Free tools Windows power users keep installed
One-click scans. No signup required.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
I built a browser-based toolbox for the small jobs that interrupt development: formatting JSON, encoding or decoding Base64, trying a SQL query, and converting time values. The point was to keep those tasks together and make local processing the design goal—especially when the input is a snippet I would rather not send to an unfamiliar processing service.
That goal needs a precise boundary: “in-browser” says where computation happens, not whether a site makes other network requests or provides complete privacy. Without project code or network-behavior evidence, I can’t claim that this particular toolbox sends no data, uses no analytics, or stores nothing. Here’s what local-first tooling can mean, and what it cannot promise on its own.
Why put JSON, Base64, SQL, and time tools together?
These are quick, bounded tasks: inspect a JSON response, decode a value, test a query against sample data, or translate a timestamp. Each can be useful without becoming a full application. Keeping them in one toolbox cuts down on context switching; making the processing local can also avoid handing the input to a remote service for the actual transformation.
Recommended Free Tools
The privacy motivation is practical rather than absolute. A developer may be handling an internal API response, a customer record, or a query against data that should not be pasted into an unknown website. A local-processing design can reduce exposure to a remote processor, but it does not make sensitive data safe in every other respect.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
What “in-browser” does—and doesn’t—tell you
A browser can execute JavaScript locally, including substantial tasks. But the phrase “runs in your browser” describes the execution location, not the entire lifecycle of a page or its data. A website may load code and other assets over the network; it may also make requests for analytics or other services. Whether user input is sent anywhere depends on the implementation.
For this toolbox specifically, the available project details do not establish which scripts or assets it loads, whether it makes requests after the page opens, whether it uses analytics, or how it handles persistence. So “100% in-browser” should be read as the intended processing model—not as verified proof that there are no network requests or that inputs never leave a device.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
- What local processing can help with: avoiding transmission of an input to a remote service for processing, if the operation truly runs locally.
- What it cannot prove by itself: that the page has no other network traffic, that no data is stored, or that the device and browser profile are secure.
- What to verify: the implementation, its network behavior, any third-party assets, analytics, and whether results or inputs are saved.
MDN’s guidance on privacy on the web emphasizes data minimization and responsible handling, while also noting that browser capabilities and timing can contribute to fingerprinting. Local execution is one useful boundary, not a substitute for considering the rest of the environment.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Can SQL run in a browser?
Yes. One example is sql.js, a library that compiles SQLite for use in JavaScript environments, including the browser. Its documentation describes a WebAssembly build that requires loading a separate .wasm asset. This shows that browser SQL is technically practical; it does not establish that this toolbox uses sql.js or any particular database library.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
There is also a persistence trade-off. The sql.js documentation says its virtual database runs in memory and does not persist changes by default. It can export a database as a typed array, but an application must decide whether and how to offer that export. For any browser SQL tool, check whether your work disappears when the page closes, remains in browser storage, or can be exported. The answer is implementation-specific.
Base64 is not encryption
Base64 represents bytes using a text encoding. It can make data easier to move through systems that expect text, but it does not make the content confidential: someone who obtains the encoded value can decode it. Don’t treat Base64 as a way to protect a password, token, or other secret.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Encryption is a different operation, involving cryptographic algorithms and keys. Even when cryptography runs on the client, it is not automatically safe: MDN warns that Web Crypto API primitives are easy to misuse and that sound key management and system design are difficult. Its documentation cautions, “It’s very easy to misuse them, and the pitfalls involved can be very subtle.” See MDN’s Web Crypto API guidance before treating browser cryptography as a security design.
Local code still needs safe input handling
Running code on a user’s device does not excuse unsafe implementation. OWASP’s Developer Guide warns against passing untrusted data directly to eval and recommends proper JSON serialization for user-supplied data. A toolbox should treat pasted content as input to handle carefully, not as code to execute.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Local processing also does not secure the computer itself. SQL for Files makes that limitation explicit in its guidance on private local data analysis in the browser: local work does not replace device security, browser-profile hygiene, file controls, or organizational policies. That is general advice, not an independent audit of this toolbox.
Who this toolbox is for—and what to check first
A local-first toolbox is most useful when you want convenient transformations and want to avoid sending input to a remote processing endpoint. For sensitive work, make the decision based on verified behavior rather than the label alone.
- Inspect the project’s code or documentation to see where each operation runs.
- Check whether opening the page loads third-party scripts or assets, and whether later actions trigger network requests.
- Look for a clear explanation of analytics, storage, clearing behavior, and any export option.
- Use sample or non-sensitive data if those details are unknown.
- Follow your organization’s rules for confidential data; a local tool is not an exception to them.
The aim is a convenient place to handle routine JSON, Base64, SQL, and time tasks while keeping processing local where the implementation supports it. The privacy claim should go no further than the code and observable behavior can establish.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
