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DevZone.tools Review: 164 Free Browser-Based Developer Tools That Respect Your Privacy

2026-05-14T20:50:32.811+05:30

DevZone.tools Review: 164 Free Browser-Based Developer Tools That Actually Respect Your Privacy

If you've ever needed to format JSON at 2 AM, compress an image before sending it, decode a JWT, or convert a HEIC photo from your iPhone — you know the drill. You search for a tool, land on some shady site plastered with ads, upload your file to a stranger's server, and pray your data isn't being harvested.

I recently discovered DevZone.tools, and it solves this problem in the simplest way possible: every single tool runs entirely in your browser. No uploads. No accounts. No tracking. Just utilities that work.

Here's an honest look at why this toolkit has earned a permanent spot in my bookmarks bar.

What Is DevZone.tools?

DevZone.tools is a free collection of 164 web-based utilities built for developers, designers, students, finance nerds, and basically anyone who works with files or data. Everything is client-side, meaning your JSON, images, PDFs, and documents never leave your computer.

The categories are surprisingly broad:

Formatting — JSON, XML, YAML, SQL formatters and validators
Generators — UUID, password, QR code, hash, favicon generators
Security — JWT decoder, multi-tenant JWT debugger, hash tools
Calculators — From mortgage and SIP to GPA, BMI, and FIRE retirement
File Converters — PDF, image, audio, ebook, and Office document conversions
Screen Tools — Monitor tests, dead pixel detectors, webcam lights
AI Tools — LLM cost calculator, GPU VRAM estimator, RAG cost calculator
Games — Including a free Vim Adventures clone

That's a lot of ground covered without a single signup form.

The Tools I Actually Use Every Week

I won't pretend I've tested all 164 tools, but here are the ones that genuinely improved my workflow.

1. JSON Formatter & Validator

The JSON Formatter is the cleanest one I've used. It validates, prettifies, and minifies in one click — and gives precise line numbers when something breaks. Pair it with the JSON Schema Generator if you need to draft schemas (it supports drafts 2020-12, 2019-09, 7, 6, and 4, plus exports to TypeScript and Zod).

2. Image Compressor & Converter Suite

The Image Compressor reduces file size without trashing quality, and the format converters (PNG ↔ WebP, AVIF, JPG, HEIC, TIFF) are a lifesaver. The HEIC to JPG converter alone saved me from the usual "iPhone photo won't open on Windows" headache.

3. JWT Decoder

If you do anything with authentication, the JWT Decoder is faster than jwt.io and doesn't ping a server. There's also a Multi-Tenant JWT Debugger that recognizes provider conventions for Clerk, WorkOS, Auth0, Supabase, and Firebase — niche but incredibly handy for B2B SaaS work.

4. LLM & AI Cost Calculators

This is where DevZone genuinely stands out. The LLM Cost Calculator compares token costs across GPT-5, Claude Opus 4.7, Gemini 3, and more. The GPU VRAM Calculator tells you exactly what hardware you need to run Llama, Mistral, Qwen, or DeepSeek at different quantization levels. There's even a RAG Cost Calculator and a Vector Database Cost Calculator. For anyone building with AI, these are gold.

5. PDF Tools

Merge, split, convert PDF to Word, PDF to JPG, JPG to PDF — all in one place. And again: zero uploads. Try doing that on most "free" PDF sites.

6. Financial Calculators

The Mortgage Calculator, SIP Calculator, and the four flavors of FIRE calculators (Retirement, Coast, Lean, and Fat FIRE) use Monte Carlo simulations with thousands of scenarios. That's the kind of thing you'd normally pay a financial planning app for.

7. The Cheatsheets

The Cheatsheet Hub covers Git, CSS, Linux, React, and Vim with searchable, copyable commands. Better than the bookmarks folder I've been neglecting for years.

Why "Browser-Based" Actually Matters

Most "free online tools" sites work like this: you upload your file → it goes to their server → it's processed → you download the result. Somewhere in that pipeline, your data is logged, cached, or scanned.

