B

Bawitools

Convert JPG/JPEG

Convert your JPG/JPEG images to any image format online for free - 100% local. 100% local conversion · your files are never uploaded to the server

CONVERTIR JPG/JPEG A...

Select output format

PNG.png
JPG.jpg
JPEG.jpeg
BMP.bmp
WebP.webp
TIFF.tiff
TIF.tif
ICO.ico
JFIF.jfif
PJPEG.pjpeg
PJP.pjp
📋 PNG - Sin pérdida de calidad, soporta transparencia, ideal para logos y gráficos
PNG (Portable Network Graphics) is a lossless format that supports transparency. Perfect for logos, icons, and graphics with sharp edges.

Drag your JPG/JPEG files here

Only {format} files · multiple files · 100% local conversion
100% local conversion · your files are never uploaded to the server

JPG/JPEG FILES (0)

Upload your JPG/JPEG files

Drag or click to select
JPG format guide

Converting from JPG: what survives, what does not, and where to go next

How JPEG lossy compression works and what to expect when you convert it to PNG, WebP, TIFF or other formats

JPEG is a 1992 standard (ISO/IEC 10918-1) and still the most widespread photographic format in the world: it is what virtually every camera, every phone and every screenshot shared over messaging produces. Its great strength is also its great limitation — JPEG compresses with loss, permanently discarding image information in order to reach small file sizes.
That matters before you convert anything, because it defines what you can expect from the result. When you convert a JPG to another format, you are not starting from the original image: you are starting from whatever survived the JPEG encoder. No destination format can bring back what was thrown away.

How does JPEG actually compress?

The encoder splits the image into 8×8 pixel blocks and applies a discrete cosine transform (DCT) to each one, turning pixels into frequency coefficients. Low frequencies describe smooth areas; high frequencies describe fine detail and edges. A quantization table then divides those coefficients and rounds them — and that rounding is where information is lost irreversibly. The more aggressive the quantization, the smaller the file and the greater the damage.
On top of that comes chroma subsampling. Human vision resolves changes in brightness far better than changes in colour, so most encoders store luminance at full resolution but colour at half resolution on each axis (4:2:0 mode). That is why saturated reds against a light background often look smeared in a JPG, and why red or blue text on white degrades so badly.

Typical JPEG artefacts, and why converting does not remove them

  • Blocking: the 8×8 grid becomes visible in skies, gradients and flat colour areas. It shows up when quantization wipes out nearly all high frequencies in a block.
  • Ringing or "mosquito noise": halos and speckles around sharp edges — text, logos, subtitles. It is the Gibbs effect of rebuilding a hard edge from too few frequencies.
  • Colour bleeding: colour spills past its outline because of 4:2:0 subsampling. Very visible on lettering and flat illustration.
  • Gradient banding: smooth transitions turn into steps because neighbouring coefficients rounded to the same value.
  • Generation loss: every time a JPG is opened, edited and saved as JPG again, it is quantized again. The damage accumulates even at high quality settings.
All of those artefacts are already part of the file's pixels. On conversion, the destination format treats them as legitimate image content: a PNG will store your JPEG blocking with perfect fidelity, not remove it.

Which format should you convert your JPG to?

DestinationWhat you gainWhat to watch out forBest when
PNGNo further loss from here on; supports an alpha channelThe file will grow substantially (often several times the JPG); it neither creates transparency nor repairs artefactsYou will edit the image over several steps and do not want loss to pile up
WebPSmaller than JPEG at comparable visual quality; very broad browser supportRe-encoding a lossy source adds degradation — use a high quality settingThe image is going on a website and you want it to weigh less
TIFFA lossless archival format accepted by print workflowsVery large files; impractical for the webYou need to deliver to a printer or archive the image
BMPRaw pixels with no compression layer at allEnormous size; today it mostly makes sense for legacy softwareA specific program will only accept BMP
ICOPackages the image as a Windows icon or faviconDesigned for small sizes; start from a square imageYou want a favicon for your site

JPG and JPEG are the same thing

There is no technical difference between a .jpg file and a .jpeg one. The three-letter extension is a leftover from MS-DOS, which only allowed 8.3-style filenames. The same goes for .jfif, .jpe, .pjpeg and .pjp: all are the same JPEG stream under a different label. This tool accepts any of them interchangeably.
There is a real difference between baseline and progressive JPEG. Baseline paints from top to bottom; progressive appears blurry first and sharpens as it loads. Both hold the same image and both convert identically — progressive tends to be slightly smaller.

EXIF metadata: what your JPG carries that you cannot see

A JPG from a phone or camera holds more than pixels. Its EXIF header carries the make and model of the device, the exact date and time, the shooting parameters and, very often, the GPS coordinates of where the photo was taken. It is information almost nobody looks at, and that gets shared unintentionally whenever the image is uploaded somewhere.
One more EXIF field causes trouble on conversion: the orientation tag. Many cameras store the photo exactly as it came off the sensor and note separately "rotate this 90°". Formats that ignore that field display the image on its side. If your conversion comes out rotated, that is why — the image itself is not broken.

Converting your JPGs step by step

Pick the output format

Choose above which format you want your images in. A short note underneath describes that format so you can confirm it is the right target.

Add your JPG or JPEG files

Drag them onto the drop zone or click to select them. You can process several at once; .jpg, .jpeg, .jfif, .pjpeg and .pjp are all accepted.

Adjust quality if the target supports it

When converting to a lossy format (WebP or JPG again), set quality higher than you normally would: your source has already been compressed once, and squeezing it twice is what causes visible damage.

Convert and download

Processing runs on your own machine. When it finishes, download the files individually or all together.

No. PNG is lossless, which means it stores <em>exactly</em> the pixels you hand it — including the blocking and halos left behind by JPEG compression. What you gain is that nothing further is lost from that point on, not the recovery of what was already lost.

That is expected. JPEG reaches those sizes precisely by throwing information away; PNG compresses without discarding anything. On top of that, PNG is tuned for flat colour areas, while a photograph has noise and texture in almost every pixel — the worst case for its algorithm. A PNG several times bigger than the source JPG is normal.

In lossy mode, yes: a second quantization is applied to an already quantized image. In practice, at a high quality setting the result is usually visually indistinguishable and considerably lighter. If you want no additional loss at all, use those formats' lossless mode or convert to PNG.

Not automatically. JPEG has no alpha channel, so there is no transparency information in your file to recover: what looks like a "white background" is genuinely white pixels. The PNG will support transparency, but cutting the background out is a separate editing step.

It depends on the destination format — not all of them have anywhere to put it, so in many conversions the camera, date and GPS data simply does not carry over to the new file. If you need it kept, check the result before deleting your original.

None. They are the same format with a different extension, due to a historical MS-DOS limit of 8.3-character filenames. You can rename one to the other without touching the contents.

Not by converting it. The information quantization discarded is no longer in the file. There are filters that smooth blocking and AI models that reconstruct plausible detail, but that is content invented by the algorithm, not your original detail.

Free

No sign-up

100% local conversion

Your JPGs are never uploaded to a server

Comments

Log in to leave a comment