Quick Answer
The main image formats are JPG for photos, PNG for graphics and transparency, WebP for smaller modern web images, GIF for simple animation, and SVG for scalable vector logos. HEIC saves space on iPhones. Choose JPG or WebP for photographs, PNG or SVG for sharp graphics, and always match the format to how the image will be used.
Use JPG for photos you need to work everywhere, PNG for graphics and transparency, WebP for the smallest files on your own website, and HEIC only for storing photos on Apple devices. Each of the four main image formats is best at something different (MDN Web Docs), and choosing the wrong one means files that are too big, images that will not open, or lost quality. This guide compares all four across quality, file size, transparency, and browser support (W3C), so you always know which to reach for. Here is the complete breakdown.
The Four Formats at a Glance
Before the detail, here is how the four formats compare on the things that matter most.
| Format | Compression | Transparency | File size | Support |
|---|---|---|---|---|
| JPG | Lossy | No | Small | Universal |
| PNG | Lossless | Yes | Large | Universal |
| WebP | Both | Yes | Smallest | Modern browsers |
| HEIC | Lossy | Yes | Very small | Mainly Apple |
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When Should You Use JPG?
You should use JPG for photographs and any image where a small file size and working everywhere matter more than pixel-perfect detail. JPG uses lossy compression, which throws away data your eyes barely notice to produce small files, and it is supported by every device, browser, and app ever made.
That combination makes JPG the safe default for photos on websites, in email, and for general sharing. Social platforms have their own rules on top of format, which our Instagram image size guide sets out in full. Its weaknesses are that it cannot store transparency and that repeated saving slowly degrades quality. For logos, text, or anything needing a transparent background, choose a different format.
When Should You Use PNG or WebP?
These two formats cover the jobs JPG cannot do well: crisp graphics and maximum web efficiency.
PNG for graphics and transparency
Use PNG for logos, icons, screenshots, and any image with text, sharp lines, or a transparent background. PNG is lossless, so it keeps every pixel exactly, which is why edges and text stay crisp. The cost is a larger file, so PNG is the wrong choice for photographs, where it produces files many times bigger than JPG. If you have a photo saved as PNG, converting it with a free PNG to JPG converter can shrink it dramatically.
WebP for the smallest web files
Use WebP on your own website when you want the smallest possible files. It produces images 25 to 35% smaller than JPG at the same quality, supports both lossy and lossless modes, and can do transparency like PNG. Every modern browser supports it. The catch is that some older or offline software still cannot open WebP, so for a file you send to others a free WebP to JPG converter keeps things universal.
A simple rule covers most needs: JPG for photos, PNG for graphics and transparency, and WebP when you control the website and want maximum speed.
What About HEIC?
HEIC is the format your iPhone uses by default, and it is superb for storage, packing high quality into files about half the size of JPG. It also supports transparency and depth data. For keeping thousands of photos on your phone, it is excellent.
The problem is compatibility. Outside Apple devices, HEIC support is patchy, and many websites, Windows programs, and older devices cannot open it. So HEIC is best treated as a storage format, not a sharing one. When you need to use an iPhone photo elsewhere, a free HEIC to JPG converter turns it into a file that works anywhere.
🔄 Convert HEIC to JPG Free →Which Format Has the Best Support?
Compatibility often decides the choice, so it is worth being clear on where each format works.
- JPG and PNG: Essentially universal. They open on every browser, device, and app, which is why they remain the safe defaults.
- WebP: Supported by all modern browsers, but not every offline program, so it is ideal for websites and less ideal for files you hand to others.
- HEIC: The weakest support, working mainly inside the Apple ecosystem and usually needing conversion for anything else.
How to Choose Every Time
You never have to guess if you match the format to the job. Photos that need to work everywhere: JPG. Graphics, logos, or transparency: PNG. Photos on a website you control and want fast: WebP. Photos stored on your iPhone: HEIC, converted to JPG when you share them. Whenever you have the wrong format for a task, a free converter turns it into the right one in seconds, all in your browser with nothing uploaded. Documents raise the same format questions, and if you work with PDFs too, IWantFreePDFTools.com offers the same kind of free, in-browser conversion.
🖼️ Try a Free Format Converter →Frequently Asked Questions
When should you use JPG?
Use JPG for photographs and any image where small file size and universal compatibility matter more than perfect detail. JPG uses lossy compression, so files are small, and every device, browser, and app supports it. It is the safe default for photos on websites, email, and sharing. Avoid JPG for logos, text, or images needing transparency.
When should you use PNG?
Use PNG for graphics, logos, icons, screenshots, and any image that needs a transparent background or crisp text and lines. PNG is lossless, so it preserves every pixel exactly, which keeps edges sharp. The tradeoff is larger files, so PNG is a poor choice for photographs, where JPG or WebP is far smaller.
Is WebP better than JPG and PNG?
WebP is technically better for the web because it produces files 25 to 35% smaller than JPG and supports both lossy and lossless modes plus transparency. All modern browsers support it. The main limitation is that some older software and offline tools still do not, so JPG and PNG remain safer for maximum compatibility.
Which image format has the best browser support?
JPG and PNG have essentially universal support across every browser, device, and application, which is why they remain the safe default choices. WebP is now supported by all modern browsers but not every offline program. HEIC has the weakest support, working mainly within the Apple ecosystem and often needing conversion elsewhere.