Calculator
What the PNG to JPG does
PNG to JPG: converts your image to JPEG in the browser. Everything runs in your browser and the file is never uploaded.
Drop in a file and the PNG to JPG handles it locally. Processing is local, so speed depends on your machine rather than someone else’s server load.
It is mostly used by anyone shrinking a photo before uploading it. Oversized images are the most common reason a page feels slow.
Your data stays on your machine. Once the page has loaded you could disconnect entirely and it would still work.
Below the tool you will find the field reference, the method, and an example computed from the values it opens with.
What do the PNG to JPG fields mean?
The PNG to JPG uses 2 inputs. The starting figures are ordinary, not edge cases, so they make a sensible baseline.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
| Quality % | accepts 10 to 100 | 90 |
How does the PNG to JPG 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.
Bad input produces an error, never a confident-looking wrong answer.
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: the finished file to download, with a line in the panel saying what was done.
Because the work is local, speed depends on your device rather than our servers, and large files are limited only by available memory.
PNG to JPEG
This conversion trades two things for a much smaller file: transparency, which JPEG cannot represent at all, and exactness, because JPEG is lossy.
| Transparency | Lost | transparent pixels become a solid colour, usually white |
|---|---|---|
| Compression | Lossless → lossy | irreversible |
| Typical saving | 70 to 90% on photographs | much less on flat-colour images |
| Best for | Photographs saved as PNG | the classic oversized-file case |
Worth knowing
- If the PNG contains transparency, decide what colour should replace it before converting. The default is rarely what you want over a coloured background.
- Converting a screenshot of text or UI to JPEG produces visible ringing around edges. Keep those as PNG.
- The conversion cannot be undone. Converting back to PNG preserves the JPEG artefacts at a larger file size.
- Quality 85 is the usual sweet spot; below 70 artefacts become obvious on most images.
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.
- Enter Quality % (10 to 100).
- Press Convert.
- Look at Status in the output panel.
- If you need a record, Copy Link saves the inputs and Print produces a clean page.
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.
- Precision beyond what the inputs justify is not meaningful, however many digits appear.
- Nothing here can catch a correct number entered in the wrong field.
- Because everything runs locally, processing speed depends on your device rather than our servers.
Frequently asked questions
You need Image file and Quality %. A starting value is in place for each, so you can change one value at a time and watch how the result responds.
Quality % accepts 10 to 100. Anything beyond those bounds is flagged rather than approximated.
No upload takes place. The file is handled entirely in the browser and discarded when you close the tab.
No cost and no account. Use it as often as you like.
The computation is exact; how much you should trust the answer depends on how good your inputs are.