ToolChop

May 2026

JPG vs PNG vs WebP vs AVIF vs HEIC: The Complete Image Format Guide

Walk into any project that involves images and you will immediately face a choice you might not have expected: which format should this image be in? The answer matters more than most people realise. Pick the wrong format and you might be serving a 3 MB file when 300 KB would look identical. Or you might be using JPG for a logo and wondering why the edges look blurry, when PNG would be perfect. Or you might be sending HEIC files to someone on Windows who cannot open them.

Each image format was designed for a specific purpose, with specific trade-offs between file size, quality, compatibility, and capabilities. This guide covers the six formats you are most likely to encounter — JPG, PNG, WebP, AVIF, HEIC, and GIF — with clear, honest advice on what each is good for and when to use it.

JPG (JPEG)

JPG is the world's most widely used image format for photographs. Developed in the early 1990s, it achieves small file sizes by using lossy compression — the encoder analyses the image and permanently discards visual data that is unlikely to be noticed by a human viewer. At a quality setting of 80–85%, a typical photo will be 60–70% smaller than an uncompressed version with no perceptible quality difference on a standard screen.

JPG does not support transparency. If your image has areas that need to be see-through, transparent areas will be filled with white (or whatever background colour you specify). JPG is 8-bit, which means it stores colours using 256 shades per channel — sufficient for most photography but limiting compared to formats that support 16-bit colour. JPG also has no support for animation.

Use JPG for: photographs, product images, social media photos, background images, any photo that does not require transparency or animation. JPG is the safest default for sharing photos with anyone, uploading to any website, and ensuring every recipient can open the file.

If you need to convert images to JPG, ToolChop's image to JPG converter handles PNG, WebP, HEIC, AVIF, and most other formats as input.

PNG

PNG (Portable Network Graphics) was designed in the mid-1990s as an open, patent-free alternative to GIF, and it has become the standard format for graphics, screenshots, and images that require transparency. PNG uses lossless compression, which means every pixel is stored exactly — you never lose quality when saving or re-saving a PNG.

The transparency support in PNG is far more sophisticated than GIF. While GIF can only mark pixels as fully transparent or fully opaque, PNG supports full alpha channel transparency: each pixel can be any degree of transparency from 0% to 100%. This is what makes PNG the right choice for logos, icons, and interface elements that need to sit on top of backgrounds of any colour.

PNG's weakness is file size for photographs. Because lossless compression stores every pixel, photos in PNG format are typically several times larger than the same photo as a JPG. A 3 MB JPG photo might be 15 MB as a PNG. This makes PNG a poor choice for photography in most web contexts.

Use PNG for: logos, icons, screenshots, interface graphics, illustrations, any image that requires a transparent background, and any image that will be edited further and needs to preserve every pixel exactly.

WebP

WebP is a format developed by Google and released in 2010, designed specifically for the web. It supports both lossy and lossless compression, transparency, and animation — making it a single format that can replace JPG, PNG, and GIF in many situations.

The headline benefit of WebP is file size. Google's own studies found that WebP lossy images are about 25–34% smaller than comparable JPG images at equivalent quality, and WebP lossless images are about 26% smaller than PNG. For a site with many images, switching to WebP can meaningfully reduce bandwidth usage and improve load times.

Browser support for WebP is now excellent: Chrome, Firefox, Safari (since 2020), Edge, and all major mobile browsers support it. The main gap is older browsers — Internet Explorer does not support WebP, though IE is essentially defunct. If you need to support a very old browser base, serve WebP with a JPG fallback using the HTML <picture> element.

Use WebP for: any web image where you want smaller files than JPG or PNG. It is particularly valuable for image-heavy sites, e-commerce product photos, and any context where Core Web Vitals scores matter. The image to WebP converter can convert JPG, PNG, and other formats to WebP in your browser.

AVIF

AVIF (AV1 Image File Format) is the newest mainstream image format, derived from the AV1 video codec developed by the Alliance for Open Media. It achieves even better compression than WebP — typically 20–50% smaller than WebP at comparable quality — while also supporting HDR (high dynamic range) colour, wide colour gamut, 10-bit and 12-bit colour depth, and both lossy and lossless modes.

The catch is that AVIF has high encoding complexity. Encoding an AVIF image is significantly slower than encoding JPG or WebP, which can be a problem in build pipelines that process large numbers of images. Decoding is fast, however, so users view AVIF images without delay.

Browser support has improved significantly. Chrome, Firefox, and Opera support AVIF. Safari added support in version 16 (2022). Edge added support in 2021. The remaining gaps are older Safari versions and some mobile browsers. As with WebP, a<picture> fallback covers the gaps.

