Free browser utilities

All KitBox Tools

Find a tool for text, code, calculations, images or network information.

156 tools

301 Redirect GeneratorGenerate a single exact-path Apache redirect rule with escaped pattern characters.Activity Calorie EstimateEstimate activity energy from a chosen MET value, body weight and time.Add Line Numbers to TextOpen the Add Line Numbers to Text.Add Prefix & Suffix to LinesOpen the Add Prefix & Suffix to Lines.Adult BMI CalculatorCalculate BMI from kilograms and centimetres using adult screening categories.Age CalculatorCalculate completed years and elapsed days at a chosen date.Alphabetical Line SorterOpen the Alphabetical Line Sorter.Area ConverterConvert area values using explicitly named units.ASCII & Unicode Code ConverterEncode text as decimal, binary or hexadecimal code points, or decode the values.ASCII Banner GeneratorRender A–Z and digits as a five-by-seven text banner.Aspect Ratio CalculatorFind an image ratio and calculate a matching height for a new width.Bandwidth & Data Usage CalculatorEstimate transferred data from a sustained transfer speed and active usage time.Base64 Encoder & DecoderEncode UTF-8 text or decode Base64 explicitly, with hexadecimal output for binary bytes.Binary, Octal, Decimal & Hex ConverterOpen the Binary, Octal, Decimal & Hex Converter.Border Radius GeneratorCreate four corner radii and preview the result.Browser Link Status CheckerAttempt HEAD requests to up to ten public URLs and report observable HTTP status.Canonical Tag GeneratorGenerate a canonical link element from a validated HTTP(S) URL.Color Contrast CheckerCompare two opaque colors against WCAG text contrast thresholds.Color Palette GeneratorSuggest a five-color hue palette from a HEX color.Color Shade & Tint GeneratorCreate a lightness scale from a validated HEX color.Common Network Port ReferenceLook up common service port numbers and transport protocols.Compound Interest CalculatorCalculate compound growth with an optional contribution at the end of each compounding period.Conservative HTML MinifierRemove HTML comment nodes while preserving text whitespace and raw script/style content.Cron Expression GeneratorBuild a validated five-field cron schedule and a single-line command.CSS Box Shadow GeneratorBuild and preview a CSS shadow with separate offset, blur and spread.CSS Button GeneratorCreate a button style with editable color, padding and corner radius.CSS Cursor ReferencePreview common CSS cursors and copy the declaration.CSS Filter GeneratorBuild blur, brightness, contrast and grayscale CSS filters.CSS Flexbox PlaygroundOpen the CSS Flexbox Playground.CSS Font Size ConverterConvert px, rem, em and typographic points with explicit base sizes.CSS Gradient GeneratorCreate and preview linear or radial two-color gradients.CSS Grid GeneratorPreview a repeated column grid and copy its CSS.CSS MinifierMinify CSS with a syntax-aware parser.CSS PX to REM / EM ConverterOpen the CSS PX to REM / EM Converter.CSS Transform GeneratorBuild a translate, rotate and scale transform.CSS Triangle GeneratorGenerate a border-based triangle in the selected direction.CSV to JSON ConverterConvert header-based CSV while correctly handling quoted commas, quotation marks and multiline values.Daily Water Goal PlannerTranslate your chosen total-water goal into a beverage amount and glass count.Data Transfer Rate ConverterConvert transfer values using explicitly named units.Days Between DatesCalculate elapsed calendar days between two dates without daylight-saving shifts.Digital Storage ConverterConvert storage values using explicitly named units.Discount CalculatorCalculate the savings and final price after a percentage discount.DNS Record LookupQuery public DNS records through Cloudflare’s DNS-over-HTTPS service.Download Time CalculatorEstimate ideal transfer duration.Email Address ExtractorOpen the Email Address Extractor.Favicon HTML GeneratorGenerate an icon link for an existing PNG image URL.Find & Replace Text OnlineOpen the Find & Replace Text Online.Flexbox CheatsheetGenerate a small Flexbox reference for alignment, wrapping and gaps.Glassmorphism CSS GeneratorCreate a translucent surface with backdrop blur.Grayscale Image ConverterConvert a decoded image to grayscale