JPEG (Joint Photographic Experts Group) has been the dominant format for photographs since the 1990s, and despite the rise of newer formats, it remains the single most widely used image format in the world in 2026. The reason comes down to one thing: it's exceptionally good at compressing photographs and complex, color-rich images to small file sizes without making the degradation immediately obvious at normal viewing distances.

JPEG uses lossy compression, which means every time you save a JPEG, some image data is permanently discarded. The algorithm is designed around human visual perception — it discards fine color detail that the eye is less sensitive to while preserving the brightness information we notice most. At a quality setting of 70–85%, a JPEG photograph is typically one-fifth to one-tenth the size of an uncompressed version, with quality loss that most viewers wouldn't notice unless they were looking for it.

Where JPEG genuinely struggles is with images that contain sharp edges, flat colour blocks, text, or line art. The compression algorithm creates visible artifacts — blocky distortion around sharp contrasts — that look fine in a busy photo but become very obvious in a logo, a screenshot with text, or a graphic with solid colour areas. For those use cases, PNG is almost always the better choice.

PNG (Portable Network Graphics) was designed as a direct improvement on the older GIF format, and it became the go-to choice for web graphics, logos, icons, and any image where quality cannot be compromised. The defining characteristic of PNG is its lossless compression — the image is compressed to reduce file size, but no data is thrown away in the process. When you open and resave a PNG, it's pixel-perfect every single time. This makes PNG the correct choice when you're working with source files, design assets, or anything that will be edited multiple times before reaching its final state.

PNG's other critical advantage is alpha channel transparency. Unlike JPEG, which can only have a solid background, PNG supports full 8-bit transparency — meaning each pixel can be anywhere from fully opaque to completely transparent, with 256 levels of semi-transparency in between. This is what makes PNG the standard format for logos, app icons, stickers, and any graphic that needs to sit cleanly on top of different background colours without a white or coloured bounding box around it.

The trade-off is file size. For photographs, PNG files are typically three to ten times larger than an equivalent JPEG at a comparable visual quality level. This makes PNG a poor choice for photographic content on the web where bandwidth and page load speed matter. The lossless nature of PNG compression simply can't match JPEG's ability to squeeze photographic data efficiently. Use PNG for graphics, use JPEG for photos — that's the most practical rule of thumb.

WebP was developed by Google and released in 2010, but it's taken until the early 2020s to achieve the browser support needed for confident widespread adoption. As of 2026, WebP is supported by every major browser — Chrome, Firefox, Safari, Edge, and virtually all mobile browsers — making it the practical modern standard for web image delivery. The reason it matters is straightforward: WebP consistently produces smaller files than both JPEG and PNG at equivalent visual quality levels.

The compression gains are substantial. WebP lossy images are typically 25–35% smaller than JPEG at the same perceptual quality. WebP lossless images are typically 25–35% smaller than PNG. That might not sound dramatic in isolation, but across a website with hundreds of images, it translates into meaningfully faster page loads, lower bandwidth costs, and improved Core Web Vitals scores — which directly affects search engine rankings. WebP also supports full alpha transparency (like PNG) and animation (like GIF), making it a genuine all-rounder in a way JPEG and PNG individually are not.

AVIF (AV1 Image File Format) is the newest format in widespread use, derived from the AV1 video codec developed by the Alliance for Open Media. It represents the current state of the art in image compression — AVIF images are typically 50% smaller than JPEG and 30–40% smaller than WebP at comparable visual quality. For complex photographic content, the compression efficiency is remarkable, particularly at lower quality settings where JPEG shows obvious blocking artifacts but AVIF maintains smooth, natural-looking detail.

The catch in 2026 is that AVIF's browser and tool support, while growing, isn't yet as universal as WebP. Chrome, Firefox, and modern Edge all support it. Safari added AVIF support but implementation has been inconsistent across versions. Encoding AVIF files is also significantly slower than JPEG or WebP, which matters when you're processing images at scale. For most web projects in 2026, AVIF is worth using — particularly for hero images and large photographic content — but it's wise to provide a WebP or JPEG fallback for legacy compatibility.

GIF (Graphics Interchange Format) is old — it dates back to 1987 — and by nearly every technical measure it has been superseded. GIF is limited to a palette of 256 colours, which makes it genuinely terrible for photographs and any image with rich colour gradients. The file sizes for animated GIFs are notoriously large compared to what modern formats can achieve for equivalent content. And yet GIF refuses to die, primarily because of its one remaining unique advantage in certain contexts: it's the most universally supported animated image format across every platform, email client, and messaging app in existence.

For static images, there is no use case in 2026 where GIF is the right choice. PNG does everything GIF does for static content, better. For animations, WebP and AVIF produce vastly smaller files. But the cultural momentum of GIFs — particularly in social media reactions, messaging apps, and meme culture — means GIF isn't going anywhere for a while. If you need an animation that will work in Gmail, Outlook, iMessage, WhatsApp, and every social platform simultaneously without any compatibility questions, GIF is still the safe choice for animation today. Just know that you're paying a significant file size penalty for that compatibility guarantee.

SVG (Scalable Vector Graphics) is fundamentally different from every other format in this guide. While JPEG, PNG, WebP, AVIF, and GIF are all raster formats — meaning they store images as a grid of coloured pixels — SVG is a vector format that stores images as mathematical descriptions of shapes, paths, and colours. The practical result of this difference is significant: an SVG image can be scaled to any size — from a tiny 16×16 favicon to a massive 4000×4000 banner — without any loss of quality or increase in file size. It's always perfectly sharp at any resolution.

SVG files are also technically just text files containing XML code, which means they're searchable, can be directly edited in a text editor, can be animated with CSS, and can respond dynamically to user interactions through JavaScript. For web logos, icons, infographics, charts, and interface illustrations, SVG is the correct format in almost every case. The limitation is equally clear: SVG cannot represent photographs or complex photographic imagery — it's suited for shapes, lines, and flat design elements, not natural scenes.

TIFF (Tagged Image File Format) exists at the opposite end of the size-versus-quality trade-off from JPEG. Where JPEG aggressively discards data to minimize file size, TIFF stores images in full, lossless detail — preserving every pixel exactly as captured or created. The result is files that are enormous by comparison (a single high-resolution TIFF from a professional camera can easily exceed 50–100MB) but contain every scrap of image information without exception.

TIFF is the standard format in professional photography, print production, medical imaging, and archival work — any context where absolute image fidelity is non-negotiable and file size is a secondary concern. Photographers shoot in RAW and export to TIFF for retouching. Print shops require TIFF files for large-format printing at 300 DPI or above. Museums and archives use TIFF for digitizing historical materials. For anything going to the web, TIFF is completely wrong — the file sizes are prohibitive and no browser renders TIFF files natively.