Images / Local tool

Image Compressor

Reduce a JPEG, PNG, or WebP file to a practical size, compare the output, and download it without sending the image away.

Your image stays in this browser

01 / Source

Choose an image

Source image JPEG / PNG / WebP

Or drag and drop a file onto this field.

Choose or drop one static image up to 25 MB and 40 megapixels. Compression requires JavaScript and stays on this device.

Your original appears here

Select one image to see its size and dimensions.

Compression settings

Target size KB Maximum dimension PX Output format

Starting quality 82%

The compressor may lower quality or dimensions further to approach the target. Converting a transparent image to JPEG fills transparent pixels with white.

02 / Result

Compare and download

OUT Your compressed image appears here

Choose settings and press Compress image.

How it works

Compress an image in three steps

This image compressor works with one static file at a time and reports the real output size instead of promising a fixed reduction.

01
Choose a local image.
Open one JPEG, PNG, or WebP image up to 25 MB and 40 megapixels.
02
Set the size and format.
Choose a target in KB, a maximum pixel dimension, the output format, and a starting quality.
03
Compare and download.
Review the actual file size and dimensions before saving the compressed copy.

01 / Target size

Reduce image size in KB

The target guides repeated compression. If quality changes are not enough, the image may need fewer pixels. The result always shows whether the selected target was reached.

02 / Formats

Compress JPEG and PNG, or create WebP

Keep the source format or choose JPEG, PNG, or WebP output. JPEG cannot store transparency, so transparent pixels are filled with white during conversion.

03 / Privacy

Use an image size reducer without uploads

Decoding and compression run locally in your browser. Nanomite does not upload the source or result, and the compressed copy does not preserve EXIF metadata.

Good to know

Quality, dimensions, and file size work together

A very small target can require visible quality loss or lower dimensions. PNG is lossless by design, so photographs often become smaller as JPEG or WebP, while diagrams and transparent graphics may still suit PNG.

Animated PNG and WebP files, SVG, AVIF, batch processing, enlargement, and metadata preservation are not included. Large images can also be limited by available browser memory.