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.
Frequency Table Builder
Free frequency table builder that counts repeated values and percentages from pasted rows. Sort results and copy a CSV summary locally fast.
Open ToolImage to Text (OCR)
Extract text from an image or screenshot in your browser with offline OCR, then copy or download it. Your image is never uploaded to any server.
Open ToolISBN Validator & Converter
Free ISBN tool: validate ISBN-10 and ISBN-13, and convert between them, with the check digit computed locally in your browser.
Open ToolISO 8601 Formatter
Free iso 8601 formatter that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.
Open ToolJSON Array Splitter
Free JSON array splitter that chunks a large JSON array into smaller arrays. Choose batch size and copy each chunk from your browser safely now.
Open ToolKeyword Density Checker
Paste text to see top repeated words, counts, and percentages locally.
Open ToolLeetspeak Converter
Free leetspeak converter: turn text into 1337 5p34k with numbers and symbols, or decode it back to plain text, in your browser.
Open ToolLetter Spacing Converter
Free letter-spacing converter: switch between pixels and em for a font size, computed locally in your browser.
Open Toolmetric tonne to kilogram Converter
Free metric tonne to kilogram converter with exact mass math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolPlaceholder Image URL Builder
Free placeholder image URL builder that creates SVG data URI placeholders with custom size, color, and label locally.
Open ToolPregnancy Due Date Estimator
Free due date estimator using Naegele’s rule (last period + 280 days), showing your estimated due date, gestational age, and trimester — in your browser.
Open ToolRegex Replace Playground
Free regex replace playground for testing replacements and capture groups. Preview transformed text locally in your browser.
Open ToolSchema Validator Lite
Free schema validator lite that runs locally in your browser.
Open ToolSitemap Change Detector
Compare old and new sitemap URL lists to find added, removed, and unchanged pages before a migration or launch. Runs locally.
Open ToolSudoku Solver
Solve a 9 by 9 Sudoku puzzle in your browser with editable givens, conflict checks, backtracking validation, highlighted solution cells, and reset.
Open ToolSVG Torn Paper Edge
Build an SVG torn-paper edge path with irregular points and fill color. A coupon block can use a rough lower edge to feel clipped from a sheet.
Open ToolTestimonial Formatter
Free testimonial formatter that runs locally in your browser.
Open ToolWatermark Adder
Free watermark adder that places custom text over an uploaded image with opacity and size controls, then exports a watermarked PNG locally online.
Open ToolAdler-32 Checksum Calculator
Calculate an eight-digit Adler-32 checksum from UTF-8 text with the standard prime modulus, plus a clear non-security warning in your browser.
Open ToolAge on Other Planets
Free planet age calculator: find how old you are in the years of other planets, computed locally in your browser.
Open ToolAlt Text Auditor
Free alt text auditor that scans pasted HTML for image tags with missing, empty, duplicated, or suspiciously long alt text. Runs locally in browser.
Open ToolAPI Key Generator
Free API key generator: create random keys and tokens in hex, alphanumeric, or URL-safe form using secure randomness, in your browser.
Open ToolAPI Response Mock Generator
Generate mock JSON API responses with fields, status, pagination, and error variants for prototyping and frontend testing.
Open ToolAudio Length from Size
Free audio length from size that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolBook Cipher
Free book cipher maps message words to first matching positions in a supplied reference passage. Runs in your browser; no uploads or accounts are used.
Open ToolBreadcrumbList Schema Builder
Free breadcrumb schema builder that converts label and URL rows into valid BreadcrumbList JSON-LD for page navigation and SEO. Runs locally in browser.
Open ToolBulk Title Meta Reviewer
Review title tags and meta descriptions in bulk with length and rewrite prompts.
Open ToolBullet List Maker
Free bullet list maker for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolChaocipher
Free Chaocipher encodes and decodes with two dynamically permuted twenty-six-letter alphabets. Runs in your browser; no uploads or accounts are used.
