Unuploaded

Converter · No upload

Convert JPG to PNG on your device

Choose JPGs and download lossless PNGs.

The sample is a 240×120 JPG made in this tab. Its PNG adds no further compression loss, and the result row shows the input and output sizes to compare.

Read here — Statusidle Files— OutputPNG Network since file read—

Undecodable JPGs fail, with browser reasons where available, and so do images too large for the browser’s canvas, which are not shrunk to fit. One PNG per file, written as 8-bit sRGB pixels; the file usually grows, several-fold on photographs. EXIF, GPS and timestamps are removed, and an embedded colour profile is not carried. Takes .jpg and .jpeg.

How this converter works

The browser reads the selected JPG into memory and decodes it into pixels. A canvas then encodes those pixels as a lossless PNG, which the page offers as a Blob download. No extra library or network transfer is needed to convert the file.

To check for uploads yourself, press F12 to open your browser’s developer tools, select the Network tab and run a conversion, then see whether any new requests appear. JPG and PNG support is built into the browser, so this tool has no decoder or encoder download to account for. The methodology page describes two other checks and the limits of the site's own meter.

Keep the original JPG. The PNG cannot recover detail lost to JPG compression, and later editing, resampling or colour conversion can still change its pixels. The PNG also leaves out the photo’s EXIF metadata, including GPS location, camera model and timestamps, so note the capture date before converting if you need it.

Frequently asked questions
Is my image uploaded anywhere?
No. The browser decodes the JPG, redraws it on a canvas and encodes the PNG in this tab. The network meter counts the resource-timing entries logged after the first file is read; earlier page loads and WebSocket traffic are not counted. The methodology page explains two separate checks: the browser’s network panel and an offline test.
Will converting to PNG improve the quality?
No. Detail that JPG encoding discarded is gone, and PNG cannot restore it; the PNG only avoids adding another lossy compression step. Keep the best original you have.
Why is the PNG so much bigger than my JPG?
PNG compresses without loss, and photographic detail and sensor noise often take more space that way than in a lossy JPG, so a photo can grow several-fold. The exact size depends on the image. PNG is a good choice for sharp text, screenshots and diagrams, where avoiding compression artefacts matters.
Does the PNG get transparency?
No. Ordinary JPG files have no alpha channel, so the PNG comes out opaque, and no background is removed. PNG supports transparency, but changing the format does not create it.
Is the photo's EXIF data kept?
No. The canvas conversion does not copy the JPG’s EXIF, so GPS location, camera model and capture timestamps are left out. The PNG encoder can still write its own format metadata. Save any original metadata you need before converting.

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