With 484 tools, performance was a top engineering priority from day one. Here's how it stays fast:

The Tech Stack:

• React 19 latest React with performance improvements

• TypeScript 5.9 type safety across the entire codebase

• Vite 7 blazing fast build pipeline and hot module replacement

• Capacitor 8 native Android packaging

• Zustand lightweight state management (51 stores, all optimized)

• 201 automated tests keeping everything stable

Why It Stays Fast:

Great question and the fact that you're here on Product Hunt discovering it is part of the answer! Here's the discoverability strategy:

• 507 static SEO pages every tool has its own dedicated page optimized for search engines

• Direct Google discovery search for something like "JSON formatter online" or "base64 decoder" and ZTools pages are designed to appear

• In-app smart search once you're on ZTools, type any keyword and relevant tools surface instantly

• 17 category pages browse by category if you prefer exploring

• Product Finder community-driven tool discovery and recommendations

• Sitemap & RSS Feed proper web infrastructure for crawlers and content aggregators

The strategy is simple: if someone Googles any utility tool, ZTools should be one of the results. With 507 SEO-optimized pages, each tool has its own front door on the internet.

"You might not know ZTools yet. But next time you Google a tool, you might land on it."

Straight answer: ZTools is free to use, and most tools require no account at all. Here's the full picture:

• Free access to all 484 tools

• No account required for most functionality

• No ads cluttering your workspace

• No data selling your data isn't the product

• Optional Google sign-in only if you want favorites sync, collections, and cloud features

• Fair-use controls reasonable usage limits for guest users to prevent automated abuse

The fair-use system exists to keep the platform healthy. It reduced abuse by ~85% while keeping genuine users completely unaffected. If you sign in, you get expanded access and sync features.

There's no "gotcha" paywall behind tool #20. All 484 tools are available.

Yes ZTools has PWA (Progressive Web App) support, which means:

• Install it like an app add to your home screen or desktop from the browser

• Offline-capable many tools work without internet once the app is loaded

• Fast loading cached resources mean near-instant startup after first visit

• No app store needed install directly from the web on any device

• Auto-updates when you're back online, the app syncs to the latest version

Since most tools run entirely on client-side JavaScript, they don't need a server connection to process your data. That means tools like text formatters, calculators, encoders, and generators work perfectly even when your WiFi is being unreliable.

For the Android app, it's even better it's a native-wrapped Capacitor app with full offline tool access.

Yes! Product Finder is one of my favorite features because it turns ZTools from just a toolbox into a community-driven discovery platform:

• Product Finder discover tools and utilities submitted by the community

• Voting upvote tools you find useful, helping others discover the best ones

• Comments share feedback, tips, and use-case ideas on tools

• Admin Approval submissions go through review to maintain quality

• Discovery find new tools you didn't know you needed

It's like a mini Product Hunt... inside a Product Hunt product!

The idea is that 484 tools is just the starting point. The community helps surface which tools matter most and suggests what should be added next.

ZTools takes themes seriously it's not just light/dark mode!

Here's what you can customize:

• Light & Dark Mode the basics, done well

• Color Customization adjust primary colors, accent colors, and UI tones to your preference

• Extensive UI Settings control more than just the color scheme

• Persistent your theme saves and loads every time you open ZTools

• Synced sign in with Google and your theme preferences follow you across devices

I believe tools should feel like your tools. If you spend time in ZTools every day, it should look the way you want it to look.

100% yes! Developers are a big part of the audience, but ZTools was built for everyone:

For Students:

• GPA Calculator track and calculate academic performance

• Math & Science Calculators unit conversions, percentages, equation tools

• Text Tools word counters, character counters, text case converters

• Study Aids reference tables, conversion charts

For Writers & Content Creators:

Fair question there are other tool sites out there. Here's what makes ZTools different:

The biggest differentiators are:

1. Scale 484 tools is significantly more than most alternatives

2. Privacy truly client-side, not "we promise we don't store it"

3. Multi-platform web + Android + extension, not just a website

4. Product depth favorites, collections, themes, community it's a real product, not just a page of utilities

Fellow developer here this is literally why I built ZTools in the first place!

Here are the developer favorites:

• JSON Formatter/Validator paste messy JSON, get it formatted and validated instantly

• Base64 Encoder/Decoder for API tokens, image encoding, data payloads

• Color Converter HEX RGB HSL conversions for CSS work

• Regex Tester build and test regular expressions with live matching

• Minifier/Beautifier JavaScript, CSS, HTML compress or expand

• UUID Generator generate v4 UUIDs for database seeding and testing

• Hash Generator MD5, SHA-1, SHA-256 for verification workflows

• Diff Checker compare two text blocks side by side

• URL Encoder/Decoder handle query params and encoded URLs

• Lorem Ipsum Generator placeholder content for UI mockups

• Timestamp Converter Unix human-readable date/time

• Unit Converters bytes, pixels, rem/em, and more

The best part? Everything runs in your browser. No API keys being sent to random servers. No "paste your code here and trust us" situations.

Absolutely this is exactly what favorites, collections, and presets are for!

• Favorites one-click star on any tool to add it to your favorites list for quick access

• Collections group related tools together (e.g., "My Dev Tools", "Design Toolkit", "Finance Stuff")

• Presets save specific configurations for tools you use repeatedly

• History recently used tools are tracked so you can jump back quickly

• Cloud Sync sign in with Google and your favorites + collections sync across all your devices

• Smart Search even without favorites, search instantly surfaces what you need

For someone who uses 20 tools regularly, I'd suggest:

1. Star your top 20 as favorites

2. Create 2-3 collections to group them by workflow

3. Sign in once to sync everything

Definitely not just a link! The extension is built as a standalone quick-access companion:

• Instant tool access open the extension popup and use tools directly without navigating to the site

• Search from your toolbar find any of the 484 tools right from the extension icon

• No new tab needed run quick conversions, formatting, or generation without leaving your current page

• Same tool quality uses the same client-side logic as the web app

• Chrome & Firefox built for both browsers with a custom build system

It's designed for the "I need this tool for 10 seconds" moments. You're coding, you need to quickly base64-encode a string pop open ZTools, paste, done, back to work. No context switching.

