Free Web Tools
A growing set of fast, private utilities that run entirely in your browser — what you enter never leaves your device. Built by Patrick Bushe.
Hydration During Run Calculator
Calculate fluid needed from hours running and an hourly fluid rate. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolIdeal Weight Range Calculator
Free ideal weight range calculator comparing Devine and Robinson formula estimates from height and sex, with pounds and kilograms shown locally.
Open ToolImage Chroma Key Tool
Use this free image chroma key tool in your browser to make pixels near a chosen key color transparent using tolerance distance. Output stays private and local.
Open ToolImage Collage Maker
Free image collage maker that arranges multiple uploaded images into a square grid canvas and exports the combined collage as a PNG locally.
Open ToolImage Color Extractor
Free image color extractor that samples an uploaded image in your browser and returns a simple dominant-color palette.
Open ToolImage Dimensions Viewer
Free image dimensions viewer: see an image’s width, height, aspect ratio, and file size, all in your browser.
Open ToolImage Floyd-Steinberg Dither
Use this free image floyd-steinberg dither in your browser to apply Floyd-Steinberg error diffusion to local raster luminance. Output stays private and local.
Open ToolImage Resizer
Free image resizer for changing uploaded image dimensions in your browser, with canvas preview, download output, and no file upload required.
Open ToolImage Rounded Corner Tool
Use this free image rounded corner tool in your browser to mask local raster corners to an adjustable radius with transparency. Output stays private and local.
Open ToolImage to Base64 Converter
Free image to Base64 converter: turn an image into a Base64 data URI you can embed in code or CSS, in your browser.
Open ToolImpermanent Loss Calculator
Calculate constant-product AMM impermanent loss from a price change ratio with local DeFi math. It runs entirely in your browser, with no uploads or accounts.
Open ToolInductive and Capacitive Reactance
Free inductive and capacitive reactance with labeled inputs and an immediate result. It calculates AC reactance at a chosen frequency privately in your browser.
Open ToolINI To JSON
Free INI to JSON converter for sectioned config files. Parse common key value files locally in your browser.
Open ToolInstagram Caption Counter
Free instagram caption counter. It counts Unicode characters against a 2,200-character caption limit and keeps entered data private in your browser.
Open ToolInternal Link Opportunity Finder
Paste page snippets and target keywords to find internal link opportunities with suggested source pages and anchor text. Browser-only.
Open ToolInterval Timer
Free interval timer that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.
Open ToolInventory Carrying Cost Calculator
Calculate annual and monthly inventory carrying cost from value and a carrying rate. It runs entirely in your browser — no uploads or accounts.
Open ToolInvert Image Colors
Free image colour inverter: create a photographic negative of any image and download it, in your browser.
Open ToolIP Range to CIDR
Free IP range to CIDR converter that covers an inclusive IPv4 start and end with the smallest aligned exact block list using exact math in your browser.
Open ToolIP to Integer Converter
Free IPv4 to integer converter: turn a dotted IP into its 32-bit number and back, computed locally in your browser.
Open ToolIPv6 Subnet Calculator
Free IPv6 subnet calculator that applies a prefix with 128-bit arithmetic and reports the compressed network, host bits, and capacity in your browser.
Open ToolIV Drip Rate Calculator
Free iv drip rate calculator with labeled inputs and an immediate result. It calculates a theoretical gravity drip rate privately in your browser.
Open ToolJS Beautifier Lite
Free lightweight JavaScript beautifier that adds basic line breaks and indentation to simple snippets locally.
Open ToolJSON Flattener
Free JSON flattener that converts nested objects and arrays into dot-notation keys. Inspect API data or prepare flat exports locally and privately.
Open ToolJSON Schema Generator
Free JSON schema generator that infers a practical schema from sample JSON. Detect types, arrays, required keys, and nested objects locally.
Open ToolJSON Schema Sample
Build JSON schema sample in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolJSON To Go Struct
Free JSON to Go struct generator that infers basic field types and JSON tags from sample objects locally.
