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Compress PNG to 300 KB

Hit a 300 KB limit exactly — with smart format handling so small targets are actually reachable. Free, private, in your browser.

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JPG · PNG · WebP · HEIC · HEIF — processed privately in your browser

Format
Quick targets:

Your compressed images appear here. Nothing is uploaded — everything runs on your device.

Quick answer

To compress a PNG to 300 KB, upload your file above and FitToKB binary-searches the encoder quality to land at or just under 300 KB — never over. It runs entirely in your browser, free, with no signup and no upload.

300 KB is typically enough for a high-quality web photo or a detailed scan. FitToKB guarantees the result never exceeds 300 KB, so your upload form will accept it.

Note on PNG: PNG is lossless, so the browser ignores quality settings — tiny targets like 300 KB usually can’t be reached as a true PNG. For photos, FitToKB converts to WebP or JPG (which compress) to hit 300 KB; for graphics it resizes instead. You always get a file at or under 300 KB.

Nearby targets

TargetGood forGo
200 KBa high-quality web photo or a detailed scanCompress to 200 KB
300 KBa high-quality web photo or a detailed scanThis page
← 200 KB

Frequently asked questions

How do I compress a PNG to 300 KB?
Upload your file to the tool above, keep the target at 300 KB, and download. FitToKB automatically finds the highest quality that stays at or below 300 KB.
Will the file go over 300 KB?
No. The engine only returns a result at or below 300 KB. If 300 KB is very small for the image, it lowers quality and, where allowed, resolution, and tells you if the target can’t be reached.
Does compressing to 300 KB reduce quality?
Some quality is traded for size, but FitToKB always uses the highest quality that fits 300 KB, so the loss is the minimum required to meet your target.
Can a PNG really be 300 KB?
PNG is lossless, so small targets like 300 KB often aren’t reachable as PNG. For photos, FitToKB automatically switches to WebP or JPG (which support real compression) to hit 300 KB while keeping it sharp.
Is my PNG image uploaded to a server?
No. Everything runs in your browser. Your file never leaves your device and nothing is stored.

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Free forever. No signup, no watermark, no upload. Everything runs on your device.

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