Drop HEIC files here

HEIC (High Efficiency Image Container) has quickly become the default image format for iPhones and iPads because of its ability to deliver high-quality images at a much smaller file size. But while HEIC is excellent for storage efficiency, it creates major compatibility problems. Many websites, online forms, desktop apps, Android devices, and even professional design tools still do not support HEIC natively. This becomes frustrating when you need to upload, resize, or convert your images to formats like JPEG, PNG, or WebP.

That is exactly why we built our HEIC Resizer & Converter — a fast, private, browser-based tool that lets you resize, transform, optimize, and convert HEIC images instantly.

The Ultimate Guide to How Our HEIC Resizer Works

Our HEIC Resizer is designed for anyone who wants complete control over image dimensions, quality, file size, and format — without installing apps or uploading photos to external servers. Whether you are a designer, student, photographer, marketer, or casual user, this tool gives you a professional-grade workflow inside a simple browser interface.

Unlike traditional online converters that upload your files to a server (which can be slow and risky), our system operates 100% client-side. Your images never leave your device. Everything — conversion, resizing, scaling, compression, exporting — is performed in your browser’s memory.

Below, we break down the exact technology and pipeline powering the tool.

How It Works: Inside the Technology

Our HEIC resizer is built on a modern, privacy-first, high-performance architecture. Here is the complete technical breakdown of each step, designed to be easy to understand while showcasing the engineering behind the tool.

1. Client-Side HEIC Decoding (Powered by heic-to)

Most browsers still cannot natively open or manipulate HEIC files. This means we need a specialized decoder to transform HEIC into a format the browser understands. We use the heic-to library, a fast WebAssembly-based decoder. When you drag and drop a HEIC file, the decoder converts the HEIC data in

2. High-Fidelity Canvas Resizing Engine

Once you choose your output dimensions or format and click Convert/Download, the real processing begins. The HTML5 Canvas API is used to handle pixel manipulation at high accuracy. The engine reads your chosen Width, Height, Format, DPI, and Quality settings. It resizes the decoded image while maint

3. Smart Compression & File Size Targeting

One of the most advanced features of this tool is Target File Size (KB) — a feature rarely found even in professional editing software. If you specify a max file size (e.g., 500 KB), the engine begins an iterative compression process. It performs a binary search across compression levels (0.9 → 0.1)

Key Features of the HEIC Resizer Tool

100% Private & Secure No files are uploaded to a server. Everything runs in your browser’s RAM. Works even offline once the page is loaded. This makes it one of the safest HEIC tools on the internet.
Precision Image Control You can fine-tune every part of your output: Custom Width & Height Aspect Ratio Locking High-DPI Scaling (for printing) Quality Adjustment Slider Target File Size Compression Whether you're reducing a
Lightning-Fast Batch Processing If you have dozens of HEIC images, no problem. Drag & drop all files at once. They are decoded and queued automatically. Processing runs efficiently without slowing your browser (within your memory li
Advanced Preview & Comparison Before downloading, you can: Zoom into images to inspect details Compare: Original vs. resized resolution Original file size vs. compressed output This ensures you always know exactly what you're gett

Technical Specifications

This is the same level of capability you’d expect from a desktop application — in a free, browser-based interface.

Input Formats: HEIC, HEIF
Output Types: JPEG, PNG, WebP
Core Engine: HTML5 Canvas + WebAssembly (heic-to)
Compression Types: Lossy & Lossless
DPI Options: 72, 150, 300 DPI
Batch Limit: Restricted only by available device memory

Frequently Asked Questions

Is it free to resize HEIC images?

Yes, our HEIC resizer is completely free to use. There are no hidden costs or limits on the number of files you can process.

Are my images uploaded to a server?

No. Your privacy is our top priority. All resizing and conversion happens directly in your web browser. Your files never leave your computer.

Can I resize multiple HEIC files at once?

Absolutely! Our tool is built for batch processing. You can upload multiple files, configure the settings once, and apply them to all images simultaneously.

What happens to the image quality when I resize?

Making an image smaller (downscaling) generally preserves quality well. Making it larger (upscaling) can reduce sharpness. Our tool gives you control over the final compression quality for formats like JPEG to manage the trade-off.

Will resizing remove the metadata (EXIF data)?

Yes, the process of resizing an image using a web canvas inherently strips away the original metadata, including GPS location and camera settings. This is a great feature for protecting your privacy.