Deepak Kumar — the developer behind DocoPDF
One developer in India, one promise — your files never leave your device.

Deepak Kumar
Founder & developer — DocoPDF · TRIVANTA AGRO
I'm Deepak Kumar — I design, build, test and ship every part of DocoPDF myself: the tools, the self-built PDF engines, the servers, the Hindi translations, even this page. What started as a frustration with upload-happy PDF sites became a complete toolbox that runs entirely on your device.
- India
- Solo developer
- 144/147 tools live
- ₹0/month infrastructure
The story
The first version was small — a handful of tools that merged and split PDFs right in the browser. But the idea was fixed from day one: if a job can be done on your device, it should be.
The turning point came from another world. Years spent beside poultry farmers, dealers and field teams — work that later grew into TRIVANTA AGRO — showed how much daily business still runs on manual paperwork and tools that demand your files. Watching people hand sensitive documents to random upload sites settled it: honest tools had to exist, and they had to run on your own device.
Since then the toolbox has grown to 147 tools — OCR that reads Hindi, e-invoice generation, digital signatures, image work — and every engine powering them is self-hosted, so nothing calls home to a third-party CDN.
There is no team, no office and no investor. There is a build queue, an owner console, a coffee — and the belief that honest software beats loud marketing.
How DocoPDF is built
One codebase
Next.js and TypeScript render every page and power every client tool — the same code runs on the server for SEO and in your browser for speed.
Real local processing
WebAssembly engines and web workers do the heavy lifting in background threads — merging, OCR, compression — on your device, with no uploads and no network round-trips.
Self-hosted, zero CDNs
The PDF renderer, the OCR models, the Hindi fonts, the QR engine — all served from DocoPDF's own domain. Nothing loads from third parties.
₹0/month infrastructure
Free tiers only — Vercel, Turso, GitHub. No ads, no investor money, no data selling. Costs stay at zero, so the everyday tools stay free.
What I build by
Privacy is a feature, not a settings page — it is the default state of every tool.
Everyday work stays free, forever — no watermarks, no tricks.
Honesty in the UI: mode badges tell you exactly where your file goes.
English and हिंदी as equals — including inside generated PDFs.
Ship small, verify everything — every tool passes end-to-end tests before it goes live.
The craft behind the tools
Self-built PDF engines — parsing, writing, forms, digital signatures, written from scratch
On-device OCR in Hindi & English — runs entirely in your browser, powered by WebAssembly
WebAssembly & web workers — heavy work in background threads, never on a server
Next.js + TypeScript — one codebase for SEO-fast pages and client-side speed
Devanagari typography — real Hindi text shaping inside generated PDFs
E-invoice formats — IRP-aligned XML/JSON generation and validation
Zero-cost infrastructure — Vercel, Turso and GitHub free tiers, nothing else
SEO & performance — structured data, sitemaps and Core Web Vitals, done by hand
Beyond DocoPDF — TRIVANTA AGRO
The same hands, a second platform. While DocoPDF serves everyday document work, TRIVANTA AGRO serves India's poultry industry — farmers, dealers and businesses — with the same farmer-first, honesty-first thinking.
The story
From understanding the ground realities of poultry operations — farms, dealer networks, field-level sales — to shaping digital tools around how people actually work, not how reports say they should.
The platform
Farmer calculators, records and daily-operations tools at trivantaagro.com — simple enough for a first-time smartphone user, dependable enough to run a business on.
The belief
Every system has a human purpose behind it. A farmer saving time on records and a student compressing a PDF deserve the same care — tools that simply work.
Technology should not replace people — it should empower them.
Frequently asked questions
Try the toolbox — or say hello
Every tool is one click from home, no signup. And if you have an idea, a bug or just a hello — the contact form reaches me directly.