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.
Text to HTML Paragraph Converter
Free text to html paragraph converter that runs locally in your browser.
Open ToolTime Duration Converter
Free time duration converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolTime Zone Converter
Free time zone converter that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output. No account required.
Open ToolTriadic Color Calculator
Free triadic color calculator: find three evenly spaced colors from any hex, with swatches, in your browser.
Open ToolTriadic/Tetradic Palette Builder
Free triadic and tetradic palette builder that rotates hue into balanced color-wheel schemes with copy-ready hex output.
Open ToolTriangular Number Calculator
Free triangular number calculator with labeled inputs and an immediate result. It calculates the nth triangular number privately in your browser.
Open ToolTwo’s Complement Converter
Free two’s complement converter: turn a signed decimal into its binary and hex representation at 8–64 bits, and decode binary back, in your browser.
Open ToolTyping Speed Test
Free typing speed test that measures WPM, accuracy, and progress against a sample paragraph directly in your browser.
Open ToolUnit Price Comparator
Free unit price comparator that compares package prices by size, unit cost, and best-value option. Runs locally in your browser for private planning.
Open ToolUS Teaspoons to Milliliters
Convert US teaspoons to milliliters and milliliters to US teaspoons with precise customary-volume results and a quick table in your browser.
Open ToolUser Agent Parser
Free user-agent parser that estimates browser, operating system, rendering engine, and device hints from a UA string locally.
Open ToolUTF-8 Byte Counter
Free UTF-8 byte counter: measure characters, bytes, words, and lines of any text, computed locally in your browser.
Open ToolUTM Cleanup Tool
Clean pasted UTM URLs and normalize common campaign parameter formatting.
Open ToolUUID Generator
Generate one or many random v4 UUIDs locally in your browser and copy them instantly.
Open ToolValue-Based Pricing Helper
Free value-based pricing helper that estimates a fair project price range from client upside, confidence, and risk. Runs locally in your browser for private...
Open ToolVideoObject Schema Builder
Free VideoObject schema builder that creates JSON-LD with title, description, thumbnail, upload date, duration, and embed URL fields. Runs locally.
Open ToolWavelength ↔ Frequency
Free wavelength and frequency converter: enter one to get the other for light in a vacuum using c = λf, computed locally in your browser.
Open ToolWeek of the Month Calculator
Free week of the month calculator: find which week of the month a date falls in, computed locally in your browser.
Open ToolWeight Mass Converter
Free weight mass converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolWhite Noise Generator
Free white noise generator: play soothing white noise for focus or sleep, generated in your browser.
Open ToolWilks Calculator
Calculate a classic Wilks coefficient and score from bodyweight, lifted total, and coefficient category in kilograms, privately in your browser.
Open ToolXML Formatter
Free xml formatter that runs locally in your browser.
Open ToolXML Sitemap Builder
Free XML sitemap builder that turns a pasted URL list into valid sitemap XML with lastmod, changefreq, priority, and browser-only output. Runs locally.
Open ToolYAML Linter Lite
Free lightweight YAML linter that flags tabs, odd indentation, and common key spacing mistakes locally in your browser.
Open ToolYAML to JSON Converter
Free yaml to json converter that runs locally in your browser.
Open Toolyear to day Converter
Free year to day converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open Tool3x3 System of Equations Solver
Free 3x3 system of equations solver using Cramer determinants to find x, y, and z from an augmented matrix, calculated privately in your browser.
Open ToolA1C Average Glucose Converter
Convert A1C to estimated average glucose using the ADAG formula. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolA1C to Average Glucose Converter
Free a1c to average glucose converter with labeled inputs and an immediate result. It estimates eAG from a laboratory A1C percentage privately in your browser.
Open ToolAcceptable Use Policy
Create an acceptable use policy with service name, prohibited-use checkboxes, enforcement language, reporting path, and copyable terms in your browser.
Open ToolAffiliate Commission Calculator
Calculate affiliate commission and the merchant share from an order value and commission rate. It runs entirely in your browser, with no uploads or accounts.
Open ToolAge Difference Calculator
Free age difference calculator: find the gap in years and days between two birth dates, computed in your browser.
Open ToolAlberti Cipher Disk
Free Alberti cipher disk rotates a movable alphabet by interval, offset, and step controls. Runs in your browser; no uploads or accounts are used.
Open ToolAngle Converter
Free angle converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open Toolangstrom to nanometer Converter
Free angstrom to nanometer converter with exact length math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolAnnual Contract Value Calculator
Calculate total and annual contract value from a monthly amount and a term. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolApache Htaccess Redirect
Build apache htaccess redirect in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolApache Redirect Rule
Build Apache Redirect and RewriteRule snippets for common path moves. A legacy product URL can redirect permanently to a new canonical page.
