50+ Useful Browser Tools You Can Use Without Installing Apps

You need to convert 72°F to Celsius, split a dinner bill, or check whether a JSON snippet is valid. Five years ago, each of those jobs might have meant finding, downloading and trusting a small app. Today every one of them takes seconds in a browser tab.

The problem is no longer whether a tool exists online. It's finding a good one quickly, remembering where it was next time, and knowing which ones are safe to use. That is what this page is for.

Below is a reference catalog of 73 useful browser tools in 10 categories, from calculators and converters to developer utilities and wellness helpers. Each table tells you what the tool does and where to try it. If you want deeper reviews of the top picks, our guide to the best browser productivity tools covers ten categories in detail; this article is about breadth.

How to use this list of free online tools

Every tool here runs in a normal browser tab with no download. The "Try it" column links to a free standalone tool page on CentPage where one exists. For tool types CentPage doesn't offer, such as PDF merging or regex testing, we describe what to look for and mark it as "Any reputable web tool."

A few conventions before you dive in:

• Bookmark the category, not every tool. You'll use two or three tools per category regularly; the rest are there when you need them.
• Tool pages work on their own. You don't need an account to open a /tool page, though signing in lets you keep your data across devices.
• Some links are companion extensions. A few developer and research tools need deeper page access than a web page can offer, so they are small browser extensions from the same team rather than websites.

Productivity and planning tools in your browser

These are the tools most people open daily: somewhere to jot a thought, track tasks and protect focus time.

Pro tip: A Pomodoro timer plus a to-do list covers most of what paid focus apps do. Pick your top three tasks, start a 25-minute timer, and only check off items when the timer rings.

Online calculators for money, dates and everyday math

A general calculator handles arithmetic; specialized calculators save you from building a spreadsheet for common questions.

Online converters: units, currency, time and files

Converters are the classic "I need this once a month" tool, which is exactly why installing an app for them makes little sense.

Finance and money tools you can use online

Personal finance tools benefit most from living in the browser: you check them often, from different devices, for a few seconds at a time. For a wider set of finance sites, the CentPage finance category collects banking, markets and budgeting links in one table.

Try it: Every tool linked above also works as a widget on your own dashboard, so the ones you use daily sit on your new tab page. Open CentPage in your browser to try it, or add the CentPage extension for Chrome or Firefox.

Developer utilities online: formatters, testers and page inspectors

Developers juggle dozens of tiny utilities. Most are pure input-output transformations that work perfectly in a browser tab. Page-level work like inspecting or auditing a live site needs an extension, because a normal web page can't reach into other sites.

WebDeveloperTools.dev is a companion Chrome extension from the same team as CentPage. It bundles 500+ web development tools for inspecting, outlining, editing and auditing any page, which replaces a long list of single-purpose dev bookmarks.

Pro tip: For JSON, regex and encoding tools, prefer ones that state they run entirely in your browser. You'll often paste real API responses, and those can contain tokens or customer data.

Text and writing tools online

Writers, students and anyone who sends email benefit from a small set of text utilities.

Learning and reference tools for curious minds

Small daily learning tools are easy wins: a minute here and there adds up. The CentPage learn category lists popular course and reference sites if you want to go deeper.

Two of these are companion extensions from the same team. SummaryTube adds AI summaries directly on YouTube, handy when a 40-minute tutorial has three minutes you need. Web Archive Viewer opens historical snapshots of a page, which helps when a reference link you saved has disappeared.

Health and wellness tools in your browser

If you sit at a screen all day, a few lightweight health tools pay off quickly.

Everyday online utilities worth bookmarking

These are the "where was that site again?" tools: weather, QR codes, passwords, file fixes.

Media, news and entertainment tools online

Finally, tools for catching up and winding down, without a separate app for each feed.

That's 73 tools across 10 categories. You can browse even more curated utility sites in the CentPage tools category.

Why use browser tools instead of installing single-purpose apps?

Installing an app for every small job made sense when browsers were slow. Today, the trade-off usually favors the web:

1. Nothing to install or approve. Useful on work laptops, school computers and shared machines where you can't install software.
2. Works on every device. The same tool opens on your laptop, a colleague's PC or your phone.
3. Always up to date. You get the latest version every time you load the page, with no update prompts.
4. Less clutter. No background processes, startup items or forgotten apps eating disk space and RAM.
5. Easy to switch. If a tool disappoints, you close the tab. No uninstall, no leftover files.

Installed software still wins for heavy, offline or professional work: large video projects, complex design files, or anything you need on a plane. For the quick jobs in this list, a browser tab is the lighter option.

Are online tools safe? A quick safety checklist

Free online tools are convenient, but anything you paste into a web page is data you're handing over. Use these rules of thumb:

• Never paste secrets. Passwords, API keys, private keys, bank details and ID numbers don't belong in random web tools.
• Prefer client-side tools. Many formatters and converters say they process data in your browser and never upload it. For sensitive text, choose those.
• Check the domain. Look for HTTPS and the exact spelling of the site name. Lookalike domains are a common trick.
• Be careful with file uploads. For private PDFs or photos, use a tool you trust or an offline alternative.
• Watch what extensions can access. Before installing an extension, read the permissions it requests and install only what you'll actually use.
• Avoid "download our app" detours. If a web tool pushes you to install an unknown executable to finish the job, close the tab.

Why keep your online tools in one place instead of 30 bookmarks

A catalog like this has a catch: if you bookmark 30 tools, you've just created a new problem. Bookmark folders become a maze, you forget what you saved, and you end up searching for "unit converter" again anyway.

The fix is to separate tools by how often you use them:

• Daily tools (notes, tasks, calculator, weather, timer) should be visible the moment you open a browser, as widgets on your start page.
• Weekly tools (currency converter, expense tracker, QR generator) belong one click away, in a named link table or as secondary widgets.
• Occasional tools (PDF merger, regex tester, BMI calculator) can live in this article or a single "Utilities" bookmark.

This is where a dashboard earns its keep. On CentPage, the widgets behind most of the /tool pages above can sit on your homepage, next to your own link tables and a multi-engine search bar, so your new tab becomes a toolbox instead of a blank page. Our walkthrough on building a productivity dashboard shows example layouts for professionals, developers and students.

If you're still deciding where that dashboard should live, the start page setup guide explains homepages, new tabs and speed dials in each browser. And to avoid turning your dashboard into a new kind of clutter, our roundup of which new-tab widgets are actually worth it helps you pick a sensible handful.

Build your own browser toolbox

You don't need 73 tools. You need the eight or ten you reach for every week, somewhere you can't lose them. Pick them from the tables above, try each tool page once, and keep the ones that stick.

When you're ready to put them all on one screen, open CentPage and add your favorites as widgets, or read our full CentPage overview to see how search, bookmarks and widgets fit together on your new tab.