PNG vs JPG: When to Use Each Format

Use JPG for photographs and other images with lots of colors, where a smaller file matters. Use PNG for logos, screenshots, and graphics that need sharp edges or a transparent background. JPG cannot store transparency, so a transparent area becomes a solid box, usually white or black. PNG keeps every pixel and gets large on photographs. PNG to JPG and JPG to PNG change the container and leave any existing JPG artifacts in place.

A logo delivered as a JPG can look fine on a white header and show a gray box on a dark footer. Masking those edges in Photoshop can take twenty minutes, work you skip if the asset arrives as a PNG. The same mismatch shows up as a 4 MB product photo that should be about 200 KB, or as an icon whose edges have gone soft.

What PNG and JPG store

Both PNG and JPG (JPEG) are raster formats. They store images as a grid of pixels. They differ in how those pixels are encoded and which features they support.

JPEG (JPG) uses lossy compression. It discards data the eye is unlikely to notice, especially in smooth gradients and photographs. Files get smaller, and quality drops again every time you re-save.

PNG uses lossless compression. Every pixel is preserved. PNG also supports an alpha channel for partial and full transparency, which JPG cannot do.

What the wrong format costs

A photograph saved as PNG adds page weight, which shows up in Core Web Vitals and on mobile data. A logo saved as JPG develops fuzzy edges, color banding on flat fills, and ringing around text.

Search engines factor page speed into rankings, and people leave slow pages. A 3 MB PNG hero on a product page is doing that damage when a 180 KB JPG looks the same at 1200 px wide.

How each format encodes images

| Factor | JPG | PNG | |--------|-----|-----| | Compression type | Lossy | Lossless | | Transparency | No | Yes (alpha channel) | | Best for | Photos, gradients | Logos, icons, screenshots | | Typical photo file size | Small | Large (3-10x bigger) | | Text and sharp edges | Moderate (artifacts) | Excellent | | Editing tolerance | Poor. Each save degrades | Good. No cumulative loss | | Animation | No (use GIF/WebP) | APNG (limited support) | | Color depth | 24-bit color | Up to 48-bit; also indexed PNG-8 |

When to use JPG

Choose JPG when:

• The image is a photograph: product shots, team photos, lifestyle imagery
• The scene has many colors and smooth gradients, where lossy compression hides well
• File size matters: email attachments, social media, gallery grids
• You need a thumbnail or preview at moderate resolution
• Transparency is not required

Export at quality 80 to 85 for the web. Resize to the display width before saving. A 4000 px photo displayed at 800 px wastes bytes in either format.

When to use PNG

Choose PNG when:

• The image is a logo, icon, or UI element with sharp edges
• You need a transparent background so the graphic can sit on different colors
• The image contains small text: screenshots, diagrams, annotated mockups
• Exact colors must be preserved, including brand files that require lossless assets
• You will edit the file more than once and cannot afford loss between saves

Skip PNG for full-bleed photographs on web pages unless you have a compression plan. A single uncompressed PNG photo can exceed 10 MB.

For transparency-specific workflows, see PNG Transparency for Web Usage.

When to skip each format

Skip JPG for:

• Logos and icons, because compression creates halos around edges
• Screenshots with small text, because glyphs smear at moderate quality
• Images that need transparency
• Assets you will edit and re-save several times
• Flat-color graphics, because banding appears in solid fills

Skip PNG for:

• Large photographs on the web when you have no compression step
• Email newsletters, where some clients mishandle transparency
• Cases where file size comes first and a quality-80 JPG is enough

Pick a format and prepare the file

1. Identify the content: photo, logo, screenshot, or illustration.
2. Ask whether the image sits on a background that is not a solid color.
3. Choose JPG for photos, PNG for graphics with hard edges or alpha.
4. Resize first with Resize Image to the pixel width it will display at.
5. Export or convert. Use PNG to JPG if a photo is trapped in PNG, or JPG to PNG when you need lossless re-editing.
6. Compress with Compress Image and check at 100% zoom.
7. Consider WebP. WebP Converter often beats both formats on size for web delivery.

Examples

E-commerce product photo. A 3000 x 3000 px camera shot displayed at 800 px on the product page. Saved as PNG: 4.2 MB. Resized to 800 px and exported as JPG quality 85: 112 KB. No visible difference on a phone screen.

SaaS dashboard icon. A 64 x 64 px settings gear on a dark sidebar. JPG created a visible gray box. PNG-24 with transparency: 3 KB. SVG would be even smaller, but that raster pipeline only supported PNG.

Blog tutorial screenshot. A 1400 px wide capture with code snippets and UI chrome. PNG kept the text readable at 340 KB. The same image as JPG quality 75 blurred 12 px monospace text.

Email newsletter hero. A full-width banner saved as PNG at 2.1 MB can trip spam filters and load slowly. JPG at quality 82: 190 KB. Transparency was not needed, because the banner sat on a white email body.

Working habits

• Keep masters separate from web copies. Store the original RAW, PSD, or lossless PNG in an archive folder. Export web JPGs from that master, never from a previous JPG.
• Try WebP for current browsers. It covers lossy photos and lossless UI work. Keep JPG or PNG fallbacks only where you still need them.
• Crop before converting. A full-desktop screenshot saved as PNG is enormous. Crop to the relevant window first.
• Oversized images are a common cause of poor LCP scores. Read Core Web Vitals and Images for the performance side.

Mistakes that show up in the file

Saving a logo as JPG puts compression rings around every edge. On any background that is not white, the logo looks unfinished.

Using PNG for every photo inflates page weight. Google PageSpeed flags oversized images quickly.

Converting JPG to PNG to "fix" quality leaves the artifacts in place. You need the original source file.

Ignoring display size means a 4000 px image shown at 400 px should be resized before you pick a format.

Re-saving a JPG during editing adds loss each time. Edit in PNG or another lossless format, then export JPG once at the end. See JPG Artifacts Explained for what the loss looks like.

Troubleshooting

| Problem | Likely cause | Fix | |---------|--------------|-----| | Gray box around image on dark background | JPG used where transparency needed | Re-export as PNG with alpha | | Logo edges look fuzzy | JPG compression on sharp graphics | Switch to PNG or SVG | | Photo file is several MB | PNG used for a photograph | Convert to JPG at quality 80-85 | | Banding in sky or skin | JPG quality too low | Re-export from master at higher quality | | PNG screenshot is huge | Full-screen capture with many colors | Crop, try WebP lossless, or compress | | Colors shifted after conversion | Color profile stripped | Embed sRGB profile; test on target device |

Privacy and browser processing

Vertex Solutions image tools process files in your browser. Images stay on your device during conversion and compression. Nothing is uploaded, and no account is required. That matters for unreleased product shots and client assets under NDA.

Limitations

SVG beats both for simple icons and logos that need to scale. WebP and AVIF are smaller than JPG and PNG for web delivery, and they lack universal support in older clients. GIF still works for short animations and is a poor fit for photos. Pick the format for the place the file will be seen.

Related articles

• PNG Transparency for Web Usage: alpha channels and overlay workflows
• JPG Artifacts Explained: what lossy compression does to images
• Core Web Vitals and Images: how format choice affects page speed
• Screenshot Compression for Docs: keeping tutorial images sharp and small

Photographs belong in JPG. Logos and screenshots belong in PNG. If you can say whether the file is a photo and whether it needs transparency, the format is usually settled. Resize, compress, and check at 100% zoom before you publish.