Open ToolAPR to APY Converter
Convert APR to APY with a manual compounding frequency so savings and loan rates can be compared. It runs entirely in your browser, with no uploads or accounts.
Open ToolAria Live Region Snippet
Build polite and assertive aria-live region snippets for status messages. Everything runs locally in your browser with nothing uploaded and no account needed.
Open ToolArmy Body Fat Calculator
Free U.S. Army body fat calculator using the circumference method, computed locally in your browser.
Open ToolARR Calculator
Free annual recurring revenue calculator: convert MRR to ARR and see monthly and daily figures, in your browser.
Open ToolAtmospheres to PSI Converter
Convert standard atmospheres to PSI and PSI to atmospheres using the exact reference pressure, with six-significant-figure results in your browser.
Open ToolAudience Overlap Calculator
Estimate the shared and unique members of an audience from a size and an overlap percentage. It runs entirely in your browser, with no uploads or accounts.
Open ToolAudio Buffer Size Calculator
Calculate audio latency from a buffer size in samples and the sample rate. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolAverage Revenue Per User Calculator
Calculate ARPU by dividing total revenue by the number of users. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolBAB Copy Framework Builder
Free BAB copy framework builder that maps before, after, and bridge sections for landing pages, emails, and ads. Runs locally in your browser for private...
Open ToolBandwidth Delay Product
Free bandwidth delay product calculator that multiplies link rate by round-trip time and reports exact bits, bytes, and MiB in your browser.
Open ToolBar Duration Calculator
Calculate the duration of a bar from beats per bar and the tempo. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolBarista FIRE Gap Calculator
Calculate the portfolio needed after part-time income reduces annual expenses. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolBase32 Encoder & Decoder
Free Base32 encoder and decoder using the RFC 4648 alphabet, computed locally in your browser.
Open ToolBase32 Encoder Decoder
Free Base32 encoder and decoder for RFC 4648 text values. Convert strings locally with padding support in your browser.
Open ToolBase58 Encoder Decoder
Free Base58 encoder and decoder using the Bitcoin alphabet. Convert text values locally without ambiguous characters.
Open ToolBase64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to readable text with Unicode support.
Open ToolBase64 File Converter
Free base64 file converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolBase64 to Image Converter
Free Base64 to image converter: paste a Base64 or data URI and preview and download the image, in your browser.
Open ToolBase91 Encoder and Decoder
Encode UTF-8 text as compact basE91 or decode valid basE91 back to text with strict local validation and one-click copying in your browser safely now.
Open ToolBasic Auth Header Generator
Free Basic auth header generator that UTF-8 encodes a username and password, joins them correctly, and returns Base64 without uploads in your browser.
Open ToolBeat Duration Calculator
Calculate the duration of one beat from the tempo in BPM. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open Toolbeat/minute to hertz Converter
Free beat/minute to hertz converter with exact frequency math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolBefore After Copy Rewriter
Turn plain offer copy into before-after messaging with pain, desired outcome, bridge, and CTA drafts. Runs locally.
Open ToolBifid Cipher
Free Bifid cipher fractionates keyed Polybius coordinates and recombines them by period. Runs in your browser; no uploads or accounts are used.
Open ToolBinary Text Converter
Free binary text converter for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.
Open ToolBinomial Probability Calculator
Free binomial probability calculator: find the chance of k successes in n trials at probability p, in your browser.
Open ToolBirthday Paradox Calculator
Free birthday paradox calculator: find the probability that two people in a group share a birthday, in your browser.
Open ToolBirthstone Lookup
Free birthstone lookup: find the traditional and modern birthstone for any birth month, in your browser.
Open ToolBitrate Calculator
Free bitrate calculator that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolBitwise Calculator
Free bitwise calculator: apply AND, OR, XOR, NOT, and shifts to two integers and see the result in decimal, binary, and hex, in your browser.
Open ToolBreakage Revenue Calculator
Estimate breakage revenue and expected redemptions from a balance and a breakage rate. It runs entirely in your browser — no uploads or accounts.
Open ToolBroken Internal Link List Cleaner
Clean messy broken-link crawl exports into deduplicated fix lists grouped by source URL, target URL, and status code.
Open ToolBug Report Template Generator
Generate a clear bug report template with steps to reproduce, expected result, actual result, severity, and environment.
Open ToolBusiness Days Calculator
Free business days calculator that calculates dates and times locally in your browser with specific examples, limits, and copy-ready output.
Open ToolCabinet Paint Area Calculator
Calculate total cabinet door area from a door count and average area each. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolCabinet Pull Placement Calculator
Calculate the pull center position on a drawer from width and a placement percentage. It runs entirely in your browser — no uploads or accounts.
Open ToolCAC Payback Period Calculator
Free cac payback period calculator with labeled inputs and an immediate result. It estimates months to recover acquisition cost privately in your browser.
