Free · No sign-up · Runs in your browser

Convert PNG to JPG.

Turn PNGs into smaller JPGs that are accepted everywhere — batch convert as many as you like, without a single file leaving your device.

Not uploaded — nobody sees it Convert several at once No watermark, ever No subscription or account

Drop your PNG images here, or click to browse PNG files · add as many as you like

Photo quality

Your files are never uploaded — they’re processed right here in this browser tab, on your device. There’s no server involved, so we never see them, copy them or keep them.

How it works

Three steps, no waiting on a server

Altto's PNG to JPG tool works right in your browser tab using the canvas built into every modern browser, so there's no upload queue and no “processing your file” spinner tied to someone else's servers.

Add your PNG images

Drop in one or more .png files.

Convert

Altto decodes and re-encodes each image locally.

Save your JPGs

One image downloads directly; several come back as a .zip.

Why this runs in your browser, not on a server

Photos and screenshots often contain things you’d rather not hand to a stranger’s server just to change the file format. Altto skips that step completely — there’s no server for it to go to.

Nothing is uploaded, everEvery image is decoded and re-encoded using your browser’s own canvas, because there’s no server on the other end. That also means we can’t see it, copy it or keep it.
No account, no email wallConvert as many images as you like without signing up or handing over an email address.
Batch conversion built inAdd a whole folder of PNG images at once and get them all back together.

images stored on our servers. There’s no server involved at all — each JPG is built once, then everything happens locally.

FAQ

Frequently asked questions

The practical details on what this tool can and can’t do. Need to go the other way? Try JPG to PNG. Not sure which format you actually need? See JPG vs PNG: which should you use?

Why convert PNG to JPG?

JPG files are usually much smaller than PNG for photos, and JPG is accepted everywhere — handy when a form or upload limit only takes JPG, or you just want a smaller file.

Is my image uploaded anywhere?

No — nothing is ever uploaded. Every image is decoded and re-encoded entirely inside this browser tab using the canvas built into your browser. There's no server involved at all, so there's nothing for Altto to see, copy or keep.

What happens to transparency?

JPG doesn’t support transparency, so any transparent areas in the PNG are filled with white.

Will I lose quality?

Choose Standard for everyday sharing (smaller files) or High for close-to-original quality (larger files) — either way, even Standard uses a high JPG quality setting.

Can I convert several images at once?

Yes — add as many PNG files as you like. One image downloads directly; more than one comes back as a .zip.

Do you keep a copy of my images?

No. There's no upload, so there's nothing on our side to keep. See the Privacy Policy for details.

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