The same picture may need one format for a website, another for a client, and a third for a marketplace upload. Saving a photo as PNG can make it unnecessarily large; saving a transparent logo as JPG removes the transparency. Start with where the image is going, not a memorized ranking of formats.
Skip theoretical compression records. Resize each candidate to the same dimensions, make the visible quality comparable, and then check file size and whether the destination can actually open it.
A quick answer
With no special requirement, start photos as JPG or WebP and transparent artwork as PNG or WebP. Use AVIF after testing it in your CMS, browsers, and handoff workflow. Keep the source separately; a delivery copy is not a master file.
What each format is designed to do
JPG uses lossy compression and is effective for continuous-tone photography. It is widely accepted but cannot store transparency. PNG uses lossless compression and is a strong fit for interface captures, diagrams, icons, and transparent assets; a large photograph saved as PNG is rarely an efficient delivery file.
WebP can be lossy or lossless and can carry an alpha channel, which makes it a flexible web format. AVIF often compresses photographic detail efficiently, but encoding time and support across content systems, editors, and downstream services still need to be checked.
| Format | Good fit | Transparency | Main strength | Watch for |
|---|---|---|---|---|
| JPG | Photos, product shots, article headers | No | Broad compatibility and quick export | Repeated saves accumulate loss |
| PNG | Screenshots, icons, text, transparent art | Yes | Lossless edges and alpha | Photographs can be very large |
| WebP | Web photos and transparent web assets | Yes | Balanced web delivery | Some older editing workflows |
| AVIF | Modern sites sensitive to transfer size | Yes | High compression potential | Encoding and pipeline support |
Choose by image content and destination
Camera photographs, portraits, and textured product scenes generally start with JPG or lossy WebP. Admin screenshots, QR codes, and tutorials containing small text depend on clean high-contrast edges, so PNG is often safer than a low-quality JPG. A logo that must sit on different page colors should retain transparency in PNG or WebP.
One source may need several delivery copies. A shop can retain a high-quality master, use WebP on its own site, and submit the JPG required by a marketplace. Format choice is part of delivery, not a reason to discard the editable original.
- Moving files through office software, messaging apps, or older admin systems: prefer JPG or PNG.
- Publishing only to a site you control: compare WebP and AVIF, with a fallback where needed.
- Continuing to mask, lay out, or retouch the asset: retain an editable source with transparency and layers.
Run a comparison that means something
A common mistake is comparing files with different dimensions, crops, and visible quality. Fix the dimensions first, such as 1600 by 1200 pixels, then export from a higher quality setting downward. Inspect skin, hair, lettering, sky gradients, and shadow detail as well as the total file size.
Place the candidates in the actual page. A halo or banding that is easy to miss in an isolated viewer can become obvious on a dark background, a dense display, or a zoomable product gallery.
- Duplicate the source and determine the largest pixel dimensions needed at the destination.
- Export JPG and WebP candidates; include PNG or transparent WebP when alpha is required.
- Compare them at the same display size and reject versions with visible defects.
- Record the size and compatibility of the acceptable files before choosing the delivery format.
Compatibility includes the whole workflow
Browser support is only one link in the chain. A content management system may recompress uploads, an email client may not render a newer format, and an editor may import color or alpha data incorrectly. Open the finished file in the software the recipient will actually use.
A website can offer modern sources to capable browsers while keeping a JPG or PNG fallback. For social networks and marketplaces, follow the upload specification and inspect the platform-generated copy. Reliability is often worth more than a tiny size difference when the platform will encode the image again.
Frequently asked questions
Is WebP always smaller than JPG?
No. The encoder, dimensions, quality setting, and picture content all matter. Compare the formats at the same dimensions and similar visible quality rather than comparing default exports.
Can every website use AVIF for every image?
AVIF can work well in a verified modern pipeline, but check the CMS, image CDN, social preview crawler, and editing workflow. Keep WebP or JPG fallback paths when those systems are outside your control.
Why does text become soft after converting a screenshot to JPG?
Lossy JPG compression introduces blur and artifacts around high-contrast edges. Screenshots with small text or interface lines are usually better served by PNG or a carefully tested WebP export.