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Getting a photo under 150 KB
Profile pictures, student and employee ID uploads, and many online forms cap photos at 150 KB. That is enough for a clear, sharp picture at the size these sites display it.
We resize and re-encode in steps, from 4000 pixels on the longest side down to 800, and keep the largest, highest-quality step that fits under 150,000 bytes.
Tips
- Crop to the part of the photo that matters first. Every pixel you remove is one less that has to be squeezed.
- Photos with lots of fine detail, like foliage or patterned clothes, take more bytes than a plain background.
- A JPEG comes back as a JPEG and a PNG as a PNG, so the file type the form asked for is kept.
Questions
What happens if my photo is already under 150 KB?
It comes back exactly as you uploaded it. Nothing is re-saved, which also means its metadata, such as the date taken or GPS location, stays in the file. Only a photo over 150,000 bytes goes through the lossless re-save and resize steps that drop it.
Will my iPhone photo look dull after compressing it to 150 KB?
It should not. iPhone photos use the Display P3 colour profile, and the resized JPEG carries no profile, so viewers would read the colours as sRGB and show them washed out. We convert the colours to sRGB before saving, so they look the same as in the original.
How does it pick the step that lands just under 150 KB?
File size falls steadily from the 4000-pixel, quality 92 step down to the 800-pixel, quality 35 step. The sizes already measured predict which step lands just under 150,000 bytes. You get the gentlest step found to fit.
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