A maximum, not padded bytes
A successful output stays at or below the selected budget. An original that already meets matching requirements can be returned unchanged.
Compress Image to KB Online
Set a maximum size and find a high-quality image below that limit. DocsReady adjusts quality first, then dimensions when necessary.
- 1 Choose Your file
- 2 Adjust Your requirement
- 3 Download Ready to use
Your file is ready
Processed directly in your browser. Your files stay on your device.
How to compress an image to a specific KB size
1. Upload an image
Choose a JPG, PNG or WEBP image from your device.
2. Enter your maximum size
Use Maximum file size to enter the limit and select KB or MB. Quick picks fill common limits.
3. Adjust optional settings
Choose an accepted output format and set Minimum dimensions if your destination requires them. Leave Resize before compression off initially; use Advanced size settings only to choose different starting dimensions.
4. Start compression
Select Compress to your chosen limit. The tool searches quality first, reducing dimensions when necessary.
5. Check and download
Review the size, format and dimensions. Use Download Image to save the result.
Supported formats and features
Formats and dimensions
JPG, PNG and WEBP input is supported. Minimum dimensions protect required pixel sizes. Advanced size settings control starting dimensions, which may be reduced further within your chosen minimum limits.
KB and MB units
1 KB is 1,024 bytes and 1 MB is 1,048,576 bytes. If a form uses decimal bytes, choose a slightly lower target.
A limit, not a padded file
Choose the maximum size accepted by your destination. Quality is adjusted first, then dimensions only if necessary. Use JPG for photo uploads that require it; a smaller result is valid and is never padded to hit an exact byte count.
Choose a common image-size limit
Choose a starting budget below, or set a custom maximum in Compress Image to KB.
Good questions. Simple answers.
Is the downloaded file exactly the selected number of bytes?
No. Your entry is an upper limit. DocsReady never adds padding to hit an exact byte count; a smaller result is valid.
Why did my pixel dimensions change?
If lowering quality cannot reach the budget, this tool reduces dimensions while preserving proportions. Compare the final dimensions with your upload requirements.
Can a detailed photograph fit every small limit?
Very small budgets can require visible quality loss or smaller dimensions. The tool reports an error if it cannot produce a valid output within its safety limits.
Is DocsReady free?
All DocsReady tools are free to use. No account or subscription is required.
Does my file get uploaded to a server?
No. These tools process file contents in your browser. Temporary previews and results use browser memory; Start Over releases their references. Downloads remain on your device.
Can I use DocsReady on mobile?
Yes, in a modern browser with image and download support. Use fewer or smaller files if a large job exceeds your device’s memory. Your browser controls where downloads are saved.
Need exact pixel dimensions too? Use Resize Image.