WebP vs JPEG vs PNG: Which Image Format Should You Use?

Pick the wrong image format and you pay for it twice: once in page weight that slows your site down, and once in visual quality you can never get back. The good news is that the decision between WebP, JPEG, and PNG comes down to a handful of predictable factors. This guide covers how each format compresses data, what each one supports, and which format fits each common job.

How Each Format Compresses Images

The three formats make fundamentally different tradeoffs between size and fidelity.

JPEG: lossy compression built for photos

JPEG was standardized in 1992 by the Joint Photographic Experts Group, and it was designed around one insight: human eyes tolerate small inaccuracies in color and fine detail far better than in brightness and overall shape. JPEG uses this in two ways.

First, it converts the image from RGB to a luminance-plus-chrominance space and typically subsamples the color channels at 4:2:0, storing half the horizontal and vertical color resolution. Your eyes barely notice. Second, it applies a lossy transform (discrete cosine transforms on 8x8 pixel blocks), then throws away high-frequency detail depending on the quality setting.

At quality 75-85, a JPEG is usually 10 to 20 times smaller than the raw pixels while looking nearly identical for photographic content. That is why JPEG dominated the web for three decades.

The cost: JPEG compression is not reversible. Every time you re-save a JPEG, you lose a little more quality. This is called generation loss, and it is why you should never edit and re-save a JPEG repeatedly.

PNG: lossless compression built for precision

PNG (Portable Network Graphics, 1996) was created as a patent-free replacement for GIF, and it takes the opposite approach: it is always lossless. PNG uses the DEFLATE compression algorithm, the same family as ZIP. No detail is discarded, and re-saving a PNG a hundred times changes nothing.

That precision has a price. For photographs, PNG files are commonly 5 to 10 times larger than a visually equivalent JPEG, because photographic noise and gradient detail defeat DEFLATE’s pattern-matching. Where PNG shines is flat-color content: screenshots, logos, diagrams, charts, and UI graphics compress extremely well because large runs of identical pixels encode in almost no space.

PNG also supports a full 8-bit alpha channel (256 levels of transparency), and 16 bits per channel for high-precision editing workflows.

WebP: both modes in one container

WebP came from Google in 2010, derived from the VP8 video codec’s intra-frame coding. It is the only one of the three that offers both lossy and lossless modes, plus features the older formats lack:

• Lossy WebP: typically 25-34% smaller than a comparable JPEG at equivalent perceptual quality (based on Google’s SSIM studies)
• Lossless WebP: about 26% smaller than the same image in PNG
• Alpha transparency: supported in both lossy and lossless modes (JPEG has none at all)
• Animation: WebP files can be animated, effectively replacing GIF at a fraction of the size

The practical result: WebP can do almost everything JPEG and PNG do, in less space. Its historical weakness was support, which is the next topic.

Browser Support History

For years, WebP was technically superior but practically risky because major browsers did not support it.

• 2010-2013: Chrome and Opera support lossy WebP from early on; the rest of the web ignores it
• January 2014: Chrome 32 ships lossless, animated, and transparent WebP support
• September 2015: Microsoft Edge adds WebP (initially behind a flag in some builds)
• January 2019: Firefox 65 is the last major holdout to add support
• September 2020: Safari 14 (macOS Big Sur and iOS 14) completes universal coverage; Internet Explorer 11 never supported it

Since late 2020, WebP has worked in every mainstream browser. Today global support sits above 95 percent of users. The remaining edge cases are old browsers in enterprise environments and some non-browser software.

That software caveat matters more than the browser one. Plenty of desktop applications, CMS upload validators, and older email clients still reject WebP files. If you are distributing images for other people to edit or reuse, JPEG and PNG remain the safe interchange formats.

Side-by-Side Comparison

Feature	JPEG	PNG	WebP
Compression	Lossy only	Lossless only	Lossy and lossless
Typical photo size (baseline)	100 percent	500-1000 percent	65-75 percent
Transparency	No	Yes (8-bit alpha)	Yes (both modes)
Animation	No	No (APNG is rare)	Yes
Max bit depth	8-bit	16-bit per channel	8-bit
Best for	Photos, universal sharing	Screenshots, logos, editing masters	Web delivery of everything
Re-save quality loss	Yes, every save	No	Only in lossy mode

Which Format for Which Job

Photographs on a website

Serve WebP first. A quality 75-80 WebP of a photo typically lands 25-30 percent smaller than a quality 80 JPEG with no visible difference, and image weight is one of the largest levers on page load time. If your CMS or build pipeline supports automatic format negotiation (serving AVIF and WebP with a JPEG fallback), use it. If you can only produce one file, WebP is now safe for effectively all web audiences.

Before upload, resize images to the largest size they will actually be displayed at. A 4000-pixel-wide camera original displayed at 800 pixels wide wastes roughly 96 percent of its bytes.

Screenshots, UI graphics, and diagrams

Use PNG, or lossless WebP if you control the serving environment. Flat-color content is where PNG’s lossless approach is both small and perfect. Text edges in particular look smeared under JPEG compression because the 8x8 block transform rings around high-contrast edges. Never save a screenshot as JPEG unless you want blurry, ringing text.

Logos and images with transparency

PNG has been the default answer for two decades, but lossy WebP with alpha is often dramatically smaller for photorealistic content with soft transparent edges (product shots with shadows, for example). For a crisp logo with hard edges, PNG or lossless WebP avoids compression artifacts along the transparency boundary. JPEG is simply not an option here; it has no alpha channel at all.

Editing masters and exports

Keep working files in a lossless format. PNG works well up to 8-bit precision; if you are doing serious color work, use PNG’s 16-bit mode or a format like TIFF. Every time you save a JPEG you permanently discard detail, so treat JPEG (and lossy WebP) as final outputs, never as intermediate files. A safe workflow: edit a lossless master, then export a compressed copy for each destination at the size and format that destination needs.

Email and third-party platforms

JPEG and PNG. Many email clients, marketplace uploaders, and print services still reject WebP. When maximum compatibility matters more than maximum compression, JPEG for photos and PNG for graphics is still the correct answer in 2026.

Quality Settings That Actually Work

Compression quality sliders are where most files get ruined. These settings hold up in practice:

• JPEG quality 75-85: photographic sweet spot; below 70, blocky artifacts appear in gradients and around edges
• WebP quality 75-80: visually equivalent to JPEG 80-85 at a quarter less weight
• PNG: no quality slider (it is lossless), but reduce colors to 256 (PNG-8) for flat graphics when you can, often cutting size by more than half
• Resize before compressing: order matters; resizing after compression re-introduces artifacts from the previous encode

One honest caveat: quality metrics like SSIM do not perfectly match human perception. Edges, text, and skin tones degrade differently at the same numeric quality. Always eyeball the compressed result at 100 percent zoom on the actual content you ship, especially text overlaid on photos.

Try the Tool

Ready to put this into practice? Use the Image Compressor to shrink JPEG, PNG, and WebP files with quality control, the Image Format Converter to move between WebP, JPEG, and PNG, and the Image Resizer to get files to the exact pixel dimensions you need before compressing.