Image Format Converter

Convert images between JPG, PNG, and WebP with adjustable quality. All conversion happens locally in your browser — your photos are never uploaded.

Convert screenshots, photos, and graphics into the format a website, form, or app requires — without uploading your images to a conversion server.

How to use Image Format Converter

Upload your image by dropping it or selecting from your device
Choose the output format (JPG, PNG, or WebP)
Adjust the quality slider for JPG or WebP output
Click "Convert Image" and download the result

Which format to convert to

This tool outputs JPG, PNG, or WebP. JPG is the right default for photographs and produces the smallest files, but it cannot store transparency and it is lossy. PNG is lossless and supports transparency, which makes it correct for logos, icons, screenshots, and anything with sharp edges or text, at the cost of a much larger file.

WebP is usually the best of both for the web: noticeably smaller than JPG at comparable quality, with transparency support. Every current browser reads it. Its main drawback is that some older desktop software and a few printing workflows still will not open it.

Quality and what it applies to

The quality slider runs from 0.1 to 1.0 and defaults to 0.9. It only affects lossy output — JPG and WebP. Converting to PNG ignores it entirely, because PNG encodes losslessly, which is also why converting a photo to PNG often produces a file larger than the original.

Converting between lossy formats compounds loss. Going JPG to WebP re-encodes already-degraded data, so start from the highest-quality source you have rather than from an export.

Transparency, and where it goes

Converting a transparent PNG or WebP to JPG discards the alpha channel, because JPG has no way to represent it. Transparent regions become solid, which is usually not what you want for a logo. Convert to WebP instead if you need both a smaller file and transparency.

Questions

Can I convert HEIC photos from my iPhone?: Only if your browser can decode HEIC, which Safari on Apple devices generally can and most desktop browsers cannot. Where it is unsupported the file will not load. Exporting as JPEG from the Photos app first is the reliable route.
Why did my PNG get bigger after converting?: PNG is lossless, so a photograph re-encoded as PNG stores every pixel exactly and typically grows several times larger than the JPG it came from. That is expected. Use PNG for graphics and text, not photos.
Does converting change the image dimensions?: No. Conversion changes only the encoding. Pixel dimensions are preserved — use the resize tool if you need to change them.