Image Formats Explained: A Complete Guide to JPG, PNG, WebP, HEIC, AVIF, SVG, TIFF, and BMP

There are dozens of image formats out there, but only a handful matter for most people. Whether you are building a website, editing photos, or just trying to share an image that actually opens on the other person's device, understanding the differences between formats saves time and frustration.

Here is a practical breakdown of the 8 image formats you are most likely to encounter, when to use each one, and how they compare.

JPG (JPEG)

JPG is the universal standard for photographs. Introduced in 1992, it uses lossy compression -- meaning it discards some image data to achieve smaller file sizes. The trade-off between quality and file size is adjustable (typically on a 1-100 quality scale).

At quality 80-85, most people cannot tell the difference between a JPG and the original. Below 60, compression artifacts (blocky areas, color banding) become noticeable. JPG does not support transparency or animation.

Best for: Photographs, social media images, email attachments, any scenario where universal compatibility matters. JPG works everywhere -- every browser, every device, every app.

PNG

PNG (Portable Network Graphics) uses lossless compression, preserving every pixel exactly. It supports full alpha transparency (partial transparency, not just on/off), making it essential for logos, icons, and graphics that need to sit on top of other content.

The downside is file size. A photograph saved as PNG will be 3-5x larger than the same image as JPG. For screenshots, diagrams, and graphics with sharp text, PNG is unbeatable. For photos, it is overkill.

Best for: Screenshots, logos, icons, graphics with text, any image where transparency or pixel-perfect quality is needed. See our full WebP vs PNG comparison.

WebP

Developed by Google in 2010, WebP supports both lossy and lossless compression, transparency, and animation -- all in one format. WebP files are 25-34% smaller than JPG (lossy) and about 26% smaller than PNG (lossless).

WebP reached universal browser support when Safari added it in version 16 (2022). As of 2026, WebP is supported in every modern browser, making it a safe default for web images.

Best for: Web images of all types. If you are optimizing for page speed, WebP is the safest modern choice with the broadest compatibility.

HEIC

HEIC (High Efficiency Image Container) is Apple's photo format, used by default on iPhones since iOS 11 (2017). It achieves roughly 50% smaller files than JPG at the same visual quality, and supports Live Photos, depth maps, and HDR.

The problem is compatibility. Outside Apple's ecosystem, HEIC support is spotty. Web browsers (except Safari) do not display HEIC. Windows requires an extension. Many image editors do not support it. If you need to share iPhone photos widely, you will need to convert them.

Best for: iPhone photo storage (saves space). Convert to JPG or WebP for sharing and web use. Read our full HEIC explainer.

AVIF

AVIF (AV1 Image File Format) is the newest major format, based on the royalty-free AV1 video codec. It produces the smallest files of any format -- roughly 50% smaller than JPG and 20% smaller than WebP at equivalent quality.

AVIF supports HDR, wide color gamut, transparency, and animation. Browser support has reached about 95% coverage (Chrome, Firefox, Safari 16+, Edge). The main drawback is slow encoding speed -- creating AVIF files takes significantly longer than JPG or WebP.

Best for: Web images where file size is the top priority, HDR content, high-quality photographs. Read our full AVIF explainer.

SVG

SVG (Scalable Vector Graphics) is fundamentally different from the other formats on this list. Instead of storing pixels, SVG stores shapes, paths, and text as XML code. This means SVG images scale to any size without losing quality -- they look sharp on a 4K monitor and a mobile screen alike.

SVG files can be styled with CSS, animated with JavaScript, and embedded directly in HTML. They are typically very small for simple graphics. However, SVG is not suitable for photographs or complex images with millions of colors.

Best for: Icons, logos, illustrations, charts, diagrams, and any graphic that needs to scale cleanly. Not suitable for photographs.

TIFF

TIFF (Tagged Image File Format) is a professional format used in publishing, photography, and scientific imaging. It supports lossless compression (or no compression at all), multiple layers, and extensive metadata. TIFF files can be enormous -- a single high-resolution photograph might be 50-100MB.

TIFF is not supported by web browsers and is not suitable for web use. It is a working format for professionals who need maximum quality and do not care about file size.

Best for: Professional photography workflows, print publishing, archival storage. Convert to JPG, PNG, or WebP for web use.

BMP

BMP (Bitmap) is a legacy Windows format that stores images with little or no compression. A BMP file is essentially a raw pixel dump, which makes files enormous. A 1920x1080 image in 24-bit BMP is about 6MB. The same image as JPG might be 200KB.

BMP has no practical advantage over modern formats. It exists primarily for backward compatibility with very old Windows applications. If you encounter a BMP file, convert it to almost anything else.

Best for: Nothing in 2026. Convert to JPG, PNG, or WebP immediately.

Master Comparison Table

Across all 8 formats: JPG is lossy with no transparency, small files, and 100% browser support -- best for photographs. PNG is lossless with transparency, medium-large files, and 100% browser support -- best for graphics and screenshots. WebP supports both lossy and lossless with transparency and animation, small files, and 97%+ browser support -- best for web images. HEIC is lossy with transparency, very small files, but Safari-only browser support -- best for iPhone photos. AVIF supports both modes with transparency and animation, the smallest files, and 95%+ browser support -- best for web optimization. SVG is vector-based with transparency, tiny files for simple graphics, and 100% browser support -- best for icons and logos. TIFF is lossless with very large files and no browser support -- best for professional and print use. BMP is uncompressed with enormous files and limited browser support -- best for nothing in 2026.

Which Format Should You Use?

Here is a quick decision guide:

The Bottom Line

For most web use in 2026, WebP is the best default format. It is supported everywhere, compresses well in both lossy and lossless modes, and handles transparency. JPG remains the safe universal choice. PNG is essential for lossless quality and transparency. AVIF is the future for maximum compression. Everything else is niche.

No matter which format you need, imageconvert.co converts between all of them directly in your browser. No uploads, no accounts, no privacy concerns.

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