Convert any image to JPEG
To convert an image to JPEG, drop it here and choose JPEG as the output. Encoding uses MozJPEG, which produces files roughly 10% smaller than a standard JPEG encoder at the same quality. Transparency is flattened onto white, because JPEG has no alpha channel. Nothing is uploaded.
JPEG is the format to convert to when something has to open absolutely everywhere — an old photo frame, a printing service, a government upload form, a colleague's decade-old software. It is not the most efficient choice any more, but it is the most universally understood image format there is, and MozJPEG makes it meaningfully better than the encoder most tools ship with.
What you gain, by source format
- From PNG
- Far smaller for photographs, at the cost of transparency, which gets flattened onto a white background.
- From WebP
- Compatibility with anything that predates 2020, at the cost of roughly a third more bytes.
- From AVIF
- Universal support instead of Safari 16 and newer — the conversion to make when something refuses to open your file.
- From GIF
- Better colour, since JPEG is not limited to a 256-colour palette. Transparency is lost.
- From BMP
- Order-of-magnitude savings, with no practical downside for photographic content.
What to know
- JPEG has no alpha channel. Anything transparent is composited onto white, and the interface says so per file rather than surprising you.
- Encoding uses MozJPEG with trellis quantisation, which typically produces 10% smaller files than a standard encoder at identical quality.
- EXIF, ICC profiles and XMP are preserved, including the orientation handling — rotation is baked into the pixels and the tag reset to 1.
- For line art, screenshots and text, JPEG is the wrong choice — it will produce visible ringing around hard edges. Use PNG or lossless WebP instead.
Frequently asked questions
- What happens to transparency when converting to JPEG?
- It is flattened onto a white background, because the JPEG format has no way to store an alpha channel. Every file where this happens is flagged in the results list. If transparency matters, convert to WebP, PNG or AVIF instead — all three support it.
- Why convert to JPEG rather than WebP?
- Compatibility. JPEG opens in essentially every piece of software ever written, including old printers, photo frames, upload forms and legacy applications that reject anything modern. If the file has to be accepted by something you do not control, JPEG remains the safest answer.
- Does this keep EXIF when converting to JPEG?
- Yes. EXIF, ICC colour profiles and XMP are copied across as raw bytes rather than parsed and rewritten, so maker notes and unusual vendor tags survive intact. Camera model, copyright, timestamps and GPS all come through.
- What quality should I use for JPEG?
- Between 75 and 85 for photographs, which is where the file gets substantially smaller without visible artefacts. The default here is 82. Below about 70 you will start to see blocking in flat areas and ringing around text.