DEV Community: Piczilo

How I Built Piczilo: Privacy-First Image Tools That Run in Your Browser

Hussain Sheikh — Fri, 28 Aug 2026 05:39:55 +0000

How I Built Piczilo: Privacy-First Image Tools That Run in Your Browser

Images are part of almost every modern website, but preparing them for the web can be frustrating.

You may need to compress a large image, resize it to an exact dimension, convert it to another format, or remove its background. Many online tools can handle these tasks, but they often require users to upload their files to a remote server.

That is why I built Piczilo.

Piczilo is a collection of free image tools designed to perform common image-processing tasks directly inside the browser.

Why I Built Piczilo

I wanted to create an image toolkit with three simple principles:

Easy to use
Fast on desktop and mobile
Privacy-friendly by default

For supported tools, the image is processed locally in the user’s browser. This means the file does not need to be uploaded to Piczilo’s server before it can be processed.

What You Can Do With Piczilo

Piczilo currently provides tools for several common workflows.

Compress Images

You can reduce image file sizes while maintaining useful visual quality.

Supported compression tools include:

Compress JPG
Compress PNG
Compress WebP
Compress images to specific file-size targets

This can help improve website loading speed, reduce storage usage, and meet upload-size requirements.

Resize Images

Piczilo can resize images to custom dimensions and includes tools for frequently used sizes.

This is helpful when preparing images for:

Websites and blogs
Social media
Application forms
Profile pictures
Online marketplaces

Convert Image Formats

Users can convert images between popular formats such as:

JPG
PNG
WebP
PDF
ICO

The goal is to make everyday conversions simple without requiring desktop software.

Create and Edit Images

Piczilo also includes tools for tasks such as:

Removing image backgrounds
Creating favicon files
Generating specific image sizes
Preparing images for web projects

How Browser-Based Processing Works

A traditional online image tool usually follows this process:

The user selects an image.
The image is uploaded to a remote server.
The server processes the image.
The processed file is downloaded.

Piczilo aims to handle supported operations inside the browser instead.

The browser reads the selected file, applies the requested transformation, and creates the downloadable result locally.

This approach offers several benefits:

Less waiting for uploads
Reduced server dependency
Better privacy for users
A smoother experience for smaller image tasks

Technical Challenges

Building image tools for the browser introduced some interesting challenges.

Managing Large Files

Large images can consume significant browser memory. The application needs to process them carefully and release resources when they are no longer required.

Maintaining Image Quality

Compression is a balance between file size and visual quality. Aggressive compression may create a smaller file, but the image can become blurry or show visible artifacts.

Supporting Different Browsers

Browser APIs and image-format support can behave differently across devices. Testing on both desktop and mobile browsers has been an important part of the development process.

Improving Mobile Performance

Many users need image tools directly from their phones. I have been working on reducing unnecessary JavaScript, improving loading behavior, and keeping the interface responsive on smaller screens.

What I Learned

Building Piczilo reinforced a few lessons for me:

Privacy can be a practical product feature.
Small tools still need careful performance optimization.
A simple interface often requires a lot of work behind the scenes.
Real user feedback is more valuable than assumptions.
Launching early makes it easier to discover what users actually need.

What Comes Next

I plan to continue improving Piczilo by:

Adding more useful image tools
Improving mobile loading performance
Expanding browser and format compatibility
Making each workflow simpler
Using feedback to prioritize new features

You can try Piczilo here:

👉 https://piczilo.com

I would appreciate feedback from the DEV community.

Which image tool do you use most often, and what feature should I build next?

How I Built Piczilo: Privacy-First Image Tools That Run in Your Browser

Hussain Sheikh — Thu, 27 Aug 2026 09:55:37 +0000

Building simple tools often reveals complicated problems.

I started Piczilo because common image tasks—compressing a photo, resizing it for a platform, converting formats, or creating a favicon—usually require uploading files to an unknown server.

For many users, that creates two concerns:

Where is the image being uploaded?
Is it stored after processing?

I wanted Piczilo to take a different approach: process images directly inside the browser whenever possible.

What is Piczilo?

Piczilo is a collection of free image tools for everyday tasks.

It currently includes tools for:

Compressing JPG, PNG, and WebP images
Compressing images to targets such as 50 KB, 100 KB, 200 KB, and 500 KB
Resizing images and creating platform-specific dimensions
Converting between common image formats
Working with HEIC, SVG, PDF, and favicon files
Preparing passport photos and social media images

The goal is simple: choose a file, adjust the settings, and download the result.

Why browser-based processing?

Privacy was the main reason.

For supported tools, the selected image is processed locally in the user’s browser. It does not need to be uploaded to Piczilo’s server before the result can be created.

This approach also has some useful technical benefits:

Less server storage and processing
Faster feedback after selecting a file
No upload wait for routine image tasks
Lower infrastructure requirements
A clearer privacy model for users

The trade-off is that performance depends partly on the user’s device. Large images and complex formats require careful memory management and validation.

The technology behind it

Piczilo is built with:

Laravel
Inertia
React
TypeScript
Tailwind CSS

Laravel handles routing, localization, SEO metadata, and application structure. React and TypeScript power the interactive image workspaces in the browser.

Each tool has its own input rules, processing logic, output format, and user guidance. Keeping these tools consistent while supporting different formats has been one of the most interesting parts of the project.

Challenges I encountered

1. Validating files safely

A filename or MIME type alone is not always reliable. Image tools need to validate the selected file, its format, dimensions, and size before processing begins.

Clear error messages are equally important. A user should know whether a file is unsupported, damaged, or simply too large.

2. Handling large images

Browser-based processing can consume significant memory, especially on mobile devices.

I had to think carefully about file limits, image dimensions, previews, temporary browser objects, and releasing resources after processing.

3. Producing predictable output sizes

Reducing an image below a specific size is not as simple as applying one fixed quality value.

The tool may need to test multiple quality levels to find a useful balance between visual quality and file size. It also needs to explain that an exact visual result cannot always be guaranteed for every image.

4. Making many tools feel consistent

Compression, resizing, conversion, and document tools have different settings, but the experience should still feel familiar.

I focused on a shared flow:

Choose a file
Review or adjust settings
Process the image
Download the result locally

What I learned

A useful tool does not need a complicated interface.

Users mainly want three things:

A clear explanation of what the tool does
Confidence that their file is handled safely
A predictable download result

I also learned that performance, accessibility, SEO, and privacy cannot be treated as final-stage tasks. They influence architecture and interface decisions from the beginning.

What comes next?

I am continuing to improve mobile performance, expand useful image workflows, and make the instructions clearer for non-technical users.

I would especially appreciate feedback on:

Which image task you perform most often
Whether the privacy explanation is clear
Which additional tool would be genuinely useful

You can try the tools at piczilo.com.

Thanks for reading. I would love to hear what you would improve.