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JPEG to PNG Converter: Lossless Copy, Browser-Side

Convert JPEG to PNG locally, no uploads. Get a lossless working copy for tools that demand PNG. Honest about why it won't add quality and why it's bigger.

Browser Native
Privacy First
Free Tool

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How It Works

Two situations send people here. One: a tool flat-out rejects JPEG (Discord sticker uploads, certain app-icon pipelines, design-software import dialogs, some print services) and only takes PNG. Two: you're about to open, tweak, and re-save an image several times, and you don't want each save to re-run JPEG compression and stack new artifacts on the old ones. Re-wrapping the JPEG as PNG solves both, and that's exactly what this tool does. Mechanically, it's a decode-then-re-encode. Your browser turns the JPEG back into raw pixels, then writes those same pixels into a PNG container with PNG's lossless DEFLATE compression. Every pixel the decoder produced lands in the PNG unchanged. From this point on the image stops degrading on save, which is the whole reason a lossless container is worth the larger file. What it does not do is recover detail. JPEG already discarded high-frequency information and may have left blocking or color banding when the source was first compressed. Those flaws are baked into the pixels the decoder hands over, so they get copied straight into the PNG. The PNG freezes the current state, it doesn't reverse the original compression. Expect the file to grow, often several times the JPEG's size, because PNG keeps everything JPEG was throwing away to stay small. The conversion runs entirely on your device. The file is read into memory, decoded, and re-encoded in the browser tab, then the PNG downloads straight back to you. Nothing is uploaded and nothing is stored on a server, so it keeps working even if you drop offline after the page loads.

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Key Features

  • No file uploads required - works offline
  • 100% privacy focused - client-side processing
  • Browser powered - no software installation
  • Fast processing - WebAssembly technology
  • Free forever - no premium accounts

Supported File Formats

.jpg .jpeg

Output Format: PNG

Technical Specifications

input Format JPEG/JPG (Joint Photographic Experts Group), lossy source
output Format PNG (Portable Network Graphics), lossless container
compression Type Lossless DEFLATE on output; the source JPEG stays lossy and is not recoverable
quality Retention Preserves the decoded JPEG pixel-for-pixel; cannot restore detail JPEG already discarded
color Space Support sRGB, 8-bit per channel; no alpha added since JPEG has no transparency
max Resolution Limited only by your device's memory
processing Time Instant, runs in your browser

Key Benefits

  • Lossless from here on, so every later edit-and-save stays artifact-free
  • Satisfies tools, forms, and platforms that only accept PNG
  • Copies the decoded JPEG pixel-for-pixel with no new compression added
  • Runs fully in your browser, no uploads and no server
  • No false promise of recovering detail JPEG already discarded
  • Keeps working offline once the page has loaded
  • No file-count limits and no conversion quotas

Common Use Cases

  • Feeding a JPEG into a tool or upload form that only takes PNG
  • Making a lossless working copy before a multi-step edit
  • Preparing a JPEG for software whose import dialog rejects it
  • Building app-icon or sticker assets that require PNG
  • Standardizing a mixed batch of assets on one lossless format
  • Producing a PNG for a print or design pipeline that mandates it
  • Archiving the current state of an edited image without further loss

Pro Tips

  • Don't expect a quality bump: the PNG locks in the JPEG as-is, artifacts included
  • Plan for a much larger file, often several times the JPEG's size
  • Edit in PNG throughout, then export back to JPEG only at the end if you need it small
  • For photos staying on the web, keep JPEG or try WebP instead of bloating to PNG
  • Transparency isn't created here; use an editor if you need to cut out a background
  • Keep the original JPEG if disk space is tight; the PNG is for editing, not shrinking

Frequently Asked Questions

No. PNG is lossless, but it can only keep the pixels it's handed. Your JPEG had detail permanently removed when it was first compressed, and that loss copies directly into the PNG. The gain is that the image stops degrading from here on, not that it gets sharper. If the JPEG shows blocking or banding, the PNG will show the identical artifacts in the same spots.
Two real reasons. Compatibility: many tools, upload forms, and import dialogs only accept PNG, so re-wrapping is the quickest way past them. Editing: if you'll open and re-save the image multiple times, working in PNG means every save is lossless, so you stop piling fresh JPEG artifacts on top of the old ones each round trip.
Expected. JPEG hits small sizes by deleting data; PNG keeps every pixel with lossless compression, so a PNG of the same photo is commonly several times larger. The gap is widest for photographic content with lots of fine detail. If size matters more than lossless editing, keep the JPEG, or look at WebP for a smaller modern format.
No. JPEG has no alpha channel, so there's nothing transparent to carry over. Your PNG comes out fully opaque with the same background the JPEG had. PNG does support transparency, but converting won't cut out a background on its own. For that you need an editor or a background-removal tool.
No. Everything runs in your browser. The JPEG is decoded and re-encoded to PNG on your own device, and the result downloads straight from the page. No upload, no server processing, no storage. You can disconnect from the network once the page has loaded and the conversion still works.
Usually not. For photographs on the web, JPEG or WebP is the right call because it stays small and loads fast. PNG earns its place online for screenshots, logos, line art, and anything that needs transparency. Converting a JPEG photo to PNG just inflates the file with no visual gain, which slows your page.
No, and this is the most common misconception. The original lossless data was destroyed the moment the image was first saved as JPEG. Converting to PNG, TIFF, or any other lossless format afterward only preserves the already-degraded version. No tool can reconstruct what JPEG threw away.
Yes, within your device's available memory. Because decoding and encoding happen locally, big images use your machine's RAM instead of a server. Most photos convert instantly. Very large files may take a moment and depend on how much memory your browser and device can spare.