DevZone.tools flips that. Everything runs in JavaScript locally on your device. That means:

Your data stays on your machine. No NDA-violating uploads, no leaked credentials in pasted JSON, no private photos sitting on someone's S3 bucket.
It's faster. Zero network round-trips. Conversions happen instantly.
It works offline once loaded. Useful on flights or in coffee shops with terrible WiFi.

For anyone working with sensitive corporate data, client files, or personal documents, this architecture isn't a nice-to-have — it's essential.

What I'd Improve

To keep this review honest: a few of the niche tools (like the random animal generator or city name generator) feel more like creative-writing utilities than developer tools. They're well-built, but the site's identity skews more "general utility hub" than strictly "dev tools." Whether that's a feature or a flaw depends on what you need.

Also, with 164 tools, discovery can be overwhelming on a first visit. Thankfully the search bar (⌘K) handles that nicely.

Final Verdict

DevZone.tools is the rare free toolkit that doesn't feel like a trap. No popups, no fake "Pro" tiers, no "sign up to download." Just a clean, fast, privacy-first set of utilities that grows every week.

If you're a developer, designer, student, or just someone who occasionally needs to convert a file or run a calculation, bookmark it now. You'll use it more than you expect.

👉 Check it out here: https://devzone.tools

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Exploring Your Path to Homeownership: A Guide to Loan Options for New Homebuyers in the USA

2023-08-17T00:02:00.001+05:30

There are several loan options available for new homebuyers in the USA. Please note that the availability and terms of these loans can change over time, so it's always a good idea to consult with a mortgage professional or financial advisor for the most up-to-date information. Here are some common loan options:

1. Conventional Loans: These are traditional mortgage loans offered by private lenders and backed by either Fannie Mae or Freddie Mac. They typically require a higher credit score and a down payment of at least 3% to 20% of the home's purchase price.

2. FHA Loans (Federal Housing Administration): These loans are backed by the government and allow for a lower down payment (as low as 3.5%) and more flexible credit requirements. They are suitable for first-time homebuyers who may have limited funds for a down payment.

3. VA Loans (Veterans Affairs): Available to eligible veterans, active-duty service members, and certain members of the National Guard and Reserves, VA loans offer favorable terms, including no down payment and competitive interest rates.

4. USDA Loans: These loans are designed for homebuyers in rural and suburban areas who meet certain income requirements. They offer low to no down payment options and competitive interest rates.

5. Jumbo Loans: If you're buying a high-priced home, a jumbo loan might be necessary. These loans exceed the conforming loan limits set by Fannie Mae and Freddie Mac and often have stricter credit requirements and higher down payment thresholds.

6. Fixed-Rate Mortgages: With fixed-rate mortgages, the interest rate remains constant for the life of the loan (usually 15 to 30 years). This provides stability in monthly payments.

7. Adjustable-Rate Mortgages (ARMs): ARMs have an initial fixed-rate period (e.g., 5, 7, or 10 years), after which the interest rate adjusts periodically based on a specified index. These loans can offer lower initial rates but come with the potential for higher payments in the future.

8. Interest-Only Loans: These loans allow borrowers to pay only the interest for a certain period (usually 5-10 years) before transitioning to principal and interest payments. They can be risky if the property's value doesn't appreciate or if the borrower's financial situation changes.

9. FHA 203(k) Loans: Designed for buyers looking to purchase a home that needs significant renovations, these loans include funds for both the purchase price and renovation costs.

10. HomeReady and Home Possible Loans: These are specialized conventional loans with lower down payment requirements and more flexible credit criteria, aimed at low- to moderate-income borrowers.

Remember that loan availability and terms can vary based on your credit score, income, location, and the lender you choose. It's important to shop around and compare offers from different lenders to find the loan that best fits your financial situation and homebuying goals. Additionally, regulations and loan programs might have changed since my last update, so it's advisable to consult with a mortgage professional to get the latest information.

