# DevZone Tools

> Free, fast, privacy-first online tools for developers, designers, and everyone. Includes financial calculators, health tools, developer utilities, and file converters. All tools run entirely in your browser — no sign-up, no data uploads, no tracking.

## Pages

- [Home](https://devzone.tools/): Directory of all 51 free online tools
- [Formatting](https://devzone.tools/formatting): Text formatting and code formatting tools
- [Generators](https://devzone.tools/generators): QR codes, color palettes, passwords, and more
- [Security](https://devzone.tools/security): Developer security and encoding tools
- [Calculators](https://devzone.tools/calculators): Financial, health, and everyday calculators
- [File Converters](https://devzone.tools/file-converters): Convert between PDF, image, and document formats
- [Privacy Policy](https://devzone.tools/privacy): How we handle (or don't handle) user data
- [Terms of Service](https://devzone.tools/terms): Terms governing use of the site
- [About](https://devzone.tools/about): Who built DevZone Tools and why
- [Contact](https://devzone.tools/contact): Email the maintainer with feature requests, bug reports, or accessibility issues

## Calculators

- [EMI Calculator](https://devzone.tools/tools/emi-calculator): Calculate loan EMI, total interest, and amortization schedule instantly
- [Mortgage Calculator](https://devzone.tools/tools/mortgage-calculator): Calculate mortgage EMI, total interest, and full repayment schedule
- [Car Loan EMI Calculator](https://devzone.tools/tools/car-loan-emi-calculator): Calculate auto loan EMI, total interest, and amortization schedule
- [Personal Loan EMI Calculator](https://devzone.tools/tools/personal-loan-emi-calculator): Calculate personal loan EMI, interest, and repayment breakdown
- [Education Loan EMI Calculator](https://devzone.tools/tools/education-loan-emi-calculator): Calculate student loan EMI, total interest, and repayment schedule
- [SIP Calculator](https://devzone.tools/tools/sip-calculator): Calculate future value of monthly SIP investments with compound returns; includes step-up SIP and goal-based reverse calculator
- [Compound Interest Calculator](https://devzone.tools/tools/compound-interest-calculator): Calculate how savings grow with daily, monthly, or annual compounding; includes growth chart and year-by-year schedule
- [Salary Calculator](https://devzone.tools/tools/salary-calculator): Convert hourly wage to yearly salary or annual to hourly; includes overtime and tax estimates
- [Percentage Calculator](https://devzone.tools/tools/percentage-calculator): Calculate percentages, find what percent one number is of another, and more
- [Age Calculator](https://devzone.tools/tools/age-calculator): Calculate exact age in years, months, days, and hours
- [BMI Calculator](https://devzone.tools/tools/bmi-calculator): Calculate Body Mass Index with ideal weight range and health category
- [Body Fat Calculator](https://devzone.tools/tools/body-fat-calculator): Calculate body fat percentage using the US Navy formula or BMI method; includes ideal body fat range and fat loss calculator
- [Calorie Calculator](https://devzone.tools/tools/calorie-calculator): Calculate daily calorie needs, BMR, TDEE, calorie deficit, and macros
- [Aspect Ratio Calculator](https://devzone.tools/tools/aspect-ratio-calculator): Find, simplify, and convert aspect ratios for images, video, and social media
- [GPA Calculator](https://devzone.tools/tools/gpa-calculator): Calculate semester and cumulative GPA across 4.0, 4.3, 5.0 weighted, and India 10.0 CGPA scales
- [Final Grade Calculator](https://devzone.tools/tools/final-grade-calculator): Find out what score you need on your final exam to reach your target course grade
- [Grade Calculator](https://devzone.tools/tools/grade-calculator): Calculate your current course grade from weighted assignments or total points earned
- [GPA Scale Converter](https://devzone.tools/tools/gpa-scale-converter): Convert between percentage, letter grades, 4.0, 4.3, 5.0, and India CGPA scales

