What is JPEG compression and how do you shrink a JPG file?

JPEG compression lowers the file size by removing details of the photo data that your eye has trouble distinguishing. That is why JPEG is a "lossy" format: with every compression, part of the data is discarded and cannot be brought back. When the quality scale is chosen correctly, the result is indistinguishable from the original on screen.

In GörselKüçült, JPEG compression works on a single screen: upload your JPG files, choose the quality, enter a long-edge limit if you want, and download the output. No program installation is needed; the tool runs in your browser.

Why does a JPG file stay large?

Phones and cameras record the frame at high resolution; even a 12-megapixel photo can take up tens of megabytes uncompressed. The JPEG compression applied while saving shrinks the file, but it is often still large for the web.

Files that come out of editing programs can grow because they are re-encoded with every export. Screenshots and images saved from a browser are also often stored as JPG; since these are interface captures rather than photos, they react differently to compression.

Quality setting: which value should you choose for JPEG?

The quality scale in the tool runs from 40 to 95, and the default is 82. For photos published on the web, the 75-85 range gives a balanced result: a clear size drop with a loss you will not notice.

Below 60, blocking starts to appear in flat-color areas and blur at the edges. For text, graphics and screenshots, choosing PNG or WebP instead of JPEG gives a cleaner result; on this type of content, JPEG softens sharp edges.

Trying the same photo once at quality 82 and once at 60 and comparing the sizes on the result cards is the most practical way to find the right balance for your own content.

JPEG compression steps

The steps are the same for a single file and for bulk work:

• Drag and drop your JPG files or upload them with the file picker; the limit is 20 files per request and 100 MB per file.
• Choose the quality value; around 82 is balanced for most photos.
• If you also want to reduce the pixel dimensions, enter the long-edge limit (for example, 1600).
• Leave the output format as "Same format"; when you upload a JPG, the output is a JPG too.
• Start the compression, check the saving rate on the result card and download the file.

Bulk JPEG compression and ZIP

Processing dozens of JPGs such as product photos one by one takes time. In a bulk upload, each image is compressed separately; the cards list the original size, the new size and the saving rate. You can download all the outputs as a single ZIP file.

If re-compressing in the same format would make the file larger or would not bring a meaningful saving, the tool does not change the image and marks it as "already optimized". That way, files that are already small are not needlessly re-encoded during bulk processing.

Things to watch out for in JPEG compression

• Compression is irreversible; always keep the original file as well.
• Compressing the same file over and over accumulates quality loss.
• JPG does not support transparency; transparent areas are placed on a white background.
• Do not compress the high-resolution copy you set aside for printing or archiving.
• For the modern web, WebP is smaller than JPEG in most photos; you can compare the two outputs and decide.
• Before moving to bulk processing, test with a single file and confirm the setting; once you like the result, process the rest with the same setting.

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