Compress an image to 5 KB
The smallest limit most forms ask for, reached by cutting pixels as well as quality.
- Private by defaultDeleted within an hour
- Super FastProcess in seconds
- No Sign-upStart instantly
How it works
Add your images
Drag and drop, paste, or pick files. They upload over an encrypted connection.
Pick a quality or a target size
Use the quality slider, or tell it exactly how many KB or MB you need.
Download
Save each file, or grab them all at once as a ZIP.
5 KB is about the size of this paragraph saved as a plain text file. For a picture that is extremely small, so the tool works in two steps. It lowers the quality first, and when that is not enough it reduces the pixel dimensions until the file fits.
At this size you are compressing a small image, not a photograph. Signatures, initials, stamps, simple logos and tightly cropped thumbnails reach 5 KB well. A busy photo of a crowd will not, and the tool says so by showing the smallest size it could reach.
Start from the smallest, plainest version of the picture you have. Crop away every edge that does not matter, because empty margins still cost bytes. Each attempt is quick and nothing is stored beyond one hour, so a few tries cost you nothing.
What 5 KB can hold
A rough budget for a clean JPEG is one bit per pixel. Five kilobytes is 40,000 bits, so the picture can have about 40,000 pixels. That is a square of 200 by 200, or a wide strip of 300 by 130 pixels.
Flat colour is cheap and texture is expensive. A black signature on white paper may need only 2 KB at 300 by 120 pixels, while a face of the same size can need three times as much.
Signatures and stamps
Most requests for a 5 KB file are for a signature or a thumbprint on an online application. Sign with a dark pen on white paper, photograph it in daylight, then crop close to the ink before compressing. Switching to black and white in the editor removes colour data you do not need.
When 5 KB is out of reach
If the original is a large colour photo, quality alone will never get there. Reduce the width and height in Resize to what the form needs, then run the compressor again. If the result still looks too rough, ask whether the form really means 5 KB, since many sites mean 50 KB and drop a zero.
Scanning a signature the right way
The best 5 KB signature starts as a good scan, not a small file. Use thick black ink, press firmly, and leave a clear margin of white paper around the strokes. Photograph it straight on, with no shadow of your phone across the page. A clean source means the compressor spends its few thousand bytes on the pen line and not on paper grain.
After compressing, zoom in on the result at full size. If the loops have filled in, try a slightly larger target such as 8 KB, or crop closer so the strokes fill more of the frame.
When the form also sets dimensions
Many forms fix a width and height as well as the weight, for instance 140 by 60 pixels for a signature. Set those dimensions first and compress afterwards. The 5 KB is then spent only on the pixels the form will actually show.
Frequently asked questions
Is 5 KB too small for a passport photo?
Usually yes. A face needs more detail than 40,000 pixels can show cleanly, so try 20 KB or 50 KB for portraits and keep 5 KB for signatures.
Which format gives the smallest file here?
JPEG for photos and WebP for flat graphics. The format menu lets you try both and compare the numbers shown next to each result.
Why did the dimensions change?
Quality alone could not reach 5 KB, so the tool also scaled the picture down. The final width and height are listed beside the file size.
Is the result exactly 5,000 bytes?
It is at or under 5,000 bytes, with 1 KB counted as 1000 bytes. A file that reads a little lower is normal.
Can a photo of a person ever reach 5 KB?
Only as a very small thumbnail, around 150 pixels square. It will be recognisable at that size on a screen but not suitable for identification.
Why is my file under 5 KB and not exactly at it?
The tool picks the best setting that stays at or below the target, and the steps between settings are not infinitely fine. A result of 4.6 KB is normal.