JPG vs PNG vs WebP: Which Image Format to Use and How to Convert
JPG, PNG or WebP? Compare compression, transparency, file size and compatibility, then convert images in your browser for free without uploading anything.
You save an image, try to upload it, and the form says “unsupported file type.” Or you shrink a logo and its clean edges turn fuzzy. Or a screenshot ends up five times larger than you expected. Most of these problems come down to one choice: the image format.
This guide is for anyone who works with images, whether you post photos, build web pages, fill in online forms or send screenshots to coworkers. It explains how JPG, PNG and WebP differ, when to use each one, and how to convert between them in your browser. Your files are never uploaded.
The three formats in plain terms
All three formats store a grid of colored dots (pixels). They differ in how they shrink that data so the file takes up less space. This is called compression.
- Lossy compression throws away detail the eye is unlikely to notice. Files get much smaller, but each lossy save loses a little quality.
- Lossless compression packs the data more tightly without throwing anything away. When you open the file again, every pixel is exactly as it was.
JPG (also written JPEG) is lossy and has been the standard photo format for decades. PNG is lossless and supports transparency. WebP is a newer format built for the web. It can be lossy or lossless and also supports transparency.
Comparison table
| JPG | PNG | WebP | |
|---|---|---|---|
| Compression type | Lossy | Lossless | Lossy or lossless |
| Transparency | No | Yes | Yes |
| Typical file size | Small for photos | Large for photos, small for simple graphics | Usually the smallest of the three |
| Compatibility | Works almost everywhere | Works almost everywhere | Modern browsers yes; some older apps and upload forms no |
| Best for | Photos, scanned pictures | Logos, icons, screenshots, images with text, anything that needs a see-through background | Images on websites where loading speed matters |
| Weak spot | Blurry edges around text and sharp lines; no transparency | Very large files for photos | May be rejected outside the browser |
Which one should you pick?
Use JPG for photos. Photos have smooth gradients and lots of fine detail, and lossy compression handles that well. At a reasonable quality setting, most people can’t see the difference, and the file is a fraction of the size of a PNG.
Use PNG for logos, screenshots and transparency. Text, thin lines and flat areas of color stay perfectly sharp in PNG. JPG tends to add faint smudges around those edges, called “artifacts.” If your image needs a transparent background, for example a logo placed over a colored banner, PNG is the safe choice.
Use WebP for web pages. If you control a website and want pages to load quickly, WebP usually gives you smaller files at similar visual quality. It can replace both JPG (lossy mode) and PNG (lossless mode with transparency).
When in doubt, think about the destination. If the file is going to an unknown app, an email recipient or an official upload form, JPG or PNG is the safer bet because nearly everything accepts them.
Why some apps reject WebP files, and how to fix it
Browsers often save images from websites as WebP, because that’s what many sites serve. The file looks fine on your screen, but then:
- an older photo editor or office program won’t open it,
- a job application, government portal or marketplace listing says the file type isn’t allowed,
- a printing service asks for JPG or PNG only.
The fix is simple: convert the WebP file into a format the destination accepts. Use JPG if the image is a photo, or PNG if it has text or sharp graphics or needs to keep a transparent background. Renaming the file extension from .webp to .jpg does not work. The data inside is still WebP, and many programs will notice and refuse it, or show an error.
What happens to transparency when you convert PNG to JPG
JPG has no way to store transparency. When you convert a PNG with a see-through background to JPG, the transparent areas have to be filled with a solid color, usually white or black depending on the tool (Deftivo’s converter uses white). A logo that looked clean on a transparent background may suddenly sit inside a white box.
If you need the transparency, stay with PNG or use WebP. Convert to JPG only when a solid background is acceptable, for example when the image will always appear on a white page.
Converting GIF and BMP files
You may also come across two older formats:
- GIF is mostly known for short animations, and it is limited to a small number of colors. Converting a GIF to PNG or JPG gives you a still image, usually the first frame, so any animation is lost.
- BMP is an old Windows format that stores images with little or no compression, so files can be very large. Converting a BMP to PNG keeps every pixel and usually shrinks the file a lot. Converting it to JPG shrinks it even more if the image is a photo.
How to convert images with Deftivo
The Deftivo image converter runs entirely in your browser. Your images are processed on your own device and are not sent to a server.
- Open the JPG/PNG converter.
- Select the images you want to convert. You can add more than one file at a time.
- Under Convert to, choose PNG, JPG or WebP.
- If you chose JPG or WebP, set the JPG / WebP quality slider. Higher quality means a sharper image and a larger file. Lower quality means a smaller file with more visible compression.
- Click Convert.
- Download the results. A single image downloads automatically. If you converted several files, download each one or click Download all (ZIP) to get them together.
If your main goal is a smaller file in the same format rather than a different format, the image compressor is the better tool.
Photos from an iPhone? iPhones often save photos as HEIC, a format many Windows programs and websites don’t accept. Deftivo has a separate HEIC to JPG converter for these files.
Tips and pitfalls
- Keep your originals. Converting to JPG or lossy WebP loses some detail. Work from the original file each time instead of re-saving the same JPG over and over.
- Converting to PNG won’t restore quality. If a JPG is already blurry, saving it as PNG gives you a bigger file with the same blur.
- Don’t push quality to the very bottom. Very low settings cause blocky patches and color banding. Try a middle setting first, check the result, and adjust.
- Screenshots belong in PNG. Saving a screenshot as JPG often makes text look smudgy.
- Check the upload rules. Many forms list allowed formats and a maximum file size. Match the format first, then compress if the file is still too large.
- Expect a background behind transparency. Any PNG-to-JPG conversion will fill transparent areas, so preview the result before you send it.
FAQ
Is WebP better than JPG?
For web pages, WebP often produces smaller files at similar visual quality, and it supports transparency. However, JPG works in far more apps and upload forms. Use WebP on your own website and JPG when you share files with other people or services.
Will converting JPG to PNG improve image quality?
No. Converting to PNG keeps the image exactly as it is now, including any blur or compression artifacts. The file usually just gets larger. PNG only helps if you plan to edit the image further and don’t want to lose more quality.
Why did my transparent background turn white?
You probably converted the image to JPG, which can’t store transparency. The converter had to fill the empty areas with a solid color. Convert to PNG or WebP instead if you need to keep the background transparent.
Are my images uploaded when I use Deftivo?
No. Deftivo’s tools process images directly in your browser, so your files stay on your device. This makes them a good fit for personal photos, work documents and anything else you’d rather not send to a server.