Open ToolJSON to GraphQL Type
Free JSON to GraphQL type generator that safely infers nested object types, scalar fields, lists, and nullability hints from data in your browser.
Open ToolJSON To Query String
Free JSON to query string converter that flattens simple objects into URL parameters. Build params locally in your browser.
Open ToolJSON to YAML Converter
Free json to yaml converter that runs locally in your browser.
Open ToolKeyword Cannibalization Mapper
Paste keyword, URL, position, and click rows to find queries where multiple pages may be competing. Local SEO analysis tool.
Open ToolKeyword Cluster Cleaner
Clean and deduplicate pasted keyword lists before grouping them into topic clusters.
Open ToolKilocalories to Kilojoules
Convert kilocalories to kilojoules and kilojoules to kilocalories using the exact 4.184 factor, with precise energy results in your browser.
Open ToolKilowatt-Hours to Joules
Convert kilowatt-hours to joules and joules to kilowatt-hours using the exact energy relationship, with precise results calculated in your browser.
Open ToolKinetic Energy Calculator
Free kinetic energy calculator: find the energy of a moving object from mass and speed with KE = ½mv², in your browser.
Open ToolLanding Page Section Planner
Free landing page section planner that runs locally in your browser.
Open ToolLandscape Fabric Roll Calculator
Calculate landscape fabric rolls from bed area, roll coverage, and overlap. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolLC Resonant Frequency Calculator
Free lc resonant frequency calculator with labeled inputs and an immediate result. It finds ideal inductor-capacitor resonance privately in your browser.
Open ToolLead Qualification Scorecard
Score a lead by budget, urgency, fit, authority, and problem clarity. Free private browser tool.
Open ToolLeap Year Checker
Free leap year checker that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.
Open ToolLED Resistor Calculator
Free LED series resistor calculator: enter supply voltage, LED forward voltage, and current to get the resistor value and power, in your browser.
Open ToolLicense Picker
Free software license picker comparing MIT, Apache 2.0, GPL 3.0, and BSD 3-Clause basics with copyable summaries.
Open ToolLicensing Fee Calculator
Calculate a licensing fee and the licensee share from net receipts and a rate. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolLine Break Converter
Free line break converter for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolLinkedIn Headline Generator
Create LinkedIn headline options from current role, professional specialty, and value keywords with character counts and local output in your browser.
Open ToolList Randomizer
Free list randomizer: shuffle any list of lines into a fair random order, computed locally in your browser.
Open ToolList Union Dedupe
Free list union and dedupe tool that combines multiple pasted lists into one unique set. Normalize case, trim values, and copy results locally.
Open ToolLoan Payment Calculator
Free loan payment calculator for monthly payment, total paid, and total interest from amount, APR, and term. Runs locally in your browser for private planning.
Open ToolLocal Competitor Comparison Worksheet
Create a worksheet for comparing local competitors from manually gathered notes.
Open ToolLong-Tail Question Generator
Free long-tail question generator that turns a seed topic into who, what, why, how, comparison, and cost question ideas. Runs locally in browser.
Open ToolMAC Address Formatter
Free MAC address formatter: paste a MAC in any style and get colon, hyphen, and Cisco dot forms plus the OUI vendor prefix, in your browser.
Open ToolMach to kilometer/hour Converter
Free mach to kilometer/hour converter with exact speed math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolManual Currency Rate Calculator
Convert an amount using a manually entered exchange rate with no live lookup or external request. It runs entirely in your browser, with no uploads or accounts.
Open ToolMarkdown to Table Data
Free Markdown table to CSV converter that parses pipe tables back into rows. Clean docs tables into reusable data locally with copy output now.
Open ToolMarkup vs Margin Calculator
Free markup and margin converter: convert between markup percentage and profit margin, computed in your browser.
