There is no single best image format for every situation. The right choice depends on what the image contains, where it is going, how widely it must be supported, and whether file size or exact image data matters most. The easiest way to choose is to start with the destination rather than the file extension.
JPG: the practical compatibility choice
JPG is a strong default for photographs when you need broad compatibility. It is supported by browsers, office software, upload forms and image editors. Its compression is lossy, so keep a higher-quality original when the image is important.
PNG: graphics, screenshots and transparency
PNG is useful when preserving graphics cleanly matters or when transparent pixels are required. It can be a poor choice for large photographs because a lossless representation can become much larger than a photographic compression format.
WebP: modern web delivery
WebP is a useful choice for many websites because it was designed for efficient image delivery and has broad modern browser support. Before using it in a general-purpose workflow, verify that the CMS, editor or recipient accepts WebP.
HEIC: efficient photo storage on supported devices
HEIC is useful when the devices and applications in the workflow support it. It can be an efficient format for camera photographs, but compatibility is less universal than JPG. Convert a copy when a destination requires a more widely supported format.
Decision table
| If your main goal is... | Start with... | Why |
|---|---|---|
| Share a photo almost anywhere | JPG | Broad compatibility |
| Keep an efficient phone photo library | HEIC | Efficient supported storage |
| Preserve screenshot/graphic details | PNG | Lossless representation |
| Deliver images on a modern website | WebP | Efficient web-focused format |
Do not confuse format, size and dimensions
Changing HEIC to JPG changes the format. Resizing changes pixel dimensions. Compression changes how image data is encoded. A destination may care about any one of these separately. If an upload says “maximum 2 MB,” compressing may help. If it says “maximum 1600 × 1600 pixels,” resizing is the relevant operation.
A reliable rule of thumb
Use the original format when it works and offers a meaningful advantage. Convert only when the destination, compatibility requirement or workflow gives you a reason. Keeping the original and creating purpose-specific copies is often better than forcing every image into one format.