Compress PNG Images Online
Shrink PNG files by up to 60% — transparency preserved, no signup.
Compress JPG, PNG, SVG, WebP images
Up to 10 images at a time, max 5 MB each
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Format is locked while images are being compressed
PNG is a lossless format, which is exactly why PNG files get so large. Every pixel is stored precisely, and exports from design tools carry colour data and metadata the web never needs. imgBoost strips that overhead and re-encodes the image, so the PNG you download looks identical but weighs far less.
How PNG compression works
Most of the weight in a typical PNG is colour information the image does not actually use. A logo with eight flat colours is often exported with a full 24-bit truecolour palette, plus embedded colour profiles, editor metadata and timestamps. Reducing the palette to only the colours present, then re-compressing the pixel data more efficiently, routinely halves the file with no visible change. Because the transparency channel is preserved throughout, the result drops straight into the same place in your design.
Best uses for PNG
- Logos, icons and app assets
- Screenshots and UI mockups
- Line art, diagrams and charts
- Any image that needs a transparent background
When PNG is the wrong choice
PNG is a poor fit for photographs. A photo saved as PNG is frequently five to ten times larger than the same photo as JPEG or WebP at indistinguishable quality, because lossless compression cannot exploit the subtle gradients photographs are made of. If your image is a photograph and does not need transparency, convert it to WebP or JPEG instead of compressing it as PNG.
PNG compression FAQs
Does compressing a PNG lose quality?
Visually, no. imgBoost reduces the colour palette to the colours actually present in your image and re-encodes the pixel data more efficiently. For logos, icons and screenshots the result is indistinguishable from the original. Images with smooth gradients across many colours are the exception, and are usually better served by WebP.
Is transparency preserved when I compress a PNG?
Yes. The alpha channel is kept intact, including partial transparency and anti-aliased edges. Your compressed PNG will sit on any background exactly as the original did.
Why is my PNG so large in the first place?
Design tools export conservatively. A PNG from Figma, Illustrator or Photoshop typically includes a full truecolour palette regardless of how few colours the artwork uses, plus an embedded colour profile and editor metadata. None of that is needed to display the image in a browser.
Should I use PNG or WebP?
WebP is smaller than PNG for almost every image type and supports transparency too, so it is the better default for the web. PNG remains worth keeping when you need guaranteed support in older software, or when the file is a source asset rather than something you are shipping to a browser.
How many PNGs can I compress at once?
Up to 10 images per batch, each up to 5 MB. There is no limit on how many batches you run, and no account is required.