HaruTools Lab

Professional tools, right in your browser.
Free online utilities for image editing, documents, calculations, and electrical engineering. No registration required.

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Image Compression & Conversion

Bulk Image CompressorReduce file size significantly PNG CompressorKeep transparency & save space WebP ConverterConvert to next-gen format WebP → JPGTo universal format WebP → PNGTo transparent format JPG → PNGConvert to PNG format PNG → JPGConvert with white background HEIC → PNGConvert iPhone photos Video → GIFAnimate your videos

Image Processing & Editing

ResizeChange dimensions CropRounded or free selection Square Image MakerAdd padding for SNS Filter EffectsColor correction & FX Brightness & ContrastAdjust light levels MonochromeBlack & White or Sepia Mosaic & BlurHide personal info Remove BackgroundMake specific colors transparent Add TextInsert custom captions Add WatermarkAnti-copy protection Rotate Tool90-degree or custom angle Flip ToolMirror horizontal/vertical Image OverlayMerge two images

Color, Analysis & Comparison

RGB → HEXColor code conversion HEX → RGBColor code conversion Color PickerExtract color from screen Color Code ListNames and hex codes Image ComparisonSide-by-side view Image MeasurementMeasure sizes within image

PDF & Document

PDF MergeCombine multiple files Image → PDFConvert photos to PDF PDF → ImageExport PDF as JPG/PNG

Utilities

QR Code GeneratorURL or text to QR Favicon GeneratorCreate .ico icons Remove ExifDelete location & camera info Pixel Art MakerDraw digital pixel art

Text & Content

Character CounterCount chars, lines, and pages Text Search & ExtractFind specific words or spaces Text CleanerRemove line breaks/chars Special CharactersCopy symbols for web JSON/XML FormatterBeautify your code

Calculation Tools

Time CalculatorCalculate duration & values Base ConverterBinary, Oct, Dec, Hex conversion

Electrical & Electronics

Resistor Color Code (4)Calculate 4-band resistors Resistor Color Code (5)Calculate 5-band resistors Total ResistanceSeries & parallel calculations Ohm's Law CalculatorV, I, R, and Power Energy Cost CalculatorCalculate power & electricity bill RLC Circuit CalcImpedance & vector diagrams AC Power CalculatorActive, Reactive, Apparent Logic Circuit SimulatorDigital circuit experiment
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Why Choose HaruTools Lab?

HaruTools Lab is a collection of over 50 online tools designed to support designers, developers, engineers, students, and everyday users with tasks they need to solve "right now."

1. Secure Browser Processing (Privacy First)

Unlike many online services, all processing is done locally on your browser (client-side). Your images, PDFs, and sensitive code are never sent to an external server. You can use it with confidence for professional or educational tasks.

2. No Registration & Completely Free for Commercial Use

No account creation or login required. All features are provided for free without limitations. Data processed on our site can be used commercially without any need for credit or attribution.

3. No Installation & Mobile Friendly

There is no need to install heavy software. As long as you have a browser, HaruTools Lab works smoothly on Windows, Mac, iPhone, and Android devices.

Frequently Asked Questions (FAQ)

Q. Is there any cost to use this service?

A. No, all tools are completely free to use. There are no hidden fees or premium plans for specific features.

Q. Is registration or login required?

A. Not at all. Simply visit the site, choose your tool, and start working. We do not collect any personal information like email addresses.

Q. Where are my uploaded files saved?

A. They aren't saved anywhere. Our tools use JavaScript to process files within your browser, so files are never transferred to a server. Once processing is finished, the data exists only on your local device.

Q. Can I use the processed results for commercial purposes?

A. Yes. You are free to use them for business documents, blog content, social media posts, product packaging, and any other professional scenario.

Q. Does it work on smartphones (iPhone/Android)?

A. Yes, every tool is responsive and provides full functionality on mobile and tablet browsers just like the desktop version.

Q. What should I do if a tool doesn't display correctly?

A. Please ensure your browser is updated to the latest version. Sometimes "Private Mode" or browser extensions (like ad blockers) may interfere with the scripts. If the issue persists, please try a different browser.