Open ToolColor to Grayscale
Free color to grayscale converter that compares average, luminosity, and lightness formulas for one selected color.
Open ToolComplementary Color Finder
Free complementary color finder that rotates a hex color around the color wheel and shows copy-ready pairing values.
Open ToolCron Next Run Preview
Free cron next run preview that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.
Open ToolCSS Animation Keyframes Builder
Free CSS keyframes builder for transform, opacity, and timing values. Generate animation CSS and preview it locally.
Open ToolCSS Blend Mode Previewer
Free CSS blend mode previewer for mix-blend-mode and background-blend-mode values. Compare effects locally.
Open ToolCSS Breadcrumb
Build CSS breadcrumb 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 ToolCSS Input Focus Ring Generator
Free accessible CSS focus ring generator for inputs and buttons. Tune color, width, and offset locally.
Open ToolData Transfer Rate Converter
Free data transfer rate converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolDND Character Stat Roller
Free dnd character stat roller. It rolls six ability scores using four dice and dropping the lowest and keeps entered data private in your browser.
Open ToolDPI PPI Calculator
Free dpi ppi calculator that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolDuplicate Contact Finder
Find likely duplicate contacts from pasted names, emails, or company rows.
Open ToolEaster Date Calculator
Free Easter date calculator: find the date of Easter Sunday for any year using the computus, in your browser.
Open ToolEndianness Converter
Free endianness converter: swap the byte order of a hex value between big-endian and little-endian, in your browser.
Open ToolFAQ Idea Generator
Generate FAQ question ideas from a topic, audience, objections, and buying stage. Useful for SEO pages, posts, and landing pages.
Open ToolGPS Coordinate Converter
Free gps coordinate converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolImage Brightness & Contrast
Adjust image brightness and contrast on a local canvas, preview every change, and download the processed PNG without uploads in your browser.
Open ToolInvoice Email Generator
Generate polite invoice emails for new invoices, payment reminders, overdue notes, and paid confirmations.
Open ToolLine Height Calculator
Free line height calculator: convert between unitless line-height and pixels for a font size, in your browser.
Open ToolManual Currency Converter
Free manual currency converter that uses your entered exchange rate to convert amounts without live financial feeds. Runs locally in your browser for...
Open ToolMarkup Calculator
Free markup calculator that runs locally in your browser.
Open ToolMeal Prep Container Calculator
Calculate meal-prep containers from total food weight and grams per container. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolMeta Robots Bulk Generator
Generate meta robots tags in bulk for URL lists. Choose index, follow, snippets, image previews, and copy implementation-ready output.
Open ToolMidpoint Calculator
Free midpoint calculator: enter two points to get the coordinates of the point exactly halfway between them, computed locally in your browser.
Open ToolOnline Tone Generator
Free online tone generator: play a pure sine, square, sawtooth, or triangle tone at any frequency, in your browser.
Open ToolProject Price Calculator
Free project price calculator that runs locally in your browser.
Open ToolQuote Comparison Table
Free quote comparison table that compares vendor bids by price, score, timeline, and weighted value for easier decisions. Runs locally in your browser for...
Open ToolRobots.txt Tester
Paste robots.txt rules and a path to check whether a user-agent is allowed.
Open ToolROT8000 Text Obfuscator
Free ROT8000 text obfuscator rotates non-whitespace UTF-16 characters and reverses itself. Runs in your browser; no uploads or accounts are used.
Open ToolSales Tax Calculator
Free sales tax calculator that runs locally in your browser.
Open ToolSVG Rating Stars
Generate SVG star rating rows with full, empty, and partially filled stars. Everything runs locally in your browser with nothing uploaded and no account needed.
Open ToolTailwind Color Class Helper
Free tailwind color class helper that runs locally in your browser.
Open ToolUnicode Escape Converter
Free Unicode escape converter for text to slash-u escapes and escapes back to text. Convert snippets locally in your browser.
Open ToolWords With Friends Score Calculator
Free Words With Friends score calculator totals the game tile values for any entered word. Runs in your browser; no uploads or accounts are used.
