Free Online Tools for
Students & Professionals
Format, encode, calculate, and transform your data instantly. A privacy-first, ultra-fast productivity suite processed entirely in your browser.
Featured Tools
Our most powerful and frequently used utilities.
A/B Testing Statistical Significance Calculator
Calculate conversion rate uplift, two-tailed Z-scores, and statistical significance confidence for A/B split tests.
AI Prompt Formatter & XML Tag Builder
Format high-performance system prompts using Anthropic-recommended XML tags and structured Markdown delimiters for Claude 3.5 Sonnet and GPT-4o.
Assignment Deadline & Schedule Planner
Break essays, research papers, and homework assignments into structured daily study milestones and writing targets.
Final Grade Calculator
Calculate the exact exam score required to pass your course or earn your target letter grade.
Words to Pages Calculator
Convert word counts to exact document pages based on line spacing, font family, and font size for essays and research papers.
Citation & Bibliography Generator
Generate instant, clean APA 7th, MLA 9th, Chicago, and Harvard references and in-text citations for websites, books, and journals.
CIDR & IPv4 Subnet Mask Calculator
Compute network address, broadcast address, usable IP host ranges, binary notation, and wildcard mask from any IPv4 address and CIDR prefix.
SaaS Unit Economics & CAC / LTV Calculator
Calculate Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), Payback Period, and Rule of 40 score for SaaS businesses.
Trending Now
Schema.org JSON-LD Structured Data Generator
Generate Google Rich Snippet-compatible JSON-LD structured data markup for Articles, FAQs, Software, Products, and Organizations.
AI Embedding Cost & Vector Memory Calculator
Calculate vector embedding generation costs, dimensions, and HNSW Vector DB RAM requirements for RAG architectures.
cURL to Code Converter
Convert raw cURL commands into JavaScript Fetch, Axios, Python Requests, and Go HTTP client code.
Social Media Character Limit Tester
Test copy length in real-time against character and word limits for Twitter/X, LinkedIn, Instagram, Google Ads, and SMS.
Word Frequency Counter & Keyword Density Tool
Analyze word recurrence, unique vocabulary, and keyword density percentages with stop-word filtering.
Color Palette Generator
Generate complementary, analogous, triadic, and monochromatic color palettes with instant CSS export.
UTM Campaign Tracking Link Builder
Generate standardized Google Analytics 4 (GA4) UTM tracking URLs for ads, newsletters, and social media campaigns.
Google SERP Snippet Simulator
Preview how your web page appears on Google Desktop and Mobile search results with pixel width calculations.
Recently Added
PDF Splitter & Page Extractor
Split PDF files and extract custom page ranges locally in your browser with zero server uploads.
AI Background Remover
Remove the background from any image instantly using in-browser Artificial Intelligence. 100% private and free.
Free PDF Invoice Generator
Create, preview, and download professional PDF invoices for your freelance business completely free.
Essay Word Counter & Analyzer
Count words, characters, and paragraphs for your academic essays. Instantly estimates reading level and speaking time.
College GPA Calculator
Calculate your college semester GPA instantly. Add classes, credits, and grades to see your exact 4.0 scale GPA.
Freelance Hourly Rate Calculator
Calculate your required freelance hourly rate based on target annual salary, business overhead expenses, vacation weeks, and billable utilization percentage.
Crypto Profit & Tax Calculator
Instantly calculate your net profit and capital gains tax from cryptocurrency trades.
Cloud Infrastructure Cost Estimator
Estimate and compare monthly cloud infrastructure costs across AWS (EC2), Azure, and GCP including compute instances, block storage, and data egress.
Explore Categories
Find exactly what you need with our organized collections of purpose-built tools.
Student & Academic
APA/MLA citation generator, words to pages, final grade & deadline planners.
AI Engineering
Token counters, prompt formatters, vector embedding calculators & API budgets.
Developer Tools
cURL to code, JSON to TypeScript, Cron builder, CIDR subnets & JSON-LD.
Business & SaaS
SaaS metrics, A/B testing statistical significance, ROI, PayPal & Stripe fees.
Calculators
Mortgage loans, EMI, percentages, compound interest, BMI, and age.
Text & Writing
Word frequency analyzer, character limit tester, diff compare & case converter.
Converters
CSV to JSON, Markdown to HTML, Unix timestamps, and unit conversions.
PDF Utilities
Split PDF page ranges and merge documents client-side with 100% privacy.
Built for modern professionals & students
Most online tools are slow, packed with invasive ads, and upload your sensitive data to remote servers. We built Heptiq to be the exact opposite.
100% Client-Side Processing
Your code, JSON, and data never leaves your browser. Zero server uploads.
Blazing Fast UI
Built with Next.js App Router and optimized for instant load times and zero layout shifts.
Ad-Free Experience
Clean, premium, distraction-free interfaces that let you focus on your work.
// Parsed instantly in-browser
try {
return JSON.stringify(JSON.parse(input), null, 2);
} catch (e) {
return e.message;
}
}
107+
Active Utilities
100%
Free Access
0ms
Server Latency
24/7
Local Availability
Frequently Asked Questions
Everything you need to know about the platform.
Latest Guides
Learn how to maximize your workflow with our in-depth tutorials.
How to Properly Format JSON Payloads for REST APIs
Learn the standard practices for organizing and nesting JSON structures for optimal API transmission and parsing performance.
Understanding Base64 Encoding: A Complete Guide
A deep dive into how binary data is translated into 64 ASCII characters for safe web transport and storage.
The Math Behind Loan Amortization & EMIs
Unpacking the complex formulas that power Equated Monthly Installments and how interest compounds over time.