Open ToolCache-Control Header Builder
Free Cache-Control header builder that safely validates visibility, freshness, revalidation, immutable, no-store, and stale reuse in your browser.
Open ToolCAGR Calculator
Free CAGR calculator: find the compound annual growth rate of an investment over time, computed locally in your browser.
Open ToolCampaign Budget Split Calculator
Split a campaign budget across creative, media, landing pages, testing, tools, and contingency.
Open ToolCap Rate Calculator
Free capitalization rate calculator: find a property’s cap rate from net operating income and value, in your browser.
Open ToolCapacitor Code Decoder
Free capacitor code decoder: enter a three-digit ceramic capacitor code to get the capacitance in pF, nF, and µF, computed locally in your browser.
Open ToolCapacitor Energy Calculator
Free capacitor energy calculator: find the energy stored in a capacitor from capacitance and voltage, computed in your browser.
Open ToolCapacitors in Parallel Calculator
Calculate equivalent capacitance for a positive list of parallel capacitor values, with count and total computed locally in your browser safely now.
Open ToolCase Conversion
Transform case conversion 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 ToolCash Drawer Counter
Free cash drawer counter: enter the count of each bill and coin to total the till, computed locally in your browser.
Open Toolchain to meter Converter
Free chain to meter converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open ToolCharacter Counter Pro
Count characters, words, sentences, paragraphs, and bytes.
Open ToolChi-Square Goodness-of-Fit
Free chi-square goodness-of-fit with labeled inputs and an immediate result. It compares observed and expected category counts privately in your browser.
Open ToolCholesterol Unit Converter
Free cholesterol unit converter with labeled inputs and an immediate result. It converts cholesterol from mg/dL to mmol/L privately in your browser.
Open ToolChurn Calculator
Free churn calculator that runs locally in your browser.
Open ToolCIDR Calculator
Free CIDR calculator: convert a prefix length to its subnet mask, wildcard mask, and address and host counts, and see the full prefix table, in your browser.
Open ToolCIDR Containment Checker
Free CIDR containment checker that tests whether an IPv4 address or complete child CIDR lies inside a parent range with full range math in your browser.
Open ToolCIDR Overlap Checker
Free CIDR overlap checker that normalizes two IPv4 blocks, detects intersection, and reports the exact shared address range in your browser.
Open ToolClass Attendance Percent Calculator
Calculate meetings attended and missed from total meetings and an attendance rate. It runs entirely in your browser — no uploads or accounts.
Open ToolCMYK ↔ RGB Converter
Free CMYK and RGB converter: switch a color between print CMYK percentages and screen RGB or hex values, computed locally in your browser.
Open ToolCocktail Batch Calculator
Scale cocktail ingredient ounces by servings and dilution percent. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolCohen D Effect Size Calculator
Free cohen d effect size calculator with labeled inputs and an immediate result. It standardizes a two-group mean difference privately in your browser.
Open ToolColor Alpha Overlay
Preview a foreground color over a background at different alpha levels with a live preview and one-click copy. Free and private — nothing is uploaded.
Open ToolColor Data Viz Qualitative Palette
Generate distinct qualitative colors for charts with unrelated categories. Everything runs locally in your browser with nothing uploaded and no account needed.
Open ToolColor Design Token Builder
Build named color tokens with base, accent, surface, and mode controls. Preview component swatches and copy CSS variables privately in your browser.
Open ToolColor Gradient Stop Normalizer
Normalize gradient stop positions so stops are sorted and evenly spaced when needed. Free and private in your browser, with nothing uploaded and no account.
Open ToolColor Monochrome Scale
Generate a monochrome scale from one hue for UI surfaces and accents with a live preview and one-click copy. Free and private — nothing is uploaded.
Open ToolColor Muted Palette
Generate muted palettes for enterprise dashboards, docs, and calm interfaces. Free and private in your browser, with nothing uploaded and no account.
Open ToolColor Picker Formats
Free color picker that converts one picked color into HEX, RGB, HSL, HWB, and OKLCH-style values for fast CSS handoff.
Open ToolColor Safe Status Palette
Generate color safe status palette in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.
Open ToolColor Table Row Striping Palette
Build alternating table row colors from a base surface and border color. A data table can use subtle striped rows without reducing text contrast.
Open ToolColor Tag Chip Palette
Build tag and chip colors for filters, labels, and status metadata with a live preview and one-click copy. Free and private — nothing is uploaded.
Open ToolColor Toast State Palette
Generate toast colors for success, warning, error, info, and neutral messages. Free and private in your browser, with nothing uploaded and no account.
Open ToolColor Transparent Swatch Mixer
Preview transparent color overlays on light and dark surfaces. A black 12 percent overlay can be tested against white and slate backgrounds at once.
