Image Converter

This image converter changes the file format without uploading the picture. Pick a target format, set the quality for lossy formats, and download the converted file; transparent areas become white in JPEG.

Your data is processed locally in your browser and is not uploaded to our server.

or drop an image here

JPEG · PNG · WebP · GIF · max 20 MB

How to use this tool

1 Choose or drop a JPEG, PNG, WebP or GIF image.
2 Select the target format: JPEG, PNG or WebP.
3 Adjust the quality for JPEG or WebP; PNG stays lossless.
4 Download the converted image when the preview and size look right.

Formula and calculation logic

Re-encoding

Output = encoder(canvas(image), format, quality)

The picture is drawn onto a canvas and encoded in the target format. The canvas supplies the pixels; the encoder decides how they are stored.

Transparency

JPEG has no alpha channel

JPEG cannot store transparency, so transparent pixels are composited onto white. PNG and WebP preserve the alpha channel.

Worked example

PNG to JPEG

A screenshot needs to be smaller for an email.

Choose the PNG file
Select JPEG and quality 85
Download the smaller file

Sharp text may soften and transparency becomes white, but the file is usually much smaller.

JPEG to WebP

A photo should load faster on a website.

Choose the JPEG
Select WebP and quality 80
Compare the size

WebP often produces a smaller file than JPEG at similar visual quality and keeps transparency when present.

Edge cases and accuracy

Transparency to JPEG

Transparent pixels are painted white before encoding. Choose PNG or WebP when the background must stay transparent.

Repeated conversion

Every lossy conversion loses a little quality. Convert from the original file rather than from an already compressed copy when possible.

Animated images

Only the first frame of an animated GIF is converted. Animation is not preserved by a canvas-based converter.

Frequently asked questions

Which format should I choose? +

WebP is a good default for photos and web use. JPEG is universally compatible. PNG is best for screenshots, line art and transparency.

Does converting reduce quality? +

JPEG and WebP are lossy at typical quality settings; PNG is lossless. Converting to PNG from JPEG cannot restore detail that was already lost.

What happens to transparency? +

PNG and WebP keep it. JPEG has no alpha channel, so transparent areas are filled with white.

Is my image uploaded? +

No. Conversion happens entirely in your browser; the image never leaves your device.

Can I convert an animated GIF? +

The converter processes the first frame only. Use a dedicated animation tool if you need to keep the frames.