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DeckTools: 60+ Instant Client-Side Web Utilities

Calculators, converters, developer utilities, SEO helpers and document converters. Every tool executes directly in your browser — your data never leaves your device.

60+ Free Tools 0 Server Latency 100% Private Dark & Light Mode

🔥 Popular & Trending Tools

Finance

GST Calculator

Calculate Goods & Services Tax with separate CGST, SGST, and IGST breakdowns + currency toggles.

Open Tool → Developer

JSON Formatter & Validator

Format, beautify, validate and minify JSON strings with real-time error detection.

Open Tool → Finance

Mortgage / Home Loan EMI

Compute monthly loan EMI, total interest payable and amortization schedules.

Open Tool → Documents

Image Resizer & Compressor

Resize and compress images directly in your browser with local Canvas quality control.

Open Tool →

01. Finance & Investment

10 tools
SC

SIP Calculator

Estimate the future value of monthly Systematic Investment Plan (SIP) contributions with a donut chart.

Open tool → LR

Lumpsum Return Calculator

Calculate the future value of a one-time lump sum investment at a given annual return rate.

Open tool → MH

Mortgage / Home Loan EMI Calculator

Compute monthly EMI, total interest payable and the full amortization schedule for loans.

Open tool → CI

Compound Interest Calculator

Grow your principal with compound interest at any compounding frequency and time period.

Open tool → RC

ROI Calculator

Measure return on investment and annualized ROI from the money you put in and get back.

Open tool → ST

Salary to Hourly Wage Converter

Convert annual salary to hourly, weekly, bi-weekly and monthly wage figures.

Open tool → PC

PPF Calculator

Public Provident Fund maturity and interest calculation for yearly deposits up to 15 years.

Open tool → GC

GST Calculator

Add or remove GST on any amount and instantly see net, tax and gross figures.

Open tool → CP

Crypto Profit & Loss Calculator

Manually enter buy and sell prices to compute your crypto gains or losses.

Open tool → MA

Margin and Markup Calculator

Find margin, markup, cost or selling price when any two pricing inputs are known.

Open tool →

02. Developer Utilities

10 tools
JF

JSON Formatter & Validator

Format, beautify, validate and minify JSON with syntax error reporting.

Open tool → CP

Chmod Permissions Calculator

Convert between symbolic and numeric Unix file permissions instantly.

Open tool → BE

Base64 Encoder / Decoder

Encode and decode Base64 strings, including Unicode-safe handling.

Open tool → HC

HTML/CSS/JS Minifier

Strip comments and whitespace from HTML, CSS and JavaScript source.

Open tool → UG

UUID / GUID Generator

Generate random UUID v4 identifiers in bulk with one click.

Open tool → RM

Regex Matcher & Tester

Test JavaScript regular expressions with live match highlighting and flags.

Open tool → CT

CSV to JSON Converter

Convert CSV text or files into clean JSON arrays with header detection.

Open tool → UE

URL Encoder / Decoder

Percent-encode or decode URL components and full URLs.

Open tool → SK

SSH Key Generator

Generate an RSA-style public/private key pair locally via the Web Crypto API.

Open tool → XT

XML to JSON Converter

Parse well-formed XML and convert it to a JSON object tree.

Open tool →

03. Content & SEO

10 tools
WC

Word, Character & Sentence Counter

Count words, characters, sentences, paragraphs and reading stats in any text.

Open tool → SM

SEO Meta Tag Generator

Generate optimized title, meta description, keywords and Open Graph tags.

Open tool → KD

Keyword Density Analyzer

Analyze keyword frequency and density percentages inside your content.

Open tool → CC

Case Converter

Transform text to UPPER, lower, Title and Sentence case in one click.

Open tool → TT

Text to URL Slug Generator

Create clean, SEO-friendly URL slugs from any headline or phrase.

Open tool → LI

Lorem Ipsum Generator

Generate lorem ipsum dummy text with custom paragraph, sentence and word counts.

Open tool → RD

Remove Duplicate Lines

Deduplicate lines in any text, with optional sorting and trimming.

Open tool → HT

HTML to Markdown Converter

Convert HTML snippets into readable Markdown markup.

Open tool → RT

Reading Time & Speaking Time

Estimate how long it takes to read or speak any block of text.

Open tool → FR

Find & Replace Text

Find and replace text occurrences with optional case sensitivity and regex.

Open tool →

04. Everyday Converters & Productivity

10 tools
PF

Pomodoro Focus Timer

25-minute focus sessions with short and long breaks to power deep work.

