Does the image format converter upload my files?

No. Images are loaded, converted and encoded in your browser. Files are not sent to GleeTool's server.

Which image formats can I convert?

You can load JPG, PNG, WebP and GIF images, then export the result as JPG, PNG or WebP.

How does JPG image quality work?

JPG uses a 0% to 100% quality slider. Higher values preserve more detail and usually create larger files; lower values create smaller files.

What PNG compression levels are available?

PNG offers DEFLATE levels 1 Fast, 3 Low, 6 Standard and 9 Maximum. PNG compression is lossless, so the visual quality remains unchanged.

How does WebP compression work?

WebP offers Best quality, High quality, Balanced, Smaller file and Smallest file options. The preview and optimized size update when you change the option.

Can I compare the original and converted file sizes?

Yes. The Output card shows the original file type and weight beside the converted format and estimated optimized weight before download.

Free Online Image Format Converter

Free online image format converter for JPG, PNG, WebP and GIF files. Convert images in your browser, adjust JPG/WebP quality or PNG DEFLATE compression, compare original and optimized size, then download privately.

Open Tool How It Works

Image format converter

Drop an image here or choose a file from your device · PNG, JPG, WebP and GIF Browse image

Ready

Auto-process

Output

Optimizing preview…

Load an image or example.

Original—

Optimized—

Settings stay in this browser.

How to convert an image format online

Convert an image in three simple steps, compare original and optimized file sizes, and preview the result before downloading.

Upload an image

Choose a JPG, PNG, WebP or GIF image, or load the example to preview the converter.

Choose format and compression

Select JPG, PNG or WebP, then adjust JPG quality, WebP compression, or PNG DEFLATE level from 1 to 9.

Compare and download

Review the converted preview and compare original versus optimized size, then download the finished image.

Frequently asked questions

Does the image format converter upload my files?: No. Images are loaded, converted and encoded in your browser. Files are not sent to GleeTool's server.
Which image formats can I convert?: You can load JPG, PNG, WebP and GIF images, then export the result as JPG, PNG or WebP.
How does JPG image quality work?: JPG uses a 0% to 100% quality slider. Higher values preserve more detail and usually create larger files; lower values create smaller files.
What PNG compression levels are available?: PNG offers DEFLATE levels 1 Fast, 3 Low, 6 Standard and 9 Maximum. PNG compression is lossless, so the visual quality remains unchanged.
How does WebP compression work?: WebP offers Best quality, High quality, Balanced, Smaller file and Smallest file options. The preview and optimized size update when you change the option.
Can I compare the original and converted file sizes?: Yes. The Output card shows the original file type and weight beside the converted format and estimated optimized weight before download.

Ready to use Image Format Converter?

Fast, private, and runs directly in your browser without uploading any data.

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