JPG to PNG Converter

Sometimes you need your JPEG as a PNG — for editing without further quality loss, for a design tool that requires PNG, or to add transparency support. Drop your image here and download a lossless PNG instantly. The conversion runs entirely in your browser using the Canvas API; no file leaves your device.

Why Convert JPG to PNG?

Lossless editing. JPEG is a lossy format. Every time you save a JPEG, it goes through another round of lossy compression and loses a little more quality. If you need to make multiple edits — adjustments, overlays, text additions — convert to PNG first. PNG is lossless, so saving it 100 times produces an identical file each time.

Transparency support. JPEG has no alpha channel. PNG supports full 8-bit alpha transparency. Convert to PNG when you need to add transparent areas, cut out a background, or overlay the image on another element.

No further compression artifacts. If your source JPEG is high quality, converting to PNG stops any further lossy degradation. The PNG will preserve exactly what the JPEG contains — it won’t recover lost detail, but it won’t lose any more either.

Design tools and workflows. Many design tools (Figma, Sketch, some print workflows) prefer or require PNG for UI assets. Converting your JPEG to PNG makes it compatible with these pipelines.

Why PNG Files Are Larger Than JPG

This is one of the most common surprises when converting — the PNG output is often 3–5× larger than the JPEG input. Here’s why:

JPEG uses lossy compression based on the Discrete Cosine Transform (DCT). It discards fine detail that the human eye is unlikely to notice, particularly in areas of gradual color variation. A 2 MB photo can become a 200 KB JPEG with barely perceptible quality loss.

PNG uses lossless compression (DEFLATE algorithm). It stores every pixel exactly. The compression is effective for flat-color graphics and screenshots, but for photographs with millions of distinct colors, there is not much redundancy to exploit — and the file stays large.

When you convert a JPEG to PNG, you are taking already-compressed data and storing it losslessly. The PNG is larger than the JPEG but it does not contain more image information than the JPEG did. You cannot “recover” what JPEG already discarded.

When to Convert (and When Not To)

Convert to PNG when:

• You need to add transparency or remove the background
• You will edit the image multiple times and want to avoid re-compression artifacts
• You are creating a UI asset or icon that needs sharp edges at all scales
• The destination requires PNG format

Keep as JPEG when:

• The image is a photograph for the web and file size matters
• You just need to display it and not edit it further
• You are uploading to social media or a CMS that will re-compress anyway

How JPEG to PNG Conversion Works

function convertJpegToPng(file) {
  return new Promise((resolve) => {
    const img = new Image();
    img.onload = () => {
      const canvas = document.createElement('canvas');
      canvas.width = img.naturalWidth;
      canvas.height = img.naturalHeight;
      const ctx = canvas.getContext('2d');

      // Draw image onto canvas
      ctx.drawImage(img, 0, 0);

      // Export as lossless PNG
      canvas.toBlob(resolve, 'image/png');
    };
    img.src = URL.createObjectURL(file);
  });
}

Unlike PNG-to-JPEG conversion, there is no background fill step here — PNG supports transparency natively. The canvas starts transparent, and the JPEG pixels are drawn on top.

Python (Pillow)

from PIL import Image

img = Image.open('photo.jpg')
img.save('photo.png')  # automatic lossless PNG output

Sharp (Node.js)

const sharp = require('sharp');

sharp('photo.jpg')
  .png({ compressionLevel: 9 })  // 0–9, higher = smaller file (slower)
  .toFile('photo.png');

Frequently Asked Questions

Will the PNG be higher quality than the JPEG? No. Converting JPEG to PNG does not recover detail that was discarded during JPEG compression. The PNG is a lossless copy of what the JPEG contains. If the JPEG already has compression artifacts (blocky edges, color banding), those artifacts will be visible in the PNG too.

Why is the PNG file so much larger? PNG stores all pixel data losslessly. The larger file size is expected and correct — it does not mean something went wrong. For photographic content, JPEG’s lossy algorithm is simply much more efficient than PNG’s lossless approach.

Can I use the PNG to add transparency afterward? Yes. Once you have a PNG, you can open it in any image editor that supports alpha channels (Photoshop, GIMP, Affinity Photo, Figma) and add transparency. JPEG cannot store transparency at all.

Is my image uploaded to a server? No. All conversion uses the HTML5 Canvas API in your browser. The file never leaves your device.

Does converting affect the image dimensions? No. The output PNG has the same pixel dimensions as the input JPEG. No scaling or resampling occurs during format conversion.

What if I need a smaller PNG? PNG file size can be reduced by running the output through a PNG optimizer such as pngquant (lossy quantization) or oxipng (lossless re-compression). Online tools like Squoosh also offer PNG optimization. This tool focuses on format conversion only.