Open ToolXML Sitemap Validator Lite
Paste an XML sitemap to check parsing, loc tags, duplicate URLs, invalid URLs, and lastmod formatting. Private browser-only validation.
Open Tool3D Distance Calculator
Free 3d distance calculator with labeled inputs and an immediate result. It finds straight-line distance between spatial points privately in your browser.
Open ToolAd Copy Variator
Free ad copy variator that spins one message into benefit, proof, urgency, objection, and direct-response ad angles. Runs locally in your browser for...
Open ToolAdd Line Numbers
Free add line numbers for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolAge Calculator
Free age calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.
Open ToolAI Crawler Robots.txt Builder
Generate robots.txt blocks for common AI crawler user agents.
Open ToolAlpha Compositing Calculator
Use this free alpha compositing calculator in your browser to blend foreground alpha over a background into one opaque hex. Output stays private and local.
Open ToolAmortization Schedule Builder
Free amortization schedule builder that previews monthly principal, interest, balance, and total loan cost. Runs locally in your browser for private planning.
Open ToolAnalogous Color Generator
Free analogous color generator: find neighboring colors on the wheel for a harmonious palette, in your browser.
Open ToolAnimated Gradient Background CSS
Generate animated gradient background CSS in your browser with a live preview and one-click copy. Free, private, and instant in your browser.
Open ToolAnnual to Monthly Cost Converter
Free annual to monthly cost converter for subscriptions, contracts, yearly fees, and equivalent monthly budgets. Runs locally in your browser for private...
Open ToolBearing Calculator
Free compass bearing calculator: find the initial bearing from one coordinate to another, in your browser.
Open ToolBinaural Beats Generator
Free binaural beats generator: play two tones to create a beat frequency for focus or relaxation, in your browser.
Open ToolBlog To Social Post Splitter
Split a pasted blog outline into short social post ideas.
Open ToolBox Shadow Generator
Tune offset, blur, spread, opacity, and color, then copy CSS instantly.
Open ToolBusiness Name Generator
Free business name generator: get descriptive, local, modern, and premium name ideas from your industry, location, and style in seconds, in your browser.
Open ToolCalorie Deficit Planner
Free calorie deficit planner that estimates timeline from pounds to lose, daily deficit, and the classic 3500 calorie shortcut in your browser.
Open ToolCloset Rod Capacity Calculator
Calculate hanger capacity from rod length and spacing per hanger. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolColor Icon Background Pairing
Pair icon colors with soft circular backgrounds for cards, badges, and nav items. Free and private in your browser, with nothing uploaded and no account.
Open ToolColumn Row Transposer
Free row and column transposer for pasted comma, tab, or pipe-delimited text. Swap tables locally without opening a spreadsheet.
Open ToolContraction Expander
Free contraction expander replaces common English apostrophe forms with their full wording. Runs in your browser; no uploads or accounts are used.
Open ToolCPM CPC CPA Converter
Free CPM, CPC, and CPA converter that connects impressions, clicks, conversions, spend, and core ad efficiency metrics. Runs locally in your browser for...
Open ToolCSS Background Position Previewer
Use this free CSS background position previewer in your browser to preview and copy percentage background positioning CSS. Output stays private and local.
Open ToolCSS Corner Smoothing Preview
Free CSS corner smoothing preview for radius and superellipse-style border-radius values. Compare shapes locally.
Open ToolCSS Media Query Builder
Free CSS media query builder for width, orientation, and color scheme conditions. Compose responsive queries locally.
Open ToolCSS Object Fit Previewer
Free CSS object-fit previewer for cover, contain, fill, none, and scale-down. Compare media framing locally.
Open ToolCSS Object Position Previewer
Use this free CSS object position previewer in your browser to preview object positioning independently of object fit. Output stays private and local.
Open ToolCSS Overflow Playground
Free CSS overflow playground for visible, hidden, scroll, auto, and clip values. Preview overflow behavior locally.
