JPG to PNG Converter — Lossless Output, Stop Re-Save Degradation

How to convert JPG to PNG

1. Drop your JPG files onto the converter above — or click to browse. Multiple files are supported.
2. Click Convert on any file, or Convert all to process your entire batch at once.
3. Download individually or click Download all for a ZIP archive.
4. Tip: PNG captures the JPG at its current state — existing artifacts are preserved, not recovered. Use PNG to prevent future degradation.

Local conversion — no upload, no quality risk

All conversion runs in your browser. JPG files — even high-res DSLR shots at 20+ MB — are processed locally via the Canvas API. No file is sent to any server; no cloud storage is touched.

Speed is limited only by your CPU. Converting a batch of 30 high-resolution photos typically takes under 5 seconds — no upload wait, no processing queue, no server bottleneck.

// JPG has no transparency — no white fill needed
const canvas = document.createElement('canvas')
canvas.width = img.width
canvas.height = img.height
canvas.getContext('2d').drawImage(img, 0, 0)
// PNG is lossless — pixel values are preserved exactly
canvas.toBlob(cb, 'image/png')

Who converts JPG to PNG

Photographers exporting from Lightroom or Capture One who then need further edits — overlays, watermarks, or retouching. Converting to PNG first stops the quality spiral of re-saving as JPG multiple times.

Graphic designers compositing product photos in Photoshop or Affinity Photo. Working in PNG ensures every layer merge and adjustment lands in a lossless container — no generation loss between steps.

Web developers preparing UI screenshots for documentation or marketing sites. PNG preserves sharp text and interface elements that look blocky and blurry when re-saved as JPG repeatedly.

JPG vs PNG — format comparison

When to convert to PNG vs keep JPG

Convert JPG to PNG when:

• Multi-step editing — every re-save as JPG degrades quality; PNG stops the cycle
• Photoshop / GIMP / Affinity workflows — work in PNG, export as JPG only for final delivery
• Adding transparency — convert to PNG first, then remove background in your editor
• Logos and icons — PNG preserves sharp edges and solid colors that JPG blurs
• Presentations and documents — PNG text and UI elements stay crisp at any zoom level

Keep JPG when:

• Final web delivery — JPG is 3–8× smaller; use it for the published version
• Email and social media — platforms recompress images anyway; JPG is the right source
• Photography archives — original camera JPGs lose nothing extra by staying JPG
• Storage is limited — PNG files for photos can be enormous; JPG is practical for bulk storage

How the conversion works

Your browser draws the JPG onto an HTML5 Canvas, then encodes the pixel data as PNG via toBlob(). Since JPG has no transparency, no white fill is needed — pixel colors are captured exactly as they appear in the source.

Important: PNG captures the JPG at its current state. Compression artifacts already in the JPG — blurry edges, blocky areas, color noise — are preserved in the output. PNG stops future degradation but cannot undo past compression.

const blob = await new Promise(resolve => {
  const img = new Image()
  img.onload = () => {
    const canvas = Object.assign(
      document.createElement('canvas'),
      { width: img.width, height: img.height }
    )
    // No quality param for PNG — lossless by spec
    canvas.getContext('2d').drawImage(img, 0, 0)
    canvas.toBlob(resolve, 'image/png')
  }
  img.src = URL.createObjectURL(jpgFile)
})