JPG to PNG

Select a JPEG file and process it without a quality setting. Inspect the measured output size; PNG can be larger, especially for detailed photographs. The file is a newly encoded PNG, while your original JPEG remains unchanged.

Choose one file using the file picker. The control shows the accepted input format and limits. A filename alone is not enough: the tool checks image bytes and then asks a decoder to open them. A damaged file or unsupported encoding produces a visible error instead of a downloadable file with a misleading extension.

Click Process image after setting the controls. Wait for the processed preview and the measured dimensions and bytes. Changing an input clears the previous result, so an old download is not presented as if it belonged to new settings. While a conversion is in progress, the interface shows that state rather than displaying an invented percentage.

A 1920 × 1080 JPEG remains 1920 × 1080 after conversion. Its existing white background remains white, and any visible JPEG artifacts remain part of the decoded image. A larger PNG file does not mean the image has gained new detail.

Use a copy of a familiar image for your first check. A picture with text near an edge, a recognizable orientation and some fine detail makes changes easier to notice. Compare the downloaded file, not only its thumbnail, because a small preview can hide artifacts or a changed border.

Saving decoded JPEG pixels in PNG avoids a further JPEG lossy-encoding pass during this particular save. However, the source was already a JPEG. Conversion cannot infer the original camera data, restore deleted metadata or distinguish an actual background from the subject automatically.

Pixel dimensions, encoding format and file size are separate properties. A file can keep the same dimensions and change size after encoding; a smaller pixel grid can still produce a larger file in another format. The component reports dimensions and actual bytes so you do not have to infer one property from another.

This workflow produces a single rendered still. It is not a multi-frame editor, an archival photo export or a metadata-preservation tool. Keep the original file when you need camera metadata, an animation, a depth image or the original color and HDR information. A successful download means the stated output was encoded, not that every source-container feature survived.

Open the download in the application that will receive it. Confirm the file format, dimensions, orientation and visible background. If the destination has a byte limit, compare the exact byte count rather than relying on a rounded “KB” label. A requirement can also include minimum dimensions and an accepted-format list.

PNG supports transparency, but a JPEG source normally supplies an opaque bitmap. Choosing a format with alpha support does not by itself create transparent pixels. Use a separate, explicitly capable editing workflow if you need to select and remove a background.

Do not overwrite the only copy of a source image. The download receives a new filename ending in -kepo and the actual output extension. If you compare multiple settings, retain enough of the input and setting information to reproduce the preferred version. Repeated lossy saves from already modified copies can make comparison less reliable.

The image-processing code does not upload the selected file. Decoding, drawing and encoding run on your device, and the download is a browser-created local object URL. The page and any required decoder code still need to load normally; local file processing does not mean the website itself makes no network requests.

Files must be non-empty and at most 20 MB. Decoded images and output canvases are limited to 24 megapixels, with no side larger than 16,384 pixels. These checks reduce excessive memory use but cannot guarantee that every device will handle every file below the limits. Large or complex HEIC files can require substantial memory while decoding.

If decoding fails, try a known supported still image or export the source from an application that can open it. If encoding is unavailable, the tool does not silently substitute another output format. A failed run clears the previous result. The original file on disk is not changed by the attempt.

For occasional edits, this browser tool can provide a quick, local step before sharing an image. For repeated work, keep an original, record the required output dimensions and format, and check one finished sample in the actual destination before repeating the operation across more files.

Kepo offers Mac desktop widgets and small personal workflows. The download link opens the app download page; it does not import your image, transfer this page’s settings or create an image-processing widget automatically. This online result remains a separate downloaded file.