# WebToolWorld > Free, private, browser-based developer, finance and utility tools. Everything runs client-side — nothing you paste is uploaded, and no account is required. Each tool page includes a plain-language explanation, worked examples and FAQs. We also publish browser extensions and a blog explaining how the tools work. ## Developer Tools - [Multiline Slug Generator](https://webtoolworld.com/slugify/multiline): Convert multiple lines of text into URL slugs at once. Paste a list of titles, headings, or phrases and get all slugs generated instantly — one per line. - [Cron with Seconds (6-Field) Generator & Analyzer](https://webtoolworld.com/cron/cron-seconds): Build and analyze 6-field cron expressions with a seconds field — the format used by node-cron, Quartz and other application schedulers. Get plain-English expla... - [JSON Formatter & Beautifier](https://webtoolworld.com/json-formatter): Format, beautify and validate JSON instantly. Get the exact line and column of any error, duplicate-key warnings, and a full structure breakdown — all in your b... - [JSON Validator](https://webtoolworld.com/json-validator): Check whether JSON is valid and get the exact line, column and reason for any error — with a one-click repair for the common mistakes. Runs entirely in your bro... - [Quartz Cron Expression Generator & Analyzer](https://webtoolworld.com/cron/cron-quartz): Build and analyze Quartz scheduler cron expressions, including the seconds and year fields and the L, W and # operators. Get plain-English explanations and the... - [JSON Diff — Compare JSON Online](https://webtoolworld.com/json-diff): Compare two JSON documents online and see exactly what changed. Added, removed and changed values with their paths, order-insensitive for objects. Runs in your... - [URL Slug Generator](https://webtoolworld.com/slugify): Convert any text into clean, SEO-friendly URL slugs instantly. Customize with options to use underscores, remove numbers, strip stop words, and limit slug lengt... - [JSON Minifier](https://webtoolworld.com/json-minifier): Compress JSON to the smallest valid form by stripping whitespace, and see exactly how many bytes and what percentage you saved. Lossless and fully browser-based... - [URL Parser & Query String Splitter](https://webtoolworld.com/url-parser): Parse any URL into its components and split query strings into key-value pairs. Decode encoded values, sort parameters, and build custom query strings. - [JSON Viewer](https://webtoolworld.com/json-viewer): Explore JSON as an interactive, collapsible tree. Expand and collapse nodes, navigate large payloads with ease, and switch to formatted text any time. Entirely... - [JSON to CSV Converter](https://webtoolworld.com/json-to-csv): Convert JSON to CSV online. Flatten nested objects into dotted columns, control how arrays expand, and download clean, Excel-ready CSV — all in your browser. - [URL Encode Online](https://webtoolworld.com/url-encode): Encode text into URL-safe format instantly. Convert special characters, spaces, and unicode to percent-encoded values for use in URLs and query strings. - [URL Decode Online](https://webtoolworld.com/url-decode): Decode percent-encoded URLs back to readable text instantly. Convert %20, %26, and other encoded characters to their original form. - [CSV to JSON Converter](https://webtoolworld.com/csv-to-json): Convert CSV to JSON online. Auto-detects the delimiter, infers numbers, booleans and nulls, handles quoted fields, and outputs a clean array of objects — in you... - [JSON to YAML Converter](https://webtoolworld.com/json-to-yaml): Convert JSON to YAML online. Produces clean block-style YAML and automatically quotes ambiguous values (yes, 007) so nothing changes type. Runs in your browser. - [Base64 Encode Online](https://webtoolworld.com/base64encode): Encode text and files to Base64 format instantly. Convert any string or file content into a Base64-encoded representation for safe data transmission. - [YAML to JSON Converter](https://webtoolworld.com/yaml-to-json): Convert YAML to JSON online. Parses nested mappings, sequences, flow collections and typed scalars, and flags tabs, duplicate keys and unsupported features. Run... - [JSON to XML Converter](https://webtoolworld.com/json-to-xml): Convert JSON to XML online. Maps arrays to repeated elements and @keys to attributes, with a configurable root element. Runs entirely in your browser. - [Base64 Decode Online](https://webtoolworld.com/base64decode): Decode Base64-encoded strings back to their original text instantly. Convert any Base64 data to readable plain text or binary content with ease. - [XML to JSON Converter](https://webtoolworld.com/xml-to-json): Convert XML to JSON online. Maps attributes to @keys, repeated elements to arrays, and text to #text, keeping values as strings. Runs entirely in your browser. - [Cron Expression Generator & Analyzer](https://webtoolworld.com/cron): Build a cron expression with guided options, or paste one to get a plain-English explanation, the next run times and warnings about common mistakes. ## Utilities - [QR Code Generator](https://webtoolworld.com/qr-code-generator): Create HD QR codes for links, Wi-Fi, contact cards, email, SMS and more. Add a logo, then download print-ready vector PDF and SVG, or PNG up to 8192 px. Everyth... - [Password Generator](https://webtoolworld.com/password-generator): Generate strong, secure passwords with customizable length and character options. Create PIN codes, pronounceable passwords, and bulk generate up to 50 password... - [New Lines to Comma Separator](https://webtoolworld.com/new-lines-comma-separator): Convert multi-line text into comma-separated values instantly. Import text files, choose custom delimiters, and copy the result with one click. - [Campaign URL Builder](https://webtoolworld.com/campaign-url-builder): Build