JPG to PNG
Process images in your browser — your files never leave your device.
What is the JPG to PNG?
This tool converts JPG files to PNG by decoding each JPEG onto a canvas and re-encoding it losslessly — no quality slider, because PNG has none to offer. Drop in one or more .jpg files and download pixel-identical PNGs at the same dimensions. The counterintuitive part: the output is almost always bigger than the input, often 2–4× bigger, because PNG has to losslessly store every JPEG compression artefact that already exists in the source, and that noisy detail compresses far worse than a clean photo would. This conversion exists for compatibility and lossless-editing reasons, not for saving space.
Convert JPG to PNG when a tool or workflow requires PNG input regardless of size — some design software, certain upload forms, or a pipeline that needs to add transparency to the image afterward. If your only goal is a smaller file, converting in this direction is the wrong move; PNG to JPG goes the other way for that.
Why use a free jpg to png?
Genuinely lossless output
Once converted, the PNG can be edited, cropped or layered without introducing any new compression artefacts — useful as a base file for further lossless work.
Adds a real alpha channel
The output PNG supports transparency going forward, even though the source JPEG never could — useful as a first step before removing a background or compositing.
No quality setting to worry about
Because PNG is lossless, there is nothing to tune. The conversion either runs or it doesn't — there is no quality/size trade-off decision to make.
Universal PNG compatibility
PNG is accepted everywhere JPEG is, plus some places JPEG is not — certain design tools and print workflows require PNG or TIFF input specifically.
Batch conversion with ZIP download
Convert a whole folder of JPGs at once and get every PNG back in a single ZIP file.
How do you use the JPG to PNG?
- 1
Add your JPG files
Drag and drop one or more .jpg/.jpeg files, or click to browse.
- 2
Convert
There is no quality setting to configure — click Convert and each file is decoded and re-encoded as lossless PNG immediately.
- 3
Check the size change
Expect the PNG to be larger than the source JPG, sometimes significantly. This is normal and expected, not a sign of an error.
- 4
Download
Download files individually or as a ZIP for batches of more than one converted file.
How is jpg to png calculated?
Output size ≈ g(pixel count, image entropy) — always ≥ what a fresh lossless encode of the same pixels would needWhere:
- pixel count
- Width × height, unchanged by conversion
- image entropy
- How unpredictable the pixel values are — JPEG compression artefacts add fine, high-frequency noise that raises this and hurts PNG's compression ratio
- DEFLATE ratio
- PNG's lossless compressor works best on smooth, repetitive pixel data — the opposite of what heavily JPEG-compressed detail looks like
The simple version
PNG compresses by finding predictable patterns in pixel data and storing them more compactly. A clean, uncompressed photo has some of that predictability. A JPEG has already been through lossy compression, which leaves behind small blocky and ringing artefacts that look almost like noise to a lossless compressor — and noise is exactly what DEFLATE cannot compress well. That is why converting JPG to PNG usually grows the file instead of shrinking it.
What does it look like in practice?
Typical photo conversion
Input
1.2 MB JPEG photo, 3000×2000, quality unknown (as originally saved)
Result
~3.6 MB PNG
A 3× size increase is typical — the PNG has to losslessly encode every JPEG artefact already baked into the source pixels.
Simple graphic saved as JPEG by mistake
Input
180 KB JPEG of a flat-colour logo with sharp edges
Result
~95 KB PNG
One of the few cases where JPG to PNG produces a smaller file — flat colour and sharp edges compress well under PNG's lossless algorithm, and JPEG compression on this kind of content already introduces ringing artefacts that add file weight without adding real detail.
High-detail nature photo
Input
4.5 MB JPEG, 4032×3024, dense foliage and texture
Result
~14 MB PNG
Fine, high-frequency detail is the worst case for this conversion — both the real texture and the JPEG compression noise around it resist lossless compression.
How accurate is it?
The JPEG is decoded to a full bitmap using the browser's native decoder, then re-encoded with PNG's lossless DEFLATE compression via canvas.toBlob. The result is bit-for-bit identical to the decoded JPEG pixels — no further quality loss occurs during this conversion, only during the original JPEG encode that already happened before you uploaded it.
