Free, Instant Online Tools with
Zero Cloud Uploads
Convert PDFs, compress images, calculate UK & US taxes, analyze code, and estimate e-commerce profits completely inside your browser memory.
Explore All 99 Multi-Tools
8 unique, dedicated color-coded suites for US, UK, developers, creators, and daily productivity.
Amazon FBA Fee & Net Profit Margin Calculator
Calculate Amazon FBA pick and pack fees, category referral fees (8%-15%), unit COGS, and net profit margins.
Browser Audio Speed & Pitch Changer
Speed up or slow down audio playback (0.25x to 3x) while preserving natural vocal pitch client-side.
Audio Waveform Image Generator (Canvas PNG Export)
Convert MP3 and WAV audio tracks into clean transparent PNG audio waveform graphics.
Auto Loan & Monthly Payment Calculator
Calculate monthly car financing payments, total interest costs, and trade-in deductions. 100% free client-side auto loan tool.
Blood Alcohol Content (BAC) & Sober Time Calculator
Estimate Blood Alcohol Content (BAC) and hours to sober (0.00%) using the Widmark formula.
Base64 Encoder & Decoder Online
Encode and decode text strings and UTF-8 characters to and from Base64 format. 100% free client-side developer utility.
Case Converter Online
Transform text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case. 100% free client-side tool.
CIDR & IPv4 Subnet Mask Calculator
Calculate CIDR subnet masks, wildcard masks, usable host IP ranges, and broadcast addresses client-side.
Clean Text & Whitespace Normalizer
Strip extra spaces, remove blank lines, trim tabs, and decode HTML entities from text. 100% free client-side text sanitization.
Color Blindness Accessibility Simulator
Simulate Protanopia, Deuteranopia, Tritanopia, and Achromatopsia on images to test visual UI accessibility.
Color Palette & Hex Extractor Online
Extract dominant color swatches, Hex codes, and RGB values from uploaded images. 100% client-side graphic analysis with zero server uploads.
Commute Gas & Fuel Cost Calculator
Calculate daily, monthly, and yearly gasoline commute budgets based on round-trip mileage and vehicle MPG.
Compound Interest & Investment ROI Calculator
Simulate investment growth with monthly contributions and interactive Chart.js growth curves. 100% free client-side wealth forecasting.
Cron Expression Schedule Builder & Explainer
Generate standard 5-part Linux cron schedule expressions with visual cadence selectors and plain-English explanations.
Multi-Layer CSS Box Shadow Stacker & Presets
Create smooth, multi-layered ambient box shadows and copy production-ready CSS box-shadow declarations.
CSS Flexbox Interactive Visual Layout Playground
Visually test and generate CSS flex-direction, justify-content, align-items, and flex-gap styling rules.
Credit Card Payoff & Debt Snowball Calculator
Calculate months to debt-free status and discover interest savings from accelerated payoff strategies. 100% free client-side debt calculator.
Stackable Discount & Reverse Markup Calculator
Calculate compounded multi-tier discounts (e.g. 30% off + 15% coupon), total dollars saved, and reverse markup prices.
eBay Final Value Fee & Profit Calculator
Calculate eBay 13.25% Final Value Fees, $0.30 per-order fee, promoted listings ad rates, and net seller profits.
Email Deliverability DNS Records Generator (SPF, DKIM, DMARC)
Generate SPF, DKIM, and DMARC TXT DNS records to meet Google and Yahoo email deliverability requirements.
Etsy Seller Fee & Net Profit Margin Calculator
Calculate Etsy $0.20 listing fees, 6.5% transaction fee, payment processing (3% + $0.25), and net take-home profit.
Electric Vehicle (EV) Home Charging Cost & Range Calculator
Calculate EV full-charge costs, electricity price per kWh, cost per mile, and annual savings compared to gas cars.
Privacy EXIF Metadata Stripper
Remove GPS coordinates, camera specs, timestamps, and hidden metadata from photos. 100% client-side privacy protection with zero server uploads.
Favicon & App Icon Generator Online
Generate complete favicon packages (16x16, 32x32, 180x180 Apple Touch, 512x512 PWA) in a single ZIP download. 100% client-side with zero server uploads.
Flooring & Tile Square Footage Calculator with 10% Wastage
Calculate total room square footage, 10%-15% cutting waste allowance, total material costs, and box counts.
