JPG vs PNG — When to Use Which (And Why It Matters More Than You Think)

The Wrong Choice Costs You More Than You Realize

Using PNG for a photograph? You're serving files 5-10x larger than necessary. Using JPG for a screenshot with text? You're getting blurry artifacts around every letter. Using either for a logo? You should probably be using SVG.

The JPG vs PNG decision isn't academic — it directly affects page load times, storage costs, print quality, and visual clarity. Here's how to always choose correctly.

The Fundamental Difference

JPG is lossy. It analyzes an image, identifies details the human eye is least likely to notice, and permanently discards them. The result: dramatically smaller files, with quality loss that ranges from invisible to obvious depending on compression level. PNG is lossless. Every pixel is preserved exactly. The file size reduction comes from pattern compression (like ZIP), not from throwing away data. The result: larger files, perfect quality.

That's the entire decision framework in two paragraphs. Everything else is nuance.

The Quick Decision Chart

Image Contains	Use	Why
Photograph	JPG or WebP	Lossy compression excels at gradients and complex color
Screenshot of text	PNG	JPG creates artifacts around sharp text edges
Logo on white background	PNG (or SVG)	Sharp edges, flat colors — PNG's strength
Logo with transparency	PNG (or SVG)	JPG doesn't support transparency
Chart or diagram	PNG	Sharp lines and text need lossless
Icon or UI element	SVG or PNG	Vector preferred; PNG as raster fallback
Social media post	JPG	Platforms recompress anyway
Print material	TIFF or PNG	Lossless preserves print quality

Real File Size Comparisons

We tested the same images saved as both JPG (quality 85) and PNG:

Image Type	JPG Size	PNG Size	JPG:PNG Ratio
Photo (landscape, 1920x1080)	380 KB	3.8 MB	1:10
Photo (portrait, close-up)	290 KB	2.9 MB	1:10
Screenshot (code editor)	185 KB	210 KB	1:1.1
Screenshot (web page)	350 KB	1.1 MB	1:3
Logo (flat colors, 500x500)	45 KB	18 KB	2.5:1
Diagram (lines and text)	120 KB	65 KB	1.8:1
Gradient graphic	95 KB	580 KB	1:6

Notice something interesting: for images with flat colors and sharp edges (logos, diagrams), PNG is actually smaller than JPG. That's because JPG's compression algorithm is optimized for gradual color transitions, not sharp boundaries. Flat color regions compress beautifully with PNG's lossless approach.

The Artifacts Problem

JPG compression creates visible artifacts at edges where colors change sharply. These are called "ringing" or "mosquito noise" — little halos and smudging around text, lines, and boundaries.

At quality 95, artifacts are invisible. At 85, they're invisible in photographs but barely visible around text if you zoom in. At 70, they're noticeable around text and sharp edges. At 50, they're ugly everywhere.

This is why screenshots of text should always be PNG. Even "high quality" JPG introduces slight fuzziness around every letter.

Transparency: PNG's Killer Feature

JPG doesn't support transparency. Period. Every pixel has a color. If your image needs a transparent background — for overlaying on different colored pages, for product photos, for logos — you need PNG (or WebP/AVIF).

PNG supports full alpha transparency: each pixel can be fully transparent, fully opaque, or anywhere in between. This allows smooth anti-aliased edges against any background.

What About WebP?

WebP beats both JPG and PNG at their own games:

• For photos: ~30% smaller than JPG at equivalent quality


• For graphics: often smaller than PNG with lossless mode


• Supports transparency (unlike JPG)


• Supported in all browsers since 2020

So why do JPG and PNG still exist? Inertia and compatibility. Email clients, Office documents, some CMS platforms, print workflows, and legacy systems still expect JPG or PNG. WebP is the web's future; JPG and PNG are still everyone's present.

Convert between all three with MyPDF's Image Converter.

The Color Space Gotcha

JPG uses 8-bit color (16.7 million colors) and supports both sRGB and CMYK.
PNG uses 8-bit or 16-bit color (up to 281 trillion colors) but only supports RGB.

For print: if you need CMYK color space, JPG or TIFF are your options. PNG is RGB-only.
For web: everything is sRGB, so this doesn't matter.

My Recommendation

Stop overthinking it. Follow this rule:

• Has transparency? → PNG
• Is a photo? → JPG (or WebP if web-only)
• Is a screenshot, diagram, or text-heavy? → PNG
• Unsure? → PNG (it's never wrong, just sometimes larger than necessary)

And if you're building a website in 2026, use WebP for everything and stop worrying about it entirely.

Related Tools

• Convert Image — Convert between JPG, PNG, WebP, and more
• Compress Image — Optimize file sizes
• JPG to PDF — Create PDFs from images
• PNG to JPG — Quick format conversion