PNG to JPG Converter (and JPG to PNG)
Convert PNG to JPG with a chosen background colour for transparent areas, or JPG to PNG, in batches of up to 20 — all on your device, nothing uploaded.
In short
PNG to JPG conversion flattens transparency onto a background colour (white by default) and applies lossy compression — quality 85–95 is visually identical and several times smaller; JPG to PNG is lossless but larger and cannot restore detail already lost. Forms that accept only JPG are the usual reason to convert.
Who this is for: Anyone whose form, portal or app wants JPG instead of PNG (or the reverse), in batches.
PNG vs JPG — which to use
- JPG is for photos: lossy compression gives small files, but no transparency — transparent PNG areas are filled with the background colour you choose (white by default; use your page colour for web graphics).
- PNG is lossless and keeps transparency: logos, screenshots, text, line art. Converting a JPG to PNG does not restore lost detail; it just stops further loss and usually makes the file several times larger.
- Forms and portals that "only accept JPG" (job sites, visa applications, exam boards) are the main reason to convert PNG screenshots and scans. If they also impose a KB limit, use the resize-to-KB tool afterwards.
Assumptions
- Canvas re-encode; JPG output flattened on the chosen colour; PNG output lossless.
- Up to 20 files per batch; metadata removed.
- Processed on the device.
Worked example
Converted to JPG at quality 90 on a white background → about 220 KB, same 1920 × 1080 pixels; text stays crisp at 90 but can show faint halos at 70 and below.
Frequently asked questions
Why does my JPG have a black background?
Some converters fill transparency with black; this one uses the colour you set (white by default).
Does converting lose quality?
PNG → JPG is lossy, but at quality 85–95 the difference is invisible for most uses. JPG → PNG is lossless.
Can I convert many files at once?
Yes, up to 20 per batch, with a Download all button.
Is anything uploaded?
No — everything runs in your browser via the canvas API.
How do I convert PNG to JPG without a black background?
Set the background colour (white by default) — transparent areas are filled with it before saving as JPG.
Is JPG smaller than PNG?
For photos, usually 5–10× smaller; for flat graphics with few colours PNG can be smaller and sharper.
Related calculators
Found an error? Report it — tell us the inputs, the result you got, what you expected and the rule or source. Confirmed corrections are published within a week.
Ready to build your next digital solution?
Send the brief and you get a scoped response with approach, milestones and a fixed price range. Not a sales call.
A 30-minute call with the engineer who would run your project
Within 2 business daysA written scope: approach, module breakdown, milestones, fixed price range
Within 5 business daysYou decide. No retainer, no obligation, and the scope document is yours to keep either way
Your timelineSend your brief
Three fields to start. Add project details if you have them.