving limit across EPF, PPF, ELSS, insurance, and home loan principal.
SEO Slug Generator
Convert article titles and phrases into clean, URL-safe kebab-cased slugs with stop-word filters.
SIP vs Lump Sum Calculator
Compare the projected returns of a one-time lump sum investment against regular monthly SIP investments.
Softmax Activation Visualizer & Calculator
Convert real-valued logits into normalized probabilities. Inspect exponentiation, denominator summation, and temperature scaling.
Sort Lines (Alphabetical & Length)
Sort lists alphabetically (A-Z, Z-A), by line length, or randomize order.
Speed & Velocity Converter
Convert velocity between m/s, km/h, mph, and knots.
Stock Split Calculator
Calculate new share quantity and adjusted stock price after forward or reverse stock splits.
TDS Calculator (Sections 194A, 194J, 194C, 194I)
Work out how much TDS applies to bank FD interest, professional fees, contractor payments, or rent — including the higher rate if you haven't shared your PAN.
Technical & Behavioral Interview Practice
Answer a real interview question, technical or behavioral, and get feedback on what worked and what didn't.
Temperature Converter (Celsius, Fahrenheit, Kelvin)
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) temperature scales.
Text Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case.
Text Cleaner & Whitespace Remover
Remove duplicate spaces, empty lines, HTML tags, and trailing whitespace from raw text.
Text Extractor (Emails, URLs, Numbers)
Extract all email addresses, website URLs, and numbers from unorganized text blocks.
Text Rewriter & Tone Enhancer
Paste a paragraph, pick a direction — tighter, more formal, more engaging — and get a rewrite that keeps your meaning intact.
Token Visualizer & Inspector
Visualize exact token boundaries, byte offsets, and frequency analysis with rich color coding for any text input.
Top-K Sampling Playground
Simulate Top-K truncation filtering. Adjust K to prune unlikely tokens and view re-normalized probability distributions.
Top-P (Nucleus) Sampling Playground
Interactive nucleus sampling. Set cumulative probability threshold P (e.g. 0.90) to see dynamic candidate set selection.
Unix Timestamp Converter
Convert Unix epoch timestamps (seconds & milliseconds) to human dates (UTC & Local) and vice versa.
URL & Query String Parser
Break down URLs into protocol, hostname, port, pathname, hash, and individual query parameters.
URL Encoder & Decoder
Encode special characters into percent-encoded URL format or decode encoded URLs.
UUID / GUID v4 Generator
Generate cryptographically random RFC 4122 compliant version-4 UUID identifiers in batches.
VAT & Sales Tax Calculator
Calculate Gross Amount, Net Amount, and Tax Amount from standard VAT and sales tax percentages.
Vector Search & Nearest Neighbors Lab
Interactive 2D vector database search. Place points, configure a query vector, choose Cosine vs Euclidean distance, and retrieve top-K nearest neighbors.
Vimshottari Dasha Calculator
Calculate your 120-year Vedic Vimshottari Dasha periods with active Mahadasha, Antardasha, and lifetime timeline.
Volume & Liquid Capacity Converter
Convert volumes between milliliters, liters, gallons, quarts, pints, and cups.
Weight & Mass Converter
Convert between milligrams, grams, kilograms, ounces, pounds, and stones with precision.
XML Sitemap Generator
Convert a list of URLs into a validated, standard XML sitemap for search console indexing.
100% Client-Side Privacy
Your financial inputs, JWT tokens, images, and JSON payloads are processed locally inside your web browser. Zero server data retention.
Instant Sub-Millisecond Speed
Pure mathematical algorithms execute without server round-trip latency, giving you instantaneous calculations and visual feedback.
Transparent Math & Logic
Every tool explicitly documents its mathematical formulas, assumptions, step-by-step logic, and working examples.