# Lean Entrepreneur

> Free, no-signup, client-side browser tools and calculators for founders, freelancers, marketers, creators and developers. Every tool runs entirely in the browser: no logins, no uploads, no tracking. Built by Manuel Koelman.

## Tool categories
- [Home](https://leanentrepreneur.com/): All tools.
- [Creator](https://leanentrepreneur.com/creator/)
- [Developer](https://leanentrepreneur.com/developer/)
- [Events](https://leanentrepreneur.com/events/)
- [Finance](https://leanentrepreneur.com/finance/)
- [Marketing](https://leanentrepreneur.com/marketing/)
- [Productivity](https://leanentrepreneur.com/productivity/)
- [Recruiting](https://leanentrepreneur.com/recruiting/)

## Tools

### Creator
- [Aspect Ratio Calculator](https://leanentrepreneur.com/tools/aspect-ratio-calculator/): Solve for a width or height that keeps your aspect ratio, or simplify any resolution to its ratio like 16:9.
- [Color Palette from Image](https://leanentrepreneur.com/tools/color-palette-from-image/): Extract a color palette from any image. Pull the dominant colors as hex codes in your browser, nothing uploaded.
- [DPI Calculator & Print Quality Visualizer](https://leanentrepreneur.com/tools/print-quality/): Check if your image is high enough resolution to print. Visualizes pixelation based on print size and viewing distance. No upload required.
- [EXIF Remover](https://leanentrepreneur.com/tools/exif-remover/): Remove EXIF metadata (GPS location, camera, and timestamp) from a JPEG in your browser. Lossless, so the image quality is untouched. Nothing is uploaded.
- [EXIF Viewer](https://leanentrepreneur.com/tools/exif-viewer/): See the EXIF metadata inside a photo: camera, lens, exposure, GPS location, and timestamp. Read in your browser, nothing uploaded.
- [Image Color Picker](https://leanentrepreneur.com/tools/image-color-picker/): Pick any color from an image and get its hex and RGB value. Click a pixel in your browser, nothing uploaded.
- [Image Compressor](https://leanentrepreneur.com/tools/image-compressor/): Compress JPG, PNG, and WebP images to a target file size, right in your browser. Nothing is uploaded.
- [Image Converter](https://leanentrepreneur.com/tools/image-converter/): Convert images between PNG, JPG and WebP in your browser. Nothing is uploaded. Drop a file, pick a format, download.
- [Image Cropper](https://leanentrepreneur.com/tools/image-cropper/): Crop an image to any aspect ratio in your browser. Drag the crop box, lock a ratio, and download. Nothing is uploaded.
- [Image to PDF](https://leanentrepreneur.com/tools/image-to-pdf/): Combine JPG or PNG images into a single PDF in your browser, one image per page. Nothing is uploaded.
- [Instagram Line Break Generator](https://leanentrepreneur.com/tools/instagram-line-break-generator/): Add real line breaks and blank lines to Instagram captions, bios, and comments that survive the post. Works for TikTok and other apps too.
- [Invisible Character](https://leanentrepreneur.com/tools/invisible-character/): Copy an invisible character, a blank that is not empty, for usernames, captions, and messages that require text. Click to copy, no signup.
- [LinkedIn Text Formatter](https://leanentrepreneur.com/tools/linkedin-text-formatter/): Create bold, italic, and strikethrough text for LinkedIn, Twitter, and Instagram. Copy and paste formatted Unicode text.
- [Readability Score](https://leanentrepreneur.com/tools/readability-score/): Check how hard your writing is to read with Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog and more. Paste text, get scores.
- [Rotate & Flip Image](https://leanentrepreneur.com/tools/rotate-image/): Rotate, flip, or mirror an image and download it, all in your browser. Nothing is uploaded.
- [Signature Generator](https://leanentrepreneur.com/tools/signature-generator/): Draw or type your signature and download it as a transparent PNG, all in your browser. Nothing is uploaded and nothing is stored.
- [Social Media Image Resizer](https://leanentrepreneur.com/tools/image-resizer/): Resize and crop one image to the exact size every social platform wants. Runs in your browser, nothing uploaded.
- [Video Bitrate Calculator](https://leanentrepreneur.com/tools/bitrate-calculator/): Calculate video file sizes based on bitrate, duration, and codec. Estimate how many clips fit on your SD card. Supports all major camera formats.
- [Word & Character Counter](https://leanentrepreneur.com/tools/word-counter/): Count words, characters, sentences, and reading time live as you type. Checks against real platform limits.
- [YouTube Thumbnail Downloader](https://leanentrepreneur.com/tools/youtube-thumbnail-downloader/): Download the thumbnail of any YouTube video in every resolution, or preview your own at real feed sizes.

