Private convert tool
JPG PNG WebP Converter
Switch common image formats without sending files away. Processing stays in your browser.
More file tasks
Compare JPG, PNG and WebP for listing photos, transparent artwork, downloadable printables and web previews.
How it works
A useful result,
without the upload.
Convert JPG, PNG and WebP images entirely in the browser, with transparent-background handling and adjustable quality. The file is decoded and processed inside this browser tab, so File Preflight never receives its contents.
Worked example
Convert a transparent PNG to WebP for a smaller web preview, or flatten it to white for a JPG export.
How to use the JPG PNG WebP Converter
- Choose an image file to load it into the converter.
- Select your desired output format from the dropdown (JPG, PNG, or WebP).
- Adjust the quality slider (35-100%) - higher values create larger files with better detail.
- For JPG output, the quality setting controls compression level.
- For WebP, the slider controls lossy quality; for PNG it is disabled because PNG export is lossless.
- Click the convert button to download the processed image.
- Compare the original and converted file sizes in the status message.
What happens under the hood
Images are decoded locally via the browser's Image API, then re-encoded using the Canvas API with your selected format and quality settings. The conversion happens entirely in your browser, with transparent backgrounds preserved for PNG and WebP formats. The final file is downloaded directly to your device without any server processing.
Before you send the file
- JPEG does not support transparency, so transparent pixels are placed on white.
- Repeated lossy conversion can reduce quality.
- Color profiles and some metadata may not be preserved by browser canvas export.
Frequently asked questions
Why can't I convert to JPEG with transparency?
JPEG format doesn't support transparency. When converting transparent images to JPEG, the transparent areas are filled with white background.
What quality setting should I use for web images?
80-85% quality balances file size and visual quality well for most web use. Higher values (90+) preserve more detail but increase file size significantly.
Will converting reduce my image quality?
JPEG and the browser's WebP export can be lossy. PNG preserves the decoded canvas pixels, but cannot restore detail already lost in the input. Keep the original file; color profiles and metadata may change even when exporting PNG.
Are color profiles preserved during conversion?
Browser canvas export may not preserve color profiles. For print work, keep an original file with embedded profiles and use professional software.
Keep an untouched original and inspect the downloaded file before replacing any production asset. Closing this tab removes the selected files from the tool.