Navigating the Maze of Home Buying Costs: A Comprehensive Guide to Charges When Purchasing a New Home in the USA

2023-08-16T23:56:00.001+05:30

When buying a new home in the USA, there are several charges and costs associated with the purchase. These costs can vary based on factors such as the location of the home, the price of the property, and the specific terms of the transaction. Here are some common charges you might encounter:

1. Down Payment: This is a percentage of the home's purchase price that you pay upfront. The typical down payment ranges from 3% to 20% of the home's price, depending on the loan type and your financial situation.

2. Closing Costs: These are various fees associated with the closing of the real estate transaction. They can include:

- Origination Fees: Charges by the lender for processing the mortgage.

- Appraisal Fees: The cost of assessing the property's value.

- Title Search and Title Insurance: Costs to ensure the property's title is clear and free from disputes.

- Attorney Fees: Legal fees if an attorney is involved in the transaction.

- Home Inspection Fees: The cost of a professional inspection of the property.

- Recording Fees: Fees for recording the deed and other documents with the local government.

- Escrow Fees: Fees for the escrow service that holds and manages funds during the transaction.

- Homeowners Association (HOA) Fees: If the property is part of an HOA, you might need to pay initiation fees or dues.

3. Private Mortgage Insurance (PMI): If your down payment is less than 20%, you might be required to pay PMI, which protects the lender in case you default on the loan.

4. Homeowners Insurance: This insurance protects your home and its contents from various risks, and lenders often require it.

5. Property Taxes: You'll need to pay property taxes, which vary based on the property's assessed value and the local tax rate.

6. Prepaid Items: These include upfront payments for property taxes, homeowners insurance, and sometimes interest on the loan that accrues between closing and your first mortgage payment.

7. Home Warranty: While not always required, you might choose to purchase a home warranty to cover the cost of repairs to major systems and appliances.

8. Utilities and Service Setup: You'll need to pay for setting up utility services such as electricity, water, gas, internet, and cable.

9. Moving Costs: Expenses related to moving your belongings to your new home.

It's important to note that these charges can add up significantly, so it's advisable to budget for them in addition to the actual purchase price of the home. Your real estate agent, lender, or a financial advisor can help you understand the specific costs associated with your home purchase and guide you through the process.

Essential Home Inspections When Buying a New Home in the USA: A Comprehensive Guide

2023-08-16T23:51:00.000+05:30

When buying a new home in the USA, there are several inspections you should consider having done to ensure that the property is in good condition and meets your expectations. Keep in mind that specific requirements can vary based on location, property type, and individual circumstances. Here are some common inspections to consider:

1. General Home Inspection: This is a comprehensive inspection that covers the overall condition of the home, including its structure, foundation, roof, plumbing, electrical systems, HVAC (heating, ventilation, and air conditioning), appliances, and more. A licensed home inspector will provide a detailed report on any issues or potential concerns.

2. Pest Inspection: Also known as a termite inspection, this checks for any signs of wood-destroying insects such as termites, carpenter ants, and wood-boring beetles. Pest damage can be extensive and expensive to repair, so this inspection is crucial, especially in areas prone to these pests.

3. Radon Inspection: Radon is a radioactive gas that can seep into homes from the ground. Prolonged exposure to high levels of radon can be harmful to health. Radon testing helps determine if mitigation is needed to reduce radon levels.

4. Mold Inspection: While not always included in a standard home inspection, a mold inspection can be important, especially if you suspect mold growth due to water damage or other factors. Mold can lead to health issues and affect indoor air quality.

5. Lead-Based Paint Inspection: For homes built before 1978, it's important to determine if there is lead-based paint present. Lead paint can be hazardous, particularly for young children, and proper disclosure and mitigation may be required.

6. Septic System Inspection: If the property has a septic system, you should have it inspected to ensure it's functioning properly. This may involve checking the tanks, drain fields, and overall system health.

