The Complete Guide to Image File Formats: PNG, JPG, WebP, HEIC, and SVG Explained

What Makes an Image Format Different

Every format makes two choices: how it stores the picture, and how much detail it's willing to throw away to save space. Raster formats, like PNG, JPG, WebP, and HEIC, store a grid of colored pixels. Vector formats, like SVG, store instructions, such as draw a circle here and fill this path with that color. Those instructions turn into pixels only when the image is shown.

Within raster formats, compression is either lossless or lossy. Lossless means every pixel comes back exactly as saved. Lossy means some detail is gone for good, in exchange for a much smaller file. Once you know where a format sits on those two questions, its strengths and weaknesses make sense.

PNG: The Lossless Standard

PNG (Portable Network Graphics) came out in the mid-1990s as a free replacement for GIF. It has lasted because it does one thing very well: lossless compression. The pixels you save are the pixels you get back. That makes PNG the default for screenshots, logos, charts, and anything with sharp edges, flat colors, or readable text. It also supports a full transparency channel, so a logo can sit cleanly on any background.

The cost is size. PNG can't discard detail, so a photo saved as PNG can be five to ten times bigger than the same photo as JPG, with no visible gain. If a photo ended up as a PNG, our PNG to JPG converter shrinks it in seconds.

JPG (JPEG): The Photo Format

JPEG dates to 1992 and was designed for photographs. It looks at the picture in small blocks and drops the color detail your eye is least likely to miss. That works well on gradients, skin tones, and natural light. It works badly on sharp edges and text, which is why a screenshot saved as JPG shows fuzzy halos around letters. JPG also has no transparency. Any see-through area is filled with a solid color, usually white.

Its big advantage is that the compression is adjustable. A photo saved at 60 percent quality can be a fraction of the size, with a difference most people can't spot. If a JPG from your phone is still bigger than you need, our Image Compressor lets you choose how much size to save before the quality loss shows.

WebP: The Modern All-Rounder

Google introduced WebP in 2010 because the web needed one format that did the jobs of both PNG and JPG. WebP handles lossy and lossless compression, full transparency, and even animation. In Google's own comparisons, lossy WebP is roughly 25 to 34 percent smaller than JPG at similar quality, and smaller than PNG too. That's why many big websites serve WebP by default.

Browser support is now excellent. Plenty of software outside the browser still doesn't read it, from older design tools to some upload forms. If you've downloaded a WebP and need something more widely accepted, our WebP to PNG and WebP to JPG converters do it in your browser.

HEIC: Apple's Photo Format

HEIC (High Efficiency Image Container) became the iPhone's default photo format with iOS 11. It uses techniques borrowed from modern video codecs, and it stores a photo at about half the size of a similar JPG with no visible loss. For a phone that takes photos all day and runs low on space, that matters.

The catch is compatibility. Outside Apple's own apps, HEIC support is patchy. A file that opens instantly on an iPhone may refuse to open on Windows, on Android, or in a website's upload form. Our HEIC to JPG and HEIC to PNG converters turn an iPhone photo into a format every device and site understands.

SVG: Vector Graphics

SVG (Scalable Vector Graphics) is the odd one out, because it isn't a raster format. An SVG is plain text that describes shapes, paths, and colors. It can be scaled to billboard size or down to a favicon without losing any sharpness. That makes it ideal for logos, icons, and illustrations, and a poor fit for photos, which don't reduce to simple shapes.

If a logo only exists as a PNG or JPG, our PNG to SVG tool can trace it into a vector. To go the other way and turn a vector file into a normal picture, our SVG Converter exports a PNG or JPG.

GIF, AVIF, BMP, and TIFF

Four more formats turn up often enough to know:

• GIF is limited to 256 colors and is known for short looping animations. As a still picture, it's best for simple graphics. Our GIF to JPG tool saves the first frame as a regular picture.
• AVIF is a newer format that can beat WebP on size. Some software still can't open it, and AVIF to JPG solves that.
• BMP is an old Windows format with almost no compression, so files are huge. BMP to JPG usually makes them far smaller.
• TIFF is a high-quality format for scans and print work. Most browsers can't show it, so TIFF to JPG makes a shareable copy.

Why Some Images Look Banded

Compression isn't the only thing that shapes how an image looks. Color depth matters too. A true-color image stores millions of possible shades for each pixel, enough to draw a smooth sunset with no visible steps. Some formats and export settings use a small palette instead, often 256 colors or fewer. That makes a smaller file for simple graphics. On a gradient, it causes banding: faint stripes where a smooth change got rounded into a few steps.

It explains why an icon or a gradient background can look worse after conversion even with no lossy compression involved. If you see banding after saving, export at full color depth, which PNG, JPG, and WebP all support.

Format Comparison at a Glance

Which Format Should You Use?

A simple rule covers most cases. Use PNG for sharp edges and transparency. Use JPG or WebP for photos, and WebP when you control the website and want the smallest file. Use SVG for anything shaped like a logo or icon that has to scale. Leave HEIC alone on your iPhone, but convert it when you share outside Apple's world. Not sure what a platform expects? Our Image Converter switches between PNG, JPG, and WebP in one place, so you don't need a different tool for each pair.

Matching the Format to the Situation

A few situations are worth spelling out.

• Website hero images and product photos: WebP first, since load speed affects both visitors and search results. Keep JPG as a fallback.
• App icons and interface graphics: PNG. These are flat, sharp images that lossless compression suits, and they often need transparency.
• Email attachments: JPG for photos. Every email app on every device has opened it for decades.
• An original you might edit again: keep it lossless. Each time a JPG is edited and re-saved, it loses a little more detail. Store originals as PNG or in their native format.
• A logo used at very different sizes: keep an SVG as the master, and export PNG copies for places that don't accept vector files.

Frequently Asked Questions