Free Image Format Converter that works offline
Change a photo or graphic between common web formats without sending it to an image service. JPEG background color is configurable because that format cannot represent transparency.
What this image format converter does
The source is decoded, drawn at its original dimensions and re-encoded with Canvas. PNG is lossless, JPEG suits photographs without transparency, and WebP can provide efficient lossy or browser-defined output.
How to use the Image Format Converter
- Enter or paste a local browser-readable image and target format into the tool.
- Adjust the available options so they match the format and result you need.
- Choose Process image and review a converted PNG, JPEG or WebP download before using it.
- Copy or download the result, then clear the page if the input was sensitive.
Common uses
- Converting PNG screenshots to JPEG
- Creating WebP versions for testing
- Removing transparency with a chosen background
- Preparing a compatible format for another application
Private processing and offline access
This tool does not submit your input to a conversion server. Processing takes place inside the browser using local JavaScript and standard Web APIs. After the PWA has been installed or cached, the page and its core features remain available without an internet connection. Closing or clearing the page removes unsaved input; the tool does not create an account or cloud history.
Tips for accurate results
- Keep an original before lossy conversion.
- Use PNG for sharp transparency and interface graphics.
- Browser encoders may produce different file sizes at the same quality setting.
Frequently asked questions
Are files uploaded for conversion?
No. The selected file is decoded and re-encoded locally with browser image and Canvas APIs.
What happens to transparency in JPEG?
JPEG has no alpha channel, so transparent areas are filled with the selected background color.
Does conversion resize the image?
No. This tool keeps original dimensions; use the separate Image Resizer when dimensions should change.