Two of the most common image formats on the web serve very different purposes. This guide explains the technical differences between PNG and JPG, when each format is the right choice, and how to convert between them.
JPG (also written JPEG) is a lossy image format designed for photographs and complex images with smooth color gradients. When you save a file as JPG, the encoder analyzes the image and discards visual information that the human eye is unlikely to notice. This process -- called lossy compression -- produces dramatically smaller files compared to the original uncompressed data.
The trade-off is permanent. Every time a JPG file is opened, edited, and saved again, the encoder discards more data, and quality degrades further. This is sometimes called generation loss. A single export at quality 80-85 looks excellent for most photographs, but repeated editing cycles can introduce visible artifacts: blocky patches, color banding, and blurred edges.
JPG does not support transparency. Any transparent area in the source image is flattened to a solid color -- usually white -- during export. The format supports 8-bit color depth with up to 16.7 million colors, which is more than enough for photographic content.
JPG remains the default image format for digital cameras, social media uploads, email attachments, and most web photography. Its combination of small file size and broad compatibility makes it the practical choice whenever the image is a photograph and transparency is not needed.
PNG (Portable Network Graphics) is a lossless image format originally designed as a patent-free replacement for GIF. Unlike JPG, PNG compression preserves every pixel of the original image exactly. No visual data is discarded during encoding, which means a PNG file can be opened, edited, and re-saved any number of times without quality degradation.
The defining feature of PNG is its support for transparency. PNG images can include an alpha channel that controls the opacity of each pixel, allowing smooth transparency gradients -- not just fully transparent or fully opaque pixels. This makes PNG the standard format for logos on colored backgrounds, UI elements, icons, and any graphic that needs to be layered over other content.
PNG supports multiple color depths: 8-bit indexed color (256 colors, similar to GIF), 24-bit true color (16.7 million colors without transparency), and 32-bit true color with a full alpha channel (16.7 million colors plus 256 levels of transparency per pixel). Some implementations also support 16-bit-per-channel color for specialized workflows.
The main drawback of PNG is file size. Because lossless compression retains all pixel data, PNG files are typically 5 to 10 times larger than an equivalent JPG for photographic content. For graphics with large areas of flat color, text, or simple shapes, PNG compression works efficiently and the size penalty is smaller. PNG does not natively support animation in the standard specification, though APNG (Animated PNG) exists as an extension with partial browser support.
| Feature | JPG | PNG |
|---|---|---|
| Compression | Lossy | Lossless |
| File size | Smaller | Larger |
| Transparency | No | Yes (full alpha channel) |
| Best for | Photos | Graphics, text, logos |
| Color depth | 8-bit (16M colors) | 8/16/24/32-bit (full RGBA) |
| Animation | No | APNG (partial support) |
| Editing | Degrades on re-save | No quality loss on re-save |
JPG is the right choice in most situations involving photographic content where transparency is not required. The format produces the smallest files for visually complex images, which directly translates to faster page loads, lower bandwidth costs, and better performance on mobile connections.
PNG is the right choice when pixel-perfect accuracy, transparency, or crisp edges on text and graphics matter more than file size. Use PNG in the following situations:
Converting between formats is straightforward with browser-based tools. If you have a PNG photograph that needs to be smaller for web use, convert it to JPG using the PNG to JPG converter. The converter lets you set the output quality level, so you can balance file size against visual fidelity.
If you need to add transparency to a JPG image or preserve it for further editing without quality loss, convert it to PNG using the JPG to PNG converter. Note that converting a JPG to PNG will not restore detail already lost during JPG compression -- it preserves the current state of the image in a lossless container.
Both tools run entirely in your browser. No files are uploaded to any server.
No. JPG compression is lossy and irreversible. Converting to PNG preserves current quality but cannot restore lost detail. The resulting PNG file will actually be larger than the JPG while containing the same visual information.
PNG uses lossless compression, keeping every pixel intact. JPG discards visual data humans are unlikely to notice, resulting in much smaller files. For a typical photograph, a PNG file can be 5 to 10 times larger than a JPG at quality 80-85 with no visible difference to the viewer.
You can, but file sizes will be 5-10x larger than JPG with no visible quality difference for photographs. PNG is better suited for graphics, text, and images requiring transparency. If you need lossless photo storage, consider keeping PNG or TIFF originals in your archive and exporting JPG copies for web and sharing.