7. Well Water Inspection: If the property has a well for water supply, a water quality test should be conducted to ensure that the water is safe for consumption.

8. Roof Inspection: While the general home inspection covers the roof, you might want a specialized roof inspection to get a more detailed assessment of its condition, especially if the home has an older roof.

9. Pool and Spa Inspection: If the property has a pool or spa, a separate inspection can assess their condition, safety features, and compliance with local regulations.

10. Energy Efficiency Audit: While not always a standard inspection, an energy audit can provide insights into the home's energy efficiency. This might include evaluating insulation, windows, HVAC systems, and more.

Remember that the cost of these inspections can add up, but they can potentially save you from purchasing a home with hidden issues that could become expensive problems later on. It's advisable to work closely with a qualified real estate agent who can guide you through the process and recommend reputable inspection professionals in your area.

Setting Up Your New Home: A Comprehensive Guide to Essential Purchases in the USA

2023-08-16T23:45:00.002+05:30

Setting up a new home in the USA requires careful planning and consideration. Here's a list of essentials you might want to consider purchasing:

1. Furniture:

- Bed and mattress

- Sofa or couch

- Dining table and chairs

- Dressers and wardrobes

- Coffee table and side tables

- Bookshelves or storage units

2. Kitchen Supplies:

- Cookware (pots, pans, baking sheets)

- Utensils (spoons, knives, spatulas)

- Plates, bowls, glasses, and silverware

- Cutting boards

- Small appliances (microwave, toaster, coffee maker, blender)

- Food storage containers

3. Appliances:

- Refrigerator

- Stove/oven

- Washer and dryer (if not already provided)

4. Cleaning Supplies:

- Broom, mop, and vacuum cleaner

- Cleaning agents (all-purpose cleaner, dish soap, laundry detergent)

- Trash cans and trash bags

5. Bedding and Linens:

- Bed sheets, pillows, and pillowcases

- Towels (bath towels, hand towels, washcloths)

- Curtains or blinds for windows

6. Bathroom Essentials:

- Shower curtain

- Toilet brush and plunger

- Soap dispenser and toothbrush holder

7. Basic Tools:

- Screwdrivers, pliers, and wrenches

- Hammer

- Tape measure

- Level

8. Safety and Security:

- Smoke detectors

- Carbon monoxide detector

- Fire extinguisher

9. Personal Care:

- Toiletries (shampoo, soap, toothpaste)

- Toilet paper

10. Electronics:

- Lighting (lamps, light bulbs)

- Power strips

- Charging cables

- Entertainment devices (TV, streaming devices)

11. Outdoor Supplies:

- Lawn care tools (if applicable)

- Gardening tools (if applicable)

- Outdoor furniture (if applicable)

12. Home Décor:

- Rugs

- Wall art and decorations

- Plants

Solar Lights Outdoor 182 LEDs 2500Lm Solar Motion Sensor Lights Solar Panel 15.3 in2 and 3 Modes(Security/Permanent On All Night/Smart Brightness Control) with IP65 Waterproof with Wide Angle(2pack)

2023-08-16T23:38:00.001+05:30

About this item

1.Three Optional Modes

1.security mode(Motion sensor turns the light on and off automatically)

2.Permanent On all night(it turns on at night and stay all night.)

3.Smart brightness control(the Light stays all night and turns brighter when it detects motion)

2.Sensitive PIR Motion Inductor: With upgraded Motion Sensor Detector and Greater PIR sensor can detects people up to 26 feet within angle of 120 agrees. 2200 mah rechargeable lithium-ion battery, brighter and more long-term

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4.High Efficient Solar Panel Our solar Panel is more energy saving and with PET laminated solar panel and premium LED lights, which is up to 20. 5% Conversion Rate with 1. 2W Monocrystalline silicon . it's more durable and suitable for long-term use.

5.Waterproof IP65 and Heatproof Great outdoor security night light for wall, patio, garden, porch, lawn, pathway, gutter, etc. It's specifically designed to withstand extreme weather conditions.

