Image Converter

About converting between image formats

Different image formats (PNG, JPEG, WebP) make different trade-offs between file size, quality, and features — PNG supports lossless quality and transparency but produces larger files, JPEG achieves small file sizes through lossy compression well-suited to photos, and WebP offers modern compression that often beats both. This tool converts multiple uploaded images at once to whichever of these three formats you need, entirely in your browser.

How the conversion works

Each uploaded image is drawn onto an HTML canvas element, which decodes it into raw pixel data regardless of its original format, and then the canvas re-encodes that pixel data into your chosen output format using your browser's built-in image encoding support. For JPEG and WebP, you can adjust a quality slider (0.1 to 1.0) that controls the lossy compression level, trading file size against visual fidelity, while PNG output is always lossless with no quality setting needed.

Frequently asked questions

Will converting a JPEG to PNG restore any quality lost in the original JPEG compression?

No — once JPEG's lossy compression has discarded image detail, that information is permanently gone. Converting the result to PNG afterward just losslessly preserves whatever quality remains in the JPEG; it can't recover data that JPEG compression already removed.

Why would I choose WebP over JPEG or PNG?

WebP generally achieves smaller file sizes than JPEG at equivalent visual quality, and unlike JPEG, it also supports transparency like PNG — making it a strong default choice for web use, though it has slightly less universal compatibility with very old software than JPEG or PNG.

Are my images uploaded to a server during conversion?

No. All decoding and re-encoding happens locally in your browser using the canvas API — your original image files are never uploaded anywhere, which is why this tool can process multiple images without any file size or privacy concerns tied to server uploads.