How to Choose the Right Image Format: JPG, PNG, WebP & More
Have you ever tried to open a photo on your computer, only to get an error message? Or wondered why the same image looks sharp on one website but blurry on another? Or perhaps your iPhone photos will not open on your Windows PC? The answer to all of these frustrations comes down to one thing - image formats.
This guide explains everything you need to know about image formats in plain, simple language. No jargon, no confusion. By the end, even a 13-year-old will know exactly which format to use and when.
What Is an Image Format - And Why Does It Matter?
Think of image formats like different types of containers. Water, juice and soup are all liquids - but you store them in different containers depending on what they are and how you plan to use them. Image formats work the same way.
Every digital image is made up of millions of tiny coloured dots called pixels. An image format is simply the method used to store all those pixels in a file. Some methods squash the data to make the file smaller. Others keep every single detail perfectly. Some support transparent backgrounds. Others do not.
Every format tries to balance three things: file size, image quality, and compatibility - how widely it is supported across devices and software. The wrong format in the wrong situation causes real problems. The right format makes everything easier.
JPG - The Old Faithful
JPG (sometimes written JPEG) was invented in 1992 and remains the most common photo format on the internet. There is a very good reason for that - it is excellent at making photo files small without making them look terrible.
JPG works by quietly throwing away tiny details that your eye barely notices - the slight variation in colour between two adjacent pixels in a blue sky, for example. The result is a file that can be ten times smaller than the original while still looking beautiful.
Best for: photographs, social media posts, email attachments, anything where file size matters.
Avoid when: you need a transparent background, or when you plan to edit the image repeatedly. Every time you save a JPG, it loses a little more quality - like making a photocopy of a photocopy. Eventually the damage becomes visible.
JPG does not support transparency, so if you place a JPG logo on a coloured background, you will see an ugly white rectangle around it.
PNG - The Transparency King
PNG was created in 1995 specifically to fix the problems JPG could not solve. Unlike JPG, PNG is lossless - it saves every single pixel perfectly, with zero quality loss, no matter how many times you save it.
PNG's biggest superpower is transparency. A PNG image can have areas that are completely see-through, which is why it is the favourite format of designers, developers and anyone who works with logos.
Best for: logos, icons, screenshots, graphics containing text, and any image that needs a transparent background. If you have ever wondered why your company logo looks jagged on a coloured PowerPoint slide, it is because someone saved it as a JPG instead of PNG.
Avoid when: file size matters. A PNG photograph is typically three to five times larger than the same image saved as a JPG. For photos on websites, PNG is simply too heavy.
The difference between JPG and PNG comes down to this - JPG for photos, PNG for graphics.
WebP - The Modern All-Rounder
WebP was created by Google in 2010 with one ambitious goal - replace both JPG and PNG with something better. It largely succeeded.
WebP can be up to 30% smaller than JPG at the same visual quality. It also supports transparency, just like PNG. It handles both photographs and graphics beautifully. It is the best image format for website use in 2026, which is why Google, Facebook, YouTube and most major websites switched to it years ago.
Best for: websites, online stores, web developers, any situation where fast loading matters.
Avoid when: sharing files with someone using very old software that was made before 2018, as some legacy programmes cannot open WebP files.
If you are building or running a website, converting your images to WebP is one of the easiest ways to make it load faster - and Google rewards fast-loading websites with higher search rankings.
HEIC - The iPhone Format Nobody Asked For
In 2017, Apple introduced HEIC as the default format for iPhone photos. In fairness, it is genuinely impressive - a HEIC photo is roughly half the size of the same photo saved as JPG, while actually looking better. Apple was trying to save storage space on your phone.
The problem? Windows cannot open HEIC files natively. Send an iPhone photo to a Windows user and there is a good chance they will stare at an error message. This is why converting HEIC to JPG free has become one of the most searched topics on the internet in recent years.
Best for: staying on your iPhone or iPad, where everything works perfectly.
Avoid when: sharing photos with anyone not using an Apple device, uploading to websites, or sending to clients and colleagues.