### Developer
- [Case Converter](https://leanentrepreneur.com/tools/case-converter/): Convert text to UPPERCASE, lowercase, Title Case, or Sentence case, and strip extra spaces and line breaks.
- [JSON <-> CSV Converter](https://leanentrepreneur.com/tools/json-csv/): Convert JSON to CSV and vice versa instantly. Client-side processing ensures your data never leaves your browser.
- [Slug Generator](https://leanentrepreneur.com/tools/slug-generator/): Turn any title or text into a clean, URL-safe slug. Strips accents and symbols, lowercases, and hyphenates. Runs in your browser.
- [Vector Scrubber](https://leanentrepreneur.com/tools/vector-scrubber/): Clean and minify bloated SVG code from Figma or Illustrator. Export to Clean SVG, React/JSX, or CSS Data URI instantly.

### Events
- [Event Matchmaking](https://leanentrepreneur.com/tools/event-matchmaking/): A free event matchmaking tool. Set roles and rounds, put it on the big screen, and everyone meets the right people. No app for guests.
- [Event Ticket Pricing Calculator](https://leanentrepreneur.com/tools/ticket-breakeven/): Calculate the exact ticket price needed to break even on your event. Factor in fixed costs, variable costs per head, and expected attendance.
- [Networking Bingo Generator](https://leanentrepreneur.com/tools/networking-bingo/): Generate randomized 5x5 Bingo cards for events. Print-perfect CSS. Includes Startup, Corporate, and Conference presets.
- [Room Capacity Calculator](https://leanentrepreneur.com/tools/seat-filler/): Calculate the maximum number of people your room can hold. Supports Theater, Banquet, and Cocktail layouts. Metric and Imperial units.
- [The Perfect Rotation](https://leanentrepreneur.com/tools/perfect-rotation/): Generate collision-free seating charts for speed networking events. Round-robin logic ensures everyone meets exactly once.
- [The Raffle Picker](https://leanentrepreneur.com/tools/randomizer/): Pick raffle winners, draw seat numbers, or select contest participants. Paste attendee names or set a number range, adjust spin speed for drama, then draw live on the big screen with fullscreen mode.
- [The Stage Timer](https://leanentrepreneur.com/tools/stage-timer/): Keep presentations on time with a massive fullscreen timer. Preset durations (1, 3, 5, 10 min), visual warnings (yellow at 1 min, red at overtime), and hover controls. Perfect for pitch decks and conference talks.

