Active tools
263 activeNEOS TOOLS™
Every tool you need, right here.
Simple, fast, useful tools that work privately in your browser.
Suggested
Popular tools
Free to use
100% freeNo installation
use instantlyLanguage support
13 languagesFAVORITES
Favorites
♡ Save tools with the heart button.
TOOLS
All tools
Timer
A precise themed countdown timer that runs in your browser.
Calculator
A keyboard-ready calculator with private history.
Percentage Calculator
Calculate percentages, ratios, and percentage change.
Margin Calculator
Calculate profit, margin, markup, and target price.
Scientific Calculator
Trigonometry, logs, powers, constants, and DEG/RAD modes.
QR Generator
Create private QR codes locally and download them as PNG.
Word Counter
Count words, characters, sentences, and reading time locally.
VAT Calculator
Add or remove VAT and see net, tax, and gross amounts.
Discount Calculator
Calculate sale price, savings, and stacked discounts.
ROAS Calculator
Calculate return on ad spend, revenue per cost, and surplus.
ROI Calculator
Calculate return, profit, and annualized ROI.
Image Compressor
Compress JPG, PNG, or WebP images privately in your browser.
Merge PDF
Combine PDF files locally without uploading them.
JSON Formatter
Format, validate, and minify JSON locally.
Image Resizer
Resize images by width and height privately in your browser.
PDF Compressor
Optimize PDF structure locally and download the result.
Unit Converter
Convert 18 categories with SI and widely used standards.
Date Calculator
Find days between dates or add days to a date.
Password Generator
Generate strong passwords locally with secure browser randomness.
JPG to PNG
Convert JPG images to lossless PNG locally.
PNG to JPG
Convert PNG images to compact JPG locally.
PDF to JPG
Turn PDF pages into JPG images locally.
UUID Generator
Generate secure UUID v4 identifiers locally.
Base64 Encoder/Decoder
Encode and decode Unicode text as Base64.
WebP to JPG
Convert WebP images to JPG locally.
JPG to PDF
Combine JPG images into a PDF locally.
Split PDF
Extract selected PDF pages locally.
Image Cropper
Crop images to exact dimensions locally.
Case Converter
Switch text between common letter cases.
QR Scanner
Scan QR codes from images privately.
Image to WebP
Convert JPG or PNG images to WebP locally.
WebP to PNG
Convert WebP images to PNG locally.
Rotate PDF
Rotate all or selected PDF pages locally.
Remove PDF Pages
Remove selected pages from a PDF locally.
CSV to JSON
Convert CSV data to JSON locally.
JSON to CSV
Convert JSON arrays to CSV locally.
URL Encoder/Decoder
Encode and decode URL components locally.
Unix Timestamp Converter
Convert Unix timestamps and ISO dates locally.
Markdown Previewer
Write and safely preview Markdown locally.
Online Stopwatch
Precise stopwatch with pause and lap times.
Pomodoro Timer
Custom focus, short break, and long break cycles.
Loan Calculator
Monthly payment, total interest, extra payments, and schedule.
Compound Interest Calculator
Project growth with contributions and compounding frequency.
Age Calculator
Exact age, total days, and next birthday countdown.
PDF to PNG
Render every PDF page as a high-quality PNG locally.
PNG Compressor
Optimize PNG dimensions locally with honest size comparison.
Color Picker
Pick HEX, RGB, HSL and verify WCAG contrast.
Regex Tester
Test JavaScript regular expressions with live matches.
Hash Generator
Generate SHA-256, SHA-384, and SHA-512 for text or files.
Break-even Calculator
Calculate break-even units, revenue, margin, and target profit.
CAGR Calculator
Calculate compound annual growth rate from start and end values.
Tip Calculator
Split bills with tip, tax, totals, and per-person amounts.
Salary Calculator
Convert annual salary into monthly, biweekly, weekly, hourly, and estimated net pay.
BMI Calculator
Calculate adult BMI, category, and healthy-weight range.
