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Text & writing

Character Counter

A free character counter with a large writing area, instant character, word, line and UTF-8 byte counts, plus local autosave.

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Whitespace & Line Break Cleaner

A free tool for cleaning line breaks, blank lines, spaces, and tabs. Compare the original and processed text side by side, with autosave, copy, and TXT download.

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Full-width & Half-width Converter

A free full-width and half-width converter for letters, numbers, symbols, spaces, and katakana, with side-by-side comparison, autosave, copy, and TXT download.

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Uppercase & Lowercase Converter

A free case converter for uppercase, lowercase, sentence case, title case, and inverted case, with instant conversion, autosave, copy, and TXT download.

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Word Frequency Counter

A free word frequency counter with frequency percentages, Japanese word segmentation, number exclusion, minimum length, and CSV copying.

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Text Difference Checker

A free text difference checker that highlights additions, deletions, and changes. Includes options to ignore spaces, line breaks, or letter case, plus autosave and text swapping.

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Safe Bulk Find & Replace

A free bulk find and replace tool with multiple rules, change previews, per-match exclusions, autosave, copy, and TXT download. All processing stays in your browser.

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Compare Two Lists

Compare two lists to find matches, differences, and all unique items. Choose case, whitespace, and blank-line options, then copy or download results as TXT.

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Invisible Character Detector & Remover

Find invisible Unicode characters and zero-width spaces, see their exact positions and names, then remove or convert only the types you choose. Runs locally in your browser.

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Duplicate Line Remover

A free duplicate line remover with options to ignore case and outer spaces, remove blank lines, sort results, copy, download, and autosave.

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Line & List Sorter

A free line and list sorter with alphabetical, natural numeric, and length sorting, plus trimming, blank-line removal, autosave, copy, and TXT download.

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Line Number Add & Remove

A free tool to add customizable line numbers or remove existing numbering, with start values, zero padding, separators, autosave, copy, and TXT download.

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Prefix & Suffix Each Line

A free tool to add a prefix and suffix to every line, including an {n} sequence placeholder, start number, blank-line skipping, autosave, copy, and TXT download.

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Line Filter & Extractor

A free line filter to keep or exclude matches using contains, starts with, ends with, exact match, or regular expressions, plus autosave, copy, and TXT download.

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Reading Time Calculator

Estimate reading time for English, Japanese, or mixed text with adjustable words-per-minute speed and character counts.

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Calculators & converters

Percentage Calculator

Calculate percentages, proportions, and percentage changes in your browser. Handles decimals, negative values, and invalid input clearly.

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Discount Calculator

Calculate the final price and savings from an original price and discount percentage. Supports 0%, 100%, and decimal prices.

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Split Bill Calculator

Split a bill between people and optionally add a tip. See the amount per person, tip amount, and grand total instantly.

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Fuel Cost Calculator

Estimate trip fuel use and cost with km/L, L/100 km, or US MPG. No fuel-price API or external data is used.

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Electricity Cost Calculator

Estimate appliance energy use in kWh and electricity cost from wattage, daily hours, number of days, and your price per kWh.

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Unit Converter

Convert units for length, weight, temperature, area, volume, and speed, including metric, US customary, and Imperial labels.

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File Size Converter

Convert B, KB, MB, GB, TB, KiB, MiB, GiB, and TiB accurately, with decimal and binary units kept distinct.

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Aspect Ratio Calculator

Calculate an aspect ratio such as 16:9 and find a new width or height while preserving the original proportions.

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Number Base Converter

Convert whole numbers exactly between bases 2 and 36, including binary, octal, decimal, and hexadecimal, using BigInt.

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Date & time

Date & Day Calculator

Calculate days between two dates or find the date a certain number of days before or after another date. Free and easy to use.

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Age Calculator

Calculate your age from your date of birth. Check your age on a specific date and see how many days remain until your next birthday.

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Work Hours Calculator

Calculate net working time from start time, end time, and break duration. Supports overnight shifts and decimal hours.

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Time Duration Calculator

Calculate the difference between two calendar date-and-time values. Time-zone changes and daylight-saving transitions are not included.

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Time Calculator

Add or subtract hours, minutes, and seconds from a time. Shows whether the result falls on the previous or following day.

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Business Days Calculator

Count business days between dates or add and subtract business days, excluding weekends and custom holidays.

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Stopwatch

Measure elapsed time with a browser stopwatch that supports pause, resume, laps, and reset without interval-counting drift.

