JPG to PNG
Convert a local JPEG image into a PNG download in the browser. The visible pixels are decoded and re-encoded; PNG does not restore detail already removed by JPEG compression, but it can be useful when a PNG workflow or lossless subsequent edits are required.
Runs locally — files stay on your deviceDoes JPG to PNG improve quality?
No. PNG preserves the pixels decoded from the JPEG but cannot restore detail already lost to JPEG compression.
JPEG and PNG serve different image needs
JPEG typically compresses photographic pixels with loss, while PNG uses lossless compression and supports transparency. Converting changes the container and encoding, not the historical quality of the source.
How it works
The browser decodes the JPEG into a bitmap, draws it to canvas, and exports PNG. The new file contains rendered pixels rather than the original JPEG bitstream.
When to use it
- Provide an asset to software that requires PNG.
- Avoid another lossy generation before editing.
- Standardize screenshots and interface assets as PNG.
When not to use it
- Do not expect a smaller file for photographs.
- Do not expect lost JPEG detail to return.
- Do not expect transparent areas to appear automatically.
Worked examples
Product photo
- Input
product.jpg- Expected output
product.png
Pixels remain visually similar but PNG may be larger.
Legacy upload
- Input
scan.jpeg- Expected output
scan.png
The file becomes acceptable to PNG-only workflows.
Editing handoff
- Input
reference.jpg- Expected output
reference.png
Further saves can remain lossless after conversion.
Common mistakes
Expecting quality recovery
JPEG artifacts are already part of decoded pixels. Correction: Return to an original lossless source when available.
Assuming PNG is always smaller
Photographic content often compresses better as JPEG. Correction: Compare outputs for the intended use.
Assuming transparency is created
JPEG has no alpha channel to recover. Correction: Remove or edit the background separately.
Related operations and differences
PNG to JPG
That conversion removes alpha support and applies lossy photographic compression.
PNG to WebP
WebP may offer smaller web delivery with browser-dependent encoding.
Limitations and privacy
- Metadata is generally not carried through canvas export.
- PNG output may be substantially larger.
Processing uses browser APIs on this device; the entered content is not sent to the Toolbox server.
Frequently asked questions
Will PNG improve JPEG quality?
No. It preserves the already decoded pixels without reversing earlier loss.
Can the output be transparent?
The PNG format supports alpha, but conversion alone does not invent transparency.
Why is the PNG larger?
Lossless PNG is often less efficient than JPEG for photographs.
Is metadata preserved?
Canvas-based export generally creates a fresh file without original EXIF metadata.