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 90 tools below, or browse the unit converters and developer conversions.

Showing all 90 tools

Developer tools

JSON, encoding, hashing, timestamps and IDs — accurate, in-browser developer utilities.

Developer

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text instantly — runs entirely in your browser, nothing is uploaded.

Developer

JSON 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.

Developer

XML Formatter & Beautifier

Beautify, minify and validate XML in your browser. Pretty-print with 2/4-space or tab indent, collapse to a single line, and check whether it is properly formed, with the exact error — comments, CDATA and attributes preserved. Nothing is uploaded.

Developer

Unix 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.

Developer

URL 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.

Developer

SHA Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text live, using your browser’s own built-in security tools — accurate, private, nothing uploaded.

Developer

UUID 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.

Developer

JWT 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.

Developer

JSON 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.

Developer

Password Generator

Generate strong, cryptographically random passwords with custom length, uppercase, lowercase, numbers and symbols. A strength meter shows how hard each one would be to guess. Runs entirely in your browser — nothing is uploaded.

Developer

Mock 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.

Developer

URL Parser

Break any URL into its parts — scheme, host, port, path, query string and fragment — with an editable table of query parameters. Edit or add a parameter and copy the rebuilt, correctly-encoded URL. Runs in your browser; nothing is uploaded.

Developer

CSS Unit Converter

Convert between CSS units — px, rem, em, %, pt, pc, in, cm, mm and Q — all at once. Set your own root and element font-size for accurate rem, em and percentage results. Runs in your browser; nothing is uploaded.

Developer

Chmod Calculator

Calculate Unix/Linux file permissions. Tick read/write/execute for owner, group and other to get the octal chmod number (755) and symbolic string (rwxr-xr-x), or type either to set the boxes. Handles setuid, setgid and the sticky bit. Runs in your browser.

Developer

CIDR / Subnet Calculator

Enter an IPv4 or IPv6 address and CIDR prefix to calculate the network and broadcast address, subnet mask, wildcard mask, usable host range, host count and address type. Exact and instant, runs in your browser — nothing is uploaded.

Developer

DNS Lookup

Enter a domain to see its A, AAAA, CNAME, MX, NS, TXT, SOA and CAA records with TTL, plus DNSSEC status and reverse DNS (PTR) for IPs. Resolved live through Cloudflare (1.1.1.1) over DNS-over-HTTPS — no sign-up, no ad-wall, no limits.

Developer

JSONPath Evaluator & Tester

Query JSON with JSONPath live. Supports $ root, .child, [*] wildcard, .. recursive descent, [n] index, [start:end:step] slices, unions and [?(@.price < 10)] filters — with the matched values and their exact paths. Runs in your browser; nothing is uploaded.

Developer

YAML Formatter & Validator

Format, validate, beautify and minify YAML online, and convert YAML ↔ JSON. Pick 2- or 4-space indent, see the exact parse error on invalid input, and handle multi-document YAML. Runs in your browser — nothing is uploaded.

Developer

CSS 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.

Developer

Regex 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.

Developer

HTML 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.

Developer

JSON 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.

Developer

Cron 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.

Developer

HTML Formatter & Beautifier

Beautify, minify and check HTML in your browser. Pretty-print with 2/4-space or tab indent, collapse to one line, and spot unclosed or mismatched tags with the line number. Comments, doctype and the contents of script, style, pre and textarea are kept exactly as they were. Nothing is uploaded.

Developer

SQL Formatter & Beautifier

Format messy SQL into clean, readable queries in your browser — 2/4-space or tab indent, uppercase or lowercase keywords, and a one-line compact mode. Strings, quoted names and comments are never changed, so the query still does exactly the same thing. Nothing is uploaded.

Developer

WHOIS Lookup

Look up any domain: when it was registered, when it expires, who sells it, its nameservers, DNSSEC and every status code — each one explained in plain English.

Text tools

Count, transform and compare text live as you type — no upload, no sign-up.

Text

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.

Text

Case 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.

Text

Text Diff Checker

Compare two texts and instantly see what changed — added lines green, removed lines red, unchanged lines grey. Compares line by line, right in your browser. Nothing is uploaded.

Text

Number 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.

Text

Text 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 & Design

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 & Design

WCAG 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 & Design

Color 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 & Design

CSS 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 & Design

CSS 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 & Design

CSS 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 & Design

CSS Transform Generator

Build a CSS transform visually with a live preview — drag sliders for translate, rotate, scale and skew plus 3D rotateX/rotateY with perspective, set the transform-origin, try flip / tilt / grow presets, and copy the ready-to-use CSS. Runs in your browser.

Color & Design

Image 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 & Design

Color 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.

Generators

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.

Generators

Random Number Generator

Generate fair, unbiased random numbers in any range — with optional no-repeats (unique), decimals, sorting and bulk output. Uses your browser’s built-in secure random generator, so no number is more likely than another. Runs entirely in your browser — nothing is uploaded.

Generators

Random 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.

Generators

Lorem 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 right in your browser.

Calculators

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.

Calculators

SIP 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.

Calculators

Mortgage 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.

Calculators

Compound 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.

Calculators

Simple Interest Calculator

Calculate simple interest (SI = P × R × T ÷ 100) and the total amount. Enter principal, annual rate and time in years, months or days. Year-by-year table, rate × duration reference and a simple-vs-compound comparison. Runs in your browser.

Calculators

Gratuity Calculator

Work out the gratuity your employer owes you under the Payment of Gratuity Act 1972. Enter your last drawn salary (Basic + DA) and length of service to get the amount, the years credited and the ₹20 lakh ceiling check. Runs in your browser.

