Compress image to 40 KB
Need an image under 40 KB? Drop it below and PhotoReducer finds the highest quality that fits the limit — automatically, and without uploading anything.
Drop images here or click to browse
JPG, PNG, WebP, AVIF, HEIC, GIF, BMP · processed on your device, never uploaded
How to use this tool
- Pick your target file size, for example 100 KB, and drop your photos into the tool.
- The tool tests quality levels automatically until the image fits under your limit.
- Check the preview and download the image, or process a whole batch and get a ZIP.
How the 40 KB limit is reached
PhotoReducer tries different quality levels and keeps the best one whose file stays under 40 KB. For strict limits like this one, large photos are also scaled down automatically until they fit.
Who asks for 40 KB files?
When a bank or telecom form asks you to attach a scanned ID card or utility bill, 40 KB is usually enough to keep the printed text sharp while staying under the "file too large" error. It also works well for scanned bank statements uploaded page by page.
Real results when compressing to 40 KB
We measured these results using the exact same compression engine that runs on this site, applied to five public-domain sample images. Each image was compressed to the target size with our quality-search algorithm, and dimensions were reduced only when quality alone was not enough. Your own photo may give different results depending on its content and starting size.
| Sample | Original | Result | Final size (px) | Quality |
|---|---|---|---|---|
| 18 MP DSLR photo | 3.0 MB · 5184×3456 | 39 KB | 1814×1210 * | 48 |
| 10 MP compact camera photo | 2.2 MB · 3648×2736 | 39 KB | 1117×837 * | 45 |
| 10 MP landscape photo | 2.3 MB · 3812×2623 | 39 KB | 661×455 * | 57 |
| Scanned page at 400 dpi | 2.2 MB · 4078×5825 | 40 KB | 634×905 * | 50 |
| Phone screenshot (PNG) | 1.3 MB · 1280×2400 | 40 KB | 642×1204 * | 51 |
* Dimensions were reduced to fit within the size limit.
Each sample was compressed with MozJPEG, the same engine used on this site. We searched for the highest quality level that fits the target size, and reduced dimensions only when quality alone could not reach it. Your photo will give different results depending on its content, colors and original size.
Frequently asked questions
Will the image still look good at 40 KB?
For screen use the result looks good: the tool picks the highest quality that fits, and only reduces dimensions if compression alone is not enough.
Does it change the format of my file?
The output is JPG by default — the format virtually every form accepts — and you can switch to WebP. JPG, PNG, WebP and AVIF are accepted as input.
Is my photo uploaded anywhere?
No. Everything runs locally in your browser with WebAssembly — your image never leaves your device, which makes this safe even for ID photos and documents.
What happens if the target size cannot be reached?
The tool keeps the highest quality it can achieve without going below the minimum quality floor. If the limit is still not met, try converting to WebP first, or reduce the image dimensions before compressing. With very small images or very low size limits, it may simply not be possible.
Are the metadata and GPS location removed?
Yes. Every image is re-encoded from scratch, so the result contains no EXIF data at all. That includes the GPS location, camera model, and any other metadata that came with the original file. What you download is a clean image.
Can I process many photos at once?
Yes, you can drop in a whole batch of photos and process them all at once. When you are done, download everything as a single ZIP file. Everything runs locally in your browser, so none of your photos are ever uploaded to a server.
Other size limits
10 KB15 KB20 KB25 KB30 KB50 KB60 KB80 KB