Use AVIF for: web images where maximum compression is the priority and you can afford the slower encoding time. It is an excellent choice for hero images, large product photos, and any image that will be served to millions of page views where the bandwidth savings add up. For casual use or where encoding speed matters, WebP is usually the more practical choice today.

HEIC

HEIC (High Efficiency Image Container) is Apple's format for iPhone photos, introduced as the default camera format in iOS 11. It is based on the HEIF standard and uses HEVC (H.265) compression, which allows it to store photos at roughly half the file size of JPG with equal or better visual quality. A typical iPhone photo that would be 4–6 MB as a JPG is 2–3 MB as HEIC.

HEIC supports 16-bit colour, HDR, transparency, Live Photos, image sequences, and depth data from Portrait mode shots. It is a technically impressive format that does things JPG simply cannot. Within the Apple ecosystem — iPhone, iPad, Mac, iCloud — it works seamlessly.

Outside the Apple ecosystem, HEIC compatibility remains inconsistent. Windows 10 and 11 can open HEIC files with an optional (and sometimes paid) codec installed. Most Android devices cannot open HEIC natively. Many web platforms, online forms, and third-party applications do not accept HEIC files. This means that HEIC photos shared outside of Apple's ecosystem often need to be converted.

Use HEIC for: keeping photos on your iPhone and in iCloud where storage efficiency matters. Convert to JPG when sharing outside the Apple ecosystem, uploading to web services, or sending to anyone who might not have an Apple device. The HEIC to JPG converter makes this a one-step process.

GIF

GIF (Graphics Interchange Format) is one of the oldest image formats on the internet, dating back to 1987. Its defining feature is animation support — a single GIF file can contain multiple frames played in sequence, creating a looping animation without any video container or JavaScript. This is why GIF became the format of choice for short animated clips, reaction images, and memes.

GIF uses lossless compression but is limited to a palette of 256 colours per frame. This makes it excellent for simple graphics with flat colours but terrible for photographs, which need thousands of colours to look natural. A photographic GIF will look obviously degraded, with visible colour banding and dithering artefacts.

For animation, GIF has a significant file size problem. Animated GIFs can be very large compared to the equivalent content in a video format like MP4. Many platforms (including Twitter, Tenor, and Giphy) automatically convert GIF uploads to short MP4 videos for delivery because the video format is far more efficient. For new work that requires animation, WebP and AVIF both support animation with better compression than GIF, though browser support for animated WebP and AVIF is not yet universal.

Use GIF for: simple two-colour or few-colour animations where compatibility is paramount and the content is genuinely best represented as a looping animation. Avoid GIF for photographs, anything colour-critical, or where file size is a concern.

Quick Reference: Which Format Should I Use?

Use this decision guide for the most common scenarios:

Frequently Asked Questions

Which image format has the best quality?

For photographic quality at small file sizes, AVIF and HEIC lead, followed by WebP. For lossless preservation of every pixel, PNG and lossless WebP are equivalent. JPG remains excellent at high quality settings (90%+) but cannot match the newer formats at small file sizes. GIF is the weakest for photographic content due to its 256-colour palette limit.

Which format is best for printing?

For printing, use the highest-quality source file you have — ideally an uncompressed TIFF, PNG, or JPG at 95%+ quality with a resolution of at least 300 DPI at the intended print size. Most professional print services accept JPG and TIFF. PNG is also widely accepted. WebP, AVIF, and HEIC are not commonly accepted by print labs.

Can I convert between any of these formats?

Yes, you can convert between any of these formats. Converting from a high-quality source to any target format is straightforward. The important thing to remember is that converting from one lossy format to another (for example, JPG to WebP) involves a generation of quality loss, so always convert from your highest-quality source rather than from an already-compressed file. ToolChop offers converters for JPG to PNG, PNG to JPG, WebP to JPG, and HEIC to JPG.

Does the format affect how fast my website loads?

Yes, significantly. Format and compression settings are among the most impactful factors in image file size, which directly affects load times. Switching a site from JPG to WebP at equivalent quality typically reduces image payload by 25–35%. Using AVIF can reduce it further. Google's PageSpeed Insights specifically flags opportunities to serve images in next-gen formats like WebP and AVIF.

Is PNG or JPG better for social media?

For photographic posts, JPG is usually better — social platforms re-compress images on upload, and their compression algorithms are tuned for JPG input. For images with text, sharp graphics, or logos, PNG preserves detail better through the re-compression step. Most platforms accept both; the differences in final quality after their processing are small either way.