Image Format Converter
Convert images between PNG, JPG, and WebP — with a quality slider and before/after file sizes.
Your file never leaves your device — all processing happens in your browser.
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How to use the image format converter
- Choose an image from your device — JPG, PNG, WebP, GIF, and BMP all work.
- Pick the target format: PNG, JPG, or WebP.
- Adjust the quality slider (applies to JPG and WebP).
- Download the converted file and compare sizes.
Image format tips
Pick the format for the job: PNG for graphics with sharp edges, text, or transparency; JPG for photographs where small artifacts do not matter; WebP for the best of both on the modern web — typically 25–35% smaller than JPG at the same visual quality. The quality slider is the real lever: dropping JPG from 100 to 85 usually halves the file size with no visible difference, and 70–80 is the sweet spot for web photos. One caution: converting JPG to PNG does not restore quality — it just makes a bigger file holding the same artifacts. Always convert from your highest-quality original, and keep a master copy before batch-converting anything important.
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Frequently asked questions
Which format is smallest?
Usually WebP, then JPG, then PNG. For photos at quality 85, WebP is often a third smaller than JPG.
Does it keep transparency?
Yes when converting to PNG or WebP. JPEG does not support alpha transparency, so transparent areas are flattened to a white background when converting to JPG.
What is WebP and should I use it?
WebP is a modern image format that produces files roughly 25–35% smaller than JPEG at the same visual quality. Use it for websites; every current browser supports it.
Is my image uploaded?
No. Conversion runs entirely on your device; nothing is sent anywhere.