JPEG vs PNG vs WebP is a choice about the picture in front of you, not a ranking of file extensions. A photograph of a street and a logo with a transparent edge fail in different ways when you pick the wrong container. JPEG throws away detail to stay small and cannot store transparency. PNG keeps a predictable grid of pixels and can store transparency, and it is often the heavy file when the picture is a photo. WebP can carry a photo or a graphic, including transparency in some encodings, but a page that writes WebP through the browser only succeeds when that browser can encode it.
YallaSolve converts among these three with the Image Format Converter. The conversion draws the decoded bitmap on a canvas and encodes again. That is not a lossless byte copy, even when the target is PNG. If the file is already the right type and only the pixel count is wrong, the Image Resizer is the closer tool. If the pixel count is fine and you want a new JPEG or WebP encoding, the Image Compressor is the closer tool. Neither one invents a fourth format.
JPEG is built for continuous tone: skin, sky, foliage, a product on a soft background. The encoder keeps an approximation of those gradients. Flat text, a one-pixel line, and a hard logo edge are where JPEG artifacts show up as halos and blockiness. JPEG also has no alpha channel. A transparent PNG sent through a JPEG encode becomes an opaque image. On a canvas, the transparent pixels are filled; you should not expect the checkerboard to survive.
A second JPEG pass is another lossy generation. If a camera file is already a tight JPEG, asking for a high quality may not shrink it, and asking for a low quality will shrink it by damaging the picture. The compressor on this site reports both sizes so you can refuse a result that grew or that looks worse. Quality is the browser’s encoder argument. It is not a promise of a particular kilobyte count.
PNG is the practical choice for screenshots, interface icons, diagrams, and any asset whose edge must stay crisp or whose background must stay transparent. It stores pixels without the JPEG-style quantization that smears type. It can be large. A full-page screenshot saved as PNG is often the file a form rejects for size, which is a reason to resize the pixel grid or to accept a JPEG if the text can tolerate it.
A PNG written by the format converter is a new PNG from canvas pixels. It is not the original file with a new name. Metadata such as EXIF is not carried along, because the canvas has no metadata channel. If you needed the original bytes unchanged, do not convert. If you needed those bytes as text, that is a different job from a format change.
WebP is widely used for photos and for graphics on the web. It can be lossy, and some WebP files keep an alpha channel. On YallaSolve, WebP output exists only when the browser can encode WebP from the canvas. If it cannot, the converter reports the failure instead of writing a file with a .webp name and JPEG bytes inside. The same quality slider that applies to JPEG applies to WebP here. It does not mean the result is visually identical to the source, and it does not mean the file will be smaller.
A WebP that a desktop app cannot open is a reason to convert to PNG, not a reason to claim WebP is invalid. The bytes are still an image if they sniff as WebP. The limitation is the other program.
The converter accepts JPEG, PNG, and WebP only, and it sniffs the file instead of trusting the extension. SVG, GIF, HEIC, AVIF, and BMP are refused. Files over 8 MB, an edge over 8,000 pixels, or a bitmap over 16 megapixels are refused. The work stays in the browser.
Use JPEG when the picture is a photo and transparency does not matter. Use PNG when the edge or the transparent background matters more than a smaller file. Use WebP when the page you are shipping already serves WebP and you have checked the encoded result in this browser. If you still need fewer pixels after that choice, resize. If you need fewer bytes at the same pixel size, compress, and keep the original when the new file is not actually smaller. The guide to compression versus resizing is the procedure for that second decision.
JPEG vs PNG vs WebP does not end in a single winner. It ends when the container matches the picture and you have accepted what a new encode throws away. Convert when the destination asked for a different type. Leave the file alone when it is already that type and you only disliked the extension.
No. A WebP from a browser canvas can be smaller or larger than the file you started with. The encoder and the quality setting decide.
No. JPEG has no alpha channel. Transparent pixels become opaque.
No. The page decodes pixels and writes a new PNG. It is not a byte-for-byte copy, and EXIF is not kept.
A logo with a hard edge or a transparent background usually belongs in PNG. A photograph usually belongs in JPEG or WebP.
