Confused by JPG, PNG, WebP, HEIC and AVIF? Learn what each format does, when to use it, and how to convert images free in your browser.
You take a photo on your iPhone, send it to a Windows laptop, and it won’t open. You upload a PNG to your website and the page loads slowly. You download an image from the web and your editor says “unsupported file type.”
All of these problems come from the same place: image formats. Each one is built for a different job, and picking the wrong one costs you quality, speed, or compatibility.
This guide explains the five most common formats in plain language, tells you when to use each, and shows how to convert between them for free.
Quick Comparison
| Format | Compression | Transparency | Best For | Support |
|---|---|---|---|---|
| JPG | Lossy | No | Photos, sharing | Everywhere |
| PNG | Lossless | Yes | Logos, screenshots, graphics | Everywhere |
| WebP | Lossy and lossless | Yes | Websites | All modern browsers |
| HEIC | Lossy | Yes | iPhone photo storage | Apple devices, limited elsewhere |
| AVIF | Lossy and lossless | Yes | Smallest web images | Modern browsers, growing |
1. JPG (JPEG): The Universal Standard
JPG has been the default photo format for decades. It uses lossy compression, which means it throws away some detail to make the file smaller. At sensible quality settings you won’t notice the difference.
Use JPG when:
- You’re sharing photos on WhatsApp, email, or social media
- You need a file that opens on any device or app
- You don’t need a transparent background
Avoid JPG when: you have text, sharp lines, or logos. Compression creates fuzzy edges around them.
2. PNG: Sharp and Transparent
PNG uses lossless compression, so nothing is thrown away. It also supports transparent backgrounds, which is why almost every logo you see online is a PNG.
Use PNG when:
- You’re working with logos, icons, or illustrations
- You’re taking screenshots with text
- You need a transparent background
Avoid PNG when: the image is a large photo. File sizes get big quickly and slow your website down.
Need to switch? Convert JPG to PNG, or PNG to JPG to get a smaller file.
3. WebP: Built for the Web
Developed by Google, WebP gives you smaller files than JPG and PNG at similar visual quality. It supports transparency too, so it can replace both formats on a website.
Use WebP when:
- You run a website or blog and care about page speed
- You want smaller images without visible quality loss
The catch: some older apps and editing software don’t accept WebP. If you download a WebP image and can’t use it, convert it with WebP to JPG or WebP to PNG. To go the other way and shrink your own site images, use JPG to WebP.
4. HEIC: The iPhone Format
Since iOS 11, iPhones have saved photos as HEIC by default. It stores photos at roughly half the size of a comparable JPG, which saves storage space.
The problem: Windows, many websites, and a lot of apps can’t open HEIC files, so uploads fail or the file looks blank.
The fix: convert it. Use HEIC to JPG to turn iPhone photos into JPG, PNG, or WebP in seconds. Alternatively, on your iPhone go to Settings, then Camera, then Formats, and choose “Most Compatible” so new photos are saved as JPG.
5. AVIF: The New Compression Champion
AVIF is the newest format here. It can produce even smaller files than WebP at the same quality, and it handles transparency and rich colors well.
Use AVIF when:
- You want the smallest possible web images
- Your audience uses up-to-date browsers
The catch: support in editing software and older devices is still catching up. If an AVIF file won’t open, AVIF to JPG solves it instantly.
Which Format Should You Pick?
- Sharing a photo with someone: JPG
- Logo or graphic with transparency: PNG
- Images for your website: WebP (or AVIF if you want to go further)
- Storing iPhone photos: HEIC, converted to JPG when you share
- Print or editing: PNG or the original file
Don’t Forget File Size
Choosing the right format is half the job. The other half is making sure the file isn’t bigger than it needs to be. Large images slow down pages, fail email attachment limits, and get rejected by upload forms with size caps.
- Image Compressor shrinks JPG, PNG, and WebP files
- Image Resizer sets exact dimensions or a target file size
Privacy: A Detail Most Converters Ignore
Many online converters upload your photos to their servers. If the image is personal, like an ID, a family photo, or a document scan, that’s a risk.
Rumeq’s tools run directly in your browser, so your files stay on your device. Photos also carry hidden data such as GPS location and camera details, and you can strip it with the Image Metadata Remover before sharing.
Frequently Asked Questions
What is the best image format for websites?
WebP is the best all-round choice today. It gives smaller files than JPG and PNG and works in all modern browsers.
Is PNG better than JPG?
Not always. PNG is better for graphics and transparency, but JPG gives much smaller files for photos.
Why can’t I open HEIC files on Windows?
HEIC is an Apple-first format and isn’t supported everywhere. Convert it to JPG and it will open anywhere.
Does converting an image reduce quality?
Converting to a lossy format like JPG can slightly reduce quality. Converting to PNG won’t add quality back, but it won’t lose any more.
Are Rumeq’s converters free?
Yes. No sign-up, no limits, and everything runs in your browser.
Conclusion
There’s no single “best” format, only the best one for the job. Use JPG for sharing, PNG for graphics, WebP for websites, and convert HEIC or AVIF when something won’t open.
Ready to try it? Browse all of Rumeq’s free image tools and fix your next image problem in seconds.