PNG to JPG Converter

What is a PNG to JPG converter?

A PNG to JPG converter takes a PNG image and re-saves it in the JPG format, usually producing a much smaller file at a quality you choose. This tool draws your PNG onto an HTML canvas, exports it as a JPG, and shows the original size, the new JPG size, and the image dimensions — then downloads the JPG. Everything happens locally in your browser, so the file is never uploaded to a server.

It is the quick way to turn a heavy PNG photo or screenshot into a light JPG that emails faster, fits an upload limit, or loads quicker on a web page — without installing anything or trusting a website with your picture.

What does this tool do?

You choose a PNG and set a quality value between 10% and 100% with the slider (92% is a sensible default for photos). When you click Convert & download, the tool re-draws the picture as a JPG at that quality, immediately downloads the result, and fills in the details: the Original size, the JPG size, and the Dimensions (width by height in pixels).

The two sizes are shown in kilobytes (KB) so you can see exactly how much you saved. Lower quality means a smaller file but softer detail; higher quality keeps detail but saves less. The pixel width and height never change — only the format and the file size do.

How does it work?

The method is canvas re-encoding, not a math formula. JPG is a lossy, opaque format, so the tool has to flatten and re-compress the image. Here is the exact sequence:

1. The tool reads your chosen PNG and loads it at its natural pixel size.
2. It creates a canvas the same width and height as the image, fills it with white, then draws your PNG on top. The white fill is essential because JPG has no transparency: any see-through pixels in the PNG land on solid white.
3. It exports the canvas as a JPG at the quality you selected, where the slider value is divided by 100 to give a quality factor from 0.10 to 1.00.
4. It downloads that JPG and reports the original size, the JPG size, and the dimensions.

A few terms, defined. Quality is how much detail JPG keeps when it compresses; it is not a percentage of the file size. KB (kilobyte) here means 1024 bytes — the tool divides the byte count by 1024 to display each size. Dimensions are the pixel width and height, which conversion leaves untouched. The big size drop comes from JPG itself: where PNG stores pixels losslessly, JPG throws away fine detail the eye barely notices, so photographic PNGs often shrink dramatically.

Examples

Each example matches exactly what the widget does — flatten onto white, export as JPG at the chosen quality, and report the sizes and dimensions. Real numbers vary with the image, so these show the typical pattern.

Example 1 — a 1.5 MB photo PNG at 92% quality. You pick a 1.5 MB photographic PNG and leave the slider at 92%. The output typically becomes a few hundred KB — a large saving — while looking essentially identical on screen. Original might read 1536.0 KB, JPG 280.0 KB, and Dimensions 1920 x 1080.

Example 2 — a transparent PNG logo. You pick a PNG logo that has a transparent background. Because JPG cannot store transparency, the tool draws the logo onto a white canvas first, so the transparent areas appear white in the JPG. The file converts fine, but you now have a logo sitting on a solid white rectangle rather than a transparent cut-out.

Example 3 — the same photo at 50% quality. Drop the slider to 50% and the JPG shrinks further than at 92%, but you start to see softer detail and faint blocky patches in skies and smooth gradients. It saves more space at the cost of sharpness — fine for a thumbnail, poor for a print. The Dimensions stay the same, for example 1920 x 1080.

Example 4 — a flat screenshot or diagram. You convert a PNG screenshot of text or a simple diagram at 92%. JPG handles sharp edges and flat color worse than PNG, so you may notice faint halos or “mosquito noise” around text, and the JPG might not even be much smaller than the original PNG. For crisp text and line art, PNG is usually the better keep.

PNG vs JPG reference

This table summarizes why the conversion behaves the way it does. The size column shows the typical direction for the listed content, not a promise.

Aspect	PNG (input)	JPG (output)
Compression	Lossless	Lossy, quality 10-100%
Transparency	Supported	Not supported — becomes white
Best for	Logos, icons, text, screenshots	Photos and detailed images
Typical photo file size	Large	Much smaller
Dimensions after convert	Unchanged	Unchanged

For most photographic PNGs, 92% quality is the sweet spot: a large size cut with no obvious quality loss.

Common uses

Converting PNG to JPG comes up wherever a PNG is too big or the wrong format:

• Shrinking heavy screenshots — a full-resolution PNG screenshot of a photo-rich page can be many megabytes; a JPG makes it light enough to email or attach.
• Meeting upload limits — get a photo under an attachment or form size cap, such as a job portal or government site that rejects files over a few hundred KB.
• Faster web pages — serve photographic images as JPG so pages load quicker and pass speed checks, since JPG is far smaller than PNG for photos.
• Sharing photos — send pictures over chat or email without long uploads on a slow connection.
• Compatibility — supply a JPG to an older system, printer workflow, or app that expects JPG rather than PNG.

Tips and common mistakes

A few details get you the best result:

• Use JPG for photos, not graphics. JPG excels at photographic detail. Logos, icons, text, and line art keep sharper edges and smaller files as PNG.
• Expect transparency to vanish. Any transparent PNG areas become white here, because JPG has no transparency. If you need to keep the see-through background, do not convert to JPG.
• Start at 92%, then adjust. It usually gives a big saving with no visible loss. Only drop lower if you still need a smaller file and can accept softer detail.
• Conversion is one-way and lossy. JPG discards detail permanently, so keep your original PNG and convert a copy. Re-saving a JPG again just degrades it further.
• Converting will not shrink dimensions. The width and height stay the same. If the image is far larger than where it will be shown, resizing first saves even more.

Limitations and notes

This tool always outputs a JPG, which is why transparency is flattened to white and the result is opaque. It changes the format and file size but never the pixel dimensions. Sizes are shown in KB by dividing bytes by 1024, so they are close estimates rather than byte-exact figures. Because JPG is lossy, flat graphics and text can pick up faint artifacts, and an already-small or non-photographic PNG may not shrink much — or could even come out slightly larger. It accepts the image and rejects non-image files with a clear message, and very large images are limited only by your browser’s memory.

Most importantly, the whole process runs privately in your browser. Your PNG is drawn on a canvas and exported in JavaScript — it is never uploaded, logged, or stored, which makes it safe for personal or confidential images and usable offline once the page has loaded.

To resize before converting, shrink further, or embed the result in code, pair this with the image resizer, the image compressor, and the image to base64 converter, and browse the full Image & PDF tools collection.