Open Toolmegabit/second to kilobit/second Converter
Free megabit/second to kilobit/second converter with exact data math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open Toolmegabyte to gigabyte Converter
Free megabyte to gigabyte converter with exact data math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolMerge PDF
Combine several PDF files into one document entirely in your browser and download the merged result. Your files are never uploaded to any server.
Open ToolMeta Tag Preview Tool
Preview Google-style search snippets and copy title, description, and canonical tags.
Open Toolmicron to inch Converter
Free micron to inch converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open ToolMicrons to Millimeters Converter
Convert microns to millimeters and millimeters to microns with exact metric scaling, six-significant-figure results, and a table in your browser.
Open Toolmil to millimeter Converter
Free mil to millimeter converter with exact length math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open Toolmillibar to pound/sq inch Converter
Free millibar to pound/sq inch converter with exact pressure math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolModular Scale Calculator
Free modular scale calculator: build a harmonious type scale from a base size and ratio, in your browser.
Open ToolMorse Code Audio Player
Free Morse code audio player converts text to timed dots and dashes and plays local tones. Runs in your browser; no uploads or accounts are used.
Open ToolMorse Code Translator
Free morse code translator for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolMortgage Payment Calculator
Free mortgage payment calculator with principal and interest plus monthly tax and insurance estimates. Runs locally in your browser for private planning.
Open ToolNamed Color Explorer
Free CSS named color explorer with searchable swatches, hex values, and quick copy text for common web colors.
Open ToolNano ID Generator
Free Nano ID generator for short URL-safe identifiers. Pick length and quantity, then generate random IDs locally in your browser.
Open ToolNearest Web-Safe Color
Free web-safe color tool: find the closest color from the classic 216-color web-safe palette to any hex, computed locally in your browser.
Open ToolNote Frequency Calculator
Calculate a note frequency from a base pitch and a semitone offset. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolNumber Base Converter
Free number base converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolNumber List Stats
Free number list stats calculator for sum, average, median, mode, range, variance, and standard deviation from pasted values in your browser.
Open ToolOdds & Probability Converter
Free odds to probability converter: switch between odds, probability, and percentage, computed in your browser.
Open ToolOne-Time Pad Cipher
Free one-time pad XOR cipher: encrypt text against a key to hex, and decrypt it back, computed locally in your browser.
Open ToolOne-Way ANOVA Calculator
Free one-way ANOVA calculator comparing three or more numeric groups with between, within, degrees of freedom, and F output in your browser.
Open ToolOpenapi Path Stub
Work with openapi path stub in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.
Open ToolPace to Speed Calculator
Free pace to speed calculator: convert running pace into speed in km/h and mph, computed in your browser.
Open ToolPangram Checker
Free pangram checker: test whether text uses every letter of the alphabet and see which letters are missing, computed locally in your browser.
Open ToolPantone-style Name Guesser
Free color name guesser that creates a descriptive, Pantone-style name from hue, saturation, and lightness clues.
Open ToolParallelogram Area Calculator
Free parallelogram area calculator: find the area from base and perpendicular height, in your browser.
Open ToolPAS Copy Framework Builder
Free PAS copy framework builder that turns a problem, pain, and solution into structured copy for emails and landing pages. Runs locally in your browser for...
Open ToolPascal’s Triangle Generator
Free Pascal triangle generator that builds every row from zero through your selected index and shows binomial coefficients privately in your browser.
Open ToolPayment Plan Splitter
Free payment plan splitter that divides a total into installments with optional deposit, fees, and payment schedule notes. Runs locally in your browser for...
Open ToolPercent Yield Calculator
Free percent yield calculator: find reaction yield from actual and theoretical amounts, in your browser.
Open ToolPercentage Calculator
Free percentage calculator for percent of a number, increase, decrease, and reverse percentage calculations. Runs locally in your browser for private planning.
Open ToolPerformance Review Phrase Helper
Generate balanced performance review phrase prompts for strengths, growth areas, and next steps.