### Finance
- [Cost of Turnover Calculator](https://leanentrepreneur.com/tools/cost-of-turnover/): Calculate the true cost of an employee leaving. Quantify productivity loss, recruitment fees, and onboarding drag in a real-time invoice.
- [Discount Profit Calculator](https://leanentrepreneur.com/tools/discount-erosion/): Calculate the impact of discounts on your profit margin. See exactly how much sales volume you need to offset a price reduction.
- [Employee Cost Calculator](https://leanentrepreneur.com/tools/employee-cost/): Calculate the fully loaded cost of an employee including taxes, benefits, and equipment. Supports US and EU tax burden estimates.
- [Estimate Generator](https://leanentrepreneur.com/tools/estimate-generator/): Create and download a clean PDF estimate or quote in your browser. Add line items, a valid-until date, and terms. No account, no watermark.
- [Etsy Fee Calculator](https://leanentrepreneur.com/tools/etsy-fee-calculator/): Calculate the total Etsy fees on a sale (transaction, payment processing, and listing) and what you actually keep. Rates as of 2025.
- [Freelance Hourly Rate Calculator](https://leanentrepreneur.com/tools/freelance-hourly-rate-calculator/): Stop undercharging. Calculate your true hourly rate based on billable hours, taxes, and lifestyle goals.
- [Invoice Generator](https://leanentrepreneur.com/tools/invoice-generator/): Create and download a clean PDF invoice in your browser. No account, no watermark, no data sent anywhere.
- [Margin vs Markup Calculator](https://leanentrepreneur.com/tools/margin-vs-markup-calculator/): Calculate profit margin and markup from cost and price, and convert between the two. They are not the same number.
- [PayPal Fee Calculator](https://leanentrepreneur.com/tools/paypal-fee-calculator/): Calculate PayPal fees and what you keep, or work out what to charge so the money you receive hits your target. Rates as of 2025.
- [Receipt Generator](https://leanentrepreneur.com/tools/receipt-generator/): Create and download a simple PDF receipt for a payment, rent, or cash sale in your browser. No account, no watermark, no data sent anywhere.
- [Salary to Hourly Calculator](https://leanentrepreneur.com/tools/salary-to-hourly-calculator/): Convert an annual salary into hourly, daily, and monthly pay, plus the freelance rate needed to match it.
- [Startup Dilution Calculator](https://leanentrepreneur.com/tools/startup-dilution-calculator/): See who owns what after a funding round. Visualize equity dilution across founders, employees, and investors instantly.
- [Startup Runway Calculator](https://leanentrepreneur.com/tools/startup-runway-calculator/): Model your startup runway with revenue growth and expense trends. Find out if you are Default Alive or Default Dead, and how many months of savings you have before you must act.
- [Stripe Fee Calculator](https://leanentrepreneur.com/tools/stripe-fee-calculator/): Calculate exactly how much to charge a client to cover Stripe or PayPal fees. Invert the fee formula to hit your target net deposit.
- [TAM SAM SOM Calculator](https://leanentrepreneur.com/tools/tam-sam-som-calculator/): Validate your startup idea size. Calculate the exact market share required to hit your revenue goals.
- [Time Card Calculator](https://leanentrepreneur.com/tools/time-card-calculator/): Total a week of work hours from clock-in and clock-out times, with breaks and overtime. No signup, nothing stored.
- [VAT Calculator](https://leanentrepreneur.com/tools/vat-calculator/): Add or remove VAT from any price. Enter net, VAT, or gross and the other two update instantly. Supports the 20% UK standard rate, 5% reduced, or a custom rate.
- [Vesting Cliff Calculator](https://leanentrepreneur.com/tools/vesting-cliff/): Visualize the golden handcuffs. See your vesting cliff and calculate exactly how many shares you own by specific dates.