Open ToolCSS Range Slider Styler
Free CSS range slider styler for track, thumb, size, and color values. Preview slider CSS locally in your browser.
Open ToolCSS Toggle Switch Generator
Free CSS toggle switch generator for styled checkbox controls. Preview track, thumb, colors, and copy CSS locally.
Open ToolCSV Column Stats
Free CSV column stats tool that calculates count, min, max, average, median, and sum for numeric columns in pasted CSV data locally with copy-ready JSON.
Open ToolCSV Merger
Free CSV merger for combining multiple pasted CSV blocks into one clean file. Preserve one header row and join datasets locally in your browser.
Open ToolDate Difference Calculator
Free date difference calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.
Open ToolDeck Card Draw Odds Calculator
Calculate the single-draw chance of a matching card from deck size and matches. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolEmoji Remover
Free emoji remover that strips emoji and symbols from pasted copy while preserving words, punctuation, and line breaks. Runs locally in your browser for...
Open ToolEvent Schema Builder
Free event schema builder that creates Event JSON-LD with name, dates, venue, address, status, price, and event URL for SEO. Runs locally in browser.
Open ToolFrequency Converter
Free frequency converter: convert between hertz, kilohertz, megahertz, and gigahertz, in your browser.
Open ToolGolden Ratio Calculator
Free golden ratio calculator: enter one value to get the golden-ratio partner and the two segments of a golden division, in your browser.
Open ToolHowTo Schema Builder
Free HowTo schema builder that turns a title, tool list, supply list, and step-by-step instructions into copy-ready JSON-LD. Runs locally in browser.
Open ToolHTML Table Generator
Free html table generator that runs locally in your browser.
Open ToolImage Color Replacer
Use this free image color replacer in your browser to replace pixels near a chosen RGB color using tolerance distance. Output stays private and local.
Open ToolImage Compressor
Free image compressor that re-encodes uploaded photos with a quality slider in your browser, estimates file size, and exports JPEG or WebP copies.
Open ToolImage Filename Cleaner
Free image filename cleaner that runs locally in your browser.
Open ToolImage Histogram
Free image histogram tool that samples uploaded image pixels and charts red, green, and blue channel distribution locally in your browser online.
Open ToolInstagram Save Rate Calculator
Estimate saves and confirm the save rate from impressions and a save percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolInternal Link Counter
Free internal link counter that scans pasted HTML and counts internal links, external links, anchors, duplicate URLs, and nofollow usage. Runs locally.
Open ToolJava String HashCode Calculator
Calculate Java String hashCode from UTF-16 code units with signed decimal and unsigned hexadecimal views, reproduced locally in your browser.
Open ToolJSON Schema Example
Build a small JSON Schema example from field names, types, and required flags. An API docs page can create a schema with id, email, and createdAt fields.
Open ToolJSON to CSV Converter
Convert JSON arrays or objects into copyable CSV locally.
Open ToolKeyword Substitution Cipher
Free keyword substitution cipher builds a deduplicated keyed alphabet for reversible mapping. Runs in your browser; no uploads or accounts are used.
Open ToolKinematics Calculator
Calculate final velocity and displacement from initial velocity, constant acceleration, and elapsed time with results in your browser without uploads.
Open ToolList to Comma-Separated
Free tool to convert a list of lines into a comma-separated string, with optional quotes, in your browser.
Open ToolLorem Ipsum Generator
Generate placeholder paragraphs for mockups and layouts.
Open ToolMagic 8-Ball
Free online Magic 8-Ball: ask a yes-or-no question and get one of the twenty classic answers, drawn in your browser.
Open Toolmicrogram to milligram Converter
Free microgram to milligram converter with exact mass math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolMoving Box Volume Calculator
Calculate total moving-box volume from a box count and volume each. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolMurmurHash3 32-bit Generator
Calculate MurmurHash3 x86 32-bit output from UTF-8 text and a numeric seed, with exact tail and finalization steps run in your browser safely now.