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Countdown Timer

A timestamp-based countdown timer with hours, minutes, seconds, pause, resume, reset, and an on-screen completion notice.

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Pomodoro Timer

A simple Pomodoro timer with configurable work and break lengths, pause, resume, skip, and completed work-session count.

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Unix Timestamp Converter

Convert Unix timestamps to UTC ISO date-time values and convert ISO values back to seconds or milliseconds.

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Time Zone Converter

Convert local date and time between common IANA time zones using built-in Intl daylight-saving rules and no external API.

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Images & PDF

Pro-ready

Image Compare & Diff

Compare two images with a slider, overlay, or pixel diff. Exact diff requires matching dimensions.

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Image Optimizer & Converter

Optimize and convert JPEG, PNG, and WebP images locally in your browser. Compare appearance and file size, process multiple images, and download them individually or as a ZIP.

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PDF Merge & Split

Merge multiple PDF files or extract selected pages for free. Your PDFs are processed entirely in your browser and are not uploaded.

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Image to PDF

Convert JPG, PNG, and WebP images to PDF directly in your browser. Combine multiple images into one PDF with no upload required.

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Image Cropper

Crop JPEG, PNG, or WebP images with free selection or 1:1, 4:3, 3:2, 16:9, and portrait presets, entirely in your browser.

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Image Metadata Viewer

Inspect filename, file size, dimensions, EXIF camera and lens data, capture date, orientation, and GPS presence locally.

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Image Color Picker & Palette

Pick colors from an image and copy HEX, RGB, HSL, or a palette of CSS variables.

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PDF to Image

Render PDF pages as JPG, PNG, or WebP images and download them individually or as a ZIP.

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PDF Page Organizer

Preview, reorder, rotate, and remove pages, then save a new PDF.

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Image Metadata Remover

Save a clean copy without location and other privacy metadata. Your original image stays unchanged.

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Print Size & PPI Calculator

Calculate an image’s PPI at a chosen print size, or find the pixels needed for a target PPI.

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Contact Sheet Maker

Arrange images in a contact sheet and export multiple pages as PNG, JPG, or PDF.

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Data & web

URL Encoder & Decoder

A free URL encoder and decoder for full URLs or components, with optional plus-space handling and autosave.

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Base64 Encoder & Decoder

A free Unicode-safe Base64 encoder and decoder with URL-safe output and optional line wrapping.

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JSON Formatter & Validator

A free JSON formatter and validator with 2-space or 4-space indentation, minification, recursive key sorting, clear errors, autosave, and copying.

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HTML Entity Encoder & Decoder

A free HTML entity encoder and decoder with optional quote and non-ASCII encoding.

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URL Slug Generator

A free URL slug generator with lowercase conversion, accent removal, Unicode preservation, separator choice, maximum length, autosave, and copying.

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URL Cleaner

Remove utm parameters, fbclid, gclid, and common email tracking parameters while preserving ordinary URL queries.

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CSV Viewer & Formatter

Parse CSV or TSV with quoted commas, escaped quotes, and multiline fields, preview it as a table, and export normalized CSV locally.

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Color Converter

Convert HEX, RGB, HSL, and alpha color values with a live preview, entirely in your browser.

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Contrast Checker

Calculate the WCAG 2.x contrast ratio for foreground and background colors and check AA and AAA text thresholds.

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Safe QR Code Generator

Create static QR codes for URLs, text, Wi-Fi, email, and phone numbers. Review the exact content first, then save as PNG or SVG—no signup and no built-in expiry.

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QR Code Reader

Read QR codes from uploaded images or a supported camera with local browser processing and no external decoding API.

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Random & handy

Secure Password Generator

Generate a strong random password for free. Choose password length, uppercase, lowercase, numbers and symbols. Runs entirely in your browser.

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Roulette & Random Picker

Enter names or options and pick one at random for free. Use this simple roulette for speaking order, chores, meals, destinations, and more. No sign-up required.

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Random Number Generator

Generate random integers within a range, with or without duplicates, using crypto.getRandomValues and rejection sampling.

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Dice Roller

Roll up to 100 dice using d4, d6, d8, d10, d12, d20, or d100, with individual rolls, totals, and history.

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Team Generator

Enter one participant per line and create balanced random teams by number of teams or members per team.

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List Shuffler

Shuffle a list with crypto-based randomness while preserving every item and duplicate, then copy the full result.

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