Freelance Hourly Rate Calculator
Calculate your true billable hourly and daily freelance rate based on expenses, tax reserves, and non-billable administrative hours. 100% free.
CSS Glassmorphism & Backdrop Blur Generator
Design modern frosted-glass UI components with real-time backdrop-filter blur, RGBA background opacity, and border controls.
SHA-256, SHA-512 & SHA-1 Hash Generator
Generate cryptographic SHA-256, SHA-512, and SHA-1 checksums natively using the Web Crypto API. 100% private client-side hashing.
Apache .htaccess & Nginx 301 Redirect Rule Generator
Generate 301 redirect rules for HTTPS enforcement, www vs non-www, single pages, and domain migrations for Apache and Nginx.
HTML Table to Markdown & JSON Converter
Convert raw HTML table markup and copy-pasted spreadsheet rows into clean GitHub-flavored Markdown tables.
Lossless & Lossy Image Compressor
Reduce image file sizes (JPG, PNG, WebP) by up to 80% without losing quality. 100% client-side compression with instant live visual comparison.
Universal Image Converter Online
Convert images seamlessly across PNG, JPG, WebP, and BMP formats. 100% free, browser-based image converter with zero cloud uploads.
Image Cropper & Aspect Ratio Tool
Crop photos to exact ratios for Instagram, YouTube thumbnails, US/UK passport photos, and Twitter. 100% client-side with zero server uploads.
Image Resizer & Dimension Scaler Online
Resize images by exact pixels or percentage scaling with aspect-ratio lock. 100% client-side image scaling with zero server uploads.
Multiple Images to Animated GIF Maker
Combine multiple JPG and PNG photos into a looping animated GIF with custom frame delay controls.
Image to PDF Converter Online
Convert JPG, PNG, and WebP images to formatted PDF documents. Configure page size, orientation, and margins directly in your browser with zero server uploads.
JSON to CSV & CSV to JSON Converter
Convert tabular data bidirectionally between JSON and CSV with instant preview and file download. 100% free client-side tool.
JSON Formatter, Validator & Minifier
Beautify, validate, fix syntax errors, and minify JSON payloads directly in your browser. 100% free client-side developer utility.
JSON Web Token (JWT) Decoder & Payload Inspector
Decode JWT headers and payload claims client-side without sending authorization tokens to a third-party server.
Lorem Ipsum & Dummy Text Generator
Generate configurable placeholder paragraphs, sentences, and words for web mockups and typography layouts. 100% free client-side generator.
Markdown Live Editor & HTML Exporter
Split-screen real-time Markdown editor with instant live HTML preview and export. 100% free client-side Markdown tool.
Meme Generator & Watermark Overlay
Create viral memes with custom Impact typography and watermarks. 100% client-side graphic creation with zero server uploads.
Merge PDF Files Online
Combine multiple PDF files into one single document in seconds. 100% free, private client-side processing with zero server uploads.
Dual-Currency Mortgage & Amortization Calculator
Calculate monthly mortgage payments (PITI) with interactive Chart.js amortization schedules in USD ($) or GBP (£). 100% free and client-side.
OpenGraph & Social Meta Tag Generator
Generate complete HTML OpenGraph and Twitter card meta tags with live visual search engine and social media previews. 100% free.
Organize & Rotate PDF Pages Online
Rotate, delete, and rearrange PDF document pages visually. 100% free client-side PDF organizer with zero server uploads.
Password Entropy & NIST Strength Analyzer
Calculate password entropy in bits (E = L * log2(R)) and brute-force crack time estimates without sending passwords to a server.
Stripe vs PayPal vs Square Payment Fee Comparison Calculator
Compare credit card processing rates across Stripe (2.9% + 30¢), PayPal (2.99% + 49¢), and Square (2.6% + 10¢).
PDF Grayscale & Eco-Print Black and White Converter
Convert color document pages to high-contrast black-and-white grayscale to save printer ink and toner.
Client-Side Document & PDF Redactor
Black out sensitive numbers, names, and confidential text on documents with permanent pixel rasterization.
PDF Text Extractor Online
Extract raw selectable text directly from uploaded PDFs in your browser. Copy to clipboard or export to .txt with zero server uploads.
PDF to Image Converter Online
Convert PDF pages into high-resolution JPG or PNG images. 100% client-side rendering with canvas technology and zero cloud uploads.
