JPG and PNG are the two most widely used image formats in existence, yet most people use them without understanding the technical differences that actually matter. Choosing the wrong format leads to real problems: bloated web pages, quality degradation through editing cycles, broken transparency in designs, or compatibility failures in specific applications.
This guide provides a complete technical and practical comparison of JPG vs PNG — covering compression type, color depth, transparency support, browser compatibility, print use, and file size across different image types. We'll also look at four converters that handle the transition between formats, and provide a use-case verdict table to make the decision easy.
Format Comparison Table: JPG vs PNG
| Feature | JPG / JPEG | PNG |
|---|---|---|
| Compression type | Lossy (data permanently discarded) | Lossless (data fully preserved) |
| Transparency (alpha) | Not supported | Full alpha channel |
| Color depth | 24-bit (16.7M colors) | Up to 48-bit (281 trillion colors) |
| Max colors displayed | 16.7 million (24-bit RGB) | 16.7 million (PNG-24) or 256 (PNG-8) |
| File size (photograph) | Smaller (compression loses data) | 3–5× larger than equivalent JPG |
| File size (flat graphics) | Worse than PNG (artifacts) | Often smaller than JPG for flat colors |
| Browser support | Universal | Universal |
| Print support | Excellent | Excellent |
| EXIF metadata | Full support | Limited support |
| Progressive loading | Supported | Supported (interlaced) |
| Re-save quality loss | Yes — degrades each save | No degradation ever |
| Best use case | Photographs for web/email | Graphics, UI, transparency, editing |
Tool Deep-Dives: 4 Converters With Score Cards
ConvertiImage
Browser-based, no account required. Handles both JPG→PNG and PNG→JPG conversion with batch support for up to 20 files.
Best for most users Free
Squoosh
Google's in-browser tool. Runs entirely locally using WebAssembly — nothing is uploaded. Ideal for sensitive images. Single file only.
Best for privacy Free
CloudConvert
Cloud-based with 200+ format support. Best for advanced users needing DPI control, color profiles, and metadata management.
Best for advanced options 25 free/day
XnConvert
Free desktop application for Windows, Mac, and Linux. Unlimited batch processing offline. Best for professional workflows handling thousands of files.
Best for large batches Free desktop
Use-Case Verdict Table: Which Format Wins?
| Scenario | Best Format | Reason |
|---|---|---|
| Blog post photograph | JPG or WebP | Smaller file, faster page load, no quality benefit to PNG for photos |
| App icon / UI element | PNG | Requires transparency, sharp edges benefit from lossless compression |
| Company logo (design use) | PNG | Needs transparent background for placement over any color |
| Product photo (e-commerce) | PNG (master) + WebP (web) | PNG for editing master, WebP for final web delivery |
| Screenshot documentation | PNG | Sharp text and UI elements compress better and look cleaner in PNG |
| Email photo attachment | JPG | Smaller file size critical; PNG photos often trigger size limits |
| Print artwork (high-res) | PNG or TIFF | Lossless preservation essential for enlargement; no compression artifacts |
File Size Reality: What to Expect When You Convert
The file size difference between JPG and PNG depends heavily on image content. Here's what the data shows across different image types:
| Image Content | JPG @ Q85 | PNG-24 | PNG-8 | WebP |
|---|---|---|---|---|
| Landscape photo (3000×2000) | 1.8 MB | 7.2 MB | N/A* | 1.1 MB |
| Portrait photo (2000×2500) | 1.2 MB | 4.9 MB | N/A* | 800 KB |
| Logo (500×200, flat colors) | 45 KB | 22 KB | 8 KB | 14 KB |
| Screenshot (1920×1080) | 320 KB | 480 KB | 180 KB | 210 KB |
*PNG-8 is not suitable for photographs due to 256-color limitation causing severe banding.
Note the counterintuitive result for logos: PNG-24 is actually smaller than JPG at quality 85 for flat-color graphics. This is because JPEG's compression algorithm creates artifacts (color noise around flat areas) that end up being larger in file size than PNG's efficient run-length encoding for solid colors.
File Size Reality: What to Expect When You Convert
The file size difference between JPG and PNG depends heavily on image content. Here's what the data shows across different image types:
*PNG-8 is not suitable for photographs due to 256-color limitation causing severe banding.
Note the counterintuitive result for logos: PNG-24 is actually smaller than JPG at quality 85 for flat-color graphics. This is because JPEG's compression algorithm creates artifacts (color noise around flat areas) that end up being larger in file size than PNG's efficient run-length encoding for solid colors.
Best JPG to PNG Converter: Keep Transparency and Quality (2026) — Full tool comparison guide.
How to Convert JPG to PNG Without Losing Quality in 4 Steps — Step-by-step conversion walkthrough.
