How to convert image formats locally

Format conversion is a new local encoding of the same picture, not an upload to a conversion server. The tool is https://msh.zone/image/convert, inside PicZero. MSH does not receive the image, and there is no account.

What each output is for

The convert page writes JPG, PNG, WebP, and AVIF. The default selection is WebP, and the default quality is about 85%.

• JPG is the most widely accepted format for photographs and for forms that only allow JPG. It has no transparency.
• PNG fits interface shots, screenshots, and anything that must stay transparent. It is usually the largest. To shrink it, see compress locally, where PNG can quantize its colors.
• WebP is a practical default for many web pages. It is often smaller than JPG at a similar look, and it can keep transparency.
• AVIF is usually smaller still on a page you control. Older browsers may be unable to encode or display it. The page marks formats this browser cannot encode.

Read the receiver's rule before you pick. If a shop admin says "JPG, under 200 KB", conversion only solves the format. The size belongs to the compress page's target field.

Quality and transparency

Quality on a lossy format is how hard the new encode compresses. It is not a sharpness repair. For a first conversion, 85% is a practical start. Look at the first file's size and at diagonals or text, then run the rest. If the source is already a heavily compressed JPG, saving it again at a high quality often makes it larger, because you are encoding a lossy result one more time.

When the output is JPG and the picture has transparency, you can flatten onto a background. The default color is white. That is usually right for a product shot, an avatar, or an icon that will sit on white. If you need the transparency, do not choose JPG. Use PNG or a WebP that keeps alpha.

A batch, and what to do next

A folder is a list of files the page is allowed to read, not an upload. Quality, format, flatten color, and rename rules apply to every image in the list. Check one, then run the others. Several results download as converted-images.zip. The originals on disk stay as they were.

How to keep one setting from ruining a whole folder is covered in a folder of photos. If the job is removing a background rather than changing the format, use cut out locally and export PNG or WebP so the transparency survives.