Tools That Run in Your Browser
Free, self-built utilities for text, hardware testing, and audio. No installs, no sign-ups, nothing ever leaves your device.
Every tool here was built to solve one specific, everyday problem well, not to upsell a bigger product. Whether you need a quick unit conversion, a way to test a new monitor for dead pixels, or a private place to strip metadata from a photo, you can open the tool and get an answer in seconds, with no account and no waiting on a server.
163 tools across 7 tags, and every one of them is free.
Runs in your browser
Most tools process everything locally. Nothing you type or upload has to leave your device.
Free, no catch
No paid tier, no usage caps, no watermarks on what you export or download.
No sign-up needed
Open any tool and use it right away. An account is optional, only for syncing across devices.
10 languages
The whole site and every tool are fully translated, switchable from the navigation bar.
Featured Tools
Calculators
Angular Velocity Calculator
Convert angular velocity between RPM, rad/s, Hz, and more, or derive it from linear speed and radius.
FreeCalculators
Angle Converter
Convert angles between degrees, radians, gradians, turns, arcminutes, arcseconds, and milliradians with live DMS support.
FreeCalculators
Angel Number Calculator
Discover the numerology meaning of a recurring number or your birth date Life Path Number, right in your browser.
FreeCalculators
ANC Calculator
Calculate Absolute Neutrophil Count (ANC) from CBC values and see the NCI CTCAE neutropenia grade, right in your browser.
FreeImage
Analogous Color Scheme
Generate a harmonious analogous color palette from any base color, right in your browser.
FreeText
Anagram Generator
Find English anagrams and shorter words you can make from any word, right in your browser.
FreeCalculators
Amps To Watts Calculator
Convert between amps and watts for DC, AC single-phase, and AC three-phase circuits.
FreeCalculators
Amortization Calculator
Calculate a loan's monthly payment and full amortization schedule, with extra-payment savings.
FreeCalculators
BMI Category Checker
Check your BMI category from Severe Thinness to Obese Class III, with a healthy weight range for your height.
FreeCalculators
Algebraic Expression Simplifier
Simplify an algebraic expression by combining like terms, with a step-by-step breakdown.
FreeCalculators
Air Conditioner BTU Calculator
Estimate the air conditioning BTU capacity a room needs, with a multi-room whole-home total.
FreeCalculators
Age Calculator
Calculate exact age in years, months, and days, plus fun extras like your age on other planets.
FreeCalculators
Advanced Zodiac Compatibility Analyzer
Analyze the astrological compatibility between two zodiac signs, right in your browser.
FreeText
Adler32 Checksum Calculator
Calculate the Adler-32 checksum of text or a file, right in your browser.
FreeVideo
Adjust Video Speed
Speed up or slow down a video and export it, right in your browser.
FreeVideo
Add Watermark To Video
Add a text or image watermark onto a video and export it, right in your browser.
FreeCalculators
Add To A Date
Add or subtract years, months, weeks, and days from a date, right in your browser.
FreeImage
Remove Background Image (AI)
Automatically cut the background out of a photo using an on-device AI model, right in your browser.
FreeImage
Add Text To Image
Add one or more custom text captions onto an image, right in your browser.
FreeText
Add Text Each Line
Insert the same text into every line, at the start, end, an exact position, or next to a match, right in your browser.
FreeText
Add Prefix And Suffix
Add the same prefix and/or suffix text to every line of a list, right in your browser.
FreeImage
Bulk Batch Adjust HSL Image
Apply the same hue, saturation, and lightness adjustment to many images at once, right in your browser.
FreeImage
Adjust HSL Image
Shift hue, saturation, and lightness on an image with live sliders, right in your browser.
FreeImage
Bulk Batch Adjust Gamma Image
Apply the same gamma correction to many images at once, right in your browser.
Frequently asked questions
›Is WMW really free? What's the catch?
Yes, every tool is completely free with no usage limits, no watermarks, and no hidden paid tier. Most tools run entirely as JavaScript in your browser, so there is no server cost per use to recover, which is what lets us keep everything free.
›Do I need to create an account to use the tools?
No. Every tool works immediately with no sign-up. Creating a free account is optional and only unlocks a few conveniences, like syncing your favorites and recently-used tools across devices instead of storing them in this one browser.
›Is my data safe? Do you upload my files or text anywhere?
Most tools, especially anything working with images, audio, or sensitive text, process everything locally in your browser using standard web APIs and never send your file or input to a server. Any tool that does need a server round-trip says so directly on the page.
›What kinds of tools are available?
Calculators covering everyday math, finance, and health; text tools for counting, converting, and transforming; image editors for cropping, filtering, and adjusting; hardware and display test tools for checking a monitor, keyboard, or webcam; and generators for things like passwords, hashes, and random picks.
›Which languages is the site available in?
The interface and every tool are fully translated into 10 languages. Use the language switcher in the top navigation bar to change it at any time; your choice is remembered for future visits.