Compress image to 400 KB
Need an image under 400 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 400 KB limit is reached
PhotoReducer tries different quality levels and keeps the best one whose file stays under 400 KB. Most photos reach this limit through compression alone, keeping their original dimensions.
Who asks for 400 KB files?
Editorial blog headers, portfolio hero images, and press kit photos need enough resolution to hold up on a large monitor without dragging down page load times. 400 KB keeps gradients and fine detail smooth for photography-heavy sites that still care about Core Web Vitals.
Real results when compressing to 400 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 | 387 KB | 5184×3456 | 51 |
| 10 MP compact camera photo | 2.2 MB · 3648×2736 | 392 KB | 3648×2736 | 70 |
| 10 MP landscape photo | 2.3 MB · 3812×2623 | 397 KB | 2198×1513 * | 48 |
| Scanned page at 400 dpi | 2.2 MB · 4078×5825 | 384 KB | 2963×4233 * | 48 |
| Phone screenshot (PNG) | 1.3 MB · 1280×2400 | 347 KB | 1280×2400 | 95 |
* 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 400 KB?
At this size the difference from the original is usually invisible on screen — most photos keep their full dimensions.
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
100 KB120 KB150 KB200 KB250 KB300 KB500 KB600 KB