Common Image File Types Explained: A Glossary

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Do you love or hate acronyms? Yes, those delightful word concoctions that tickle or frustrate our linguistic senses. Learning new acronyms is an adventure where each acronym is a tiny puzzle, waiting to be unlocked either out of curiosity or necessity. 

Understanding image file types is important for various reasons, whether you’re sharing pictures on social media, designing a website, or simply organizing your photo collection. Different file types have unique characteristics that affect image quality, size, and compatibility. Here is the alphabet soup of acronyms for image file types. From GIFs to TIFFs, let’s add to your linguistic repertoire. These are the most common image file types and their applications and I’ll try and make it as easy to understand as possible.

Common Image File Types

JPEG (Joint Photographic Experts Group): JPEG is the most widely used image format, ideal for photographs and complex images. It uses compression to reduce file size while maintaining decent quality. JPEG files are commonly used on websites, social media, and digital cameras.

PNG (Portable Network Graphics): PNG files are excellent for graphics with transparent backgrounds or sharp edges, such as logos or illustrations. They support lossless compression, which preserves image quality but results in larger file sizes. PNGs are commonly used in graphic design and web development.

GIF (Graphics Interchange Format): GIFs are image files that can contain short animations or looping sequences. They support transparency and limited colors, making them perfect for simple animations, memes, and social media reactions.

BMP (Bitmap): BMP is a basic and uncompressed image format that stores color data for each individual pixel. It offers high quality but results in large file sizes. BMP files are commonly used in Windows applications or for simple graphics that require lossless quality.

TIFF (Tagged Image File Format): TIFF files are known for their lossless compression and high image quality. They are commonly used in professional photography and print media, where preserving every detail is crucial. TIFF files can handle multiple layers and colour profiles.

SVG (Scalable Vector Graphics): SVG is a vector-based image format that uses mathematical equations to define shapes and lines. It can be scaled to any size without losing quality. SVG files are widely used in web design, logos, and illustrations.

PSD (Photoshop Document): PSD files are created and edited in Adobe Photoshop, preserving all layers, effects, and adjustments. They are mainly used for editing purposes and can be converted to other formats for final use.

What is a Photoshop Document?

A PSD is a file format associated with Adobe Photoshop, a powerful and widely used software for graphic design and image editing. Think of PSD as the native language of Photoshop—it’s the format in which your creative masterpieces are saved, preserving all the layers, effects, and adjustments you have meticulously crafted. 


Once you’re satisfied with your creation, you can export or convert the PSD file to other formats, such as JPEG or PNG, for practical use on websites, social media, or print materials. This allows you to share your artwork with the world, whether it’s a beautifully retouched photograph, an eye-catching logo, or a stunning digital illustration.

HEIC (High Efficiency Image Format): HEIC is a modern image format used in Apple devices. It provides high-quality images with better compression, resulting in smaller file sizes. HEIC files are useful for saving storage space on devices and efficient image sharing.

What is HEIC and why did Apple introduce this?

HEIC is an image file format introduced by Apple that offers improved image compression while maintaining high-quality visuals. It is specifically designed to optimize storage space on Apple devices, such as iPhones and iPads, allowing users to capture and store more photos without sacrificing its original quality, details, colours, and overall visual integrity.


Apple is known for its innovation and user-centric approach and developed HEIC as a successor to traditional image formats like JPEG and utilizes advanced compression algorithms, resulting in significantly smaller file sizes compared to JPEG while preserving image detail and colour accuracy. This efficiency makes allows users to capture and enjoy a multitude of high-quality photos without worrying about running out of storage space.


One of the key advantages of HEIC is its ability to store not only the image but also additional data such as depth information, multiple exposures, and even Live Photos. This additional data enhances the possibilities for editing and post-processing, giving users more flexibility to create stunning visual effects or adjust focus and lighting after the photo is taken.


You should note that while HEIC is primarily associated with Apple devices, its usage is not limited to them. With the growing popularity of this format, support for HEIC has expanded to various platforms and software applications. However, it’s important to note that some older devices or non-Apple platforms may not fully support HEIC out of the box. In such cases, converting HEIC files to more widely supported formats like JPEG or PNG may be necessary.

WebP and what is it?

WebP is a relatively new image format developed by Google specifically for web use. It offers efficient compression and high image quality, resulting in smaller file sizes compared to JPEG and PNG. WebP supports both lossy and lossless compression, allowing flexibility in balancing between file size reduction and image quality.

It is not imperative that you know this but I know that you are curious and have quietly mouthed “What the heck is that?” So, here it is in a nutshell.


Lossy Compression: Imagine you have a big balloon filled with air. To make it smaller, you slowly let out some air. That’s how lossy compression works. It squeezes the data in a file by removing less important or less noticeable details, like deflating the balloon. This helps reduce the file size, but it also means some information is lost. In the case of images, this method removes fine details or subtle color variations. Lossy compression is great when you want to save space, like when sharing photos online, but be aware that each time you compress and decompress the file, you may lose a bit more quality.


Lossless Compression: Now, imagine you have a puzzle that you want to store in a smaller box. Instead of throwing away any puzzle pieces, you find a way to pack them more efficiently. That’s how lossless compression works. It finds patterns and redundancies in the data and encodes them in a smarter way. When you need the puzzle again, you unpack it, and all the pieces are exactly as they were before. In the case of images, lossless compression makes the file size smaller without throwing away any details. This method is great for situations where you need to preserve every little piece of information, like in professional photography or archival storage. Just keep in mind that lossless compression may not make the file size as small as lossy compression, but you won’t lose any image quality in the process.

Back to WebP files, they are particularly beneficial for websites as they help optimize loading times and improve the overall performance of web pages. By using WebP, website owners can reduce the file size of their images without sacrificing visual quality. This format is especially effective for photographs, complex images, and graphics with many colours.

Compatibility with WebP has been steadily increasing, with major web browsers adopting support for this format. However, it’s important to note that not all browsers may fully support WebP, especially older versions or certain mobile browsers. To ensure broader compatibility, it’s recommended to provide fallback options, such as using JPEG or PNG versions of the images for browsers that do not support WebP.

I know you are wondering what a fallback option is…


Fallback options are like backup plans in case something doesn’t work as expected. They provide an alternative solution or choice when the first option is unavailable or incompatible. For example, let’s say you have a fancy new website that uses a modern feature, but not all web browsers support it. In this case, a fallback option would be to provide a simpler version or alternative feature that works across all browsers, ensuring that everyone can still access and enjoy your website, even if they don’t have the latest technology. It’s like having a safety net in place to ensure a smooth experience for all users, regardless of their device or browser capabilities.

By utilizing WebP, website owners can enhance the user experience by delivering visually appealing images with faster loading times, resulting in a more efficient and enjoyable browsing experience for visitors.

Knowing the common image file types empowers you to choose the right format for your needs, whether it’s for sharing, web design, or professional photography. Each format has its strengths and best applications, from the widely compatible and compressed JPEG to the transparent-background-friendly PNG or the fun and animated GIF. By understanding these image file types, you can make informed decisions, optimize image quality and file size, and enhance your visual experiences in the digital realm.

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