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Password Generator
Generate strong random passwords locally in your browser with configurable length and character sets.
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Free browser-based tools
Useful little tools for annoying little problems.
Fast, straightforward calculators and utilities for work, websites, money, and everyday tasks. No downloads. No clutter.
Calculate it.Fees, taxes, rates, percentages.
Generate it.URLs, records, snippets, structured data.
Clean it up.Text, formatting, developer data.
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Popular tools
Developer
UUID Generator
Generate one or many UUID v4-style identifiers in your browser for development, testing, APIs, and distributed records.
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Unix Timestamp Converter
Convert Unix timestamps into readable dates and convert local date/time values back into Unix time.
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URL Encoder & Decoder
Percent-encode text for use inside URL components or decode percent-encoded values back into readable text.
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Base64 Encoder & Decoder
Encode text as Base64 or decode Base64 back into readable text directly in your browser.
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Discount Calculator
Calculate the final sale price and dollar savings from a percentage discount, then compare discounts on the same price basis.
Open toolBuilt for the task in front of you
Probably Useful is a growing collection of free browser-based calculators, generators, converters, and practical guides. The tools are designed for the small jobs that interrupt real work: calculating a margin, checking Canadian sales tax, formatting JSON, building a tracked URL, creating a redirect, or fixing text that arrived in the wrong format.
Start with the Tools library when you already know what you need to do, or browse the Guides when you want the formula, reasoning, limitations, and examples behind a task. Many tools run directly in your browser, and the basic utilities do not require an account or download.
Learn the why
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Helpful guides
Website Migration Redirect Checklist: How to Move URLs Without Creating a 404 Mess
A practical redirect workflow for redesigns, domain changes, permalink updates, and CMS migrations.
Read guideWhen a Small Browser Tool Is Better Than Installing Another App
A practical framework for deciding when a one-purpose browser utility is enough and when you really need full software.
Read guideJSON vs Base64 vs URL Encoding: What Each Does
Learn why JSON structures data, Base64 represents bytes as text, and URL encoding makes data safe inside URL components.
Read guideNo downloadsTools run directly in your browser.
No account requiredCore tools stay quick and accessible.
Plain languageUseful results without unnecessary jargon.