How to use Image Format Converter
- Select your images in the Images box, up to 20 at a time.
- Choose PNG, JPEG or WebP in Convert to.
- Set the quality if you chose JPEG or WebP, and a background color if you chose JPEG.
- Select Convert, then download the ZIP of converted files.
Example: Image Format Converter
Convert a PNG image to JPEG.
Options
- Convert to
- All images in one run go to the same format. PNG and WebP keep transparency; JPEG cannot, so choose it only for images with no transparent areas.
- Quality for JPEG and WebP
- Sets the encoder quality from 0.5 to 1, with 0.9 as the default. PNG output is lossless and ignores this setting entirely.
- Background for JPEG
- JPEG cannot store transparency, so any transparent pixel is filled with this color before encoding. Enter a six-digit hex value such as #ffffff. Ignored for PNG and WebP.
- Accept only
- In More options, limit the source format when a batch must contain only JPEG, PNG or WebP. The default accepts all three, and the tool checks the file content rather than trusting its name.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
What each format can and cannot keep
The three formats make different trades. JPEG compresses aggressively and stores no transparency, which suits photographs but shows blockiness at low quality settings. PNG stores every pixel exactly and supports partial transparency, which suits screenshots, logos and cut-out backgrounds, but the files are larger. WebP supports transparency and is another option, though older software may not open it. A conversion is not just a name change: a photo moved to PNG keeps the detail that JPEG already lost, and a logo moved to JPEG can gain gray fringes where the transparency was.
Questions about Image Format Converter
Why is my new PNG bigger than the JPEG I started with?
PNG is lossless and stores every pixel without discarding detail, so photographs usually grow when they move to PNG. If you wanted a smaller file, re-encode the image as JPEG instead.
Can I convert HEIC photos taken on my phone?
No. Browsers do not decode HEIC reliably, so the tool refuses the file rather than producing a broken image. Export the photo as JPEG first.
What happens to transparent areas when I convert to JPEG?
They are filled with the Background for JPEG color, white by default. The transparency is gone for good in that file, so keep the PNG or WebP original if you need it.
Can I convert each image to a different format in one run?
No. Convert to applies to the whole batch, so split the images into groups when you need a mix.
Will converting a JPEG to PNG improve the quality?
No. The detail JPEG removed when it was saved is already gone. PNG can only preserve what the JPEG still contains.