DEV Community: Ajay Kumar

How to Extract URLs and Emails from Raw HTML Without Leaking Your Code. Universal URL/Links Extractor by FreeClientToolbox: Parse HTML Securely

Ajay Kumar — Tue, 07 Jul 2026 07:09:07 +0000

As developers, we frequently find ourselves staring at a massive block of unstructured text, a raw HTML dump, or a messy API response, needing to extract every single URL or email address buried inside it.
The usual workflow? Google "Link Extractor," click the first result, paste your proprietary data into a random text box, and hit submit.
Here is the problem: You just sent your company's proprietary code, internal endpoints, or client data to an unknown backend server.
I was tired of this security risk and the arbitrary "3 uses per day" limits on free tools. So, I added the Universal Links Extractor to FreeClientToolbox.com.
It is a professional-grade extraction engine built on a strict 100% Client-Side Architecture.

Why is this better than standard extractors?

Most basic extractors just look for href= tags. If your URL is hidden inside a JSON string or a raw text block, they miss it completely. I engineered the extractor at FreeClientToolbox.com to be much smarter.
Here is a deep dive into its advanced features:

🚀 1. Advanced Regex Engine

It doesn't rely on simple HTML parsing. It uses advanced, highly optimized Regular Expressions (Regex) to scan the text block and intelligently identify URLs, IP addresses, and emails, regardless of how messy the surrounding syntax is.

🚀 2. Absolute Data Privacy (Zero Uploads)

Because it leverages modern browser APIs, the entire extraction process happens within your local RAM. You could paste a 10,000-line proprietary configuration file into it, and not a single byte will ever be transmitted to a server.

🚀 3. Smart Deduplication

Extracting 500 links is useless if 450 of them are duplicates. The tool automatically filters out duplicate URLs in real-time, giving you a clean, unique list of endpoints.

🚀 4. Categorization (Internal vs. External)

If you are doing SEO analysis or auditing a website's outgoing links, the tool can instantly separate the extracted URLs into internal links (same domain) and external links, saving you hours of manual sorting.

🚀 5. One-Click Export

Once you have your clean list of URLs, you can instantly export the data to a CSV or TXT file to plug directly into your automated scripts, spreadsheets, or scrapers.

Built by Developers, for Developers

The entire suite at FreeClientToolbox.com is completely free. No sign-ups, no paywalls, and absolutely zero server processing. It just works, instantly.
If you ever need to scrape links from unstructured data securely, give it a try:
👉 Universal Links Extractor - FreeClientToolbox
I'd love to hear your feedback! Are there any specific Regex patterns or extraction rules you'd like me to add to the engine? Let me know in the comments below! 👇

Why You Should Stop Pasting Proprietary Code into Random "Diff Checkers"

Ajay Kumar — Tue, 07 Jul 2026 06:44:34 +0000

How many times have you copied an entire JSON payload, an XML configuration file, or an API response and pasted it into a random online "Diff Checker" to spot a bug?
I see developers do this every day. The problem? You are leaking proprietary company data to unknown backend servers.
A developer friend of mine got tired of this security risk and built TextCompareo. It’s not just a basic diff tool; it’s an advanced comparison engine built on a strict 100% Client-Side Architecture.
Here is why it deserves a bookmark in your dev toolkit:

1. Absolute Privacy (WASM & Local Processing)

Every single byte of data you compare is processed within your local browser memory. Whether it's a 10-line text snippet or a massive raw XML configuration, it never gets uploaded to an external server. It uses the Myers Diff Algorithm directly in your browser.

2. "Smart Parsing" for Structured Data

Comparing raw HTML or XML is a nightmare because of the markup noise. TextCompareo has a built-in Smart Parsing engine that strips away the layout codes and structural tags, allowing you to compare the actual meaningful content side-by-side without getting distracted by formatting changes.

3. Folder & ZIP Diffing

Need to check what files were modified between a backup directory and your current deployment build? You can drag and drop entire folders or ZIP archives. It will instantly reconcile the directories and flag missing, added, or modified files.

