Format choice can matter more than a small quality tweak
JPEG, WebP and AVIF are often efficient for photos, while PNG is useful for graphics and transparency. Choose a format for the content first, then fine-tune quality.
Free browser tool
Convert multiple images to JPEG, PNG, WebP, or AVIF and optionally download a ZIP.
Convert multiple images to JPEG, PNG, WebP or AVIF in one run. Download files individually or package the converted results into one ZIP.
PNG is lossless, so the quality number does not behave like JPEG quality. Converting a transparent image to JPEG also cannot preserve transparency.
JPEG, WebP and AVIF are often efficient for photos, while PNG is useful for graphics and transparency. Choose a format for the content first, then fine-tune quality.
Each file must be decoded and re-encoded locally. Very large batches can consume substantial memory, so the tool caps one run at 50 files.
The ZIP option bundles the already converted images into one download. It does not change the visual quality setting or re-encode the images again.
The browser creates new output files. Keep the originals, compare size and appearance, and only use the converted set once the result looks right.