Add Watermark & Page Numbers to PDF
Add custom text stamps (Confidential, Draft, Copy) and footer page numbers to PDF documents. 100% private browser processing with zero uploads.
Pet Medication Dosage & Liquid Volume Calculator (mg/kg to mL)
Calculate veterinary medication dosage in milligrams and liquid suspension volume in mL based on pet body weight.
Print-on-Demand (POD) Profit & Pricing Calculator
Calculate base garment costs, fulfillment shipping, marketplace fees, and net profit margins for Printify and Printful sellers.
Protect & Encrypt PDF Files Online
Secure sensitive PDF documents with strong password protection. 100% private, client-side encryption with zero server uploads.
Custom QR Code Generator Online
Create customized QR codes for website URLs, WiFi network logins, and text messages with custom color palettes. 100% free client-side tool.
Regular Expression (RegEx) Live Tester
Test regular expressions in real-time with instant match highlighting, flag toggles, and pattern validation. 100% free client-side tester.
Restaurant Recipe Food Cost & Menu Pricing Calculator
Calculate raw ingredient portion costs, target food cost percentage (28%-35%), and profitable menu retail pricing.
Robots.txt & XML Sitemap Directive Generator
Generate robots.txt crawler directives, disallow paths, user-agents, and XML sitemap references.
Sleep Cycle & 90-Minute REM Bedtime Calculator
Calculate optimal wake-up times and bedtimes based on natural 90-minute ultradian REM sleep cycles.
Speech-to-Text Voice Transcriber & Note Taker
Transcribe live voice dictation into editable text notes in real-time with zero API latency using the Web Speech API.
Split PDF Files Online
Extract custom page ranges or split all PDF pages into separate documents in one click. 100% client-side privacy with zero server uploads.
YouTube & TikTok Sponsorship Rate & CPM Estimator
Estimate fair brand sponsorship quotes and CPM valuations for YouTube videos, dedicated reviews, and TikTok shorts.
SQL Query Formatter & Syntax Beautifier
Beautify and format complex SQL queries with uppercase keyword highlighting and clean indentation client-side.
SVG to PNG/JPEG High-Res Rasterizer
Convert SVG vector files into high-DPI raster PNG or JPEG images with 1x, 2x, 4x, and 8x scaling. 100% client-side browser rasterization.
TDEE & Macro Nutrient Split Calculator (US lbs & UK stone)
Calculate maintenance calories (TDEE), cutting deficits, bulking calories, and protein/fat/carb macro splits with the Mifflin-St Jeor formula.
Text Diff & Comparison Checker Online
Compare text and code side-by-side with line-by-line visual difference highlighting for additions and deletions. 100% free client-side tool.
Text-to-Speech (TTS) Voice Previewer
Synthesize text into natural-sounding spoken audio using browser SpeechSynthesis with customizable pitch and speech rate.
Unix Epoch Timestamp & Timezone Converter
Convert Unix timestamps to UTC, ISO 8601, and local US/UK localized date-times instantly. 100% free client-side tool.
UK Capital Gains Tax (CGT) Calculator
Calculate UK Capital Gains Tax on buy-to-let property, second homes, crypto, and shares with the £3,000 exemption allowance.
UK Corporation Tax & Marginal Relief Calculator
Calculate UK Corporation Tax for limited companies with profits between £50,000 and £250,000 using official marginal relief fractions.
UK Council Tax Single Person Discount Calculator
Estimate your annual council tax savings with the 25% single person discount, student exemptions, and 10-month payment splits.
UK Dividend Tax Calculator for Company Directors
Calculate tax liability on dividends from limited companies and shares with the £500 allowance and 8.75% / 33.75% rates.
UK Inheritance Tax (IHT) & Nil-Rate Band Calculator
Calculate UK Inheritance Tax liability, £325,000 standard nil-rate band, and £175,000 residence nil-rate allowance.
UK Pension Tax Relief & Higher-Rate Reclaim Calculator
Calculate 20% automatic government top-ups and 20%-25% higher rate tax relief on personal SIPP and workplace pension contributions.
UK Take-Home Pay & Salary Calculator
Calculate UK take-home pay, PAYE Income Tax, Class 1 National Insurance, and pension deductions for the 2026/2027 tax year. 100% free and private.