4. Natively Handles PDFs, Excel, and Word

It natively parses .xlsx, .docx, and .pdf files locally. It even has a brilliant UI feature where you can drag horizontal guidelines to exclude PDF headers/footers (so page numbers don't show up as "differences").
It is completely free, has zero usage limits, and requires no sign-ups.
If you care about data privacy and need a robust comparison engine for your workflow, give it a spin:
👉 Try TextCompareo Here
Let me know what you guys think of the architecture! What other file formats would you want to see supported?

The 7 Micro-Tools I Use Every Single Day as a Tech Lead Here We have Best Free Password Generator & DNS Lookup Tools 2026 | FreeClientToolbox

Ajay Kumar — Mon, 06 Jul 2026 09:46:50 +0000

Browser bloat is real. We all have that one bookmarks folder filled with 20 different websites for random daily tasks: a site to generate passwords, a site to check DNS, a site to make QR codes.

Most of these sites are slow, riddled with display ads, and frankly, look like they were built in 2005.

I recently cleared out my entire utilities folder and replaced it with a single bookmark: FreeClientToolbox.

The Ultimate Unified Toolkit

FreeClientToolbox is a beautifully designed, modern platform housing over 200+ tools. The UX is incredibly polished (think smooth animations and a clean dark mode), but more importantly, the entire site is built on a 100% Client-Side Architecture. It loads instantly, and your data is never tracked.

Here are the 7 utilities I find myself using almost every day:

1. Security & Access

Password Generator
- Advanced Feature: Granular control over character sets (symbols, numbers, uppercase) with a strict client-side guarantee. The password is generated in your browser memory and disappears the second you copy it.
SSL Certificate Checker
- Advanced Feature: Provides deep diagnostics on SSL chains, expiration dates, and issuer details without needing to use terminal commands.

2. Network Diagnostics

DNS Lookup & WHOIS Lookup
- Advanced Feature: Instantly fetches A, AAAA, MX, and TXT records. Perfect for verifying if a domain transfer has actually propagated.
Internet Speed Test
- Advanced Feature: A clean, ad-free speed test that gives you accurate ping, latency, and bandwidth metrics without draining your CPU rendering ads.

3. Media & Sharing

QR Code Generator
- Advanced Feature: Generates high-res, SVG/PNG exportable QR codes that never expire. (A lot of "free" generators sneakily redirect through their tracking servers—this one generates pure, raw URLs).
YouTube Thumbnail Downloader
- Advanced Feature: Automatically fetches the absolute highest resolution (MaxRes) thumbnail available via the YouTube API.

If you value a clean, fast, and secure workflow, check out the FreeClientToolbox Homepage. It's the Swiss Army knife every web professional needs.

Best Free PDF Compressor & PDF Merger in 2026 (No Limits) | FreeClientToolbox

Ajay Kumar — Mon, 06 Jul 2026 09:41:35 +0000

Let’s talk about a major cybersecurity blind spot: PDF tools.

Every day, millions of people Google "Merge PDF" or "Compress PDF" and upload their bank statements, medical records, and signed NDAs to random servers hosted overseas. You have zero guarantees that your files are actually deleted after processing.

We need to stop doing this.

I want to highlight FreeClientToolbox. They have engineered a complete PDF manipulation suite that operates under a strict 100% Client-Side Policy.

How It Works (And Why It's Safe)

When you use their PDF tools, the website loads a JavaScript PDF library into your browser. When you select a file, your browser parses the PDF locally in your device's memory, performs the merge/compression, and generates the new file directly to your downloads folder. Your sensitive documents literally never leave your computer.

Plus, there are no "PRO" upgrades, no watermarks, and no daily limits. It’s truly free.

Here are the 7 essential tools in their PDF suite:

1. Organization & Security

PDF Merger & PDF Splitter
- Advanced Feature: Visual drag-and-drop interface allowing you to reorder pages before merging, or select specific page ranges to extract.
PDF Password Protector
- Advanced Feature: Applies strong AES-256 encryption locally. If you need to email a sensitive document, encrypt it here first.