"The fastest tool is the one that's already in your toolbar."

Great news ZTools is available on Android too!

Here's where you can use ZTools:

• Web App full experience at https://ztools.zaions.com, works on any browser

• Android App available on Google Play Store (search "ZTools" by Zaions)

• Browser Extension Chrome Web Store ("ZTools - Utility Tools") for quick access from any tab

• PWA Support install from the browser for a native-app-like experience

All three surfaces share the same tool library, so you get the full 484 tools whether you're on desktop, mobile, or using the extension. Your favorites and settings sync across devices if you sign in with Google.

This is probably the thing I'm most proud of about ZTools your data never leaves your browser.

Here's the privacy model:

• Client-side processing the vast majority of tools run entirely in your browser using JavaScript

• No server uploads your files, text, code, and data are never sent to any backend

• No data collection on tool usage we don't track what you paste, convert, or generate

• No account required most tools work without signing in at all

• Google sign-in is optional only needed if you want features like favorites sync and collections

• Works offline PWA-capable, so once loaded, many tools work without internet

I built ZTools because I was tired of pasting sensitive JSON payloads and API keys into random websites that "promise" not to store them. With ZTools, there's literally no server to store them on it all processes locally.

Thank you and yes, 484 is not a typo!

Here's how the toolbox is organized across 17 categories:

• Text Tools formatters, case converters, counters, diff checkers, encoding/decoding

• Code Tools JSON formatter, minifiers, beautifiers, regex testers, code cleanup

• Calculators math, finance, percentage, unit converters, date calculators

• Design Tools color pickers, palette generators, gradient builders, CSS helpers

• Data Tools CSV/JSON converters, data generators, table formatters

• Image Tools resizers, compressors, format converters, filters

• Generators lorem ipsum, passwords, UUIDs, QR codes, dummy data

• Finance Tools loan calculators, tax estimators, currency converters

• Conversion Tools units, currencies, time zones, number systems

• Security Tools hash generators, encoders/decoders, encryption helpers

• Education Tools GPA calculators, study aids, reference tools

• Media Tools audio/video helpers, file tools

• Legal Tools document helpers, compliance references

• Productivity Tools timers, planners, workflow helpers

• Web Tools meta tag generators, SEO helpers, URL utilities

• Mobile Tools responsive testers, device previews

• Utility Tools everything else that doesn't fit neatly elsewhere

The smart search makes it easy to find exactly what you need just start typing and the most relevant tools surface instantly. No digging through menus.

Totally valid concern nobody wants an extension that turns their browser into a space heater.

Here's why Video Controls Plus stays light:

• Activates only on video pages the extension doesn't inject anything on tabs without HTML5 video elements

• Minimal background processing no persistent background scripts eating resources when you're not using it

• Manifest V3 architecture built on the modern extension standard that enforces better resource management by design

• Clean memory footprint controls attach to the video element directly, not running heavy scripts on the entire page

• CSS-based filters visual filters use GPU-accelerated CSS, not CPU-heavy canvas manipulation

• 932 automated tests we test not just features but also that things don't break or bloat unexpectedly

In practical terms: with 15+ tabs open, you should see no measurable difference in memory usage compared to not having the extension installed unless a tab actually has a video you're actively controlling.

This means the world coming from an educator thank you!

You've actually identified the exact workflow we designed for:

For watching educational content:

• Speed control blast through familiar material at 3x 4x, slow down to 0.8x for complex derivations

• A-B Loop replay a key explanation or demonstration until it clicks

• Screenshot capture diagrams, equations, key slides at full resolution for your notes

• Keyboard shortcuts navigate your learning without breaking focus

Love that you're thinking about accessibility it's something we care about deeply. Here's a glimpse of what's ahead:

What's live today:

• Full speed control suite (0.1x 16x)

• A-B looping, audio boost, filters, screenshots

• Customizable keyboard shortcuts

• Cloud sync via Google sign-in

• Chrome, Firefox, and Edge support

What's on the horizon:

Really appreciate this question privacy is something we take seriously, not just as a checkbox.

Here's the transparent breakdown:

• No tracking of videos watched we don't know or care what you're watching

• No browsing history collection your site visits are yours alone

• No data sold to third parties ever

• Privacy-first analytics only aggregated, anonymous usage patterns (like "how many users use speed control") to improve the product

• Manifest V3 compliant built on the latest extension standard which itself has stricter privacy boundaries

• Minimal permissions we only request what's needed to interact with HTML5 video elements on the page

• Cloud sync is opt-in only if you choose to sign in with Google; works fully offline otherwise

The extension needs page-level access to detect <video> elements that's the permission you see. But it doesn't read page content, form data, or anything else.

Good news for creators yes, all filters apply in real-time with zero perceptible lag!

Here's why it's smooth:

• CSS/Canvas-based processing filters are applied at the rendering layer, not by re-encoding video

• No buffering interruption the video keeps playing as you adjust filters

• Live adjustment slide brightness up, see the change instantly, fine-tune on the fly

• Lightweight on resources no heavy CPU usage, no frame drops

• What you see is real-time perfect for quick visual checks before downloading content for editing

For creators reviewing their own uploads: