Compress Image to Exact KB.
Reduce an image to a measured byte ceiling without uploading its pixels or metadata. Compress JPEG, PNG or WebP locally under an exact maximum byte ceiling with bounded quality and dimension attempts, explicit alpha/orientation changes and independent output decoding.
- ✓Runs in your browser
- ✓No account required
- ✓Verified output
Use Compress Image to Exact KB
Private in this browser. Image bytes, pixels, filenames, metadata, encoder candidates, previews and output stay in this browser.
No file selected.
Verified result
Download resultHow it works
- 01
Choose one JPEG, PNG or WebP image up to 50 MB and set the maximum KB target.
- 02
Choose Auto, JPEG or WebP and review the explicit background used if alpha must be flattened.
- 03
Download only after the output signature, actual bytes, dimensions, orientation and alpha independently verify.
Frequently asked questions
Will a transparent image remain transparent?
Auto selects WebP for detected alpha. Choosing JPEG explicitly flattens alpha over the selected background and reports that change.
What happens when the requested size is impossible?
The tool verifies and reports its bounded smallest candidate and reason, but does not offer that over-target result for download.
Does Compress Image to Exact KB upload my data?
Compress Image to Exact KB runs locally in your browser. Image bytes, pixels, filenames, metadata, encoder candidates, previews and output stay in this browser.