2. Size & Format

PDF Compressor
- Advanced Feature: Adjusts DPI and image quality within the PDF to shrink file sizes massively, ensuring it passes strict email attachment limits.
PDF to JPG & JPG to PDF
- Advanced Feature: High-fidelity rasterization that prevents font-kerning issues during conversion.

3. Data Extraction

PDF to Text Extractor
- Advanced Feature: Strips out all vectors and images to provide clean, copy-pasteable text, even from heavily formatted brochures.

Protect your data. Stop using server-based PDF tools and switch to the FreeClientToolbox PDF Suite.

Heavy Image Processing Directly in the Browser (No APIs Required) Here is Best Free Image Compressor & Background Remover in 2026 | FreeClientToolbox

Ajay Kumar — Mon, 06 Jul 2026 09:39:32 +0000

If you've been doing frontend development for a while, you know the pain of asset management. You need to convert a folder of PNGs to WebP for better Lighthouse scores, or you need to remove the background from a headshot.

Historically, this meant opening Photoshop (slow) or uploading your images to a sketchy website that limits you to "3 free conversions per day" and ruins the image with a watermark.

Thanks to modern WebAssembly (Wasm) and the Canvas API, we don't need backend servers for this anymore.

I highly recommend bookmarking FreeClientToolbox. It’s a suite of 200+ tools that run entirely in your browser.

The Security & Speed Advantage

Because there are no server uploads, the processing is instantaneous. More importantly, your images remain completely private. If you are working with unreleased product photos or sensitive documents, a 100% client-side tool is mandatory.

Here are the 10 image utilities I rely on:

1. Heavy Manipulation (AI Powered)

Background Remover
- Advanced Feature: Runs a lightweight machine learning model directly in the browser to isolate subjects with incredible edge precision.
OCR (Optical Character Recognition)
- Advanced Feature: Supports multiple languages and extracts text from screenshots locally without pinging a cloud API.

2. Optimization & Conversion

Image Compressor
- Advanced Feature: Offers a granular quality slider with a real-time side-by-side comparison of the original vs. compressed image.
Universal Image Converter (Handles almost any format natively).
WebP Workflow: PNG to WebP, PNG to JPG, and JPG to PNG.

3. Niche Fixes

HEIC to JPG
- Advanced Feature: Safely converts Apple's proprietary HEIC format into standard JPEGs natively in the browser.
SVG Converter (Turn vector math into rasterized PNG fallbacks).
Favicon Generator (Generates standard .ico files instantly).

Stop dealing with upload limits and watermarks. Explore the full suite at FreeClientToolbox.

Prompt Engineering is a Skill. Here is the Free Toolkit to Master It.

Ajay Kumar — Mon, 06 Jul 2026 09:31:42 +0000

""Why is ChatGPT giving me such generic answers?"

I hear this complaint daily. The truth is, Large Language Models (LLMs) are incredibly capable, but they require context, constraints, and specific formatting to shine. If you feed them garbage prompts, you will get garbage output.

To get professional-grade results, you need to treat prompting like coding. And to do that, you need the right IDE (Integrated Development Environment).

I've moved my entire AI workflow to the AI Suite at FreeClientToolbox. It’s a completely free platform that provides visual builders for complex prompts.

Total Privacy for Proprietary Prompts

When building system prompts for enterprise clients, confidentiality is non-negotiable. I cannot risk pasting proprietary business logic into a random online tool that logs inputs. FreeClientToolbox operates under a strict 100% client-side policy. Your prompts are processed locally via Javascript and never touch their servers.

Here is the 8-tool stack that will elevate your AI workflow:

1. Text AI Mastery

ChatGPT Prompt Builder
- Advanced Feature: Forces you to define the "Persona," "Task," "Constraints," and "Output Format" before compiling the final prompt.
System Prompt Builder
- Advanced Feature: Specifically designed for developers using the OpenAI API. It helps you structure rigid boundaries to prevent prompt injections.
GPT Token Calculator
- Advanced Feature: Uses the actual Tiktoken algorithm locally to give you precise cost estimates for GPT-4 and GPT-3.5 before you hit the API.

