Free online tools
A growing set of fast, free, privacy-friendly tools that run entirely in your browser — nothing is uploaded and nothing is stored. Search or filter the 58 tools below, or browse the unit converters and developer conversions.
Showing all 58 tools
Developer tools
JSON, encoding, hashing, timestamps and IDs — accurate, in-browser developer utilities.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text instantly — runs entirely in your browser, nothing is uploaded.
DeveloperJSON Formatter & Validator
Format, validate and minify JSON in your browser. Pretty-print with 2/4-space or tab indent, catch errors with the exact line and column, then copy or download — nothing is uploaded.
DeveloperUnix Timestamp Converter
Convert a Unix timestamp (epoch) to a human date and back — seconds or milliseconds, UTC / ISO 8601 / local / relative output, with a live current-epoch clock. Runs in your browser.
DeveloperURL Encode / Decode
Percent-encode or decode URLs and URL components in your browser, with component vs full-URI mode and correct UTF-8 handling — nothing is uploaded.
DeveloperSHA Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text live, using the browser’s native Web Crypto API — accurate, private, nothing uploaded.
DeveloperUUID Generator
Generate RFC-compliant UUIDs — random (v4), time-ordered (v7), time-based (v1) and name-based (v5) — in bulk, with uppercase / no-hyphen / braces options and a UUID inspector. Runs entirely in your browser.
DeveloperJWT Decoder
Decode a JSON Web Token to read its header and payload, see when it expires, and verify the HMAC (HS256/384/512) signature with your secret — entirely in your browser. The token is never uploaded.
DeveloperJSON to TypeScript
Paste any JSON object and instantly get a fully-typed TypeScript interface — or a set of nested interfaces. Handles arrays, nested objects, optional properties, union types and null. Runs entirely in your browser.
DeveloperPassword Generator
Generate strong, cryptographically random passwords with custom length, uppercase, lowercase, numbers and symbols. Entropy-based strength meter. Runs entirely in your browser — nothing is uploaded.
DeveloperMock Data Generator
Generate realistic fake test data — names, emails, addresses, phones, UUIDs, dates and more — as JSON, CSV or SQL INSERT statements. Pick the fields and row count, then copy or download. Runs in your browser; nothing is uploaded and no real people are used.
DeveloperCSS Formatter
Beautify or minify CSS in your browser — pretty-print minified CSS with proper indentation, or strip all whitespace and comments to get the smallest possible output. Nothing is uploaded.
DeveloperRegex Tester
Test and debug regular expressions live with match highlighting, numbered and named capture groups, a replace preview ($1 / $<name>), flag toggles (g, i, m, s, u, y), common-pattern presets and a full cheatsheet. Uses the browser’s native JavaScript RegExp engine — nothing is uploaded.
DeveloperHTML Entity Encoder / Decoder
Encode text to HTML entities or decode HTML entities back to text. Escape the HTML-special characters (& < > " '), convert all non-ASCII to named or numeric (decimal/hex) entities, or decode any named or numeric entity — the full HTML5 table, including emoji. Runs entirely in your browser.
DeveloperJSON Escape / Unescape
Escape text into a JSON-safe string, unescape a JSON string back to plain text, or minify and validate a JSON document — in your browser. Handles \", \\, \n, \t and control characters, with options to wrap in quotes, escape forward slashes and \uXXXX non-ASCII. Nothing is uploaded.
DeveloperCron Expression Generator & Parser
Build a cron expression from dropdowns, or paste any cron schedule to get a plain-English explanation and the next run times — in your browser. Supports ranges, steps, lists, month/weekday names and @daily-style macros. Nothing is uploaded.
Text tools
Count, transform and compare text live as you type — no upload, no sign-up.
Word Counter
Count words, characters (with and without spaces), sentences, paragraphs and reading time live as you type. Includes platform character-limit bars for X, Instagram, LinkedIn and Meta descriptions.
TextCase Converter
Convert text between UPPER CASE, lower case, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE_CASE and more — click any result to copy.
TextText Diff Checker
Compare two texts and instantly see what changed — added lines green, removed lines red, unchanged lines grey. Line-by-line diff using the LCS algorithm, runs in your browser. Nothing is uploaded.
TextNumber to Words Converter
Convert any number to words — Indian (lakh, crore) or International (million, billion) system, plus the cheque-ready “amount in words” for rupees, dollars, euros and pounds, the ordinal form (first, twenty-first) and grouped formatting. Exact big-integer maths, runs entirely in your browser.
TextText Cleaner
Clean up text in one pass — remove duplicate or blank lines, trim and collapse whitespace, strip HTML tags, sort or reverse lines, convert tabs ↔ spaces, add a prefix/suffix and number lines. Live, in your browser — nothing uploaded.
