PNG to JFIF Converter
To convert PNG to JFIF, add the .png above, choose a quality level, and download the .jfif. Because JFIF uses lossy JPEG compression, this conversion re-encodes the image and flattens any transparency onto a solid background.
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- Nothing uploaded
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Why convert PNG to JFIF?
Going from PNG to JFIF means moving from lossless to lossy, which is a one-way door. Keep the PNG. Convert a copy.
The other thing to watch is transparency. PNG can store a full alpha channel; JFIF cannot store any. Transparent pixels have to be composited onto something, and this converter uses white by default because that is what matches most documents and print backgrounds.
How to convert PNG to JFIF
- Add your PNG file. Drag it onto the box above, press Choose files, or paste with Ctrl+V. Several files at once is fine.
- It converts straight away. There is nothing to set up — conversion starts on its own and runs on your own processor, so there is no upload wait and no queue.
- Press Download. One button per file, or a single ZIP for the whole batch. Quality and resizing live under “More options” if you want them.
Nothing on this page sends a network request while you convert. Open your browser's DevTools, switch to the Network tab, and watch it stay empty.
What happens to your image
The PNG is decoded, composited onto a solid background to remove the alpha channel, and re-encoded as baseline JPEG inside a JFIF container at your chosen quality. Screenshots and images containing sharp text suffer most from this — expect faint ringing around letterforms at quality settings below 90.
| Property | PNG | JFIF |
|---|---|---|
| Full name | Portable Network Graphics | JPEG File Interchange Format |
| Extension | .png | .jfif, .jfi, .jif |
| MIME type | image/png | image/jpeg |
| Compression | Lossless (DEFLATE with filtering) | Lossy (DCT-based, JPEG baseline) |
| Transparency | Yes | No |
| Animation | No | No |
| Standard | ISO/IEC 15948 | W3C PNG (Third Edition) | ITU-T T.871 | ISO/IEC 10918-5 |
| Introduced | 1996 | 1992 |
| File signature | 89 50 4E 47 0D 0A 1A 0A | FF D8 FF E0 … 4A 46 49 46 00 |
| Best used for | Screenshots, logos, line art, transparency, images you will re-edit. | Nothing in particular — it is the same image as a .jpg, just labelled differently. |
JFIF is defined by ITU-T T.871 | ISO/IEC 10918-5 — read the specification.
Why this converter does not upload your files
Nearly every converter you will find works the same way: your file is uploaded to a server, converted there, and offered back as a download link. That means a copy of your image sits on somebody else's disk, for a retention period you have to take on trust, reachable by a URL you did not choose.
This one does not work that way. Browsers have been able to decode and re-encode images natively for years — the same capability every web application uses to show you a preview before an upload. This site simply stops at that point and hands you the result. There is no upload endpoint on this domain to send a file to, which is a stronger guarantee than any privacy policy: the capability does not exist.
The practical effects: nothing to delete afterwards, no size cap (your device's memory is the only limit), no queue at busy times, no daily allowance, and it keeps working if your connection drops mid-session. Sensitive material — ID scans, medical documents, contracts, anything under GDPR or HIPAA — never crosses a network boundary at all.
PNG to JFIF — frequently asked questions
What happens to transparent areas?
They are filled with a solid colour — white by default — because the JPEG format has no alpha channel.
What quality should I choose?
Use 90 or higher for screenshots, logos and anything containing text. 75–85 is fine for photographs.
Can I convert back to PNG afterwards?
You can, but the detail lost in the JPEG step does not come back. Always keep the original PNG.