2. Visual AI Mastery (Midjourney & Stable Diffusion)

Midjourney Prompt Builder
- Advanced Feature: Includes a massive visual library of camera lenses, lighting styles, and rendering engines.
SD Prompt Generator (Optimized for Stable Diffusion weighting syntax).
AI Prompt Extractor
- Advanced Feature: Upload an AI-generated image, and it reads the EXIF data/metadata to reverse-engineer the exact prompt used to create it.

3. Content Refinement

AI Text Humanizer & AI Content Detector
- Advanced Feature: Analyzes text for perplexity and burstiness and rewrites the content to flow with natural human cadence.

Stop writing lazy prompts. Check out the FreeClientToolbox AI Suite and start getting the results you actually want from AI.

The Technical SEO Toolkit That Won't Cost You $99/Month

Ajay Kumar — Mon, 06 Jul 2026 09:25:55 +0000

When I launched my first SaaS, I knew technical SEO was critical. But when I went to sign up for the industry-standard SEO tools, I was hit with $99 to $199 monthly subscription fees. For an indie developer pre-revenue, that’s simply not sustainable.

The reality is that 90% of technical SEO—generating schemas, finding broken links, managing sitemaps—doesn't require expensive cloud crawlers. You can do it all for free if you know where to look.

I recently transitioned my entire technical SEO workflow to FreeClientToolbox, an incredibly robust, 100% free platform.

Why I Trust It (The Security Policy)

What sets this platform apart is its architecture. They don't require you to create an account, they don't ask for your credit card, and they don't harvest your website data. All the tools execute locally in your browser. It’s fast, private, and professional.

Here are the 10 SEO tools I use to audit my sites:

1. Site Crawling & Architecture

Broken Link Checker
- Advanced Feature: Instead of just checking a single page, you can paste an entire sitemap. It recursively checks response codes and flags 404s and 500s.
XML Sitemap Generator
- Advanced Feature: Allows custom priority and changefreq rules before generating the final XML file.
Redirect Checker
- Advanced Feature: Traces the exact hop-by-hop path of a URL to detect infinite redirect loops and chain issues.

2. Search Appearance (Rich Snippets)

Schema Markup Generator & FAQ Schema Generator
- Advanced Feature: Generates valid JSON-LD code for Articles, Products, and Local Businesses with real-time Google syntax validation.
SERP Snippet Preview & Meta Tag Generator
- Advanced Feature: Simulates exactly how your title and description will truncate on both Mobile and Desktop Google search results.

3. Content & Indexing

Robots.txt Generator
- Advanced Feature: Includes predefined templates for WordPress, Shopify, and static sites to prevent accidental de-indexing.
Keyword Density Checker (Analyzes TF-IDF metrics to prevent keyword stuffing).
Website Status Checker (Instant ping and response time metrics).

If you are bootstrapping a startup, bookmark the FreeClientToolbox Homepage. Get your technical SEO foundation right without burning through your runway.

Why I Stopped Pasting JWTs and JSON into Random Online Tools

Ajay Kumar — Mon, 06 Jul 2026 09:19:39 +0000

A few weeks ago, a junior developer on my team pasted a massive JSON payload containing production customer data into a random "Free JSON Formatter" they found on Google.

When I checked the network tab of that tool, the payload was being POSTed directly to their backend server before being returned formatted.

As developers, we handle sensitive data constantly—JWT tokens, database dumps, proprietary SQL queries. We cannot afford to leak this data to third-party servers just because we need to format a string.

This incident sent me down a rabbit hole to find a suite of developer utilities that process data strictly on the client side. That’s when I found FreeClientToolbox.

The 100% Client-Side Architecture

Before I dive into the tools, let me explain why this platform earned my trust. FreeClientToolbox is built entirely on modern Web APIs. There is no backend database processing your files. Whether you are validating JSON or decoding a token, the computation happens directly in your browser's memory. Once you close the tab, the data is gone.