Color & Design tools
Work with colours and design values in the browser.
Color Converter
Convert a colour between HEX, RGB, HSL, HSV and CMYK live — pick a colour or type any value, copy the CSS, and see tints & shades, the nearest named colour and the WCAG contrast. Runs in your browser.
Color & DesignWCAG Contrast Checker
Check the WCAG 2.1 contrast ratio between any two colours instantly. Get AA and AAA pass/fail results for normal text, large text and UI components, with a live text preview. Runs in your browser.
Color & DesignColor Picker
Pick any colour with the HSL canvas picker and get the HEX, RGB, HSL and CSS values instantly. Save colours to a palette, browse your history, and use the eyedropper to sample from your screen. Runs in your browser.
Color & DesignCSS Gradient Generator
Generate linear, radial and conic CSS gradients with a live preview. Add colour stops, adjust positions, choose presets, and copy the ready-to-use CSS (with -webkit- prefix). Runs in your browser.
Color & DesignCSS Box Shadow Generator
Design CSS box-shadows visually with a live preview — set offset, blur, spread, colour and opacity, stack multiple shadow layers, toggle inset, and copy the ready-to-use CSS. Includes Material elevation and neumorphism presets. Runs in your browser.
Color & DesignCSS Text Shadow Generator
Design CSS text-shadows visually with a live preview — set offset, blur, colour and opacity, stack multiple shadow layers, edit the preview text, and copy the ready-to-use CSS. Neon, 3D, long-shadow, outline and letterpress presets. Runs in your browser.
Color & DesignImage Color Picker
Upload an image and pick the exact colour of any pixel — get HEX, RGB and HSL with a zoom loupe, and auto-extract a dominant colour palette you can copy as CSS variables. Runs entirely in your browser, nothing is uploaded.
Color & DesignColor Palette Generator
Generate harmonious colour palettes from any base colour using colour-theory rules — complementary, analogous, triadic, tetradic, split-complementary and monochromatic. Lock colours you like, press space to shuffle the rest, see tints & shades, and export as CSS variables, JSON or a hex list. Runs in your browser.
Generators tools
Generate codes, IDs and values instantly.
QR Code Generator
Generate QR codes for URLs, text, email, phone, Wi-Fi and vCard instantly in your browser. Custom size (128–1024 px), error-correction level, colours. Download as PNG or SVG. Nothing is uploaded.
GeneratorsRandom Number Generator
Generate fair, unbiased random numbers in any range — with optional no-repeats (unique), decimals, sorting and bulk output. Uses your browser’s cryptographic CSPRNG with unbiased rejection sampling. Runs entirely in your browser — nothing is uploaded.
GeneratorsRandom Picker Wheel
Spin a wheel of names to pick a random winner fairly. Add your own entries, spin, and an unbiased cryptographic draw chooses — with optional remove-after-spin for multiple winners, shuffle and a results log. Runs entirely in your browser — nothing is uploaded.
GeneratorsLorem Ipsum Generator
Generate Lorem Ipsum placeholder text — paragraphs, sentences, words or list items — start with the classic “Lorem ipsum dolor sit amet…”, and copy plain text or ready-to-paste HTML. Runs in your browser, nothing uploaded.
Calculators tools
Quick, accurate calculators that run client-side.
EMI Calculator
Calculate your monthly EMI (Equated Monthly Instalment), total interest payable, total payment, and full amortisation schedule for any home loan, car loan, or personal loan. Runs entirely in your browser.
CalculatorsSIP Calculator
Calculate mutual fund SIP returns: invested amount, estimated returns, total value, an optional annual step-up, a year-by-year growth table and a rate comparison. Runs entirely in your browser.
CalculatorsMortgage Calculator
Calculate your monthly mortgage payment, total interest and full amortisation schedule. Enter home price, down payment, rate and term. Runs entirely in your browser.
CalculatorsCompound Interest Calculator
Calculate compound interest with optional monthly contributions. See final amount, total interest, growth chart and year-by-year breakdown. Includes Rule of 72. Runs in your browser.
CalculatorsROI Calculator
Calculate return on investment (ROI %), CAGR (annualized return), net profit and profit multiple. Enter initial investment and final value or ROI%. Runs in your browser.
CalculatorsBMI Calculator
Calculate your Body Mass Index (BMI) from weight and height in metric or imperial units. Colour-coded result bar, BMI category, healthy weight range and ideal weight. Runs in your browser.
CalculatorsTDEE Calculator
Calculate Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR) using the Mifflin-St Jeor formula. Activity-level multipliers and calorie targets for weight loss, maintenance and gain. Runs in your browser.
