JPG to PNG Converter

What is a JPG to PNG converter?

A JPG to PNG converter takes a JPG image and re-saves it in the PNG format, keeping the full resolution and every pixel exactly as it is. This tool draws your JPG onto an HTML canvas and exports it as a lossless PNG, then downloads the result. Everything happens locally in your browser, so the file is never uploaded to a server.

It is the quick way to move a photo or screenshot into a lossless format that will not lose any more detail when you edit and re-save it, or to get a PNG when a website, app, or design tool specifically asks for one — without installing software or trusting a stranger’s server with your picture.

What does this tool do?

You choose a JPG and click Convert. The tool re-draws the picture onto a canvas at its natural pixel size and exports that canvas as a PNG, which it downloads to your device automatically. There are no quality sliders to set, because PNG is lossless: it stores the pixels exactly, so there is nothing to trade off.

The new PNG has the same resolution as the JPG you put in — the same width and height in pixels. What changes is the file format and, almost always, the file size: because PNG never throws detail away, a photographic JPG usually becomes a larger PNG, not a smaller one.

How does it work?

The method is canvas re-encoding, not a math formula. Here is the exact sequence:

1. The tool reads your chosen JPG and loads it at its natural pixel size.
2. It creates a canvas the same width and height as the image, then draws the JPG onto it.
3. It exports the canvas as a PNG using lossless compression, so every pixel on the canvas is preserved exactly.
4. It downloads that PNG to your device at the same resolution as the original.

A few terms, defined. Lossless means the format stores the image without discarding any detail, so the PNG is a pixel-perfect copy of what was on the canvas. Lossy is the opposite — JPG works by throwing away fine detail to shrink the file. Resolution is the pixel width and height, which conversion leaves untouched. Transparency (also called the alpha channel) is PNG’s ability to mark pixels as see-through; JPG has none, so a converted JPG is fully opaque. Because PNG keeps everything while JPG had already compressed the photo, the PNG often ends up the bigger file even though the two images look identical.

Examples

Each example matches exactly what the widget does — draw the image on a canvas and export a lossless PNG at the same resolution. Real numbers vary with the image, so these show the typical pattern.

Example 1 — a JPG photo to a same-resolution PNG. You pick a 1920 x 1080 photo saved as a 400 KB JPG and click Convert. The download is a PNG at the identical 1920 x 1080 resolution that looks pixel-for-pixel the same on screen. Because PNG is lossless, the PNG is often a larger file — perhaps a couple of megabytes — even though no detail was added.

Example 2 — a logo with transparency stays transparent. You convert a logo that already has transparent areas. The tool draws it on the canvas and exports PNG, and because PNG supports transparency, those see-through regions are kept exactly — the logo stays a clean cut-out rather than landing on a solid background.

Example 3 — a screenshot to PNG. You convert a JPG screenshot of text and UI. The PNG comes out at the same resolution and looks identical, and from here on re-saving will not add more JPG artifacts, since PNG does not re-compress. Note that any blocky “mosquito noise” the JPG already had around text is faithfully preserved — PNG cannot remove damage that was baked in earlier.

JPG vs PNG 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	JPG (input)	PNG (output)
Compression	Lossy	Lossless
Transparency	Not supported	Supported
Best for	Photos and detailed images	Logos, icons, text, screenshots, editing
Typical photo file size	Smaller	Larger
Detail	Already discarded by JPG	Preserved exactly, none restored
Resolution after convert	Unchanged	Unchanged

For everyday photos, JPG stays smaller; convert to PNG when you need lossless quality, sharp edges, or transparency support rather than a smaller file.

Common uses

Converting JPG to PNG comes up wherever a lossless or PNG-specific format is needed:

• Lossless editing — get a PNG to edit and re-save repeatedly without each save adding more JPG compression artifacts.
• Meeting format requirements — supply a PNG to a site, app, design template, or print workflow that only accepts PNG, not JPG.
• Crisp graphics — keep screenshots, charts, diagrams, and text-heavy images sharp, since PNG handles flat color and hard edges cleanly.
• Layering and design — drop an image into a design tool as PNG so it sits well alongside transparent assets.
• Archiving — store an image in a lossless format so future copies stay pixel-identical.

Tips and common mistakes

A few details get you the best result:

• Do not expect a smaller file. PNG is lossless, so converting a photo from JPG almost always makes it bigger. If your goal is a smaller file, keep it as JPG or compress instead.
• Converting will not restore lost quality. JPG already discarded detail; PNG just preserves what remains. A blurry or blocky JPG becomes an equally blurry, blocky PNG.
• JPG has no transparency to gain. A photo converted to PNG is fully opaque. PNG keeps transparency only when the source already had it.
• Resolution stays the same. Conversion never changes width and height. To make the image larger or smaller in pixels, resize it separately.
• Use PNG for the right jobs. Pick it for editing, sharp graphics, and transparency — use JPG when small photo file size matters most.

Limitations and notes

This tool always outputs a PNG at the source’s native resolution, with no quality or size options, because PNG is lossless and has nothing to trade off. It changes the format but never the pixel dimensions, and it cannot recover detail that JPG compression already removed. Since PNG stores everything, the output is frequently larger than the JPG you started with — that is expected, not a bug. It accepts the image your browser can read and rejects non-image files, and very large images are limited only by your browser’s memory.

Most importantly, the whole process runs privately in your browser. Your JPG 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 shrink the result, resize the dimensions, or convert back the other way, pair this with the image compressor, the image resizer, and the PNG to JPG converter, and browse the full Image & PDF tools collection.