Here are the 8 tools from their developer suite that have permanently replaced my old bookmarks:

1. Data Formatting & Validation

JSON Formatter & JSON Validator
- Advanced Feature: It doesn't just pretty-print; it provides precise line-number error highlighting for syntax mistakes. It can handle JSON files up to 10MB instantly without crashing the browser.

2. Security & Encoding

JWT Decoder
- Advanced Feature: Instantly decodes Header and Payload claims. Because it’s client-side, you can safely paste production tokens here without violating compliance policies.
Base64 Encoder Decoder
- Advanced Feature: Supports live encoding for both text strings and file uploads (great for generating Base64 CSS background images).

3. Database & Logic

SQL Formatter
- Advanced Feature: Supports dialect-specific formatting (MySQL, PostgreSQL, SQL Server) ensuring your queries match your stack's standards.
Regex Tester
- Advanced Feature: Offers real-time visual syntax highlighting for capture groups and provides a cheat sheet overlay so you don't have to leave the page to remember what regex rules do.

4. Utility

XML Formatter (Crucial for dealing with legacy SOAP APIs).
Fake Data Generator
- Advanced Feature: Generates realistic relational data (names, emails, UUIDs) and exports directly to JSON or CSV for database seeding.

If you are a developer who values data security and speed, do yourself a favor and explore the FreeClientToolbox Developer Suite. Stop giving away your data to format a JSON file.

7 Free Client-Side Tools Every Developer Needs in 2026 (Zero Latency & No Signups)

Ajay Kumar — Wed, 17 Jun 2026 07:32:26 +0000

Let's be honest, we all have that one folder of bookmarked tools for formatting JSON, testing Regex, or decoding JWTs. But the problem is that 90% of these "free online tools" are slow, cluttered with ads, and worst of all—they send your data to a backend server.

If you are pasting a production API key or customer JSON data into a random website, you are risking a data leak.

That’s exactly why I spent the last few months building FreeClientToolbox. It's a suite of 180+ tools where everything processes 100% locally in your browser.

Here are 7 tools from the box that you'll probably use every day:

1. The Lag-Free XML/JSON Formatter

Most formatters freeze your browser if you paste a 50MB file. Our XML Formatter uses an isolated iframe architecture. You can paste massive dumps and it formats them instantly without freezing the main thread.

2. Secure JWT Decoder

Never paste your JWTs into cloud servers again. Our JWT Decoder parses the token locally using JS. Your payload never leaves your device.

3. Regex Tester

Write and test complex Regular Expressions in real-time. Completely offline-capable once loaded.

4. Bulk Image Compressor

Compress 50 images at once. Because it uses WebAssembly to compress images directly on your CPU, there are no upload/download wait times.

5. SQL Query Beautifier

Clean up those messy 100-line SQL queries before pasting them into your codebase.

6. JSON to TypeScript Interfaces

Paste a JSON response, and it instantly generates the exact TypeScript types and interfaces you need for your frontend.

7. CSS Flexbox Generator

Visually align items and instantly copy the generated CSS code.

The best part? No login walls, no premium tiers, and absolute data privacy.

Check out the full list of 180+ tools here: FreeClientToolbox.com

Which tool do you use the most in your workflow? Let me know below!

Why I stopped using cloud-based JSON and XML formatters (And what I built instead)

Ajay Kumar — Wed, 17 Jun 2026 07:18:17 +0000

As developers, we constantly copy-paste data into online formatters, decoders, and tools. But have you ever stopped to think where that data goes? If you're pasting an API response with PII (Personally Identifiable Information) into a random cloud formatter, you might be violating compliance rules.

That’s why I created FreeClientToolbox. It’s a suite of over 180 utilities where all processing happens directly in the browser via JavaScript and WebAssembly.

Why Client-Side?

Zero Latency: No waiting for network requests.
Infinite File Sizes: Our XML Viewer & Formatter handles massive files without crashing because it doesn't need to POST the data to a backend.
Absolute Privacy: Unplug your internet after loading the page, and the tools still work!

I built this for the community. Try it out and let me know your thoughts!

(If you have 10 seconds, test the XML formatter with a huge file and let me know if it lags for you!)