Time Zone Converter
Compare a date and time across global IANA time zones.
Text Diff Checker
Compare two texts line by line with additions and removals.
HTML Formatter
Format or minify HTML locally in your browser.
CSS Formatter & Minifier
Format and minify CSS locally without uploads.
Cron Expression Parser
Validate five-field cron expressions and preview upcoming runs.
Value Proposition Builder
Build a testable customer profile, value map, and positioning statement.
Offer Builder
Build a clear offer with outcome, deliverables, transparent pricing, proof, and terms.
Customer Persona Builder
Build a behavior-first persona with goals, barriers, buying criteria, and evidence strength.
Pricing Scenario Calculator
Compare three price and demand scenarios by revenue, contribution margin, profit, and break-even volume.
Content Brief Builder
Create a people-first content brief with intent, audience, evidence, outline, metadata, and links.
SOP Builder
Build a controlled SOP with scope, owners, completion criteria, cautions, records, and a run checklist.
Mortgage Calculator
Estimate principal, interest, taxes, insurance, extra payments, payoff time, and amortization.
Calorie Calculator
Estimate adult resting energy, maintenance calories, and gentle goal ranges by activity level.
Image Metadata Viewer
Inspect image dimensions, file details and common JPEG EXIF fields locally, including GPS privacy signals.
Add Page Numbers to PDF
Add customizable page numbers to selected PDF pages locally with six positions, start number and styling.
PDF Watermark
Add a private, customizable text watermark to selected PDF pages with position, tiling, opacity and rotation controls.
Meta Tag Generator
Generate search, canonical, robots, Open Graph and X Card metadata with live previews.
Graphing Calculator
Plot and compare functions with pan, zoom, value tables, intercepts and PNG export.
Hook Maker
Create clear opening hooks for social posts, ads, and campaigns.
Headline Maker
Build concise campaign headlines from one clear promise.
CTA Maker
Generate direct calls to action without exaggerated claims.
Caption Maker
Turn a hook, promise, proof, and action into a social caption.
Hashtag Maker
Create a compact hashtag set from real campaign terms.
Bio Maker
Create a concise profile bio with value, proof, and action.
Coupon Maker
Prepare coupon copy with code, value, expiry, and terms.
UTM Maker
Build a correctly encoded campaign URL with UTM parameters.
QR Campaign Maker
Create a trackable campaign URL and downloadable QR code.
Lead Magnet Maker
Outline a useful downloadable resource for one audience and promise.
Email Signature Maker
Generate a clean professional email signature as reusable HTML.
Review QR Maker
Turn a verified review destination into a downloadable QR code.
Google Review Link Maker
Build the standard Google review URL from a verified Place ID.
SNS Link Maker
Organize website and social profile destinations into one clean list.
Content Calendar Maker
Create a practical seven-day campaign plan around one offer.
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions locally.
Matrix Calculator
Calculate determinants, inverses, and transposes locally.
Standard Deviation Calculator
Find mean, variance, and population or sample standard deviation.
Probability Calculator
Calculate event, complement, intersection, and union probabilities.
Random Number Generator
Generate secure random integers with range and uniqueness controls.
Savings Calculator
Calculate the monthly saving needed to reach a goal.
Retirement Calculator
Project retirement balance, contributions, and annual income.
APR Calculator
Estimate annual percentage rate including upfront loan fees.
Debt Payoff Calculator
Estimate payoff time, total interest, and total paid.
Sales Tax Calculator
Calculate subtotal, sales tax, and total for any entered rate.
Markup Calculator
Calculate selling price, profit, markup, and gross margin.
Profit Calculator
Calculate net profit, profit margin, and return on cost.
Commission Calculator
Calculate variable commission and total earnings from sales.
Hourly Rate Calculator
Find a sustainable hourly rate from income, expenses, tax reserve, and billable hours.
