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.
Recently Used
View allCalculators
A/B Test Significance Calculator
Check whether an A/B test result is statistically significant, with p-value, z-score, and a confidence interval for the lift.
FreeImage
Image Sharpen & Detail
Sharpen an image, apply edge enhancement, run edge detection, or remove noise, directly in your browser.
FreeImage
Image Tint Effects
Apply Colorize (single-color tint) or Duotone (two-color gradient map) effects to an image with a live preview.
Featured Tools
Image
Adjust Gamma Image
Brighten or darken the midtones of an image with a gamma curve, right in your browser.
FreeImage
Bulk Batch Add Noise Image
Add the same grain or color noise effect to many images at once, right in your browser.
FreeImage
Add Noise Image
Add random grain or color noise to an image, right in your browser.
FreeImage
Add Line To Image
Draw one or more lines onto an uploaded image by dragging or precise coordinates, then download the result at full resolution.
FreeText
Add Line Breaks
Add line breaks after each delimiter, every N characters (word-wrapped or exact), or every N words, with a live line count.
FreeCalculators
Add Business Days To Date
Add or subtract business days from a date, skipping weekends and optional holidays, with a full breakdown of skipped days.
FreeCalculators
Actual Cash Value Calculator
Estimate an item's actual cash value (ACV) for insurance purposes from replacement cost and straight-line depreciation.
FreeCalculators
ACT Score Calculator
Calculate your ACT composite score from your four section scores, or compute your superscore across multiple test attempts.
FreeText
Acronym Generator
Turn a phrase into its acronym instantly, with a letter-by-letter breakdown and an optional minor-word-skipping mode.
FreeCalculators
Acres to Square Miles Converter
Convert between acres and square miles in either direction, live as you type, with a quick-reference table and square meters equivalent.
FreeCalculators
Acres to Perches Converter
Convert between acres and square perches (rods/poles) in either direction, live as you type, with square meters equivalent.
FreeCalculators
Acres to Hectares Converter
Convert between acres and hectares in either direction, live as you type, with a quick-reference table and square meters equivalent.
FreeCalculators
Acreage Calculator
Calculate acreage for rectangular, square, triangular, or circular land, converted to acres, hectares, and square meters/feet/yards.
FreeCalculators
Acid Test Ratio Calculator
Calculate the acid test (quick) ratio from balance sheet totals or individual quick assets, with a healthy/moderate/weak read.
FreeCalculators
Acceleration Calculator
Solve for acceleration, final velocity, initial velocity, or time, with g-force and distance-traveled breakdowns.
FreeCalculators
A/B Test Significance Calculator
Check whether an A/B test result is statistically significant, with p-value, z-score, and a confidence interval for the lift.
FreeCalculators
A/B Test Sample Size Calculator
Find how many visitors per variant your A/B test needs, with support for multiple variants (Bonferroni-corrected) and a test duration estimate.
FreeCalculators
Absolute Value Inequality Solver
Solve |ax + b| compared to c for any of <, ≤, >, or ≥, with step-by-step reasoning and interval notation.
FreeCalculators
Absolute Value Equation Solver
Solve |ax + b| = c step by step, with both cases explained and verified.
FreeCalculators
Absolute Value Calculator
Find the absolute value of a number or arithmetic expression with a step-by-step explanation, or process a whole batch list at once.
FreeCalculators
555 Timer Calculator
Calculate 555 timer astable-mode frequency, period, and duty cycle from R1/R2/C, or solve backward for the resistors needed to hit a target frequency and duty cycle.
FreeCalculators
529 College Savings Calculator
Project 529 education savings growth and see what percentage of a future college cost your savings are on track to cover.
FreeCalculators
401(k) Calculator
Project your 401(k) retirement savings growth with employer match, salary increases, and inflation-adjusted real value.
FreeCalculators
3-Phase Power Calculator
Find real, apparent, and reactive power from voltage, current, and power factor, or solve for current from a known load. Free, private, runs 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.