Image Compressor

Reduce image file size while preserving quality — supports batch compression

The Image Compressor reduces JPEG, PNG, and WebP file sizes by adjusting quality, output format, and maximum dimensions — entirely in the browser, with batch mode for compressing multiple images at once and ZIP download.

Upload Images

Drag & drop images here

or browse to upload

Supports JPEG, PNG, WebP — select multiple files for batch mode

Original Image

Compression Settings

Quality 80%

Max Width (px)

Max Height (px)

Output Format

Compression Result

–

Original Size

–

Compressed

–

Saved

Original

Compressed

Batch Compression Result

Frequently Asked Questions

How do I compress an image without losing quality?

Set the Quality slider to 80–85% for JPEG or WebP output. At this range most images lose imperceptible detail while achieving 40–70% file size reduction. Leave Max Width and Max Height empty to preserve original dimensions. Download and compare the before/after side-by-side shown in the tool to verify the result meets your standards.

Is it safe to compress images on this tool — does it upload my files anywhere?

No files are uploaded. The compressor uses the browser’s Canvas API: your image is decoded into an in-memory canvas, re-encoded at the chosen quality, and offered as a download — all locally. No server receives your image data, making it safe for confidential product photos or client assets.

How do I compress multiple images at once?

Select more than one image file in the upload dialog (or drag a batch of files to the drop zone). The tool automatically enters batch mode, showing each file in a list. Adjust Quality and optional dimensions once, click Compress All, and download each file individually or click Download All (ZIP) to get them bundled.

Can I resize images while compressing them?

Yes. Enter values in the Max Width and/or Max Height fields. The tool maintains the original aspect ratio — if your image is 3000×2000 and you set Max Width to 1200, the output will be 1200×800. This is useful for shrinking oversized photos destined for web use without distortion.

What is a limitation of browser-based image compression?

PNG compression quality is fixed — the Canvas API encodes PNGs losslessly using zlib, so the Quality slider has no effect on PNG output size. To shrink PNGs significantly, switch the Output Format to JPEG or WebP (both support the quality setting), or reduce the image dimensions. Transparency is lost when converting to JPEG.