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JPG to PNG Converter
Quick answer
Convert a JPEG into a lossless PNG when you need to stop further generation loss before editing, or before adding transparency to something that started life as a photo. It will not undo any quality the JPEG has already lost; it just stores exactly what is there from this point on.
What the jpg to png converter does
A common assumption about this conversion is wrong: turning a JPEG into a PNG does not restore detail the JPEG encoder threw away. JPEG is lossy, and whatever blur or blockiness is already in the pixels carries over exactly, just stored in a format that will not lose anything further. The output is usually noticeably bigger than the source JPEG, sometimes five to ten times bigger, since PNG cannot compress photographic noise the way JPEG can.
Where this genuinely helps: before editing in software expecting a lossless intermediate format, before cropping a section and adding a transparent background, or before several more edit-and-save cycles. Re-saving a JPEG as a JPEG each time compounds loss; re-saving as PNG between edits, exporting to JPEG only at the end, keeps that compounding to one generation instead of five.
It is worth being honest about when this is a wasted click: if you only need a slightly smaller file, or are not going to edit or add transparency, converting a JPEG to PNG just makes it bigger for no benefit.
How to use it
Upload the JPEG
Drag it in or click to browse. No background colour is needed since JPEG has nothing to flatten.
Confirm the conversion
PNG has no quality slider; the encode is always lossless, so there is nothing to tune here.
Download the PNG
Expect a larger file than the source JPEG. That size increase is the price of a lossless container, not a mistake.
Your images never leave your device
The re-encode happens entirely on your device, which matters when the JPEG is a phone photo of a signed contract or an NDA page snapped in a hurry that now needs to paste into a document requiring a transparent or lossless image. Nothing about that file touches a server in this workflow.
- No file is ever uploaded to a server
- Works offline after the first visit
- No account, no watermark, no limits
Format and quality tips
Do not round-trip back to JPEG unnecessarily
JPEG to PNG to JPEG loses more than converting JPEG to JPEG once, since the PNG step preserves every artefact from the first pass and a second lossy encode compresses that already-damaged data again. Keep the PNG step only if you are genuinely editing in between.
PNG-24 versus PNG-8
A photographic JPEG should become a full PNG-24 file, storing millions of colours. Do not run it through a PNG-8 palette reducer afterwards, since photos hold far more distinct colours than an 8-bit, 256-colour palette can, and banding will appear in gradients like skies.
Frequently asked questions
Does converting JPG to PNG improve image quality?
No. It stops any further loss from this point forward, but it cannot recover detail the JPEG encoder already discarded. The pixels are copied exactly as they are.
Why is my PNG bigger than my original JPG?
Because PNG is lossless and JPEG is not. Photographic detail that JPEG compressed away simply is not there to compress further, so PNG has to store every remaining pixel value exactly, which takes more space.
When should I convert JPG to PNG instead of keeping it as JPG?
When you plan to edit the image over several sessions, or need to add transparency to part of it. Keeping a lossless copy between edits avoids compounding JPEG generation loss.
Can I add transparency to a JPEG after converting it to PNG?
Yes, PNG supports an alpha channel that JPEG does not, so once converted you can cut out a background in an image editor and export with transparency intact.
Is JPEG to PNG conversion reversible?
The PNG itself is a perfect, lossless copy of the JPEG pixels, so converting it back to JPEG at a high quality will look almost identical, though it adds one more small generation of loss.
Why would I convert a JPEG to PNG if the file just gets bigger?
Because file size is not the only concern. Lossless storage during editing and support for transparency are both things a JPEG cannot offer, no matter how good the quality setting is.
Further reading
- WebP vs JPG vs AVIFJPG is universal, WebP is smaller and works everywhere that matters, and AVIF is smaller still but slow to make. Here is how to choose without guessing.6 min read
- PNG vs JPG: Which Should You Use?The rule is short: photographs go to JPG, anything with sharp edges or transparency goes to PNG. This post explains why, so you never have to guess again.6 min read
- What Is HEIC, and How Do You Open It?HEIC is why an iPhone photo will not open on a friend Windows laptop. Here is what the format is, why Apple chose it, and how to turn it into something everything can read.6 min read