Crop JPG — free online tool
Crop a JPG to a square, 4:3 or 16:9 box and see the exact pixel size. The cut is re-encoded at quality 92, since browsers cannot crop JPG losslessly.
The preview will appear here after you select a file.
What to know
Cropping a JPG looks like pure deletion, but a JPG stores its picture in small blocks of 8 or 16 pixels, and a crop edge rarely lines up with them. Lossless crop tools exist for that special case; a browser canvas cannot do it. Here the kept region is copied to a fresh canvas and encoded again as JPG at quality 92, one extra lossy generation.
That cost is low for a single crop, which is why the tool does not ask you for a quality value. It becomes visible if you crop the same file repeatedly, so decide the final frame in one pass and start from the original each time.
Typical JPG crops are portraits and landscapes shot on a phone. Turning a 3000 x 4000 portrait into a square with the 1:1 lock gives a 3000 x 3000 box that you slide up or down to find the face. Turning a 4000 x 3000 landscape into a 16:9 band gives 4000 x 2250 and removes 750 rows of pixels in total, which you can split between the top and the bottom.
Metadata such as the camera model, exposure and GPS is not copied into the cropped file, because only the pixels are redrawn. If a photo needs to stay below an upload limit afterwards, pass the result through the JPG compressor and lower the quality there.
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How to use Crop JPG — free online tool
- Open the JPG; the crop box begins at the full frame.
- Click 1:1 for a square, 4:3 for a classic print shape or 16:9 for a widescreen band.
- Drag inside the box to slide it over the subject, then use the arrow keys for one-pixel corrections.
- Apply the crop, download the JPG and check the edges at full size for any leftover border.
Quick answers
Is cropping a JPG lossless?
No. The browser copies the selection onto a canvas and saves a new JPG at quality 92, which adds a small generation of compression. Dedicated lossless crop utilities that work on the JPEG blocks do exist.
How big is the square if I crop a 3000 x 4000 portrait to 1:1?
The largest square is 3000 x 3000, the full width. You choose which 3000 of the 4000 rows to keep by sliding the box.
Why is the cropped JPG sometimes a similar size to the original?
A tighter crop has fewer pixels but the same detail per pixel, and quality 92 is generous. Compress the cropped file afterwards if you need it to be much smaller.
Will the cropped photo still carry my location?
No. Only pixels are redrawn into the new file, so EXIF fields such as GPS are left behind.