Conversion Rate Calculator
Calculate conversion rate, CPA, CPC, CPM, and CTR from one campaign.
CPM Calculator
Calculate cost per thousand impressions with related campaign metrics.
CPC Calculator
Calculate cost per click with CPM, CPA, CTR, and conversion rate.
CPA Calculator
Calculate acquisition cost with CPC, CPM, CTR, and conversion rate.
BMR Calculator
Estimate adult resting energy and maintenance calories by activity.
Pace Calculator
Calculate running pace, speed, and 5K or 10K finish estimates.
Business Days Calculator
Count inclusive weekdays between two dates without external services.
JWT Decoder
Decode JWT headers and payloads locally without claiming signature verification.
Slug Generator
Create clean lowercase URL slugs locally from text.
Permutation Calculator
Calculate ordered selections with transparent factorial math.
Combination Calculator
Calculate unordered selections from n items.
Prime Number Calculator
Check whether an integer is prime locally.
GCF Calculator
Find the greatest common factor of two integers.
LCM Calculator
Find the least common multiple of two integers.
Quadratic Formula Calculator
Solve real quadratic roots and show the discriminant.
Slope Calculator
Calculate line slope from two coordinate points.
Complex Number Calculator
Find magnitude, angle, and conjugate of a complex number.
Investment Return Calculator
Calculate gain and return after additional contributions.
Inflation Calculator
Estimate future cost and purchasing power under inflation.
Payroll Calculator
Estimate regular, overtime, and gross pay from hours.
Ecommerce Fee Calculator
Estimate fees, net profit, and margin with editable assumptions.
Customer Lifetime Value Calculator
Estimate customer lifetime value from spend, frequency, lifespan, and margin.
CAC Calculator
Calculate customer acquisition cost from marketing and sales spend.
Concrete Calculator
Estimate rectangular concrete volume with waste allowance.
Area Calculator
Calculate rectangle and triangle area from dimensions.
Volume Calculator
Calculate rectangular and cylindrical volume.
Ohm's Law Calculator
Calculate resistance and power from voltage and current.
Resistor Calculator
Combine two resistors in series or parallel.
Grade Calculator
Convert earned points into percentage and letter grade.
Character Counter
Count characters, non-space characters, and lines instantly.
Text Cleaner
Trim lines, collapse whitespace, and remove blank lines locally.
Duplicate Line Remover
Remove duplicate lines while preserving first-seen order.
Text Sorter
Sort lines naturally and alphabetically in the browser.
Lorem Ipsum Generator
Generate clean placeholder paragraphs without an API.
Readability Checker
Estimate English Flesch reading ease with transparent counts.
Reverse Text
Reverse Unicode text locally by code point.
Find and Replace
Replace exact text across a document locally.
Line Number Adder
Prefix every line with a sequential number.
Keyword Density Checker
Show frequent terms and percentages from local text.
Password Strength Checker
Check password length and character diversity locally.
File Hash Checker
Generate a local SHA-256 digest without uploading content.
HMAC Generator
Generate HMAC-SHA-256 locally with Web Crypto.
CSP Builder
Build a conservative Content Security Policy starting point.
Palette Generator
Build and copy a compact five-color palette locally.
Contrast Checker
Calculate WCAG contrast ratio and AA status.
Gradient Generator
Preview and copy a two-color CSS gradient.
Aspect Ratio Calculator
Reduce width and height to a clean aspect ratio.
Pixel REM Converter
Convert pixels and rem with an editable root font size.
CSS Clamp Generator
Generate a simple responsive CSS clamp expression.
Equation Solver
Solve a linear equation instantly.
Unit Circle Calculator
Fast browser-local unit circle calculator.
Percent Error Calculator
Fast browser-local percent error calculator.
Average Calculator
Fast browser-local average calculator.
Median Calculator
Fast browser-local median calculator.
Mode Calculator
Fast browser-local mode calculator.
Ratio Calculator
Fast browser-local ratio calculator.
