Free online tools for images, PDFs, file conversion, calculators, and everyday productivity.

HaruTools Lab provides more than 50 free browser-based tools that work without installation or registration. Compress images, convert files, edit PDFs, perform engineering calculations, and complete everyday digital tasks directly in your web browser.

Popular Tools

These are some of the most popular tools available on HaruTools Lab. All tools are free to use and work directly in your browser.

Looking for more? Browse our complete collection of Image Tools, PDF Tools, Calculators, and Color Tools.

Convert Images to PNG Convert images to the lossless PNG format Convert Images to JPG Convert images to the widely supported JPG format Pixel Art Maker Draw custom pixel graphics Merge PDF Combine files into one document 4-Band Resistor Code Calculate resistance from bands RLC Calculator Perform electrical circuit calculations.

About HaruTools Lab

HaruTools Lab is a collection of free online tools designed to simplify everyday digital tasks. Whether you need to compress images, convert file formats, edit PDF documents, or perform engineering calculations, you can use our tools directly from your browser.

Our website focuses on simplicity, speed, and accessibility. There is no software to install, no registration required, and new tools are added regularly to support students, professionals, developers, designers, and everyday users.

Available Languages

HaruTools Lab is available in multiple languages. Choose your preferred version below.

English 日本語

Browse Tool Categories

Browse image tools, PDF tools, file converters, calculators, color tools, and many other browser-based utilities.

Every tool is designed to be simple, fast, and accessible from modern web browsers without requiring software installation or user registration.

Image Compression & Conversion Compression, resizing, format conversion and optimization. Image Processing & Editing Crop, resize, rotate, blur, and edit images directly in your browser. PDF Tools Merge, split, rotate and organize PDF documents. Calculators Electrical, engineering, math, and everyday online calculators. Color Tools HEX, RGB, HSL and color utilities. View All Tools Browse the complete collection of free online tools.

Why Choose HaruTools Lab?

Fast Processing Most tools run directly in your browser for quick results.
Privacy Focused Your files stay on your device whenever browser processing is available.
No Registration Start using every tool immediately without creating an account.
Works Everywhere Compatible with desktop computers, tablets, and smartphones.
Always Free Use every tool without subscriptions or hidden fees.
Regularly Updated New online tools and improvements are added continuously.

Who Is HaruTools Lab For?

HaruTools Lab is designed for people who need simple browser-based utilities for everyday digital tasks. The tools may be useful for students, office workers, developers, designers, engineers, creators, and other users who occasionally need to perform tasks such as image processing, file conversion, text manipulation, or calculations.

The site is intended to make these individual tasks easier to complete without requiring users to install specialized software or create an account for each tool.

Frequently Asked Questions

Q. How can HaruTools Lab provide its tools free of charge?

A. HaruTools Lab provides its online utilities free of charge and supports the operation of the website through advertising and other website resources. This allows users to access the tools without a paid subscription for the basic services provided by the site.

Q. Are my files uploaded to a server?

A. Many HaruTools Lab tools are designed to process files directly within the user's browser. For these tools, the file processing takes place locally on the device rather than through a remote file-processing service. Because processing methods can differ between tools, please check the individual tool page for specific information about how files and data are handled.

Q. Do I need to install software or a browser extension?

A. The browser-based tools provided by HaruTools Lab do not require dedicated software installation or a browser extension. They are designed to work with modern web browsers, although available functions and compatibility may vary depending on the browser, device, and individual tool.

Q. Can I process multiple files at once?

A. Some image and file-processing tools support multiple files in a single session. The available number of files and supported operations depend on the individual tool. Please check the relevant tool page for details before processing a large number of files.

Q. Does image compression reduce image quality?

A. Image compression can affect file size and, depending on the compression method and settings, may affect image quality. The result depends on the image format, source file, and options available in the individual compression tool. Where supported, users can adjust the available settings to find a suitable balance between file size and image quality.

Continuous Development

HaruTools Lab is an ongoing project. We continue to review existing tools and make improvements where necessary, including usability improvements, compatibility updates, bug fixes, and additional functionality.

We aim to develop practical browser-based utilities that are straightforward to understand and useful for specific everyday tasks. Feedback about problems, unclear instructions, or potential improvements can be submitted through the site's contact page.