Image Converter

Convert formats, compress images, and convert HEIC to JPG

How It Works

The converter handles format conversion and compression entirely in your browser. Choose an image, pick JPEG, WebP, or PNG as the output, and set either a quality level or a target file size. The page re-encodes the image locally and shows the original and converted sizes side by side before you download. Nothing is uploaded to a server.

For HEIC files, the default photo format on iPhone, the tool tries more than one decoding method so it works across different browsers.

What is HEIC? HEIC (High Efficiency Image Container) has been Apple's default photo format on iPhones since iOS 11. It compresses better than JPEG at the same quality, but support outside the Apple ecosystem is patchy. Converting to JPEG makes a photo open everywhere.

Key Features

HEIC to JPG

Convert iPhone photos to a format that opens everywhere.

Format conversion

Convert between JPEG, PNG, and WebP.

Two compression modes

Pick a quality level, or set a target file size and let the tool find the quality that fits.

Private

All processing happens locally. Your images stay on your device.

Supported Formats

Input Formats	Output Formats
HEIC / HEIF (iPhone photos)	JPEG (best compatibility)
JPEG / JPG	PNG (lossless, transparency)
PNG	WebP (modern, efficient)
WebP
GIF
BMP

HEIC Conversion

HEIC support varies by browser, so the converter tries two methods in order. First it asks the browser to decode the file natively, which works in Safari. If that fails, it falls back to libheif-js, a WebAssembly decoder that runs in any modern browser and is only downloaded when a HEIC file actually needs it.

Note: Some HEIC files use codecs that neither method can decode. If conversion fails, try Safari, or convert the file first with Apple's Preview or Photos app.

Compression Quality

When converting to JPEG or WebP there are two ways to control file size.

In quality mode, a slider from 1 to 100% sets the encoding quality directly. Higher values keep more detail and produce bigger files. The live size comparison updates as you adjust it, so you can see what a setting actually costs before downloading. Something in the 80s is a sensible starting point for sharing; go higher for printing or archiving, lower for thumbnails.

In target file size mode, you enter a size in KB or pick a preset (50 KB up to 1 MB), and the tool searches for the highest quality that fits under that limit. This is useful for upload forms with hard size caps. If the target cannot be reached even at the lowest quality, the tool says so; reducing the image dimensions first is the fix. PNG is excluded from this mode because it is lossless, so its size cannot be dialed down to an arbitrary number.

Format Comparison

Format	Best For	Transparency	File Size
JPEG	Photos, universal sharing	No	Small
PNG	Graphics, screenshots, transparency	Yes	Large
WebP	Modern web, best compression	Yes	Smallest

Common Use Cases

Convert HEIC photos to JPEG so they open on Windows and older software.
Convert PNG screenshots to WebP for smaller web pages.
Compress large photos before attaching them to email.
Hit an exact size limit on an upload form with target file size mode.
Convert to PNG when you need lossless output.

Tips for Best Results

Use JPEG for photos that don't need transparency. It gives small files at good quality and opens everywhere.
Use PNG for screenshots, graphics, or anything that needs transparency.
Use WebP when the destination supports it. It usually beats JPEG at the same quality.
Start around 85% quality and lower it only if the file is still too large.
If a HEIC file won't convert, try Safari, which has the best native HEIC support.

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