How to Convert PNG to JPG (Free, In Your Browser, No Sign-up)

Format conversion is one of those problems that shouldn't exist but always does. You have a PNG. The form says "JPG only". Or you have a JPG with a white background and the new platform wants transparency, so you need PNG. Or someone sent you a WebP and your editor doesn't know what to do with it.

Here's the simplest way to convert without installing anything or watermarking your image.

The flow

1. Open AI Pass Canvas.
2. Drag your image onto the canvas.
3. Click Export in the top right.
4. Pick the target format (PNG / JPG / WebP).
5. Click Download.

The conversion happens in the browser — your image never leaves your machine, which is a quiet win for anything sensitive (screenshots of internal tools, ID photos, financial docs).

Which format to use

Quick rules for picking:

Use PNG when:

• Your image has transparency (logos, icons with transparent background)
• It's a screenshot of a UI (PNG keeps text crisp; JPG smudges it)
• It's text or simple graphics (sharp edges)
• File size doesn't matter much

Use JPG when:

• It's a photograph (JPG handles smooth color gradients well)
• File size matters (JPG is usually 5-10× smaller than PNG)
• The destination only accepts JPG
• You don't need transparency

Use WebP when:

• The destination supports it (most modern browsers, some uploaders)
• You want the smallest possible file at decent quality
• It's a hero image on a website (WebP saves real bandwidth)

The Export dialog has all three. Switch and download — no need to convert in some other tool.

The transparency catch with JPG

JPG doesn't support transparency. If your PNG has a transparent background, converting to JPG will turn that transparency into white (or whatever background was set). This is the right behavior most of the time — JPGs are for photographs, photographs don't have transparency — but if you wanted to keep the alpha channel, you need PNG or WebP.

Quality vs file size

For lossy formats (JPG and WebP), the Export dialog has a Quality slider. Higher = bigger file, sharper image. Lower = smaller file, more compression artifacts. Some defaults to know:

• 92 (default) — balanced. Good for most uploads.
• 80 — noticeably smaller, slight artifact on smooth gradients (skin, sky).
• 60 — significantly smaller, visible artifacts on careful inspection.
• 30 — heavy artifacts, only for thumbnails where size is critical.

For a screenshot of a UI, prefer PNG (which is lossless and doesn't have a quality knob). For a photo where the upload limit is 1 MB, JPG at 80-85 is usually right.

Resize while you're at it

Most of the time you're converting because the upload destination has constraints. Often it has a size constraint too — "max 1 MB" or "exactly 512×512". The Export dialog has Width × Height inputs that stay aspect-locked. Type a smaller width and the height auto-fills.

So you can convert AND resize in one step. PNG to JPG at 50% size, all in one download. The output filename includes the dimensions when you've changed them, so you can keep multiple versions straight.

Why not just rename the file?

A common mistake — renaming image.png to image.jpg doesn't actually convert anything. The bytes inside are still PNG-encoded, the file extension just lies. Some uploaders will reject it as malformed. Real conversion re-encodes the image data into the new format, which is what an editor does.

When you need batch conversion

AI Pass Canvas works on one image at a time. If you have 200 PNGs to convert to JPG, a batch tool is faster — magick (ImageMagick) on the command line:

mogrify -format jpg *.png

That's a one-liner if you have ImageMagick installed. For a couple of images at a time, a browser tool is usually faster than firing up Terminal.