Compress PNG to 400 KB

Reduce any PNG image to 400 KB or less, free and private — no sign-up, no watermark.

This tool runs entirely in your browser. Your file never leaves your device — nothing is uploaded to our servers, so confidential documents and photos stay private.

Compress PNG to 400 KB online — free and exact

Need a PNG image under 400 KB? This free tool automatically reduces your PNG until it fits within 400 KB, then lets you download it — tuning quality and dimensions in your browser to give you the sharpest image that still meets your 400 KB target. Reducing a PNG to 400 KB keeps it sharp while making it light enough for fast web pages, email attachments and listing/marketplace uploads that cap image size at 400 KB.

How to compress png to 400 kb

1
Drop your PNG into the box above (or click to browse). It is processed entirely in your browser — nothing is uploaded.
2
Press "Compress to 400 KB". The tool tunes quality and size automatically to fit within 400 KB.
3
Check the achieved size shown once compression finishes.
4
Download your compressed PNG and upload it to your form, profile or listing.

Frequently asked questions

How do I compress a PNG to 400 KB?+

Upload your image above and click "Compress to 400 KB". The tool automatically reduces the dimensions of your PNG until it fits within 400 KB, then offers it for download — all in your browser, nothing uploaded.

Is compressing PNG to 400 KB free?+

Yes — completely free, no watermark, no sign-up and no daily limit.

Will the image quality drop at 400 KB?+

PNG is lossless, so to reach 400 KB the tool reduces the pixel dimensions rather than adding artefacts. The image stays crisp at its new size. For smaller files at full resolution, try the JPG or WebP version of this tool.

Is it safe to compress private photos to 400 KB here?+

Yes. Everything runs in your browser — your PNG never leaves your device and is never sent to any server, so ID and passport photos stay private.

What if my PNG can't reach 400 KB?+

Very large or detailed images may not reach 400 KB while staying usable. The tool then produces the smallest usable version and shows the achieved size — crop the image or pick a slightly larger target to get under 400 KB.