PNG.GST, VAT & Sales Tax CalculatorAdd a tax rate or extract tax already included in a price.H1 Heading CheckerInspect H1 elements in pasted HTML without fetching a website.HEIC to JPGConvert supported HEIC images locally.HEX to RGB & HSL ConverterValidate HEX colors and convert them to RGB, HSL and alpha values.HTML Entity Encoder & DecoderEncode special HTML characters or decode semicolon-terminated entities.HTML Table GeneratorOpen the HTML Table Generator.HTML Tag StripperExtract text using an HTML parser, including tags with quoted angle brackets.HTML, CSS & JavaScript MinifierChoose the code language and use its dedicated parser.HTTP Status Code LookupSearch a short reference of common HTTP response status codes.HTTP Status Codes ReferenceOpen the HTTP Status Codes Reference.Image Brightness & ContrastAdjust brightness and contrast separately and export PNG.Image CompressorCompress JPG, PNG and WebP files in your browser.Image Dimensions CheckerRead decoded width, height and source file size.Image Palette ExtractorEstimate dominant colors from a resized local image sample.Image Pixel Color PickerRead the exact RGBA value at a chosen decoded-image coordinate.Image ResizerResize an image with an optional locked aspect ratio.Image Rotator & FlipperRotate by a quarter turn and optionally flip the source image.Image to Base64 EncoderEncode a validated local image as a data URL.Image to JPEG ConverterConvert a decoded image to JPEG with a white transparency background.Image to PNG ConverterDecode a supported image and export a PNG file.Image to WebP ConverterConvert a decoded image to WebP at your selected quality.IP & Browser Connection InspectorInspect available browser connection information and optionally look up your public IP.IPv4 Subnet CalculatorCalculate network, mask, broadcast and host range from an IPv4 address and CIDR prefix.JavaScript MinifierRemove unnecessary syntax spacing using a JavaScript parser while preserving strings.JPG to PDFPlace images on PDF pages while keeping their proportions.JSON Formatter & BeautifierValidate and format JSON while preserving large numeric literals.JSON to CSV ConverterConvert an array of JSON objects to correctly quoted CSV.JSON to YAML ConverterConvert JSON types, scalar values and empty containers with a YAML serializer.JSON-LD Schema Markup GeneratorOpen the JSON-LD Schema Markup Generator.JWT DecoderDecode the header and payload of a three-part JWT locally.Keyboard Event InspectorFocus the capture field and press a key to inspect its event properties.Keyword ExtractorFind frequently repeated words after filtering common English words.Keyword Idea HelperExpand a topic into informational and comparison search ideas.Length ConverterConvert length values using explicitly named units.Loan Payment CalculatorCalculate a fixed monthly payment from principal, annual interest and a positive term.Lorem Ipsum GeneratorGenerate a chosen word count or a set of placeholder paragraphs.MAC Address FormatterValidate and format a 48-bit MAC address.Markdown Preview & HTML ConverterPreview sanitized Markdown and copy the resulting HTML.MD5 Checksum GeneratorCalculate a legacy MD5 text checksum.Merge PDFCombine pages from local PDF files.Meta Tag AnalyzerInspect title, description and social metadata.Morse Code TranslatorOpen the Morse Code Translator.Network Latency SimulatorGenerate labelled latency samples from a base value and maximum jitter.Neumorphism Shadow GeneratorCreate paired light and dark shadows from a background color.Number to WordsWrite signed numbers and decimal digits in English words.Online StopwatchMeasure elapsed time with pause, resume, reset and laps.Opacity ConverterConvert an opacity fraction, percentage and hexadecimal alpha byte.Password GeneratorCreate random passwords with Web Crypto.Password Strength CheckerCheck length, repetition and predictable patterns.PDF to JPGRender PDF pages as images.Percentage CalculatorCalculate a percentage of a value, a ratio, a percentage change or an adjusted total.Pomodoro Focus TimerRun a focus or break countdown with pause, resume and reset.QR Code GeneratorCreate QR images locally.Random Integer GeneratorGenerate random whole numbers with an optional no-repeat setting.Reading Time