Proportion Calculator
Fast browser-local proportion calculator.
Fraction Decimal Converter
Fast browser-local fraction decimal converter.
Number Base Converter
Fast browser-local number base converter.
Simple Interest Calculator
Fast browser-local simple interest calculator.
Loan Comparison Calculator
Fast browser-local loan comparison calculator.
Payback Period Calculator
Fast browser-local payback period calculator.
Gross Profit Calculator
Fast browser-local gross profit calculator.
Contribution Margin Calculator
Fast browser-local contribution margin calculator.
Inventory Turnover Calculator
Fast browser-local inventory turnover calculator.
Average Order Value Calculator
Fast browser-local average order value calculator.
CTR Calculator
Fast browser-local ctr calculator.
Email Open Rate Calculator
Fast browser-local email open rate calculator.
Engagement Rate Calculator
Fast browser-local engagement rate calculator.
Countdown Date
Fast browser-local countdown date.
Meeting Cost Calculator
Fast browser-local meeting cost calculator.
Work Hours Calculator
Fast browser-local work hours calculator.
Time Duration Calculator
Fast browser-local time duration calculator.
Week Number Calculator
Fast browser-local week number calculator.
Day of Year Calculator
Fast browser-local day of year calculator.
Random Picker
Fast browser-local random picker.
Decision Matrix
Fast browser-local decision matrix.
Checklist Maker
Fast browser-local checklist maker.
Habit Streak Calculator
Fast browser-local habit streak calculator.
YAML JSON Converter
Fast browser-local yaml json converter.
SQL Formatter
Fast browser-local sql formatter.
JavaScript Minifier
Fast browser-local javascript minifier.
HTML Entity Encoder
Fast browser-local html entity encoder.
Unicode Converter
Fast browser-local unicode converter.
MIME Type Lookup
Fast browser-local mime type lookup.
File Size Converter
Fast browser-local file size converter.
CSV Viewer
Fast browser-local csv viewer.
Filename Cleaner
Fast browser-local filename cleaner.
Query String Parser
Fast browser-local query string parser.
SERP Preview
Fast browser-local serp preview.
Robots.txt Generator
Fast browser-local robots.txt generator.
Hreflang Generator
Fast browser-local hreflang generator.
Canonical Checker
Fast browser-local canonical checker.
Open Graph Generator
Fast browser-local open graph generator.
FAQ Schema Generator
Fast browser-local faq schema generator.
Box Shadow Generator
Fast browser-local box shadow generator.
Border Radius Generator
Fast browser-local border radius generator.
Color Code Converter
Fast browser-local color code converter.
Favicon Generator
Fast browser-local favicon generator.
Flashcard Maker
Build and study private browser-local flashcards.
Citation Formatter
Format APA, MLA, and Chicago citation drafts locally.
GPA Calculator
Calculate a credit-weighted GPA locally.
Reading Time Calculator
Estimate reading time from word count.
Course Duration Calculator
Calculate total lesson and break duration.
Hashtag Counter
Count unique and duplicate hashtags locally.
Content Length Checker
Measure characters, words, and sentences instantly.
AI Answer Readiness Checker
Create, inspect, or transform ai answer readiness checker results privately in your browser.
Ad Copy Length Checker
Create, inspect, or transform ad copy length checker results privately in your browser.
Ad Creative Maker
Create, inspect, or transform ad creative maker results privately in your browser.
Banner Maker
Create, inspect, or transform banner maker results privately in your browser.
Barcode Generator
Create, inspect, or transform barcode generator results privately in your browser.
Barcode Reader
Create, inspect, or transform barcode reader results privately in your browser.
Book Cover Maker
Create, inspect, or transform book cover maker results privately in your browser.
Brand Maker
Create, inspect, or transform brand maker results privately in your browser.
Business Card Maker
Create, inspect, or transform business card maker results privately in your browser.
Card News Maker
Create, inspect, or transform card news maker results privately in your browser.