- The output file size cannot be predicted from the input JPEG's size alone — it depends on how much detail and JPEG artefacting are present in the decoded pixels, which is why results vary by 2–4× larger even for similarly sized source files.
- This conversion cannot undo JPEG compression artefacts — blocking or ringing already in the JPEG carries straight through to the PNG, just stored losslessly instead of further compressed.
- A newly added alpha channel is fully opaque everywhere; JPG to PNG does not create transparency, it only makes the format capable of holding it for future edits.
What should you know before using it?
What changes and what stays the same when converting JPG to PNG:
| Property | Result of conversion |
|---|---|
| File size | Typically 2–4× larger, sometimes more for high-detail photos. |
| Image quality | Unchanged — the JPEG pixels are copied exactly, artefacts and all. |
| Transparency | Added as a capability (fully opaque), not populated from anything in the source. |
| Pixel dimensions | Unchanged. |
| Editability | Improved — the PNG can now be edited losslessly without stacking further compression artefacts. |
Which tools relate to the jpg to png?
The jpg to png is one of 31 image tools on this site. These are the ones most often used alongside it — either because they handle the next step in the same job, or because they answer a question this tool raises.
PNG to JPG
The reverse and far more common conversion — shrinks the file by re-applying lossy compression, at the cost of any transparency.
Compress PNG
If the resulting PNG is inconveniently large, this is the tool to trim it — mainly by capping pixel dimensions, since PNG has no quality slider to lean on.
Image Crop
A common reason to convert to PNG first is to crop or composite losslessly afterward without introducing new JPEG generation loss.
HEIC to JPG Converter
If your source photo started as HEIC, convert it to JPG first, then to PNG here if a lossless intermediate file is what you actually need.
When should you use a jpg to png?
Because the jpg to png runs entirely in your browser, it suits work you would not want to hand to a third-party server — client files, unpublished drafts, anything under an NDA. These are the situations people reach for it in most often.
Preparing a base file for background removal
Some background-removal and compositing tools expect or work more predictably with PNG input, since the output needs an alpha channel that JPEG cannot hold.
Design software requiring PNG import
Certain design and print tools restrict imports to lossless formats. Converting a JPEG asset to PNG satisfies that requirement without altering the visible image.
Avoiding generation loss during multi-step edits
If a JPEG is going to be cropped, layered or edited repeatedly, converting to PNG first stops each edit from re-compressing and degrading the image further.
Icon and asset pipelines that assume PNG
Build tools and app icon generators frequently only accept PNG source files — converting a JPEG source satisfies that even if the visual content started life as a photo.
Open the Icon and asset pipelines that assume PNGFrequently asked questions
Why does converting JPG to PNG make the file bigger?
Does converting JPG to PNG improve image quality?
Can I add transparency to a JPG by converting it to PNG?
Why would I convert JPG to PNG if the file gets bigger?
Is the conversion from JPG to PNG lossless?
Can I convert several JPG files to PNG at once?
Is the jpg to png safe to use?
This tool runs entirely inside your browser. Your text, files and settings are processed on your own device and are never uploaded to our servers — there is nothing for us to store, log or leak. You can confirm it yourself: open your browser DevTools, switch to the Network tab, and use the tool. You will not see an upload request. It also means the tool keeps working if your connection drops mid-task.
Where do these figures come from?
Every method, threshold and standard this page relies on, with a link to the document that defines it. Check them — a tool that will not show its sources is asking you to take its word for it.
- 1Portable Network Graphics (PNG) Specification (Third Edition)
W3C · 2003
Supports: The lossless DEFLATE re-encoding described, and why it stores JPEG artefact noise inefficiently.
- 2Information technology — Digital compression and coding of continuous-tone still images: Requirements and guidelines
ITU-T Recommendation T.81 / ISO/IEC 10918-1 · 1992
Supports: The description of the lossy DCT compression already applied to the source JPEG before this conversion runs.
Read more about jpg to png
JPG vs PNG: Which Image Format Should You Pick for Web and Print?
JPG vs PNG explained simply. Compare compression, transparency, file size, and use cases with free tools and clear examples. Free, fast, and no signup required.
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How to Convert iPhone HEIC Photos to JPG
Learn how to convert iPhone HEIC photos to JPG online free. Universal compatibility in seconds. Step-by-step guide with batch tips inside! No signup required.
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