CalculatorEstimate reading duration using an adjustable reading speed.Regular Expression TesterTest JavaScript patterns in a worker with a bounded execution time.Remove Duplicate LinesOpen the Remove Duplicate Lines.Remove Extra SpacesCollapse repeated horizontal whitespace while retaining line breaks.Remove Line BreaksReplace line breaks with spaces and clean repeated spaces.Reverse TextReverse visible characters without splitting emoji or combined characters.Robots.txt GeneratorCreate a robots.txt draft with a sitemap URL and optional disallowed paths.Roman Numeral ConverterConvert whole numbers 1–3999 to standard Roman numerals, or convert numerals back.Scientific CalculatorEvaluate arithmetic, powers, factorials and supported scientific functions.Search Snippet PreviewPreview a title, URL and description with character counts.Semester GPA CalculatorCalculate a credit-weighted GPA using the displayed 4.0 scale.SEO & Social Meta Tag GeneratorGenerate safely escaped title, description, canonical and social tags.SHA-1 Text Hash GeneratorCalculate a SHA-1 digest from exact UTF-8 text.SHA-256 Text Hash GeneratorCalculate a SHA-256 digest from exact UTF-8 text.SHA-512 Text Hash GeneratorCalculate a SHA-512 digest from exact UTF-8 text.Sleep Schedule EstimateCalculate a bedtime from a wake time and explicit cycle-length assumptions.Speed ConverterConvert speed values using explicitly named units.SQL FormatterFormat SQL while preserving quoted values and identifiers.SQL INSERT GeneratorGenerate INSERT rows from JSON objects with the requested column order.SQL INSERT to JSON ConverterParse quoted INSERT values, multiple rows and repeated statements without splitting strings at commas.SVG Code Cleaner & OptimizerSanitize and optimize SVG source locally.SVG Dot Pattern GeneratorGenerate a tiled dot pattern as SVG source with a live preview.SVG to CSS Background ConverterOpen the SVG to CSS Background Converter.Temperature ConverterConvert temperature values using explicitly named units.Text & Binary ConverterConvert text to UTF-8 binary bytes and decode binary back to text.Text Case ConverterConvert text to uppercase, lowercase, title case, sentence case or inverted case.Text Diff CheckerCompare complete line sequences, including inserted or appended lines.Text HighlighterRecognise and highlight English text in images and PDFs.Text Readability MetricsInspect sentence length, word length and estimated reading time.Time ConverterConvert time values using explicitly named units.Tip CalculatorCalculate a tip and divide the total between people.Trip Fuel Cost CalculatorEstimate fuel use and cost from distance, consumption and price.Unit ConverterConvert length, weight, temperature, speed, time and data units.Unix Permission CalculatorConvert owner, group and other permissions to octal and symbolic forms.Unix Timestamp ConverterConvert a Unix timestamp to UTC or an ISO date/time to a timestamp.Upside Down TextReverse text and map supported letters to upside-down Unicode characters.URL Encoder & DecoderEncode a URL component or decode percent-encoded text.URL Extractor from TextOpen the URL Extractor from Text.URL ParserInspect URL components and preserve repeated query parameters.URL Slug GeneratorTurn a heading into a clean lowercase URL slug.User-Agent String ParserIdentify common browser and operating-system hints in a user-agent string.UTM Campaign URL BuilderBuild campaign parameters while preserving existing URL parameters and fragments.UUID v4 GeneratorGenerate random UUIDs with your browser’s Web Crypto source.Volume ConverterConvert volume values using explicitly named units.Weight ConverterConvert weight values using explicitly named units.Word & Character CounterCount words, Unicode characters, sentences, paragraphs and lines.Word Frequency & DensityCount repeated words and their percentage of all words.Word, Character & Text AnalyzerOpen the Word, Character & Text Analyzer.XML FormatterFormat valid XML with indentation and preserved text content.XML Sitemap GeneratorGenerate valid escaped sitemap XML from one URL per line.XML Sitemap ValidatorCheck sitemap XML structure, location syntax and duplicate URLs.Z-index Scale ReferenceCopy an example layering scale and an editable positioned element.