PNG vs JPG: Which Image Format Should You Use?
PNG and JPG are the two most common image formats on the web, and choosing the wrong one costs you either quality or speed. The short version: JPG for photos, PNG for graphics and transparency. This guide explains why, with real file-size numbers and the exact rules professionals use.
Quick Answer: PNG or JPG?
Choose JPG when…
- The image is a photograph or has smooth gradients
- You need a small file for web pages, email, or uploads
- Transparency is not required
- You're sharing to social media or marketplaces
Choose PNG when…
- The image has text, sharp lines, or flat colors (logos, icons, charts, screenshots)
- You need a transparent background
- The file will be edited again later (lossless master copy)
- Pixel-perfect quality matters more than size
How Each Format Works
JPG (or JPEG, Joint Photographic Experts Group) uses lossy compression. It divides the image into 8x8 pixel blocks and discards fine detail your eye is least likely to notice - subtle color variations, high-frequency texture. The more you compress, the more detail is thrown away permanently. That's why a heavily compressed JPG shows blocky "artifacts" around sharp edges and text.
PNG (Portable Network Graphics) uses lossless compression, similar to how a ZIP file works. Every single pixel is preserved exactly. PNG also supports an alpha channel - per-pixel transparency from fully opaque to fully invisible - which JPG simply does not have.
This single difference - lossy vs lossless - drives every practical rule in this article. If you want a deeper primer on compression itself, read our guide on image compression without quality loss.
PNG vs JPG Side by Side
| JPG | PNG | |
|---|---|---|
| Compression | Lossy (quality is discarded) | Lossless (pixel-perfect) |
| Transparency | No | Full alpha channel |
| Best for | Photos, gradients, social uploads | Logos, icons, text, screenshots |
| Typical photo size (12MP) | 2–4 MB | 15–25 MB |
| Typical logo size (800px) | 60–120 KB (with edge artifacts) | 20–50 KB (sharp) |
| Animation | No | No (APNG variant exists) |
| Re-editing | Quality degrades on each re-save | No generation loss |
| Browser support | Universal | Universal |
When to Use PNG
- Logos and brand assets. Sharp edges stay sharp, and the transparent background drops onto any page or product image. See how to make transparent PNGs for free.
- Screenshots with text. JPG compression smears small text; PNG keeps UI captures crisp for documentation and support tickets.
- Charts, diagrams, and flat illustrations. Large areas of identical color compress extremely well in PNG - often smaller than JPG and better looking.
- Master copies you will edit again. Every JPG re-save loses more quality. Keep the working file as PNG, export JPG only at the final step.
- Anything needing transparency - watermarks, overlays, cutouts from a background remover.
When to Use JPG
- Photographs of any kind. Faces, products, landscapes - JPG at 80-90% quality is visually identical to lossless for a fraction of the size.
- Web page images. Smaller files mean faster Largest Contentful Paint and better Core Web Vitals. (WebP is even better - more below.)
- Email attachments and uploads with size limits. A 20 MB PNG photo becomes a 2 MB JPG with no visible difference.
- Marketplace and social media listings. Most platforms re-compress your upload to JPG anyway, so uploading an enormous PNG gains nothing.
File Size: Real-World Numbers
Here's what the same images look like saved in both formats:
| Image | As PNG | As JPG (85%) | Winner |
|---|---|---|---|
| 4000x3000 smartphone photo | 18.4 MB | 2.1 MB | JPG (9x smaller) |
| 1920x1080 landscape wallpaper | 4.8 MB | 520 KB | JPG (9x smaller) |
| 800x800 flat-color logo | 32 KB | 74 KB | PNG (smaller and sharper) |
| 1280x720 UI screenshot with text | 210 KB | 190 KB | PNG (similar size, much sharper text) |
The pattern is consistent: continuous-tone images favor JPG, flat-color images favor PNG. When in doubt, save both and compare - or just run the image through our image compressor and let the numbers decide.
Transparency and Editing
Transparency is the one capability JPG cannot offer at any setting. When you convert a transparent PNG to JPG, the transparent pixels must be filled with a solid color - Snipinsta uses white by default. That's fine for photos, but it ruins logos meant to sit on colored backgrounds.
For editing workflows, remember that JPG suffers generation loss: open, edit, re-save as JPG, and quality drops a little each time. PNG has no such decay, which is why designers keep masters in PNG (or TIFF) and export JPG only for delivery. More on alpha channels in Understanding Image Transparency.
Web Performance (and Where WebP Fits)
In 2026 the honest answer to "PNG or JPG for my website?" is often "neither - use WebP." WebP delivers roughly 25-35% smaller files than JPG at the same visual quality, and it supports transparency like PNG. Browser support is universal across Chrome, Firefox, Safari, and Edge.
The practical pipeline most teams use:
- Keep the lossless master (PNG or original camera file).
- Convert to WebP for web delivery: JPG to WebP or PNG to WebP.
- Keep a JPG/PNG fallback only if you target very old in-app browsers.
Full details in What Is WebP? Complete Guide and the WebP Optimization SEO Guide.
How to Convert Between PNG and JPG for Free
Snipinsta converts both directions in your browser, free, with batch support and no watermark:
Shrink screenshots and graphics into shareable JPGs. Transparency becomes white.
Open PNG to JPGCreate a lossless, edit-friendly copy or prepare for transparency work.
Open JPG to PNGNeed other pairs? The all-format image converter handles WebP, HEIC, AVIF, BMP, and TIFF too, with up to 20 files per batch.
Frequently Asked Questions
Bottom line: photos go JPG (or WebP), graphics and transparency go PNG. Keep lossless masters, export lossy for delivery, and let the converter do the rest.