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Essential Shopping Guide for Newborn Baby Girls: Must-Have Items for a Happy and Healthy Start

2023-06-29T11:00:00.002+05:30

When shopping for a newborn baby girl, some essential items to consider include:

Clothing: Look for soft and comfortable onesies, sleepers, bodysuits, socks, hats, and mittens suitable for newborns. Opt for a variety of sizes to accommodate their growth.

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Diapers and Wipes: Stock up on newborn-sized diapers and gentle baby wipes to keep your little one clean and comfortable.

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Bedding and Blankets: Purchase a crib or bassinet with a firm mattress, fitted sheets, and cozy blankets to ensure a safe and comfortable sleep environment.

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Feeding Supplies: If you plan to breastfeed, consider nursing bras, breast pads, and a breast pump. For bottle feeding, get a set of bottles, nipples, sterilizer, and bottle cleaning brush.

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Baby Bath Essentials: Look for mild baby shampoo, body wash, soft washcloths, hooded towels, and a baby bathtub to make bath time enjoyable and safe.

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Infant Car Seat: Ensure the safety of your baby while traveling by investing in a rear-facing infant car seat that meets safety standards.

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Nursing and Burping Supplies: Nursing pillows, burp cloths, and bibs will come in handy during feeding and help keep your baby clean and comfortable.

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Baby Care Products: Stock up on baby-friendly essentials like diaper rash cream, petroleum jelly, baby lotion, baby nail clippers, and a gentle baby brush.

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Baby Carrier or Sling: Consider a baby carrier or sling to keep your little one close while providing comfort and convenience for both of you.

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Baby Monitor: For peace of mind, choose a reliable baby monitor that allows you to keep an eye and ear on your baby from another room.

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Remember, this list is not exhaustive, and the specific needs may vary based on your preferences and lifestyle.

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Liferay Connected Services

2015-06-24T14:51:00.001+05:30

Liferay Connected Services

Liferay Connected Services is a new online platform that offers a set of tools and services that will help our customers succeed on their Liferay projects. read more https://www.liferay.com/products/liferay-connected-services

Liferay 6.1.1 GA2 Application Security

2012-11-05T23:18:00.000+05:30

1. Web server type and version disclosure.
Risk Impact

Being able to determine precise software versions might aid an attacker in mounting tailored attacks on the server.

Recommendation
It is recommended removing software versions in use from service banners.

Solution
Add the below property in portal-ext.properties
##
## HTTP Header Reponse
##

    #
    # Set the level of verbosity to use for the Liferay-Portal field in the HTTP
    # header response. Valid values are "full", which gives all of the version
    # information (e.g. Liferay Portal Community Edition 6.1.0 CE etc.) or
    # "partial", which gives only the name portion (e.g. Liferay Portal
    # Community Edition).
    #
    http.header.version.verbosity=partial

2. Auto complete is enabled

Risk Impact
Not setting ‘AutoComplete’ attribute can allow attackers to extract valid credentials of previously logged-in users from public computers or multi-user environments.

Recommendation
It is recommended to set auto complete functionality to “off” for sensitive input fields.

Solution
Add the below property in portal-ext.properties

    #
    # Set this to true to allow users to autocomplete the login form based on
    # their previously entered values.
    #
    company.security.login.form.autocomplete=false

    #
    # Set this to true to allow users to ask the portal to send them their
    # password.
    #
    company.security.send.password=false

3. Missing HttpOnly Attribute in Session Cookie

Risk Impact
In absence of HTTPOnly attribute in the set-cookie parameter, an attacker can exploit this vulnerability to gain information stored in cookie or can launch theft of modification attack by using malicious.

Recommendation
It is recommended enabling HTTPOnly feature for session cookies.

Solution
Add the below configuration for Tomcat {TOMCAT_HOME}\conf\context.xml file.
<Context useHttpOnly="true">