### Marketing
- [A/B Test Significance Calculator](https://leanentrepreneur.com/tools/ab-test-calculator/): Check whether your A/B test result is statistically significant. Enter visitors and conversions for each variant.
- [Ad Budget Pacer](https://leanentrepreneur.com/tools/budget-pacer/): Calculate your ad spend velocity. Find the exact daily budget required to hit your monthly cap without going over.
- [Barcode Generator](https://leanentrepreneur.com/tools/barcode-generator/): Generate a barcode (Code 128, EAN-13, UPC-A, Code 39, ISBN) and download it as PNG or SVG. Nothing is uploaded.
- [Conversion Rate Calculator](https://leanentrepreneur.com/tools/conversion-rate-calculator/): Calculate conversion rate from visitors and conversions, and project revenue across each stage of your funnel from click to sale.
- [Corporate Email Permutator](https://leanentrepreneur.com/tools/email-permutator/): Generate the 34 most common corporate email patterns for any prospect. Includes Gmail-ready clipboard export for visual verification.
- [CPM Calculator](https://leanentrepreneur.com/tools/cpm-calculator/): Calculate CPM, impressions, or ad spend from any two values. Also does CPC and CPA.
- [Engagement Rate Calculator](https://leanentrepreneur.com/tools/engagement-rate-calculator/): Calculate your social media engagement rate from likes, comments and followers, and see how it compares to platform benchmarks.
- [Google Review Link Generator](https://leanentrepreneur.com/tools/review-link/): Create a direct link to your Google Business 'Write a Review' popup. Increase customer reviews by removing the search step.
- [Influencer Rate Calculator](https://leanentrepreneur.com/tools/influencer-rate/): Calculate fair market rates for influencer partnerships based on follower count and engagement metrics.
- [Max CPL Calculator](https://leanentrepreneur.com/tools/max-cpl/): Calculate the maximum Cost Per Lead (CPL) you can afford based on your product margin and sales close rate.
- [QR Code Generator](https://leanentrepreneur.com/tools/qr-code-generator/): Generate a permanent QR code for any link or text. No signup, no expiry, no tracking redirect. Download as PNG or SVG.
- [ROAS Breakeven Calculator](https://leanentrepreneur.com/tools/roas-breakeven/): Stop guessing your ad budget. Calculate the exact Minimum ROAS and Max CPA required to be profitable after COGS and merchant fees.
- [ROAS Calculator](https://leanentrepreneur.com/tools/roas-calculator/): Calculate return on ad spend from revenue and ad spend, or solve for the revenue or spend you need to hit a target ROAS.
- [The UTM Architect](https://leanentrepreneur.com/tools/utm-architect/): Generate perfectly formatted UTM tracking links. Automatically forces lowercase and removes spaces for pristine analytics data.
- [The UTM Bulk Builder](https://leanentrepreneur.com/tools/utm-bulk/): Generate dozens of UTM links instantly with a cartesian grid. Perfect for large campaigns.

### Productivity
- [Delete Pages from PDF](https://leanentrepreneur.com/tools/delete-pages-from-pdf/): Remove pages from a PDF and download the smaller file. Lossless and in your browser, nothing uploaded.
- [Meeting Cost Calculator](https://leanentrepreneur.com/tools/meeting-cost-calculator/): Visualize the cost of your meeting in real-time based on attendee count and salary. Watch the money burn as it runs.
- [Merge PDF](https://leanentrepreneur.com/tools/merge-pdf/): Combine several PDF files into one, in the order you choose. Lossless and in your browser, nothing uploaded.
- [Rotate PDF](https://leanentrepreneur.com/tools/rotate-pdf/): Rotate the pages of a PDF and download the corrected file. Lossless and in your browser, nothing uploaded.
- [Timezone Overlap Grid](https://leanentrepreneur.com/tools/timezone-grid/): Find the perfect meeting time between two cities instantly. Visualizes business hours vs. awake hours.
- [Words to Minutes Calculator](https://leanentrepreneur.com/tools/words-to-minutes/): Convert word count to speaking time. Includes buffers for breathing and pacing. Perfect for podcasts, speeches, and YouTube scripts.

### Recruiting
- [LinkedIn Boolean Search Generator](https://leanentrepreneur.com/tools/linkedin-boolean/): Generate error-free Boolean search strings for LinkedIn and Google X-Ray. Include titles, exclude keywords, and bypass search limits.
- [The Lead Excavator](https://leanentrepreneur.com/tools/lead-dork/): Generate advanced Google Search Operator queries (Dorks) to find public spreadsheets, Trello boards, and attendee lists containing sales leads.