Image Compressor
Reduce image file size with adjustable quality or a target KB limit.
About this tool
ToolAlto's image compressor reduces image file size directly in your browser. For JPEG output, you can choose a quality level or enter a maximum file size such as 100 KB or 200 KB. The target-size option searches for a suitable JPEG quality while keeping the original pixel dimensions.
How to use it
- Choose a JPG, PNG, WebP or GIF image.
- Choose quality-based compression or enter a target file size.
- Select JPEG for smaller photo files, or PNG when transparency needs to be preserved.
- Compress the image and compare the original and result sizes.
- Download the compressed image.
Important quality note
JPEG compression is lossy, so smaller files can involve some quality loss. ToolAlto does not promise zero quality loss. If you need transparency, use PNG output; however, lossless PNG compression may not make the file smaller.
Privacy
The compression work is performed in your browser using the image data you select. The tool does not need to upload the image to a ToolAlto server to create the result.
Frequently Asked Questions
Does image compression reduce quality?
JPEG compression is lossy, so reducing file size can reduce image quality. PNG output preserves image data but may not produce a smaller file.
Can I compress JPG and PNG images?
Yes. You can select JPG, PNG, WebP or GIF files. JPEG output is generally useful for reducing photo file sizes, while PNG is useful when transparency must be preserved.
Are my images uploaded?
No. The compression is performed directly in your browser, so the selected image does not need to be uploaded to a ToolAlto server.