If you find yourself constantly asking "why is my iPhone photo HEIC and how do I open it on Windows" - you are far from alone. Millions of people face this every day.
AVIF - The New Champion
AVIF is the newest major image format and it is genuinely exciting. It offers even better compression than WebP - meaning even smaller files at even higher quality. It also supports transparency and handles both photos and graphics beautifully.
Best for: future-proofing your website images, developers who want the absolute best performance.
The catch - while Chrome, Firefox and Safari all support AVIF, some older browsers and software still do not. It is the format of the future, but WebP is still the safer choice for broad compatibility today.
If you want to convert image without losing quality while also keeping file sizes small, AVIF is worth trying.
BMP - The Dinosaur
BMP is Microsoft's original image format from the 1980s. It stores every single pixel with zero compression whatsoever - which means perfect quality but absolutely enormous file sizes. A BMP photograph can be ten to twenty times larger than the same image in JPG.
Best for: almost nothing in 2026. You may still encounter BMP in Windows Paint or in some legacy industrial and medical systems.
Avoid when: literally any modern use case. There is almost never a good reason to use BMP today.
TIFF - The Professional's Choice
TIFF is the format that professional photographers, printers and publishers have trusted for decades. Like PNG, it is lossless - but it also supports features that PNG does not, such as multiple layers and extremely high colour depth.
Best for: professional printing, medical imaging, archiving your original photographs, and any workflow where absolute quality is non-negotiable. Print shops often specifically request TIFF files.
Avoid when: anything web-related. Web browsers cannot display TIFF files, and they are far too large for online use.
GIF - The Animation Legend
GIF has been around since 1987 and has one unique superpower - it supports simple animation. It is also the source of one of the internet's greatest debates: is it pronounced "GIF" or "JIF"?
The catch is that GIF is limited to just 256 colours, which makes it terrible for photographs but fine for simple graphics and - most famously - short looping animations and memes.
Best for: simple animations, reaction GIFs, basic graphics with few colours.
Avoid when: you need realistic colour, photographic quality, or small file sizes. For animation with better quality, modern alternatives like WebP and AVIF now support animation too.
Quick Comparison - All Formats at a Glance
| Format | Best For | Transparency | File Size | Lossless |
|---|---|---|---|---|
| JPG | Photos | ❌ | Small | ❌ |
| PNG | Logos, Graphics | ✅ | Large | ✅ |
| WebP | Websites | ✅ | Very Small | Both |
| HEIC | iPhone Photos | ⚠️ rarely used | Very Small | ❌ |
| AVIF | Future Web | ✅ | Smallest | Both |
| BMP | Legacy Only | ❌ | Huge | ✅ |
| TIFF | Print, Archive | ✅ | Very Large | ✅ |
| GIF | Animation | ✅ | Small | ❌ |
So Which Format Should You Use?
Not sure which format to pick? Ask yourself these three questions:
- Am I sharing a photograph? → Use JPG
- Do I need a transparent background? → Use PNG or WebP
- Am I putting images on a website? → Use WebP
- Is my photo stuck in HEIC from my iPhone? → Convert to JPG
- Am I printing professionally? → Use TIFF
- Do I need a simple animation? → Use GIF
The most important thing to remember is this - there is no single best image format for every situation. Each one was created to solve a specific problem. Now that you know what each format does, you will always make the right choice.
Converting Between Formats Today
Now that you know the difference between every major image format, you may find yourself needing to convert from one to another - whether that is turning a PNG into a WebP for a faster website, changing a JPG to PNG to preserve transparency, or simply converting HEIC to JPG free so a file opens on Windows.
The good news is that this no longer requires installing software or being technical at all. A number of free online tools can convert almost any image format to another in just a few seconds, directly in your browser, with no account required.
If you found this guide useful, why not put what you just learned to work? Fix Shots converts between every format covered here - free, instant, and without storing a single one of your images. Bookmark it for the next time you need a quick, reliable conversion.