Compress image for Slack in seconds. QuickList's compressor adjusts quality with a live preview so you can keep Slack uploads under 1 GB per file.
Drop a JPG, PNG, WebP, GIF, AVIF, or supported image file into the tool.
QuickList applies the conversion, compression, resize, crop, or analysis step locally whenever possible.
Compare quality, size, dimensions, colors, or format before downloading.
Download the result or upload it to QuickList to create a shareable URL.
Slack accepts most images, but staying under 1 GB per file avoids re-compression artefacts and speeds up sharing. Use the slider until your file is comfortably below that.
Apps like Slack apply their own aggressive compression. Pre-compressing with QuickList lets you control quality before upload — the result usually looks much sharper.