Compress PNG to 150KB Online
Drop your PNG — it lands at 150KB automatically, ready for upload.
100% in your browser — files never uploaded
Why 150KB is a common upload limit
A 150KB ceiling shows up across general web uploads and social-profile photos where portals allow more room. This page opens directly in Target Size mode with 150KB pre-filled, so there's no slider to guess with — drop your PNG and download.
How the 150KB target is reached
PNG has no quality knob to lower, so the engine hits the target by shrinking pixel dimensions in rounds until the file fits, re-encoding until the file lands at or just under 150KB — this ceiling is loose enough that compression is almost invisible on any photo.
Need a different KB target?
If your portal asks for a different limit, the Target Size field stays fully editable — type any other KB value instead of the 150KB this page starts with.
Compress PNG to 150KB in One Step
This tool is Compress PNG pre-set to a 150KB target, so there's no mode to switch and no slider to guess with — drop your file and PNG has no quality knob to lower, so the engine hits the target by shrinking pixel dimensions in rounds until the file fits. Everything happens locally via the Canvas API, so photos and ID documents never leave your device.
When 150KB Is the Number a Portal Asks For
A 150KB ceiling shows up repeatedly across general web uploads and social-profile photos where portals allow more room — files over it are rejected outright, often without saying by how much. Rather than repeatedly saving at guessed quality settings, this page starts already locked to 150KB, so the first attempt is the only attempt needed. That makes this page a poor fit for photographic PNGs at very small targets — screenshots, logos and flat-color graphics reach small sizes cleanly, but a photo saved as PNG may need converting to JPG first to hit tight limits without losing resolution.
Switching Targets or Formats
If your form specifies a different KB limit, the Target Size field on this page stays fully editable — type any value and the same search applies. For format conversion or batch processing multiple files, the full Compress PNG tool covers the same engine with every mode exposed.
Frequently asked questions
How do I compress a PNG to exactly 150KB?
Drop your PNG here — Target Size mode is already set to 150KB, so the tool immediately searches for the largest file that still fits under that limit.
Will my PNG be uploaded to a server?
No. Compression runs entirely in your browser using the Canvas API — the file never leaves your device.
Can I change the target away from 150KB?
Yes — the Target Size field stays editable, so you can type any other KB value if a different portal needs it.
Will compressing to 150KB visibly hurt quality?
This ceiling is loose enough that compression is almost invisible on any photo; the live preview shows the exact result before you download.
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Data verified: 2026-07-17 · All processing happens in your browser — no files are ever uploaded.