I Built Mariutil: A Browser-Based Toolkit for Developers and Everyday Tasks

Madhu — Tue, 29 Sep 2026 15:38:32 +0000

Over the years, I've used a lot of small online tools while developing software.

A JSON formatter here.

A Base64 encoder there.

A PDF converter when working with a document.

An image compressor when preparing an image.

A hash generator when debugging an API or configuration.

The tools already existed, but I kept opening different websites for simple tasks.

So I started building Mariutil.

👉 https://mariutil.com/

Mariutil is a growing collection of browser-based tools for developers and everyday digital tasks.

The idea is simple:

Build useful tools that are fast, easy to use, and require as little friction as possible.

Why I started building it

I'm a software developer, and I regularly work with APIs, JSON, files, PDFs, images, authentication, and other developer workflows.

Many of the tasks I encounter don't require a large application.

Sometimes I just need to:

Format some JSON
Convert XML to JSON
Encode or decode Base64
Generate a hash
Merge or split a PDF
Extract text from a PDF
Convert images
Compress an image
Generate a QR code
Record the screen
Convert audio to text

These are small problems, but they happen frequently.

That led me to the idea of building a single place for these utilities.

What I've built so far

Mariutil is still under development, but several tools are already live.

Developer tools

The developer-focused tools include:

JSON Formatter
XML → JSON
JSON Mock Generator
Base64 Encoder / Decoder
Hash Generator
Password Generator

These tools are particularly useful when working with APIs, configuration files, testing, and development tasks.

PDF tools

I've also been building a collection of PDF utilities:

PDF Merge
PDF Split
PDF → Text
PDF → JPG
JPG → PDF
PDF → CSV
Word → PDF

The goal is to make common file operations available directly from a browser without requiring users to install desktop software for simple tasks.

Other tools

There are also tools for:

QR code generation
QR and barcode scanning
Screen recording
Audio transcription
Image compression
Image resizing

I'm continuing to add tools as I find useful problems to solve.

A focus on browser-based processing

One of the things I'm particularly interested in is doing as much processing as possible inside the browser.

For tools where browser processing is practical, the user's input can be processed locally instead of being uploaded to a backend server.

For example, this approach can be useful for:

JSON processing
Base64 encoding and decoding
Hash generation
Image processing
Some PDF operations
Some audio processing

👉 https://mariutil.com/

The exact architecture depends on the tool.

The principle I'm trying to follow is:

If a task can be safely and efficiently performed in the browser, why send the data to a server?

This also makes the tools simple to deploy and reduces the amount of infrastructure required for many utilities.

Building each tool is its own engineering problem

At first, many of these tools seem very simple.

For example, an image compressor sounds like:


text
Image → Compress → Download

DEV Community: Madhu

I Built Mariutil: A Browser-Based Toolkit for Developers and Everyday Tasks

Why I started building it

What I've built so far

Developer tools

PDF tools

Other tools

A focus on browser-based processing

Building each tool is its own engineering problem