Free tools that never leave your browser.

JSON Formatter & Validator

Pretty-print JSON and catch syntax errors instantly.

Base64 Encoder / Decoder

Convert text to and from Base64, free — encode or decode instantly.

URL Encoder / Decoder

Percent-encode or decode URLs and query strings.

JWT Decoder

Inspect the header and payload of any JWT.

UUID Generator

Generate RFC 4122 v4 UUIDs, one or in bulk.

Unix Timestamp Converter

Convert between epoch time and human-readable dates.

Regex Tester

Test a regular expression against sample text and see every match.

Text Diff Checker

Compare two blocks of text and see what changed, line by line.

Network See all 15 →

CIDR to IP Range Calculator

Free CIDR calculator — convert CIDR notation into its network address, broadcast address, and usable IP range.

Subnet Mask Calculator

Convert between a CIDR prefix and a dotted-decimal subnet mask, either direction.

IP Address to Binary Converter

Convert an IPv4 address between dotted-decimal and binary notation, either direction.

What Is My IP Address

Free tool to show your current public IP address, whether it’s IPv4 or IPv6, and its approximate location.

MAC Address Formatter

Clean up and reformat a MAC address into colon, hyphen, or dot notation.

IP Location Lookup

Free IP address lookup — enter any IP and see its approximate location, instantly.

DNS Lookup

Free DNS lookup — check A, AAAA, MX, TXT, NS, CNAME, or SOA records for any domain, instantly.

Reverse DNS Lookup

Find the hostname associated with an IP address — a PTR record (reverse DNS) lookup.

Text See all 9 →

Word & Character Counter

Live word, character, sentence, and reading-time counts.

Slug Generator

Turn a title into a clean, URL-safe slug.

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences, or words.

Markdown to HTML Converter

Convert Markdown into HTML with a live preview.

Case Converter

Convert text between UPPER, lower, Title, camelCase, and more.

List Randomizer

Shuffle a list into random order, or pick random items from it.

Whitespace Remover

Strip extra spaces, tabs, and blank lines from text.

Reverse Text Generator

Reverse text character-by-character, word-by-word, or line-by-line.

Color & CSS

HEX / RGB / HSL Color Converter

Convert a color between HEX, RGB, and HSL.

CSS Gradient Generator

Build a linear or radial gradient and copy the CSS.

CSS Box-Shadow Generator

Build a box-shadow visually and copy the CSS.

Color Palette Generator

Generate complementary, analogous, and triadic palettes from a base color.

Time & Scheduling See all 9 →

Timer

Set a duration and get an alarm when it ends.

Stopwatch

Track elapsed time with lap tracking.

Countdown to Date/Time

Count down to any date and time, or a common preset.

Timezone Meeting Planner

Compare local time across multiple cities at once, free — find a meeting time that works for everyone.

Date Calculator

Find a date X days from today, or the Nth weekday of a month — free and instant.

Week Number Calculator

Find the ISO week number for any date — free and instant.

Leap Year Checker

Check if a year is a leap year, and see the next and previous ones — free and instant.

Days in a Month Calculator

Find how many days are in any month of any year — free and instant.

QR & Barcode

QR Code Generator

Generate a QR code for a website, WhatsApp, Wi-Fi, a contact card, and more.

Barcode Scanner & Lookup — Book (ISBN)

Scan a barcode with your camera (or type it in) and look up what it identifies — books first, more types coming.

Barcode Generator (Sticky Label Sheets)

Generate sequential or pasted-in barcodes and lay them out on a standard A4 sticky label sheet, ready to print and stick on books or products.

QR Code Scanner

Scan a QR code with your camera or an uploaded image — free, works entirely in your browser.

Barcode Scanner

Scan a retail or product barcode with your camera or an uploaded image — free, works entirely in your browser.

Business & GST See all 14 →

GST Invoice Generator

Create a GST-compliant invoice with CGST/SGST or IGST calculated automatically.

Quotation / Estimate Generator

Create a clean price quotation or estimate for a customer, ready to print.

Receipt Maker

Generate a simple payment receipt with the amount spelled out in words.

GSTIN Validator

Check a GSTIN’s structure and checksum, and see which state it belongs to.

GST Rate Slabs Reference

The current GST slab structure in India, effective 22 September 2025.

TDS Calculator

Estimate TDS deduction for common payment types — contractor, professional fees, rent, and more.

Discount & Markup Calculator

Calculate a discounted price, or a markup on cost, either direction.

Break-Even Calculator

Find the sales volume where your revenue exactly covers your costs.

Image See all 10 →

Image Compressor

Shrink a JPEG or WebP file size with an adjustable quality slider, or hit an exact KB target.

Image Resizer

Resize an image to exact dimensions, with optional aspect-ratio lock.

