PDFConvertersOnline.comHow to convert images
- Add your images. Mixed formats in one batch are fine.
- Choose the output format and adjust quality or background if shown.
- Convert and save the new files one by one or as a single ZIP.
Which formats can you convert?
Input: JPG/JPEG, PNG, WebP, AVIF, HEIC/HEIF from iPhones and iPads, GIF, BMP and SVG, plus other formats your browser happens to support. Output: JPG, PNG, WebP or AVIF. You can mix inputs freely: an iPhone photo, a PNG screenshot and a WebP saved from a website can all become JPGs in the same run.
Choosing the right output format
| Format | Best for | Transparency | File size | Compatibility |
|---|---|---|---|---|
| JPG | Photos to share, email, print or upload | No | Small | Everywhere |
| PNG | Screenshots, logos, graphics, editing copies | Yes | Large for photos | Everywhere |
| WebP | Images on websites | Yes | Smaller than JPG | All current browsers, most newer apps |
| AVIF | Web images where size matters most | Yes | Smallest | Current browsers; many apps not yet |
A simple rule of thumb: JPG if the image is a photo and needs to work anywhere; PNG if it has text, sharp edges or transparency; WebP or AVIF if it's going on your own website and you want it to load quickly.
Settings explained
- Quality (JPG, WebP, AVIF): lower numbers give smaller files and more visible compression. Defaults are 90% for JPG, 85% for WebP and 60% for AVIF, which each look close to the original. PNG is lossless, so it has no quality setting.
- Background (JPG only): JPG can't hold transparent pixels, so see-through parts are filled with this color. White by default.
- SVG width: appears when you add SVG files. Vector drawings have no pixel size, so you choose how many pixels wide the result should be.
Things conversion can't do
Changing format never adds detail that isn't there: a blurry JPG saved as PNG is still blurry, just bigger. Animated GIF and WebP files become a still image of their first frame. Metadata such as camera model, date and GPS location is not carried into the new files. Width and height stay the same; to change them, use Resize Image, and to reach a particular file size, use Compress Image.
Speed notes
JPG, PNG and WebP are created by your browser's built-in encoders and are nearly instant. HEIC photos take a few seconds each to decode, and AVIF output takes longest because the encoder does a lot of work to produce such small files. Everything runs on your device, and no image is uploaded to a server at any point. Raster images keep their exact pixel dimensions; only SVG files get a size, set with the SVG width option.
Frequently asked questions
Can I convert different formats in one batch?
Yes. Every file is converted to the output format you choose, whatever its original type.
Which format gives the smallest file?
Usually AVIF, then WebP, then JPG. PNG is the largest for photos but can be small for simple graphics.
What happens to transparent backgrounds?
They are kept in PNG, WebP and AVIF. In JPG they are filled with the background color you pick.
Can I convert to GIF, BMP or TIFF?
Not currently. The converter saves JPG, PNG, WebP and AVIF, which cover almost every modern use.
Does the converter work offline?
Once the page has loaded, conversion needs no connection for JPG, PNG and WebP. HEIC and AVIF need their decoder or encoder loaded, which happens the first time you use them.
Why is my converted file bigger than the original?
Moving to a less efficient format, such as WebP or AVIF to JPG, or any photo to PNG, normally produces a larger file. That is expected; it trades size for compatibility or lossless quality.