How to Convert Images Online: JPG, PNG, WEBP, and HEIC

Images come in many formats, and the wrong one causes real problems: photos that will not upload, logos with ugly white boxes, iPhone pictures that websites refuse to open. Converting an image to the right format solves all of these - and it takes seconds in your browser.

This guide covers how to convert images online between the four formats that matter most - JPG, PNG, WEBP, and HEIC - and which one you should choose for photos, logos, screenshots, and the web.

When do you need to convert an image?

Conversion solves problems that format mismatch creates. Common situations:

• A PNG file is too large for a website - JPG or WEBP will shrink it dramatically
• A logo has a white background from a PNG to JPG conversion - you actually want to keep transparency
• An iPhone photo (HEIC) will not open in Windows, email, or an upload form - convert to JPG
• A WEBP image looks wrong in an old tool or CMS - convert to PNG or JPG
• A screenshot needs transparency or editing - convert JPG to PNG
• A website is loading slowly because of heavy images - convert to WEBP

Almost every conversion task falls into two buckets: making a file smaller, or making a file more compatible. Understanding which bucket you are in tells you the right output format.

The four formats you need to know

JPG is the universal format for photographs. PNG is the safe choice for anything with sharp edges, text, or transparency. WEBP combines the best of both and wins on file size. HEIC is Apple's efficient format for phone photos - efficient, but poorly supported outside Apple's ecosystem.

PNG to JPG: when the file is too big

PNG stores images losslessly, which makes it heavy - especially for photos. Converting PNG to JPG is the fastest way to make a photo-based file dramatically smaller and universally shareable.

A quick example of the size difference you can expect:

That is often a 5-10x reduction just from the format change. If your PNG has no transparency and is mostly photographic, converting to JPG is the right move.

JPG to PNG: when you need quality or transparency

JPG to PNG is the reverse journey, and it is the right choice when you need transparency, a lossless copy, or an image you plan to edit repeatedly without quality loss building up.

Use it for:

• Adding transparency - not directly, but a PNG result is ready for tools that need it
• Graphics and screenshots - text and sharp edges stay crisp
• Editing workflows - each save as PNG adds no further quality loss

HEIC to JPG: iPhone photos everywhere

If you own an iPhone, most of your photos are HEIC (or HEIF). The format is efficient and beautiful on Apple devices, but Windows apps, older websites, some email clients, and many upload forms simply will not open it.

Converting HEIC to JPG makes your photos work anywhere while keeping near-original quality - the standard fix before sending photos to someone on another platform or uploading to a service that rejects HEIC.

Converting WEBP: to PNG, to JPG, and to WEBP

WEBP is the modern web format: smaller than JPG and PNG at equal quality, with support in every major browser. Two conversion directions matter:

• Image to WEBP - when you want the smallest possible file for a website
• WEBP to PNG or JPG - when a tool, plugin, or old system does not accept WEBP

For websites, converting your hero images and photos to WEBP is one of the highest-impact optimizations available - the files are typically 25-35% smaller than JPG with identical visual quality. Use the WEBP Converter when you need to go the other way.

How to convert images in your browser

Every conversion here works the same way, on any device:

1. Open the tool for the conversion you need - PNG to JPG, JPG to PNG, HEIC to JPG, or Image to WEBP.
2. Select the image file.
3. Run the conversion and download the result.
4. Open the output and confirm the look, especially colors and any transparency.

Because everything is processed locally in your browser, there is no waiting for uploads and no file ever leaves your device - which also makes it safe for private photos.

Common image conversion mistakes

• Converting transparent PNG to JPG - transparency becomes a white (or black) box
• Choosing PNG for photos - huge files for no visible gain
• Saving and re-saving JPG repeatedly - each save applies more lossy compression
• Forgetting HEIC cannot open everywhere - convert before you share, not after the recipient complains
• Converting a large image without resizing - the format changes but dimensions stay huge
• Using upload-based converters for private images - prefer local, browser-based tools

Which format should you choose?

A quick decision guide for the most common situations:

• Website photo - WEBP (or JPG for maximum compatibility)
• Logo or icon - PNG or WEBP, keep transparency
• Email attachment - JPG, compressed to a reasonable size
• iPhone photo for someone on Windows - JPG
• Screenshot for a document - PNG for crisp text
• Print - high-quality JPG or the original file

If you are also trying to shrink the file while converting, see our guide to compressing an image online without losing quality - format choice and compression work together, and doing both is the fast route to a tiny, perfect image.

Image conversion tools

PNG to JPG

Image Tools

Convert PNG images to JPG format. Useful for reducing file size and improving compatibility.

JPG to PNG

Image Tools

Convert JPG images to PNG format. Preserve quality and add transparency support.

HEIC to JPG

Image Tools

Convert HEIC or HEIF images to JPG format for broad compatibility across devices and apps.

WEBP Converter

Image Tools

Convert WEBP images to PNG or JPG format. Make WEBP images compatible with older browsers and tools.

Conversion tools compared

Feature	PNG to JPG	JPG to PNG	Image to WEBP	HEIC to JPG
Tool	PNG to JPG	JPG to PNG	Image to WEBP	HEIC to JPG
Category	Image Tools	Image Tools	Image Tools	Image Tools
What it does	Convert PNG images to JPG format. Useful for reducing file size and improving compatibility.	Convert JPG images to PNG format. Preserve quality and add transparency support.	Convert PNG, JPG, and other image formats to WEBP. WEBP provides superior compression for smaller file sizes.	Convert HEIC or HEIF images to JPG format for broad compatibility across devices and apps.
Best for	png to jpg	jpg to png	image to webp	heic to jpg
Popular	No	No	No	No