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Convert JPEG to PNG (JPEG to Portable Network Graphics)

Convert JPEG to PNG online. Drop a JPEG and get a Portable Network Graphics back at roughly 851% of the original byte cost. No sign-up, nothing saved.

Upload a JPEGSee sample JPEG to PNG conversions
  • Pixel-exact snapshot
  • No account required
  • Nothing saved
The same image as JPEG at 382 KB and lossless PNG at 3.2 MB, identical pixels.The same image as JPEG at 382 KB and lossless PNG at 3.2 MB, identical pixels.

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Oversikt

Convert JPEG to PNG. This tool takes a JPEG and re-encodes its pixels as a lossless Portable Network Graphics. What this does NOT do is recover detail that JPEG already discarded: the source was lossy, so the PNG you get back is a pixel-exact snapshot of the already-compressed image, not a higher-quality original.

PNG (Portable Network Graphics) is lossless: every pixel of the input is preserved exactly. It was standardised in 1996, supports an alpha channel, and is the universal editor-friendly format. Design tools (Photoshop, Figma, Affinity) import PNG without quality loss, which is why it is the right target when the next step is manual editing, layer compositing, or a transparent overlay.

JPEG (JPEG) is a lossy codec: its whole value is squeezing photographic content into a small file by discarding detail the eye is unlikely to notice. That compression is one-way. By the time a JPEG exists, the original high-frequency detail is gone forever and no subsequent format change can bring it back. This is the single most important fact about this direction.

The trade-off is size. PNG needs roughly 851% more bytes than JPEG for the same pixels, because it cannot compress by discarding perceptual detail. That is a feature of PNG, not a flaw. The upside is a file that survives round-trips through an editor with zero generation loss, unlike a JPEG that degrades slightly with every re-save.

When NOT to convert JPEG to PNG: when the destination is the public web (ship the JPEG directly or re-encode to a modern codec like AVIF or WebP). When you want "better quality" from the already-compressed source (you cannot get quality back). When the source already has a lossless master available: go back to the master, not through the JPEG.

Your JPEG upload is held only while we re-encode it. The resulting PNG comes back on a one-time download link and is deleted the moment you fetch it. Nothing is saved on our servers, and no account ties the upload to you. Converting JPEG to PNG on BouseMutton is a quiet one-shot snapshot, not a saved artefact.

Med et blikk

JPEG to PNG at a glance

Tallene og avveiningene du trenger før du forplikter deg.

  • No quality recovery

    JPEG was already lossy, so the PNG is a pixel-exact snapshot of the already-compressed image. The original uncompressed detail cannot be restored.

  • Editor-friendly

    PNG survives round-trips through image editors losslessly, so repeated save-and-reload cycles will not compound compression artifacts the way JPEG would.

  • Alpha channel available

    PNG supports transparent backgrounds and semi-transparent compositing. JPEG cannot represent transparency, so moving to PNG unlocks alpha workflows.

  • Expect a larger file

    PNG cannot compress by discarding perceptual detail, so it needs roughly 851% more bytes than JPEG at identical pixels.

  • Archival snapshot

    A PNG is a stable rollback point: further edits in an editor will not progressively degrade the file the way they do with JPEG.

  • Not a web-delivery choice

    For public-web delivery, re-encode from the original source to AVIF or WebP. The PNG is a working artefact, not a distribution format for a site of this era.

  • Year standardised

    PNG dates from 1996 and is supported in roughly 100%% of browsers; every image editor imports it without quality loss.

Arbeidsflyt

Hvordan det fungerer

Tre trinn, vanligvis ferdig innen fem sekunder.

  1. 1

    Upload a JPEG

    Drop a JPEG up to 25 MB, or paste from the clipboard. No sign-up, no credit card.

  2. 2

    We wrap it as lossless PNG

    We decode the JPEG and re-encode the resulting pixels as PNG with no further quality loss. The PNG you get back is a pixel-exact snapshot of the decoded source.

  3. 3

    Download your PNG

    Your PNG comes back on a one-time download link, ready to drop into an editor. Fetch it and the file is deleted; never come back and it is deleted anyway.

Eksempler

Se det i aksjon

Dra hver glider for å piksel-titte før og etter.

A 372 KB JPEG becomes a 3.6 MB lossless PNG, ready for an editor round-trip.A 372 KB JPEG becomes a 3.6 MB lossless PNG, ready for an editor round-trip.
A 372 KB JPEG becomes a 3.6 MB lossless PNG, ready for an editor round-trip.
A 154 KB source JPEG yields a 1.9 MB PNG: the PNG captures exactly the pixels the JPEG decoded to, with no further generation loss.A 154 KB source JPEG yields a 1.9 MB PNG: the PNG captures exactly the pixels the JPEG decoded to, with no further generation loss.
A 154 KB source JPEG yields a 1.9 MB PNG: the PNG captures exactly the pixels the JPEG decoded to, with no further generation loss.
A flat-colour region, preserved exactly at 612% relative size: PNG stores it losslessly, where JPEG would dither on re-encode.A flat-colour region, preserved exactly at 612% relative size: PNG stores it losslessly, where JPEG would dither on re-encode.
A flat-colour region, preserved exactly at 612% relative size: PNG stores it losslessly, where JPEG would dither on re-encode.
Personvern

Bildet ditt, borte når du er ferdig

Kjører i nettleseren din

Your JPEG upload is held only while we re-encode it. The resulting PNG comes back on a one-time download link and is deleted the moment you fetch it. Nothing is saved on our servers, and no account ties the upload to you. Converting JPEG to PNG on BouseMutton is a quiet one-shot snapshot, not a saved artefact.

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Glossary for JPEG and PNG

Klare definisjoner på vanlig norsk for fagspråket ovenfor.

FAQ

Vanlige spørsmål

Svar på det de fleste lurer på før de prøver et nytt verktøy.

Flere verktøy

Relaterte verktøy

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Relatert lesing

Related reading on JPEG, PNG, and editor workflows

Andre verktøy som passer godt sammen med dette.

  • Browse all format convertersSee the full set of JPEG and PNG tools on BouseMutton, including compression, EXIF stripping, and resize.
  • JPEG -> AV1 Image File FormatAlso converting JPEG to AV1 Image File Format? This tool handles the same source in a different target format, for cases where the codec choice differs.
  • WebP -> Portable Network GraphicsRun WebP through this tool before or after conversion to Portable Network Graphics, depending on the workflow step you are at.
  • Compress imageShrink an already-converted image further without changing its format, for bandwidth-constrained pages.

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