Calculator
What the JPG to PNG does
JPG to PNG: converts your image to PNG in the browser. Everything runs in your browser and the file is never uploaded.
Drop in a file and the JPG to PNG handles it locally. The work happens inside your browser tab, so there is no upload to wait for and no queue.
Oversized images are the most common reason a page feels slow. The JPG to PNG exists to take that particular chore off your hands.
Nothing leaves the tab. You can watch your browser network panel while you use it and see for yourself.
Each field is explained further down, along with the method and a worked example that uses the default values.
What do the JPG to PNG fields mean?
The JPG to PNG uses 2 inputs. The fields arrive populated, which makes it easy to nudge a single figure and watch what moves.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
| Quality % | accepts 10 to 100 | 90 |
How does the JPG to PNG work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same conversion.
Each field is verified before use; failures are reported explicitly rather than swallowed.
What a typical run looks like
You provide: Image file and Quality %
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: a new file plus a brief account of what happened to it, shown in the panel.
How long this takes is a property of your computer, not of our infrastructure, and file size is bounded by browser memory.
JPEG to PNG
This conversion makes the file larger and does not improve quality. It is worth doing for a specific reason (you need transparency, or lossless editing from here on), and not otherwise.
| Quality | Not recovered | JPEG artefacts are baked in |
|---|---|---|
| File size | Typically 3 to 10× larger | PNG is poor at photographs |
| Transparency | Now available | the usual reason to convert |
| Best for | Editing without further loss | or adding an alpha channel |
Worth knowing
- PNG is lossless, so it preserves the JPEG artefacts perfectly. It cannot remove damage that is already in the pixels.
- The genuine use case is stopping further generation loss: once in PNG, repeated edits and saves cost nothing.
- For a photograph you intend to publish, converting to PNG is usually the wrong move. The file grows several-fold with no visible benefit.
- If you need transparency and small files, WebP does both.
Read next: JPEG, PNG, WebP or AVIF: Choosing an Image Format
How to use it
- Choose your file under Image file, or drag it onto the drop area.
- Put Quality % (10 to 100).
- Press Convert.
- Check Status on the right.
- To keep the result, either copy the link or print the page. Both preserve what is on screen.
What this tool does not do
- Re-encoding a lossy format such as JPEG always loses some detail, even at maximum quality.
- EXIF metadata may be dropped during processing, which is usually desirable but worth knowing.
- Where a standard has revisions, the version used is the one named in the method section.
- The result inherits any error in the inputs without flagging it.
- Large files are limited by your available memory, not by an upload quota.
Frequently asked questions
Only Image file and Quality %. Defaults are loaded for all of them, so you can change one value at a time and watch how the result responds.
Quality % accepts 10 to 100. Go outside it and you get an error against that specific field instead of a misleading number.
No upload takes place. The file is handled entirely in the browser and discarded when you close the tab.
It is free with no conditions: no sign-up, and no limit on how often you use it.
It is accurate to the method shown. Rounding only affects what is displayed, never what is computed.