Open ToolNDA Generator
Draft a one-way or mutual NDA with party names, effective date, disclosure purpose, confidentiality term, and formatted local text output in your browser.
Open ToolOffer Stack Builder
Free offer stack builder that organizes core offer, bonuses, proof, guarantee, urgency, and total value for sales pages. Runs locally in your browser for...
Open ToolPaint Quantity Calculator
Free paint calculator: enter wall dimensions, coats, and coverage to estimate how many litres or gallons of paint you need, in your browser.
Open ToolPassword Generator
Generate strong random passwords locally with configurable length and character sets.
Open ToolPercent Encoding Table
Free percent encoding table that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolPlayfair Cipher
Free Playfair cipher processes keyed letter pairs through a five-by-five square for both directions. Runs in your browser; no uploads or accounts are used.
Open ToolPrefix Suffix Adder
Free prefix suffix adder for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolPrint Size Calculator
Free print size calculator that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolProduct Description Formatter
Format rough product notes into benefits, details, use cases, and care notes.
Open ToolProduct Name Generator
Free product name generator that combines roots, benefits, suffixes, and style choices into practical naming ideas. Runs locally in your browser for private...
Open ToolQuote Extractor
Extract short quotable lines from pasted notes, testimonials, interviews, or article drafts.
Open ToolReaction Time Test
Measure your reaction time across five rounds with too-early click detection, average milliseconds, and a personal best saved in your browser.
Open ToolRecipe Schema Builder
Free recipe schema builder that creates Recipe JSON-LD with ingredients, instructions, prep time, cook time, yield, and image fields. Runs locally.
Open ToolRefinance Break-Even Calculator
Free refinance break-even calculator that compares monthly savings, closing costs, and months to recover fees. Runs locally in your browser for private...
Open ToolREM PX Converter
Convert pixels to rem and rem to pixels with a configurable base font size.
Open ToolResignation Letter Generator
Create a resignation letter from your name, company, last working day, and tone choice with local preview, copy output, and printing in your browser.
Open ToolRoman Numeral Date Converter
Free Roman numeral date converter: write any date in Roman numerals, the way monuments and film credits do, in your browser.
Open ToolSDBM Hash Generator
Calculate the 32-bit SDBM hash recurrence from UTF-8 bytes with unsigned overflow and copy-ready non-security output in your browser safely now.
Open ToolSlugify Text
Free slug generator: turn any title into a clean, URL-friendly slug with accents removed, computed locally in your browser.
Open ToolSocial Banner Sizer
Free social banner sizer that fits uploaded artwork into common platform canvas sizes and exports ready-to-post PNG previews locally in browser.
Open ToolSolid Color Image Generator
Free solid color image generator: create a plain coloured image of any size, downloadable as PNG, in your browser.
Open ToolSubscription Audit Worksheet
Generate a SaaS subscription audit worksheet for cost, owner, usage, renewal, and cancellation review.
Open ToolSunrise Sunset Calculator
Free sunrise sunset calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.
Open ToolSVG Circuit Pattern Generator
Generate SVG circuit pattern in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolSVG Drop Shadow Filter
Create SVG drop shadow filter in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolSVG Gauge Icon
Generate SVG gauge icons with arc range, needle angle, and accent color. A performance metric can show a speedometer-style symbol next to the score.
Open ToolSVG Topography Pattern Generator
Generate SVG topography pattern in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.
Open ToolText Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case.
Open ToolText to Speech
Free text to speech in your browser: paste text and listen with natural-sounding AI voices where your browser offers them. Adjust speed and pitch, no sign-up.
Open ToolThread Splitter
Free thread splitter that breaks long text into numbered posts with character targets for X, Threads, or LinkedIn. Runs locally in your browser for private...
Open ToolTic-Tac-Toe
Play tic-tac-toe against an unbeatable minimax opponent or a second player with win detection, highlighted lines, reset, and local scorekeeping.
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