🖼️
JPG to PNG Converter
Convert any JPG or JPEG image to a lossless PNG — free, instant, and fully private.
Select a JPG Image
🔒
Converted entirely in your browser — your image is never sent to any server.
Drag & drop your JPG here
or click to browse · JPG/JPEG only · max 20 MB
⚠
⚠
Original · JPG
📁
📐
🗜️ Lossy compression
Converted · PNG
📁
📐
✨ Lossless
JPG (original)
→
PNG (converted)
PNG is lossless — larger file size is normal.
Same quality, lossless encoding.
↺ Convert another image
How It Works
📤
1. Upload JPG
Select any JPG or JPEG photo — from camera, web, or scans.
🔄
2. Instant Convert
The browser renders the image onto a canvas and re-encodes it as PNG instantly.
💾
3. Download PNG
Save the lossless PNG directly to your device with one click.
Category
🖼️ Image ToolsJPG vs PNG
JPG / JPEG
- • Lossy compression (some quality lost)
- • Smaller file sizes — good for photos
- • No transparency support
- • Best for photos / web images
PNG
- • Lossless — zero quality loss
- • Larger file sizes
- • Supports transparency (alpha)
- • Best for graphics, screenshots, logos
Things to Know
- •The PNG will preserve every pixel from your JPG exactly — no further quality loss.
- •PNG files are often 2–5× larger than the original JPEG — this is normal.
- •JPEG compression artifacts (if any) are preserved — this tool doesn't reconstruct lost data.
- •The converted PNG background will be white (JPG has no transparency).
- 🔒Your image is processed locally — nothing is uploaded.
Related Tools
The conversion pipeline, step by step
The tool runs a short, entirely local pipeline. The file you choose is read by the browser as a data URL, loaded into an image object, and its natural width and height are read off. A canvas is created at exactly those dimensions, so no scaling or resampling occurs.
Before drawing, the canvas is filled with white. This matters because a canvas starts out transparent while a JPEG has no alpha channel at all, so filling first guarantees that the converted PNG has a solid background rather than transparency where the JPEG had none. The image is then drawn onto the canvas, and the canvas is asked for a PNG data URL, which triggers the browser's own PNG encoder.
The two formats compress in fundamentally different ways. JPEG is lossy: it transforms blocks of pixels into frequency coefficients and discards the ones the eye is least sensitive to, which is how it reaches small file sizes. PNG is lossless, using filtering followed by DEFLATE compression, so it reproduces every pixel exactly as the canvas holds it. That difference is the reason for almost every surprise in the output size.
Before drawing, the canvas is filled with white. This matters because a canvas starts out transparent while a JPEG has no alpha channel at all, so filling first guarantees that the converted PNG has a solid background rather than transparency where the JPEG had none. The image is then drawn onto the canvas, and the canvas is asked for a PNG data URL, which triggers the browser's own PNG encoder.
The two formats compress in fundamentally different ways. JPEG is lossy: it transforms blocks of pixels into frequency coefficients and discards the ones the eye is least sensitive to, which is how it reaches small file sizes. PNG is lossless, using filtering followed by DEFLATE compression, so it reproduces every pixel exactly as the canvas holds it. That difference is the reason for almost every surprise in the output size.
Worked example: a photograph and a screenshot compared
Take a photograph from a phone camera, 4032 by 3024 pixels, saved as a 2.4 MB JPG. The panel reads those dimensions and the original size as soon as the file is selected. After conversion the PNG comes out several times larger, commonly in the region of 12 to 20 MB depending on how much fine detail the image holds. That is not a fault: the JPEG had already thrown away detail to reach 2.4 MB, and PNG now stores every remaining pixel losslessly, including the compression artefacts.
Now take a screenshot of a user interface, 1920 by 1080 pixels, saved as a 480 KB JPG. Flat blocks of colour and sharp text compress extremely well losslessly, so the PNG may land close to or even below the JPG size, while looking cleaner because the ringing around text is no longer being re-compressed.
The pattern is consistent. Photographic content with continuous tone and noise grows substantially in PNG. Graphics with limited colours, flat regions and hard edges stay similar or shrink. The size comparison shown after conversion lets you check which case you are in before downloading.
Now take a screenshot of a user interface, 1920 by 1080 pixels, saved as a 480 KB JPG. Flat blocks of colour and sharp text compress extremely well losslessly, so the PNG may land close to or even below the JPG size, while looking cleaner because the ringing around text is no longer being re-compressed.
The pattern is consistent. Photographic content with continuous tone and noise grows substantially in PNG. Graphics with limited colours, flat regions and hard edges stay similar or shrink. The size comparison shown after conversion lets you check which case you are in before downloading.
What converting does and does not give you
Converting to PNG does not improve the image. Everything JPEG discarded when the file was first saved is gone, so blocky artefacts around edges, colour banding in skies and softened detail all survive the conversion intact and are then stored losslessly. What you gain is a copy that will not degrade further, which is genuinely useful as a working master if you intend to crop, annotate or re-save several times, since each JPEG re-save compounds the loss.
It also does not give you transparency. PNG supports an alpha channel, but the source JPEG has none, and the canvas is deliberately filled with white first, so the output is fully opaque with a white background wherever the original had one. Making part of an image transparent is a separate editing job.
Two more things worth knowing. Because the image is redrawn onto a canvas, embedded metadata such as EXIF camera settings, GPS coordinates and copyright fields is not carried into the PNG, which is a privacy benefit when sharing but a loss if you rely on that data. And very large images can exhaust the browser's memory, in which case closing other tabs or using a smaller file is the fix.
It also does not give you transparency. PNG supports an alpha channel, but the source JPEG has none, and the canvas is deliberately filled with white first, so the output is fully opaque with a white background wherever the original had one. Making part of an image transparent is a separate editing job.
Two more things worth knowing. Because the image is redrawn onto a canvas, embedded metadata such as EXIF camera settings, GPS coordinates and copyright fields is not carried into the PNG, which is a privacy benefit when sharing but a loss if you rely on that data. And very large images can exhaust the browser's memory, in which case closing other tabs or using a smaller file is the fix.
Frequently Asked Questions
No. The file is read and re-encoded in your browser using a canvas, so it never leaves your device. That means the conversion works on private images without exposing them, and it also means nothing is stored for you, so download the PNG before closing or reloading the page.
JPEG is lossy and discards detail to shrink the file, while PNG is lossless and stores every pixel exactly. Photographic content therefore grows, often several times over. Screenshots, logos and flat graphics with few colours compress far better losslessly and may end up a similar size or smaller.
No. Detail removed when the JPEG was first saved cannot be recovered, and any existing artefacts are preserved exactly in the PNG. The benefit is that the PNG will not lose anything further, which makes it a good working format if you plan to edit and re-save the image repeatedly.
No. JPEG has no alpha channel, so there is no transparency to preserve, and the canvas is filled with white before the image is drawn to keep the result consistent. The PNG is fully opaque. Adding transparency requires an editor that can select and delete a background region.
The pixel dimensions are preserved exactly, since the canvas is created at the image's natural width and height with no resizing. Metadata is not: EXIF fields such as camera settings, timestamps and GPS coordinates are dropped when the image is redrawn, which helps privacy but removes information you may want to keep.