Calculators

HRA Exemption Calculator

Work out how much of your House Rent Allowance is tax free. Enter your Basic + DA, HRA received and rent paid to see the exempt and taxable amounts, with all three limits compared side by side. Runs in your browser.

Calculators

GST Calculator

Add GST to a price or work backwards from a GST-inclusive price to the base amount. Rates 0%, 5%, 18% and 40% plus any custom rate, with the CGST/SGST and IGST split. Runs in your browser.

Calculators

Sukanya Samriddhi Yojana Calculator

Work out what a Sukanya Samriddhi account will pay at maturity. Enter your yearly deposit and your daughter’s age to get the maturity amount, the year it is paid, her age then, and the full 21-year table. Shows what depositing in April instead of monthly is worth. Runs in your browser.

Calculators

ROI 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.

Calculators

BMI 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.

Calculators

TDEE 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.

Calculators

GPA 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.

Calculators

Rule of Three Calculator

Solve a proportion in one step: if A gives B, what does C give? Handles both direct proportion (more gives more) and inverse proportion (more gives less), shows the working, and runs entirely in your browser.

Calculators

Percentage 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.

Calculators

Age 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.

Calculators

Date Calculator

Find the exact time between two dates — years, months, days, total days, weeks and business days — or add and subtract years, months, weeks and days from any date. Runs in your browser.

Calculators

Aspect Ratio Calculator

Find the aspect ratio of any width × height (e.g. 1920×1080 → 16:9), or lock a ratio and solve the missing width or height to resize without stretching. Presets for 16:9, 4:3, 21:9, 1:1 and more. Runs in your browser.

Calculators

Tip 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.

Calculators

Discount 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.

Calculators

PSI to GPM Calculator

Convert PSI to GPM the honest way. Pressure alone does not give flow rate — you also need a diameter. Solves the nozzle discharge equation GPM = 29.83 × Cd × d² × √P in both directions, plus Hazen–Williams for pipe runs, with a PSI to GPM chart. Runs in your browser.

Calculators

Pounds and Ounces Calculator

Add or subtract weights in pounds and ounces, with the borrow and carry working shown step by step. Handles more than two weights, tells you which is heavier when the result goes negative, and converts the total to decimal pounds, total ounces, kilograms and grams.

Calculators

Speed of Light Calculator

Work out how long light takes to cross any distance, or how far it travels in a given time — through vacuum, water, glass or fibre-optic cable. Exact value 299,792,458 m/s converted to mph, km/s and mi/s, with light-year and solar-system light-delay figures.

Calculators

Rabbit Color Calculator

Rabbit coat color genetics calculator: set both parents’ alleles at all five loci (A, B, C, D, E) and get every possible kit color with its exact probability, sorted most-likely first, plus the locus that produced each outcome. Runs entirely in your browser.

Image tools

Process images locally — nothing leaves your device.

Image

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.

Image

HEIC 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.

Image

Image 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.

Image

Compress 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. Automatically finds the right quality (and shrinks the picture if needed) to land just under your limit. Ideal for exam-form photo and signature uploads. Runs in your browser — nothing is uploaded.

Image

Image 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.

Image

Crop 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.

Image

Pixelate 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.

Image

Image 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.

Image

Image 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.

Image

Favicon 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.

Image

SVG to PNG Converter

Turn an SVG into a PNG, JPG or WebP image right in your browser. Paste the SVG code or drop the file, pick any size or a 1×/2×/3×/4× preset for sharp screens, keep the background see-through, then download. Nothing is uploaded.

SEO & Web tools

Build and preview web metadata in the browser.

SEO & Web

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 & Web

SERP 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 & Web

URL 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.

Converters

Excel to JSON

Convert XLSX, XLS, ODS and CSV files to JSON in your browser. Pick a sheet, toggle first-row-as-headers, choose array-of-objects or array-of-arrays output, then copy or download the result. Files are never uploaded.

Converters

Number to Million Converter

Convert any number to millions and back — with the same figure shown in thousands, billions, trillions, lakh and crore, spelled out in words, and grouped both the Western and the Indian way. Exact decimal arithmetic, runs entirely in your browser.

Converters

Number to Billion Converter

Convert any number to billions and back — plus thousands, millions, trillions, lakh and crore, the number in words, Western and Indian comma grouping, and a clear answer to whether a source means 10⁹ or 10¹². Exact decimal arithmetic, runs in your browser.

Converters

Quarters to Dollars Converter

Convert quarters to dollars and dollars to quarters instantly. 4 quarters = $1.00 and a standard roll is 40 quarters = $10.00 — the converter also shows full rolls, loose coins and jar weight. All in your browser.

Converters

Nickels to Dollars Calculator

Convert nickels to dollars and dollars to nickels instantly. 20 nickels = $1.00 and a roll is 40 nickels = $2.00. Shows rolls, loose coins and weight — a nickel is exactly 5.000 g. Runs in your browser.

Converters

Coin Converter & Calculator

Count coins to dollars: enter how many pennies, nickels, dimes, quarters, half dollars and dollar coins you have for a running total, a value breakdown, roll counts and total weight. Nothing is uploaded.

Converters

Decimal Feet to Feet and Inches Converter

Convert decimal feet to feet and inches and back again, rounded to the nearest 1/2, 1/4, 1/8, 1/16 or 1/32 inch like a real tape measure. Explains why surveyor and engineering tenths of a foot are not inches.

Converters

Acres, Roods and Perches Converter

Convert acres, roods and perches — the way old English, Welsh and Irish deeds, tithe apportionments and enclosure awards write land areas — into acres, hectares, square metres and square feet, and back again. Explains the customary-acre trap that makes old totals disagree.

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.