CalculatorsGPA Calculator
Calculate your GPA on the US 4.0 scale — weighted (Honors / AP-IB) or unweighted — from courses with letter grades and credit hours. Includes a CBSE CGPA-to-percentage converter. Runs in your browser.
CalculatorsPercentage Calculator
Three-in-one percentage calculator: find what X% of a number is, calculate what percentage one number is of another, and compute percentage change. Instant results, runs in your browser.
CalculatorsAge Calculator
Calculate your exact age in years, months and days from date of birth. Shows total days, weeks and hours lived, the day you were born, and your next birthday countdown. Runs in your browser.
CalculatorsTip Calculator
Calculate tip amount, total bill and per-person split instantly. Quick buttons for 10%, 15%, 18%, 20% and 25% tip, or enter a custom percentage. Supports multiple currencies and bill splitting for any group size. Runs in your browser.
CalculatorsDiscount Calculator
Calculate the final sale price after a percentage discount, find the original price before a discount, or discover what percentage off a deal is. Three modes, preset discount chips (5%–70%), reference table, and India shopping context. Runs in your browser.
Image tools
Process images locally — nothing leaves your device.
Image Compressor
Compress and resize JPG, PNG and WebP images in your browser — adjust quality, convert format, and see the exact before/after size and percentage saved before downloading. Nothing is uploaded.
ImageHEIC to JPG Converter
Convert HEIC / HEIF photos from iPhone to JPG or PNG in your browser — drag and drop multiple files, choose quality, and download instantly. No upload, no sign-up.
ImageImage to PDF
Combine one or more JPG, PNG or WebP images into a single PDF in your browser — choose page size (A4, Letter, A3), orientation, margin and image fit. Nothing is uploaded.
ImageCompress Image to Size
Compress a JPG, PNG or WebP image to an exact target file size — 20 KB, 50 KB, 100 KB or any limit you set. Binary-searches the quality (and resizes if needed) to land just under the target. Ideal for exam-form photo and signature uploads. Runs in your browser — nothing is uploaded.
ImageImage Resizer
Resize any JPG, PNG or WebP image to exact pixel dimensions, a percentage, or a longest-side limit — in your browser, nothing uploaded. Quick presets for Indian exam photos (200×200, 140×60, 300×300) and common web sizes (1280×720, 1920×1080). Download in JPEG, PNG or WebP.
ImageCrop Image
Crop a JPG, PNG or WebP image to any aspect ratio, an exact rectangle, or a circle — drag the crop box, lock a ratio (1:1, 16:9, passport 7:9), rotate and flip, then download. Runs in your browser; nothing is uploaded.
ImagePixelate or Blur Image
Pixelate or blur part of a photo — a face, licence plate, address, name or signature — right in your browser. Drag a box over what to hide, pick pixelate or blur and strength, redact several areas, then download. Nothing is uploaded.
ImageImage to Base64
Convert any image (PNG, JPG, GIF, SVG, WebP) to a Base64 data URI in your browser and copy a ready-to-paste HTML <img>, CSS background or Markdown snippet — or decode a Base64 string back into a downloadable image. Nothing is uploaded.
ImageImage Format Converter
Convert images between PNG, JPG and WebP right in your browser — drag in one or many files, pick the output format and quality, and download. Transparency is flattened onto a chosen background for JPG. Nothing is uploaded.
ImageFavicon Generator
Create a favicon from a letter, emoji or your own image — generates a real multi-size favicon.ico plus 16×16, 32×32, apple-touch (180) and Android 192/512 PNGs, with the ready-to-paste HTML <link> snippet. Everything is drawn and packaged in your browser — nothing is uploaded.
SEO & Web tools
Build and preview web metadata in the browser.
Meta Tag Generator
Generate SEO meta tags, Open Graph tags and Twitter Card tags from a form. Live SERP preview with character-count warnings. Copy as HTML snippet — everything runs in your browser.
SEO & WebSERP Snippet Preview
Preview how your page will look in Google search results — title, URL breadcrumb and description snippet with live character-count warnings. Also see a social card preview (OG / Twitter). Nothing is uploaded.
SEO & WebURL Slug Generator
Turn any title or heading into a clean, SEO-friendly URL slug — lowercase, hyphenated, accents transliterated (é → e), punctuation removed and separators collapsed. Batch-convert a whole list at once, choose the separator, optionally drop stop words and cap the length. Runs in your browser — nothing is uploaded.
Converters tools
Convert between common formats right in your browser.
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More on Internet Tool Wizard
Every tool here works offline once loaded: the processing happens locally in your browser, so your text, JSON, hashes and IDs are never sent to a server.