Image Cropper

Drag to select a region and crop an image to it.

Image Format Converter

Convert an image between JPG, PNG, and WebP.

Favicon Generator

Generate favicon and app-icon PNGs at every standard size from one image.

Watermark Adder

Add a text watermark to an image — position, size, opacity, and color, all adjustable.

Passport / ID Photo Resizer

Crop and resize a photo to standard passport and ID photo dimensions.

Image to PDF

Turn one or more images into a printable PDF using your browser’s print function.

PDF

Merge PDF

Combine multiple PDFs into a single file, in the order you choose.

Split PDF

Split a PDF into multiple files by page range.

Extract PDF Pages

Pull specific pages out of a PDF into a single new file.

Rotate PDF

Rotate every page of a PDF by 90, 180, or 270 degrees.

Compress PDF

Shrink a PDF’s file size by optimizing its internal structure.

PDF Page Numbers & Watermark

Add page numbers and/or a text watermark to every page of a PDF.

Crop PDF

Crop every page of a PDF to a smaller visible area, free — no upload, runs in your browser.

Reorder PDF Pages

Rearrange the pages of a PDF into a new order, free — no upload, runs in your browser.

SEO & Social See all 14 →

Meta Tag Generator

Generate the core SEO meta tags for a page’s <head>.

robots.txt Generator

Build a robots.txt file with allow/disallow rules and a sitemap reference.

Open Graph Preview

Preview how a link will look when shared, and generate the Open Graph tags.

Hashtag Generator

Get hashtag ideas from a topic — a brainstorming starting point, not trend data.

Keyword Density Checker

See which words and phrases appear most often in a block of text.

Read Time Estimator

Estimate reading time for an article, with an adjustable reading speed.

XML Sitemap Validator

Paste sitemap XML to check it’s well-formed and follows the sitemap protocol.

YouTube Thumbnail Downloader

Get every available thumbnail resolution for a YouTube video.

Games & Parties See all 9 →

Tambola Number Caller

Draw random Tambola/Housie numbers 1-90 with traditional call-out phrases and a running history.

Tambola Ticket Generator

Generate printable Tambola/Housie tickets as a PDF, fitting as many as possible per A4 page.

Coin Flip

Flip a virtual coin — heads or tails, with a running tally.

Dice Roller

Roll one or more dice — d4, d6, d8, d10, d12, or d20 — with a running total.

Spin the Wheel

Enter a list of options and spin an animated wheel to pick one at random.

Random Team Shuffler

Split a list of names into randomly balanced teams.

Raffle / Prize Picker

Draw one or more random winners from a list of entries, without repeats.

Tournament Bracket Builder

Generate a single-elimination bracket, a round-robin schedule, or a group stage + knockout tournament from a list of participants.

Classroom

CLASSROOM

Random Student Picker

Randomly pick a student from your class list, with a fair no-repeat mode.

CLASSROOM

Certificate Maker

Create a printable certificate of achievement or completion, ready to download as a PDF.

CLASSROOM

Seating Chart Generator

Generate a random seating chart for a class or exam, free — with an option to keep specific people apart.

Personal Finance

Group Expense Splitter

Track shared expenses across a trip, event, or ongoing group, and see exactly who owes whom.

Personal Budget Tracker

Track your own income and categorized spending, month by month — no account, saved only in your browser.

50/30/20 Budget Calculator

Allocate your income across needs, wants, and savings using the 50/30/20 rule — free, with a printable plan.

70/20/10 Budget Calculator

Allocate your income across everyday expenses, savings, and debt/goals using the 70/20/10 rule — free, with a printable plan.

6 Jars Money Management Calculator

Allocate your income across T. Harv Eker’s 6 Jars — free, with a printable plan.

Kakeibo Budgeting Journal

The Japanese Kakeibo mindful budgeting method — log spending by category and reflect monthly, free.

Envelope Budget Planner

The envelope budgeting method — assign a fixed amount per category, log spending, and see when an envelope runs out.

Zero-Based Budget Planner

Give every dollar a job — zero-based budgeting with your own categories, free.

Data Tools

CSV ↔ JSON Converter

Convert between CSV and JSON, either direction.

CSV SQL Query Tool

Load one or more CSV files and query them with real SQL — joins, filters, and aggregates — entirely in your browser.

JSON Query Tool (JSONPath)

Query a JSON file or paste using JSONPath — filters, wildcards, and recursive search — entirely in your browser.

CSV Diff Tool

Compare two CSV exports row by row and column by column — see exactly what was added, removed, or changed.

Mock / Test Data Generator

Generate a configurable CSV of realistic fake data — names, emails, dates, numbers — for testing or trying out other tools.

JSON Diff Tool

Compare two JSON objects and see exactly which fields were added, removed, or changed — free, in your browser.