Why I Built FileZenith: A 100% In-Browser PDF & Image Studio (Zero Server Uploads)

Aradhya Pathak — Sat, 03 Oct 2026 03:33:22 +0000

Every time you want to compress a PDF, convert a document, or resize a photo for a government job form, traditional online tools ask you to do the same dangerous thing:

"Upload your file to our server."

Think about what users upload every single day:

Income tax returns and bank statements
Medical records and health insurance forms
Government IDs (Passports, Aadhaar cards, Social Security numbers)
Confidential legal contracts

Most popular web tools send these sensitive files to remote servers across Europe or the US, process them behind closed doors, and promise to "delete them within 2 hours."

As an engineer, that didn't sit right with me. With modern browser capabilities, why should your private documents ever touch someone else's server?

So, I built FileZenith — an all-in-one private file and document studio that runs 100% locally inside the user's browser.

🛡️ The Architecture: How Does Zero-Server Processing Work?

Traditional online converters are client-server apps. FileZenith is engineered as a client-side execution sandbox:

⚡ WebAssembly & In-Memory Buffers: Documents are loaded into browser memory as ArrayBuffer and Uint8Array byte streams.
🎨 Canvas GPU Acceleration: Image transformations, format conversions (WebP ↔ JPG), cropping, and DPI adjustments are rendered directly on the user's local GPU using the HTML5 Canvas API.
🔒 Pure Client-Side Privacy: Zero megabytes of user data are transmitted over the network. Once the tab is closed, memory is instantly garbage-collected.

Because compute runs on the client machine, FileZenith has $0 cloud compute costs, allowing it to be 100% free forever with no subscriptions or paywalls.

🚀 What Can You Do on FileZenith?

Over the past few weeks, I’ve expanded FileZenith into a comprehensive suite of 30+ specialized tools:

1. 📄 Advanced PDF Studio

Compress PDF to 100KB & 1MB: Multi-stage raster and stream optimizer to shrink PDFs down to exact portal target sizes.
Edit PDF Online: Interactive text editor, content whiteout redaction, markup drawing, and digital signatures.
Merge, Split & Organize: Combine multi-page PDFs or extract custom page intervals with drag-and-drop reordering.
PDF to Word & Word to PDF: In-browser bidirectional document conversion.
Protect & Unlock PDF: Standard 128-bit/256-bit client-side encryption.

2. 🖼️ Image Engineering

WebP to JPG & JPG to WebP: Batch conversion with custom compression sliders and white alpha-background fills.
Color Palette Extractor: K-Means clustering algorithm to extract hex palettes from photos.

3. 🏛️ Government Exam & Recruitment Resizers

Exact specification presets for Railway RRB (20–50KB, 320x240px), IBPS/SBI PO (200x230px), and JEE/CUET with automated Date of Photograph (DOP) stamps.

4. 🛠️ Developer & Everyday Utilities

Hash Generator: Live MD5, SHA-1, SHA-256, and SHA-512 checksum calculator for strings and binary files.
URL Encoder / Decoder: RFC 3986 parameter inspector.
Electricity Bill Calculator: Multi-state tariff slab and solar deduction simulator.

💡 Try It Out & Share Your Thoughts!

FileZenith is live, completely free, and open to everyone:

👉 Live Web App: https://www.filezenith.com

👉 GitHub Repository: https://github.com/AaradhyaproK/pdf

I'm continuously building and refining the toolset. What other file formats or client-side utilities would make your daily workflow faster?

Drop your feedback in the comments below! 👇✨

Why I Built FeeKit: A Fast, In-Browser Fee & Net Payout Calculator for Freelancers

Aradhya Pathak — Fri, 02 Oct 2026 15:38:17 +0000

Every freelancer and digital agency owner knows the quiet frustration of payment day:

You send an invoice for $1,000, expecting a clean payout to your business account. But when the funds clear via Stripe or PayPal, you receive $962.40 (or worse, after international conversion and cross-border interchange cuts).

Surprise deductions chip away at hard-earned margins.

When I looked for calculators to solve this, I found three recurring problems:

Outdated formulas: Most online calculators still use fee structures from 2021.
Aggressive ad bloat: Popups, slow loading scripts, and layout shifts that take 5 seconds to load.
Data harvesting: Demanding sign-ups, email capture, or storing transaction numbers on third-party databases.

So, I decided to build a fast, modern, and privacy-first solution: FeeKit.

🚀 What is FeeKit?

(https://www.usefeekit.com)** is a lightweight, zero-latency web utility designed for freelancers, indie hackers, and global contractors to compute payment processing deductions and reverse invoice amounts instantly.

Here is what it does right out of the box:

⚡ Up-To-Date Fee Formulas:** Accurately calculates standard domestic and cross-border transaction fees for Stripe, PayPal, and major payment rails.
Reverse Billing (Net-to-Gross):** Ever wondered, "How much should I invoice my client so I walk away with exactly $2,500 in my pocket?" FeeKit calculates the gross invoice amount required to absorb processing fees completely.
100% Client-Side Privacy:** Financial figures belong to you. All calculations run strictly inside your browser's local memory. Zero financial data is ever dispatched to an external server.
Zero Sign-Up Required:** No account creation, no password fatigue, and no paywalls. Just open the tool, calculate, and get back to building.

🛠️ The Tech Stack Behind FeeKit

I wanted FeeKit to feel as instantaneous as a native desktop utility:

Next.js 16 (App Router): Pre-rendered static pages deployed on edge CDN nodes for sub-100ms Time to First Byte (TTFB).
Pure Client-Side Math: Mathematical formulas execute in JavaScript memory without network roundtrips.
Clean Dark Mode UI: Engineered with an obsidian dark theme, zero layout shifts (CLS = 0), and keyboard-friendly responsive inputs.

💡 Try It & Share Your Feedback!

FeeKit is 100% free and live on the web:

👉 Live Platform: https://www.usefeekit.com

I'd love to hear your thoughts, feedback, and feature requests:

What other payment gateways or international currencies would you like to see?
Are there specific local tax formulas (VAT / GST) that would make your billing workflow smoother?

Drop your comments below! Happy invoicing! 💻✨

DEV Community: Aradhya Pathak