Open ToolPig Latin Translator
Free pig latin translator for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolPower Calculator
Free power calculator: find power from work done and time taken, computed locally in your browser.
Open ToolPress Release Boilerplate Generator
Free press release boilerplate generator that runs locally in your browser.
Open ToolPricing Tier Copy Generator
Generate draft pricing tier names, descriptions, feature bullets, and CTA copy for SaaS or service offers.
Open ToolPrivacy Policy Generator
Create a plain-language privacy policy from site details, data practices, third parties, cookies, regional rights, and local output controls.
Open ToolProposal Scope Builder
Generate a clear proposal scope section with deliverables, assumptions, exclusions, timeline, and acceptance criteria.
Open ToolProposal Section Builder
Generate proposal sections for objectives, deliverables, assumptions, exclusions, and next steps.
Open ToolPSI to Bar Converter
Convert PSI to bar and bar to PSI using the standard pressure relationship, with six-significant-figure results and a quick table in your browser.
Open ToolQR Code Generator
Generate downloadable QR codes for URLs and short text locally in your browser.
Open ToolQuadratic Equation Solver
Free quadratic equation solver: enter a, b, and c to get the real or complex roots, the discriminant, and the vertex, right in your browser.
Open ToolRagbaby Cipher
Free Ragbaby cipher shifts through a keyed alphabet by word number and letter position. Runs in your browser; no uploads or accounts are used.
Open ToolRandom Hex Color
Free random hex color generator with one-click reroll, copy-friendly output, and a running history of generated colors.
Open ToolReadability Scorer
Free readability scorer for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolRecipe Scaler
Free recipe scaler that multiplies each ingredient quantity for new serving counts, handling fractions and mixed numbers, entirely in your browser.
Open ToolRectangular Prism Calculator
Free rectangular prism calculator: find the volume, surface area, and diagonal from length, width, and height, in your browser.
Open ToolRegex Cheat Sheet Builder
Build a custom JavaScript regex cheat sheet by choosing anchors, groups, character classes, quantifiers, and flags.
Open ToolRegex Tester
Test JavaScript regular expressions against sample text and inspect matches locally.
Open ToolRemove Whitespace
Free whitespace remover: trim, collapse, or strip all spaces and blank lines from text, in your browser.
Open ToolRenewal Reminder Planner
Create renewal reminder tasks for subscriptions, contracts, domains, and software renewals.
Open ToolRetainer Capacity Calculator
Calculate included hours from a monthly retainer and an hourly rate. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolRetirement Savings Estimator
Free retirement savings estimator that projects balance growth from current savings, monthly contributions, years, and return. Runs locally in your browser...
Open ToolReturn Policy Draft Helper
Create a plain-language return policy draft checklist for ecommerce products.
Open ToolReview Response Generator
Create polite responses to positive, neutral, and negative customer reviews.
Open ToolRoman Numeral Converter
Free roman numeral converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolRoth vs Traditional Calculator
Free Roth vs Traditional calculator that compares after-tax retirement value from current tax and future tax assumptions. Runs locally in your browser for...
Open ToolRoyalty Payment Calculator
Calculate a royalty payment and the net to the seller from gross sales and a rate. It runs entirely in your browser — no uploads or accounts.
Open ToolRPG Gold Split Calculator
Calculate an even gold split and the leftover from a total and a player count. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolsameAs Schema Generator (JSON-LD)
Generate sameAs JSON-LD that links a person or organization to their social profiles, helping search engines connect your entity. Private, in your browser.
Open ToolSample Size Estimator
Free sample size estimator that approximates visitors needed per variant for conversion-rate experiments and surveys. Runs locally in your browser for...
Open ToolScrabble Word Finder
Find playable words from up to seven rack letters, optional blanks, and required letters, sorted by simple letter-score totals in your browser.
Open ToolScreen Resolution Info
Free screen resolution info that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolSEO Page Audit Checklist Generator
Generate a focused on-page SEO checklist for service pages, posts, product pages, local pages, and landing pages. Runs locally.