UK Stamp Duty Land Tax (SDLT) Calculator
Calculate UK Stamp Duty (SDLT) for residential moves, first-time buyers, and additional buy-to-let properties for the 2026/2027 tax year. 100% free.
UK Statutory Maternity Pay (SMP) Calculator
Calculate your exact UK statutory maternity pay schedule, 90% earnings period, and weekly statutory rate under 2026 HMRC rules.
UK Statutory Redundancy Pay Calculator
Calculate your exact UK statutory redundancy entitlement, tax-free limits, and weekly pay multiplier under GOV.UK 2026/2027 rules.
UK Statutory Sick Pay (SSP) Calculator
Calculate UK Statutory Sick Pay (£116.75/wk) based on qualifying work days, 3 unpaid waiting days, and daily entitlement rates.
UK Student Loan Repayment Calculator
Calculate monthly student loan deductions and effective tax rates across Plan 1, Plan 2, Plan 4, Plan 5, and Postgraduate loans.
Unit & Metric Measurement Converter
Convert Length, Weight, Temperature, Area, and Volume between US Imperial and Metric systems. 100% free client-side converter.
URL & URI Component Encoder / Decoder
Encode and decode query strings and special characters using percent-encoding (%20). 100% free client-side web utility.
US 401(k) Employer Match & Compound Growth Calculator
Calculate your 401(k) employer match, annual contributions up to the $23,500 limit, and 30-year compound retirement wealth.
US Capital Gains Tax Calculator (Short-Term vs Long-Term)
Calculate federal capital gains taxes on stocks, crypto, and real estate with 0%, 15%, 20% brackets and 3.8% NIIT surtax.
US Car Lease vs Buy & Money Factor Calculator
Compare 36-month auto lease payments against 60-month purchase loans, residual values, and retained vehicle equity.
US Real Estate Closing Cost Estimator for Buyers & Sellers
Estimate homebuyer and seller closing costs including loan origination, title insurance, appraisal, escrow, and transfer taxes.
US Estate & Gift Tax Annual Exclusion Tracker
Track annual gift tax exclusions ($18,000 per recipient), married gift-splitting ($36,000), and Form 709 reporting thresholds.
US Home Affordability & 28/36 DTI Ratio Calculator
Calculate your maximum mortgage loan approval and home purchase budget based on standard 28% front-end and 36% back-end DTI limits.
US HSA Tax Savings & Triple-Tax Advantage Calculator
Calculate immediate income and FICA tax savings plus 30-year compound investment growth with Health Savings Accounts.
US Overtime Pay & FLSA Time-and-a-Half Calculator
Calculate weekly overtime earnings, time-and-a-half rates (1.5x), and blended average hourly pay under US FLSA regulations.
US Salary & Paycheck Net Pay Calculator
Calculate your net take-home paycheck across Federal tax brackets, FICA (Social Security & Medicare), State tax, and 401(k) deductions. 100% free.
US Self-Employment (SECA) Tax & Schedule SE Calculator
Calculate 15.3% FICA self-employment taxes, 92.35% statutory base, and 50% Form 1040 deductions for 1099 freelancers.
US Tip & Gratuity Bill Splitter with Custom Percentages
Calculate restaurant tips (15%, 18%, 20%, 25%), total bill with tax, and exact split-per-person amounts instantly.
UTM Campaign Link Builder (GA4)
Generate standardized tracking URLs for Google Analytics 4 (GA4) with source, medium, and campaign parameters. 100% free.
UUID / GUID (v4) Bulk Generator Online
Generate cryptographically random UUID v4 identifiers individually or in bulk. 100% free client-side crypto generator.
VAT & Sales Tax Calculator Online
Add or remove UK VAT (20%, 5%) and US State Sales Tax with instant Gross, Net, and Tax breakdowns. 100% free client-side tax tool.
Word, Character & Reading Time Counter
Live word count, character count, sentence count, reading time, speaking time, and keyword density checker. 100% free client-side tool.
Featured Privacy & Technical Guides
Navigating UK Statutory Redundancy in 2026
Understanding employee age multipliers, weekly pay caps, and the £30k tax exemption.
US RetirementThe Complete 401(k) Employer Match Guide
How to capture full company matching funds and build $250k+ in compound wealth.
E-Commerce EconomicsAmazon FBA vs Etsy Seller Fees in 2026
Real unit profit margin breakdowns, pick and pack rates, and platform commission analysis.