Carousel Maker
Create, inspect, or transform carousel maker results privately in your browser.
Cron Expression Builder
Create, inspect, or transform cron expression builder results privately in your browser.
EXIF Viewer
Create, inspect, or transform exif viewer results privately in your browser.
Emblem Maker
Create, inspect, or transform emblem maker results privately in your browser.
Heading Structure Checker
Create, inspect, or transform heading structure checker results privately in your browser.
Icon Maker
Create, inspect, or transform icon maker results privately in your browser.
Image Flipper
Create, inspect, or transform image flipper results privately in your browser.
Image Metadata Remover
Create, inspect, or transform image metadata remover results privately in your browser.
Image Rotator
Create, inspect, or transform image rotator results privately in your browser.
JSON Validator
Create, inspect, or transform json validator results privately in your browser.
Logo Maker
Create, inspect, or transform logo maker results privately in your browser.
Mockup Maker
Create, inspect, or transform mockup maker results privately in your browser.
JSON Schema Generator
Create, inspect, or transform json schema generator results privately in your browser.
PDF Form Filler
Create, inspect, or transform pdf form filler results privately in your browser.
PDF Metadata Viewer
Create, inspect, or transform pdf metadata viewer results privately in your browser.
Poster Maker
Create, inspect, or transform poster maker results privately in your browser.
Profile Maker
Create, inspect, or transform profile maker results privately in your browser.
Project Scope Builder
Create, inspect, or transform project scope builder results privately in your browser.
Proposal Outline Builder
Create, inspect, or transform proposal outline builder results privately in your browser.
QR Batch Generator
Create, inspect, or transform qr batch generator results privately in your browser.
Reorder PDF
Create, inspect, or transform reorder pdf results privately in your browser.
SNS Post Maker
Create, inspect, or transform sns post maker results privately in your browser.
SVG Optimizer
Create, inspect, or transform svg optimizer results privately in your browser.
Schema Markup Generator
Create, inspect, or transform schema markup generator results privately in your browser.
Sitemap Validator
Create, inspect, or transform sitemap validator results privately in your browser.
Social Image Resizer
Create, inspect, or transform social image resizer results privately in your browser.
Sticker Maker
Create, inspect, or transform sticker maker results privately in your browser.
Structured Data Validator
Create, inspect, or transform structured data validator results privately in your browser.
Thumbnail Maker
Create, inspect, or transform thumbnail maker results privately in your browser.
Twitter Card Generator
Create, inspect, or transform twitter card generator results privately in your browser.
URL QR Generator
Create, inspect, or transform url qr generator results privately in your browser.
WiFi QR Generator
Create, inspect, or transform wifi qr generator results privately in your browser.
YouTube Thumbnail Resizer
Create, inspect, or transform youtube thumbnail resizer results privately in your browser.
ZIP File Inspector
Create, inspect, or transform zip file inspector results privately in your browser.
eBook Cover Maker
Create, inspect, or transform ebook cover maker results privately in your browser.
vCard QR Generator
Create, inspect, or transform vcard qr generator results privately in your browser.
XML Formatter
Create, inspect, or transform xml formatter results privately in your browser.
TOML JSON Converter
Create, inspect, or transform toml json converter results privately in your browser.
IP Subnet Calculator
Create, inspect, or transform ip subnet calculator results privately in your browser.
User Agent Parser
Create, inspect, or transform user agent parser results privately in your browser.
HTTP Status Lookup
Create, inspect, or transform http status lookup results privately in your browser.
CSS Specificity Calculator
Create, inspect, or transform css specificity calculator results privately in your browser.
Markdown to HTML Converter
Create, inspect, or transform markdown to html converter results privately in your browser.
Text to Speech
Create, inspect, or transform text to speech results privately in your browser.
Markdown Table Generator
Create, inspect, or transform markdown table generator results privately in your browser.
JSON Path Tester
Create, inspect, or transform json path tester results privately in your browser.