Open ToolShipping Margin Calculator
Estimate product margin after item cost, shipping cost, and packaging cost.
Open ToolShoe Size Converter
Free shoe size converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolSleep Cycle Bedtime Calculator
Free bedtime calculator that counts back 90-minute sleep cycles from your wake time so you wake between cycles feeling rested — runs in your browser.
Open ToolSoftware Overlap Finder
Compare software tools by feature overlap and decide what to keep, replace, or cancel.
Open ToolSpeed Converter
Free speed converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolSplit Complementary Calculator
Free split complementary calculator: find a base color with the two colors beside its complement, in your browser.
Open Toolsq foot to acre Converter
Free sq foot to acre converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open Toolsq meter to hectare Converter
Free sq meter to hectare converter with exact area math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolSteps to Distance Estimator
Free steps-to-distance estimator: convert a step count into kilometres and miles from your stride length or height, computed privately in your browser.
Open ToolStrikethrough Underline Text
Free strikethrough underline text for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolString Escaper
Free string escaper for JSON, JavaScript, HTML, CSV, and shell snippets. Escape pasted text locally for safer copying.
Open ToolSurvey Question Generator
Generate customer survey questions for feedback, product research, satisfaction, and discovery surveys.
Open ToolSVG Arc
Generate an SVG arc path from radius, start angle, and end angle. A 270-degree gauge arc can be copied as one path command for dashboards or icons.
Open ToolSVG Blob Generator — Random Organic Shapes
Generate smooth, random organic blob shapes as clean SVG — tune complexity, edge irregularity, and fill colour, then copy or download. Private in your browser.
Open ToolSVG Carbon Fiber Pattern Generator
Generate SVG carbon fiber pattern in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.
Open ToolSVG Cloud Shape
Generate simple SVG cloud silhouettes with adjustable lobes and fill color. A weather card can use a soft cloud icon behind a temperature label.
Open ToolSVG Device Frame
Create SVG phone and tablet frames with screen area, corner radius, and bezel width. Free and private in your browser, with nothing uploaded and no account.
Open ToolSVG Diagonal Lines Pattern Generator
Generate SVG diagonal lines pattern in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no.
Open ToolSVG Gauge
Create SVG gauge in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolSVG Progress Ring
Create SVG progress ring in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolSVG Rounded Rectangle
Generate an SVG rounded rectangle with adjustable radius, stroke, fill, and size. Free and private in your browser, with nothing uploaded and no account.
Open ToolSVG Ruler Icon
Generate SVG ruler icons with ticks, angle, stroke, and length controls. A design tool button can use a diagonal ruler glyph for measurement mode.
Open ToolSVG to PNG Converter
Free SVG to PNG converter: paste SVG code and download it as a raster PNG image, computed in your browser.
Open ToolSVG viewBox Helper
Use this free SVG viewBox helper in your browser to calculate and preview SVG viewBox coordinates with padding. Output stays private and local.
Open ToolSwatch to CSS Variables
Free swatch to CSS variables converter that turns a list of hex colors into named :root custom properties for design tokens.
Open ToolSwatch to Tailwind Config
Free swatch to Tailwind config converter that formats pasted hex colors into a theme.colors snippet for quick setup.
Open ToolTailwind Class Sorter
Free Tailwind class sorter that groups layout, spacing, typography, color, and state classes into a steadier order locally.
Open ToolTap Code Translator
Free tap code translator converts letters to five-by-five row-column pairs and back again. Runs in your browser; no uploads or accounts are used.
Open ToolTarget Weight Date Calculator
Free target weight date calculator: estimate when you will reach a goal weight at a steady rate, in your browser.
Open ToolTestimonial Request Email Generator
Generate polite testimonial request emails with customer-specific context and helpful prompt questions.
Open ToolText Repeater
Free text repeater for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
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