Open tool → PC

Percentage Calculator

Find percentages, increases, decreases and what-percent-of questions instantly.

Open tool → AC

Age Calculator

Calculate exact age in years, months, days, hours and more from any birth date.

Open tool → DD

Date Difference Calculator

Days, weeks, months and years between two dates with full breakdown.

Open tool → TZ

Time Zone & Meeting Planner

Compare current times across major world time zones and plan meetings.

Open tool → SP

Secure Password Generator

Generate strong, random passwords with adjustable length and character sets.

Open tool → SC

Scientific Calculator

Full-featured scientific calculator with trig, log, exponential and memory.

Open tool → BS

Bill Splitter & Tip Calculator

Split restaurant bills evenly and calculate tip percentages per person.

Open tool → RT

RGB to Hex Color Converter

Convert between RGB and HEX color formats with a live color preview.

Open tool → AR

Aspect Ratio Calculator

Calculate the missing dimension or the reduced aspect ratio for any size.

Open tool →

05. Health & Lifestyle

10 tools
BC

BMI Calculator

Body Mass Index from height and weight with WHO category feedback.

Open tool → BC

BMR Calculator

Basal Metabolic Rate estimation using the Mifflin-St Jeor equation.

Open tool → TC

TDEE Calculator

Total Daily Energy Expenditure for maintenance, cutting or bulking.

Open tool → CD

Calorie Deficit Calculator

Set a daily deficit and see the projected timeline to reach a weight goal.

Open tool → IB

Ideal Body Weight Calculator

Healthy weight ranges for your height using BMI and Devine formulas.

Open tool → PD

Pregnancy Due Date Calculator

Estimate the due date from the last menstrual period or conception date.

Open tool → BF

Body Fat Percentage Calculator

Estimate body fat percentage using the U.S. Navy circumference method.

Open tool → DW

Daily Water Intake Calculator

Recommended daily water intake based on weight, activity and climate.

Open tool → PS

Pace & Speed Calculator

Compute running pace, speed or time from any two known values.

Open tool → OF

Ovulation & Fertility Calculator

Estimate ovulation day and fertile window from your cycle length and period date.

Open tool →

06. File & Document Converters

10 tools
IF

Image Format Converter

Convert images between PNG, JPG and WebP locally using HTML5 Canvas.

Open tool → IR

Image Resizer & Compressor

Resize and compress images right in the browser with quality control.

Open tool → ST

SVG to PNG/JPG Converter

Rasterize SVG code or files to PNG or JPG using Canvas.

Open tool → EC

Extract Colors from Image

Pull the dominant colors and a palette from any image with Canvas ImageData.

Open tool → TT

Text to Speech Generator

Convert text to spoken audio using the native speechSynthesis API.

Open tool → CT

CSV to Excel / TSV

Parse CSV and export as a downloadable Excel/TSV file via Blob.

Open tool → MT

Markdown to HTML Converter

Render Markdown as clean HTML with a live preview using marked.js.

Open tool → PT

PDF to Text Extractor

Extract raw text from PDF files locally using pdf.js.

Open tool → TT

Text to PDF Generator

Turn plain text into a downloadable PDF document using jsPDF.

Open tool → PM

PDF Merger

Combine multiple PDF files into one document locally with pdf-lib.

Open tool →

No tools match your search query or selected category. Try another filter.

Why Choose DeckTools?

⚡ ~0ms Instant Latency

Calculations and document conversions happen locally in your browser. No server queueing or network delay.

🔒 Complete Privacy

Your inputs, code, salary, health data, and files are processed strictly on your machine and never uploaded.

🌙 Dark & Light Themes

Switch seamlessly between Normal (Light) and Dark themes with full OS system preference auto-detection.

🛠️ 60+ Versatile Utilities

From GST and EMI calculators to JSON formatters, regex testers, image resizers, and PDF extractors.

Frequently Asked Questions

Yes! Every tool on DeckTools is 100% free to use without any hidden fees, subscriptions, or feature paywalls.

DeckTools is engineered purely as a static client-side web application. All calculations, parsing, and data transformations execute inside JavaScript running in your browser tab. We have no backend databases or tracking servers to store your data.

Simply click the theme toggle button located at the top right of the navigation header on any page. Your theme preference will automatically be saved for future visits.

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General Website Disclaimer

DeckTools provides web utilities, calculators, and converters for educational, technical, and informational purposes. While we strive for maximum accuracy, tool outputs should be independently verified for official financial, tax, legal, or medical decisions.