custom campaign URLs with UTM parameters for Google Analytics tracking - [Barcode Generator](https://webtoolworld.com/barcode-generator): Generate Code 128, EAN-13, UPC-A, EAN-8, Code 39 and ITF-14 barcodes, sized for real printing. - [Bulk QR Code Generator](https://webtoolworld.com/bulk-qr-code-generator): Paste a list and generate hundreds of QR codes at once, downloaded as a single ZIP. - [Barcode Scanner](https://webtoolworld.com/barcode-scanner): Read EAN, UPC, Code 128, Code 39 and ITF barcodes with your camera or from an image. ## Finance Tools - [EMI Calculator](https://webtoolworld.com/emi-calculator): Calculate your monthly EMI, total interest, and total amount payable with our easy-to-use EMI calculator. Perfect for loans, mortgages, and other financial plan... - [Car Loan Calculator](https://webtoolworld.com/emi-calculator/car-loan): Specialized car loan calculator designed to help you calculate EMI and total cost of ownership for car loans. Includes down payment, fixed vs normal EMI, and co... - [Home Loan Calculator](https://webtoolworld.com/emi-calculator/home-loan): Specialized home loan EMI calculator designed to help you calculate monthly payments and total cost of ownership for home loans. Includes down payment, fixed vs... ## CSS Tools - [Percent to PX Converter](https://webtoolworld.com/percent-to-px): Work out what a percentage font size actually resolves to in pixels, for any parent font size. - [REM to Percent Converter](https://webtoolworld.com/rem-to-percent): Convert rem to percent, with a warning about the difference the two units measure against. - [CSS Unit Converter](https://webtoolworld.com/css-unit-converter): Convert between px, em, rem, points, percent and inches at once — enter one value and see every CSS unit. - [EM to Percent Converter](https://webtoolworld.com/em-to-percent): Convert em to percent — the same measurement written two ways, with the conversion table and the layout caveat. - [EM to Point Converter](https://webtoolworld.com/em-to-point): Convert em to points for print styles, given the font size the em is measured against. - [EM to PX Converter](https://webtoolworld.com/em-to-px): Convert em units to pixels for any parent font size, with a conversion table and sub-pixel rounding notes. - [Inches to Pixels Converter](https://webtoolworld.com/inches-to-pixels): Convert inches to CSS pixels at the fixed 96px-per-inch ratio, with a note on what that means on screen versus paper. - [Percent to EM Converter](https://webtoolworld.com/percent-to-em): Convert a percentage font size to em — a straight divide by 100, with the cases where the two stop matching. - [Percent to Point Converter](https://webtoolworld.com/percent-to-point): Convert a percentage font size into points for print, resolved against the parent font size. - [Percent to REM Converter](https://webtoolworld.com/percent-to-rem): Convert percentage font sizes to rem, with the caveat about what each unit is measured against. - [Point to EM Converter](https://webtoolworld.com/point-to-em): Convert points to em, turning a print or document size into a relative web value. - [Point to Percent Converter](https://webtoolworld.com/point-to-percent): Convert points to a percentage font size, relative to whatever parent size you specify. - [Point to PX Converter](https://webtoolworld.com/point-to-px): Convert points to pixels — the fixed CSS ratio, for turning print or document specs into web styles. - [Point to REM Converter](https://webtoolworld.com/point-to-rem): Convert points to rem — turn a print spec into scalable, root-relative web sizes. - [PX to EM Converter](https://webtoolworld.com/px-to-em): Convert pixels to em units for any parent font size, with a full conversion table and rounding warnings. - [PX to Percent Converter](https://webtoolworld.com/px-to-percent): Convert a pixel font size into the percentage equivalent for any parent size, with the full percentage scale. - [PX to Point Converter](https://webtoolworld.com/px-to-point): Convert pixels to points for print stylesheets — a fixed ratio, with a note on why screen DPI does not enter into it. - [PX to REM Converter](https://webtoolworld.com/px-to-rem): Convert pixels to rem units against any root font size, with a conversion table for 16px and 62.5% setups. - [REM to PX Converter](https://webtoolworld.com/rem-to-px): Convert rem units to pixels against any root font size, and see what happens when a reader enlarges their default. - [REM to Point Converter](https://webtoolworld.com/rem-to-point): Convert rem to points for print styles, based on your root font size. ## Browser Extensions - [JSON Formatter](https://webtoolworld.com/apps/extension/json-formatter): Makes JSON responses easy to read. Automatically formats and syntax-highlights JSON in the browser, with collapsible nodes and one-click raw view. - [QR Code Generator & Scanner](https://webtoolworld.com/apps/extension/qr-generator-scanner): Opens showing a QR code for the page you are on. Customise the colours, download or print it, or scan with your camera — it finds every code on screen and shows... ## Blog - [How to Decode Base64 Without Leaking Your Data](https://webtoolworld.com/blog/decode-base64-safely): Base64 is encoding, not encryption. Here is what that means in practice, and how to inspect an encoded payload without handing it to a stranger’s server. - [How EMI Is Actually Calculated (And Why Your Bank’s Number Differs)](https://webtoolworld.com/blog/how-emi-is-calculated): The reducing-balance formula behind every loan EMI, worked through by hand — plus the three reasons your bank quotes a slightly different figure. ## Optional - [All tools (home)](https://webtoolworld.com/) - [Apps & extensions](https://webtoolworld.com/apps) - [Blog](https://webtoolworld.com/blog) - [Sitemap](https://webtoolworld.com/sitemap.xml)