About Us

ZeroDataUpload

The Story Behind ZeroDataUpload

It started with a frustration most of us know too well. You need to convert a PDF, compress an image, or merge a couple of files — simple stuff. So you search online, find a tool, upload your file... and then wonder: where did that file just go? Who has access to it now? Is some random server halfway around the world storing a copy of your tax document or family photo?

That question kept bugging Milan Salvi, the founder of Leena Software Solutions. As a developer working with browser APIs and client-side JavaScript for years, he knew the technology already existed to handle most of these tasks right inside your browser — no upload needed. The gap wasn't technical. It was that nobody had built a proper platform around that idea.

So in early 2025, ZeroDataUpload was born. Not as a startup chasing venture capital, but as a straightforward answer to a straightforward problem: give people useful tools that don't touch their data.

Company Details

• Business Name: Leena Software Solutions
• Founder: Milan Salvi
• Location: Ambernath East, Maharashtra, India (PIN 421501)
• Website: milansalvi.com
• Email: leenasoftwaresolutions@gmail.com

What We Actually Build

ZeroDataUpload is a collection of 31+ browser-based tools and converters. PDF merging and splitting, image format conversion between HEIC, WebP and standard formats, code formatting, currency conversion, Morse code translation, OCR text extraction — the list keeps growing. Every single tool runs entirely in your browser using JavaScript, WebAssembly, and native browser APIs.

That means when you drop a file into one of our converters, it never leaves your computer. There's no upload progress bar because there's nothing to upload. Your browser does the heavy lifting, and the result downloads straight to your device. We literally cannot see what you're working on, even if we wanted to.

Everything is free, with no usage caps, no "upgrade to pro" prompts, and no account creation. You open the tool, use it, and move on.

How the Technology Works

If you're curious about the technical side: every tool on ZeroDataUpload is built with client-side processing at its core. When you load a page, your browser downloads the tool's JavaScript code. From that point on, all the work — parsing files, running conversions, generating outputs — happens locally on your machine.

Take our image converter as an example. When you convert a HEIC photo to JPEG, the browser's Canvas API handles the pixel manipulation. The heic2any decoder library runs in your browser's memory. The output file gets generated and offered as a download. At no point does any of that data travel over the network to our servers.

For heavier tasks like media conversion, we use WebAssembly (basically compiled C code running in the browser) to get near-native performance. The FFmpeg core that powers our media converter is loaded once and then works entirely offline.

We also use LocalStorage to remember your preferences — like dark mode settings or recent conversion history — so things feel faster the next time you visit. But that data stays in your browser too.

Why We Chose This Approach

Honestly, building everything client-side is harder than the traditional upload-process-download model. Server-side tools are simpler to build and easier to scale. But they come with a cost most users don't think about: your files pass through someone else's infrastructure, get stored (even temporarily) on someone else's servers, and you have to trust that they'll be deleted properly.

We didn't want to ask for that trust. By keeping everything in the browser, we removed ourselves from the equation. There's no server to breach, no database of user files to leak, and no employee who can peek at uploaded documents. The privacy isn't a policy — it's baked into the architecture.

Does this mean some things are trickier? Sure. Large file processing depends on the user's device capabilities. Some operations that would be instantaneous on a beefy server take a few extra seconds in a browser tab. But for the vast majority of everyday tasks, the trade-off is well worth it.

What You Get

No subscriptions, no paywalls. Every tool we build is available to everyone for free. We keep the lights on through advertising (specifically Google AdSense), which means you might see some ads on the pages. That's it — that's the entire business model. We show some ads, you get free tools that respect your privacy. Seems like a fair deal to us.

There are no usage limits either. Convert 500 images in a row if you need to. Batch-process a folder of PDFs. Run the unit converter a thousand times. We genuinely don't care how much you use it — remember, your browser is doing the work, not our servers.

The tools work across Chrome, Firefox, Safari, and Edge on desktop, tablet, and mobile. We've also set up PWA support, so you can add ZeroDataUpload to your home screen and use several tools even when you're offline.

Meet the Founder

Milan Salvi runs Leena Software Solutions and handles everything from architecture decisions to writing the code to authoring the blog articles. Before starting ZeroDataUpload, he spent years working with JavaScript, browser APIs, Node.js, and web security — the kind of hands-on experience that made building a client-side platform a natural fit.

Milan has written 36 in-depth technical articles on the ZeroDataUpload blog, covering topics like AES-256 encryption internals, browser codec pipelines, Unicode text encoding, OCR technology, and practical guides for every tool on the platform. These aren't marketing fluff — they go deep into how the technology actually works.

His goal has always been pretty simple: build tools that people find genuinely useful, and do it in a way that doesn't compromise their privacy. Read Milan's full profile and articles →

Last Updated: April 3, 2026