A screenshot can turn fuzzy around the lettering after a JPG export. A logo can lose its clear background. Before changing formats, decide what needs to survive: readable text, transparency, fine detail, or a smaller download. Keep the source and compare a copy before you send it.
Start with the picture
For a screenshot, diagram, or logo with sharp edges, try PNG first. PNG uses lossless compression and supports transparency, so it's a good starting point when you want to keep the decoded pixels without another lossy save. The PNG specification explains these properties.
For an ordinary photograph going into an app that asks for JPG, use JPG. It gives you a quality control in Image Converter, so you can compare the saved result with the original rather than guessing from the file extension. Look closely at hair, foliage, lettering, and shaded areas before accepting a lower setting.
For a picture going onto a website, try WebP alongside those two. The format supports both lossy and lossless compression, and transparency can work in either mode. Lambda Guru's Image Converter uses the browser's WebP quality setting and doesn't offer a separate lossless WebP mode. Google's WebP overview describes the format's compression and transparency support.
| What you need | Try first |
|---|---|
| Crisp screenshot or diagram | PNG |
| Photograph for a form that requires JPG | JPG |
| Smaller website image with transparency | WebP, then inspect it |
| Transparent logo that must preserve decoded pixels | PNG |
These are starting points. The picture and the destination decide whether the result works. Keep your original while you compare copies.
Make a fair comparison
Open Image Converter, select Choose Image, and load one picture. The page converts it to PNG first. Under Convert to, choose another format and let the Converted Preview refresh. The two previews show resolution and file size, which makes the trade-off easier to judge.
For JPG or WebP, Output quality starts at 92% and can be adjusted from 10% to 100%. Try a modest change first. Compare the image at the size people will see it, then check any details that matter. A smaller file isn't useful if the product label or the text in your screenshot becomes hard to read.
Download the copy when it looks right. Image Converter adds -converted to its name, so garden.jpg becomes garden-converted.webp when you choose WebP. Open that saved file in the destination app as a final check. A preview in one browser can't tell you whether every other app will accept it.
Handle transparency before choosing JPG
JPG has no transparent background. Image Converter doesn't paint a background before saving JPG, so transparent areas can become black in its output. That matters for a cutout, a logo, or an image with empty space around the edges.
Choose PNG or WebP to keep transparency. If you need a JPG with a specific background color, SVG To Raster has a background color control for SVG inputs. For an ordinary image, check the output from whatever tool you use and make sure the filled background is the one you want.
Change dimensions when format isn't enough
Image Converter keeps the source width and height. Saving a very wide photo in a different format can reduce its file size, but it still leaves a very wide picture. Use Image Resizer when the image only needs to fit a smaller space. Use Image Optimizer when you want to work on file size without switching to a different format.
Changing the extension by renaming a file doesn't perform either job. The converter actually decodes the source and writes a new image. Its format menu also depends on what your browser can encode, so a format missing from the list isn't something you can enable by typing its name.
Keep the right original
Converting a damaged JPG into PNG won't restore detail that's already gone. It gives you a new file with the decoded picture you have. When you can, go back to the original photo or design for a fresh export instead of converting your smallest copy again.
The same Image Converter can read a GIF, but its output is a still image, not an animation. For a moving picture, use the animation tools instead. For an SVG that needs a particular pixel size, use SVG To Raster. All of these tools process the selected file on your device, and you choose when to save the finished copy.
Try a transparent sample
The transparency walkthrough includes a small graphic you can download and compare as PNG and JPG. Its empty corner makes the background change easy to spot. Before sharing a photo, the metadata walkthrough also shows how to inspect fields that aren't visible in the picture.