## Developer Tools

- [JSON Formatter](https://devzone.tools/tools/json-formatter): Format, validate, and minify JSON with syntax highlighting and tree view
- [Base64 Encoder / Decoder](https://devzone.tools/tools/base64): Encode and decode Base64 strings and files instantly
- [Regex Tester](https://devzone.tools/tools/regex-tester): Test and debug regular expressions with live match highlighting and capture group inspection
- [HTML Entity Encoder](https://devzone.tools/tools/html-entity): Encode and decode HTML entities to prevent XSS and display special characters safely
- [Unix Timestamp Converter](https://devzone.tools/tools/unix-timestamp): Convert between Unix timestamps and human-readable dates across time zones
- [Cron Builder](https://devzone.tools/tools/cron-builder): Build and validate cron expressions with a visual editor and human-readable preview
- [JWT Decoder](https://devzone.tools/tools/jwt-decoder): Decode and inspect JWT tokens — header, payload, and timestamps
- [UUID Generator](https://devzone.tools/tools/uuid-generator): Generate random UUID v4 identifiers; bulk generate up to 100 UUIDs with formatting options
- [Hash Generator](https://devzone.tools/tools/hash-generator): Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files; supports HMAC
- [URL Encoder / Decoder](https://devzone.tools/tools/url-encoder): Encode and decode URLs using percent-encoding; supports full URI, component, and legacy encoding modes
- [JSON ↔ CSV Converter](https://devzone.tools/tools/json-csv-converter): Convert JSON arrays to CSV and CSV back to JSON with custom delimiter and header row control
- [XML Formatter](https://devzone.tools/tools/xml-formatter): Format, minify, and validate XML; convert XML to JSON with one click
- [YAML Formatter](https://devzone.tools/tools/yaml-formatter): Format and validate YAML; convert YAML to JSON or JSON to YAML

## Text & Formatting Tools

- [Word Counter](https://devzone.tools/tools/word-counter): Count words, characters, sentences, paragraphs, and estimate reading time in real time
- [Case Converter](https://devzone.tools/tools/case-converter): Convert text between camelCase, PascalCase, snake_case, kebab-case, UPPER CASE, and more
- [Diff Checker](https://devzone.tools/tools/diff-checker): Compare two blocks of text or code side-by-side and highlight differences
- [Readability Analyzer](https://devzone.tools/tools/readability): Score text readability using Flesch-Kincaid and other standard readability indices
- [Lorem Ipsum](https://devzone.tools/tools/lorem-ipsum): Generate placeholder text by word, sentence, or paragraph count
- [Markdown Editor](https://devzone.tools/tools/markdown-editor): Write Markdown with a live split-pane preview; export as HTML
- [Typing Speed Test](https://devzone.tools/tools/typing-speed-test): Free WPM typing test with multiple durations and difficulty modes; tracks personal best and session history

## Image Tools

- [Image Compressor](https://devzone.tools/tools/image-compressor): Compress JPG, PNG, and WebP images client-side with adjustable quality; no uploads to any server
- [Image to Text (OCR)](https://devzone.tools/tools/image-to-text): Extract text from any image using browser-side OCR
- [HEIC to JPG Converter](https://devzone.tools/tools/heic-to-jpg): Convert HEIC photos from iPhone to JPG or PNG — free and instant
- [Color Palette](https://devzone.tools/tools/color-palette): Extract dominant colors from an image and export palettes as CSS, JSON, or hex
- [SVG Converter](https://devzone.tools/tools/svg-converter): Convert SVG files to PNG, JPG, or WebP at any resolution; export as ICO for favicons
- [CSS Gradient Generator](https://devzone.tools/tools/css-gradient): Create linear and radial CSS gradients with a live preview and one-click copy

## File Converters

- [PDF Tools](https://devzone.tools/tools/pdf-tools): Merge multiple PDFs or extract pages — all in your browser
- [PDF to Word](https://devzone.tools/tools/pdf-to-word): Convert PDF files to editable Word documents (DOCX)
- [PDF to JPG](https://devzone.tools/tools/pdf-to-jpg): Convert PDF pages to high-quality JPG images
- [JPG to PDF](https://devzone.tools/tools/jpg-to-pdf): Convert JPG images to a PDF document; combine multiple photos into one file
- [PNG to PDF](https://devzone.tools/tools/png-to-pdf): Convert PNG images to a PDF document; combine multiple PNGs into one file
- [Image to PDF](https://devzone.tools/tools/image-to-pdf): Convert JPG, PNG, WebP, and other images to PDF; batch convert and combine
- [JSON ↔ CSV Converter](https://devzone.tools/tools/json-csv-converter): Convert JSON arrays to CSV and CSV back to JSON

## Utility & Generator Tools

- [QR Generator](https://devzone.tools/tools/qr-generator): Generate QR codes for URLs, text, or any string; downloadable as PNG or SVG
- [Unit Converter](https://devzone.tools/tools/unit-converter): Convert between units of length, weight, temperature, area, volume, and more
- [Password Generator](https://devzone.tools/tools/password-gen): Generate cryptographically random passwords with configurable length and character sets
- [Random Number Generator](https://devzone.tools/tools/random-number-generator): Generate random numbers in any range; includes dice roller, coin flip, and name picker
- [Online Timer](https://devzone.tools/tools/timer): Countdown timer with presets; includes Pomodoro timer, stopwatch, and multiple simultaneous timers