Open ToolCombinations with Repetition
Free combinations with repetition calculator: count multiset selections from n items, in your browser.
Open ToolCombined Gas Law Calculator
Free combined gas law calculator: solve P1V1/T1 = P2V2/T2 for a missing value, in your browser.
Open ToolCompound Interest Calculator
Free compound interest calculator with starting balance, contributions, rate, years, and future value estimates. Runs locally in your browser for private...
Open ToolContent Brief Generator
Turn a topic into a simple SEO content brief and outline.
Open ToolContent Calendar Idea Planner
Generate content calendar ideas with themes, formats, calls to action, and weekly publishing structure.
Open ToolContraction MRR Calculator
Calculate contraction MRR and the remaining MRR from downgrades. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolContractor Day Rate Calculator
Calculate a contractor day rate from a project budget and billable days. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolCooking Measurement Converter
Free cooking measurement converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open Toolcord to cu foot Converter
Free cord to cu foot converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open ToolCountdown Progress Calculator
Calculate days elapsed and remaining from a total and an elapsed percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolCRC32 Calculator
Free CRC32 calculator for text snippets. Generate a standard hexadecimal CRC32 checksum locally in your browser.
Open ToolCredit Card Payoff Calculator
Free credit card payoff calculator that estimates months and interest from balance, APR, and monthly payment. Runs locally in your browser for private planning.
Open ToolCredit Card Validator
Free credit card number validator: check a card number with the Luhn algorithm and detect the network, all locally with nothing stored or uploaded.
Open ToolCron Builder Visual
Free visual cron builder that combines minute, hour, day, month, and weekday fields into a cron expression locally.
Open ToolCrontab Line Generator
Free crontab line generator for combining schedule fields with a command and optional output redirection locally.
Open ToolCrypto Profit Loss Calculator
Calculate crypto profit, ROI, and ending value from buy price, sell price, and quantity manually. It runs entirely in your browser, with no uploads or accounts.
Open ToolCSP Directive
Work with CSP directive 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 ToolCSP Header Builder
Free Content-Security-Policy builder: pick sources for each directive to assemble a valid CSP header string, generated locally in your browser.
Open ToolCSS Accent Color Previewer
Use this free CSS accent color previewer in your browser to preview and copy accent-color CSS for native form controls. Output stays private and local.
Open ToolCSS Admin Shell
Build CSS admin shell 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 Backdrop Filter Generator
Free CSS backdrop filter generator for blur, brightness, saturation, and translucent panels. Preview glass effects locally.
Open ToolCSS Background Size Previewer
Use this free CSS background size previewer in your browser to preview cover contain or explicit background sizing CSS. Output stays private and local.
Open ToolCSS Border Image Generator
Use this free CSS border image generator in your browser to build gradient border-image CSS with slice, width, and repeat. Output stays private and local.
Open ToolCSS Border Image Gradient
Generate border-image gradient CSS for panels and callout boxes. A pricing card can use a blue-to-green gradient border without an extra wrapper.
Open ToolCSS Brand Token Preview
Preview CSS brand token 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 ToolCSS Breakout Container
Create full-bleed breakout CSS for images inside constrained article layouts. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Button Generator
Free css button generator that runs locally in your browser.
Open ToolCSS Card Component
Build CSS card component 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 ToolCSS Case Study Card
Build CSS case study card 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 ToolCSS Checkbox Radio Styler
Free CSS checkbox and radio styler for custom form controls. Preview accent colors, borders, and focus styles locally.
Open ToolCSS Color Scheme
Generate color-scheme and supported theme hints for form controls and scrollbars. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Column Layout
Build multi-column layout CSS with column count, width, and gap controls. Everything runs locally in your browser with nothing uploaded and no account needed.
Open ToolCSS Conic Pattern
Build CSS conic pattern 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 ToolCSS Content Visibility
Generate content-visibility and contain-intrinsic-size rules for below-fold sections. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Cubic Bezier Editor
Free CSS cubic-bezier editor for easing curves. Adjust control points, preview motion, and copy easing CSS locally.
Open ToolCSS Custom Property Scope
Preview how CSS custom properties inherit from root, section, and component scopes. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Drop Cap
Generate fallback drop-cap CSS with first-letter, float, line-height, and margin. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Dynamic Viewport Units Comparer
Compare svh, lvh, and dvh viewport units for mobile hero and panel sizing. A mobile drawer can use 100dvh so it follows the visible browser chrome.
Open ToolCSS Error Summary
Build CSS error summary 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 ToolCSS File Selector Button
Style file input buttons using ::file-selector-button with colors and spacing. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS File Upload Dropzone
Build CSS file upload dropzone in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolCSS Font Face Generator
Use this free CSS font face generator in your browser to build font-face CSS with source, format, weight, style, and display. Output stays private and local.
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