Compress an image to 400 KB
Get a large photo under 400KB, at full size in most cases. Exact size, JPG output, free, and nothing is uploaded.
Last updated
400 KB is generous for a single image. Phone and camera photos are bigger mainly because they are saved at very high quality for editing, and a small step down in quality is usually enough to fit without anyone being able to tell.
What fits in 400 KB
A photograph up to about 1554 × 1036 pixels at high quality, or 2211 × 1474 at the lower quality most forms accept. That is measured on a detailed outdoor photo; a portrait against a plain wall fits larger.
A signature on white paper up to about 5172 × 1940 pixels, more than any form asks for.
Is 400 KB enough?
A photo on an application form, shown at about 200 × 230 pixels: yes, at high quality.
A profile picture at 400 × 400: yes, at high quality.
A passport photo printed at 35 × 45 mm (413 × 531 pixels at 300 dpi): yes, at high quality.
A photo shown across a phone screen, about 1080 × 720: yes, at high quality.
A photo filling a Full HD screen, 1920 × 1080: yes, at the lower quality forms accept.
400 KB against the sizes either side
The same photograph reaches about 1554 pixels wide at 400 KB, against about 1297 pixels wide at 300 KB. Past this, a photo stops needing to shrink at all for most uses.
Screenshots and PNGs
A screenshot or scan saved as PNG is often several megabytes. Converting it to JPG on its own usually cuts it by most of that; text stays readable at the quality this page picks.
If the website still says the file is too big
This page counts 400 KB as 409,600 bytes. Some sites count it as 400,000, which is a little less. If yours is strict, aim for the next size down.
Questions
How do I compress an image to 400KB?
Add it to this page and press the button. The JPG quality is lowered step by step and, if that is not enough, the pixel size, and the best version under 400 KB is kept. For a typical photo that ends up about 1554 pixels wide.
How many pixels is a 400KB photo?
About 1554 × 1036 at high quality, or 2211 × 1474 at a lower one, for a detailed photograph. A simpler picture fits more pixels in the same size.
Can I compress a PNG or an iPhone photo to 400KB?
Yes. PNG, HEIC and WEBP are all read and saved as JPG. To fit 400 KB, a detailed photo comes down to about 2211 pixels wide at the quality forms accept; a scanned signature keeps up to 5172.
Is my photo uploaded?
No. It is compressed in your browser, on your own device.