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About this tool
Compress images instantly and reduce file size efficiently.
The Image Compressor reduces image file size directly in your browser — adjust the quality slider, optionally resize, and compare the original against the compressed result with a before/after slider before you download. Compress one image or a whole batch at once and download every result as a ZIP.
Open Image Compressor on AltFTool — it loads instantly in your browser.
Add one or more images by uploading or dragging them in.
Adjust the quality slider (and resize, if needed) and compare the before/after preview.
Download the compressed image, or download all results together as a ZIP.
Drag the quality slider and see the size and visual result update, so you control the size/quality trade-off directly.
A slider overlay lets you compare the original and compressed image directly before downloading.
Compress multiple images at once and download every result together as a ZIP.
Images are compressed on your device — nothing is uploaded to a server.
No — compression runs entirely in your browser using the Canvas API. Your images never leave your device.
Yes — add several images, compress them all together, and download every result in a single ZIP file.
Some quality loss is expected with JPEG-style compression, but the adjustable quality slider and before/after comparison let you find the smallest file size that still looks right for your use case.
Yes, completely free with no signup and no limit on how many images you compress.
Yes — turn on the resize option to shrink the image's dimensions at the same time as compressing it.