How to use the compress image to 10KB
- 1Press Choose images (or drag files in, or paste with Ctrl+V). Several images can be added at once.
- 2Each image is compressed straight away. Optional: set Max width or Max height if the image must also fit a pixel size.
- 3Check the result row: new size in KB and exact bytes, dimensions and quality. Press Preview for a before/after comparison.
- 4Press Download on a row, or Download all (ZIP) for every file.
Why 10KB usually means small dimensions
10 KB is 10,000 bytes, a few hundredths of a percent of a typical phone photo. A JPG photo needs roughly 1–2 bits per pixel at medium quality to stay recognizable, so 10 KB holds somewhere around 40,000–80,000 pixels: about 230–330 px on the longer side of a 4:3 photo. That is why the tool reduces the dimensions for this target. A full-size photo at the lowest quality would still be far over 10 KB, and would look worse than a smaller, cleaner one.
Images with plain backgrounds and few details, such as signatures, logos and line drawings, keep more pixels at 10 KB than photos do.
Signatures: crop tight, then compress
Most 10 KB uploads are signatures. Sign with a dark pen on white paper, photograph it square-on in daylight, and crop so the signature fills the frame with only a small margin: every extra strip of paper costs bytes. Use the crop tool first, then compress here.
If the form gives exact pixel dimensions as well as 10 KB, use the photo resizer in KB instead, so both the size and the dimensions are right.
Grayscale for scanned signatures
Open More options and tick Black and white (grayscale). A signature has no useful color, and paper tint and camera color noise waste bytes. In grayscale the same 10 KB buys more pixels and cleaner strokes.
If the signature is faint, photograph it again with more light or a darker pen. Compression can't restore ink the camera didn't capture, and lowering the quality only makes faint strokes blotchier.
If the form accepts 10-20KB
When the form allows 10 to 20 KB, aim for the top of the range for a sharper result: use compress image to 20KB, or the photo resizer in KB with a minimum and a maximum. If the form only states a maximum of 10 KB, this page is all you need.
Results are counted with 1 KB = 1,000 bytes, so a result under 10 KB here is also under a 10,240-byte limit.
Are my files uploaded?
This tool runs entirely in your browser. Your files are not uploaded to our servers.