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Compress PNG

Compress PNG images online for free. Reduce file size while preserving transparency and sharp edges. No signup required.

Drop files here or click to upload

PNG · up to 20.0 MB per file

Files are private and deleted after conversion

How to use Compress PNG

  1. 01

    Upload your PNG

    Add the PNG you want to shrink — screenshots, transparent graphics and icons all work well.

  2. 02

    Choose a quality level

    By default the tool compresses lossily: palette quantization rebuilds the PNG with a reduced color palette for a much smaller file (default quality 80; lower values shrink it further). Prefer no quality loss? Turn on the Lossless toggle instead — the PNG stays byte-for-byte lossless, though the file will be larger.

  3. 03

    The server requantizes the file

    In the default lossy mode the PNG is rebuilt with a reduced color palette to cut its file size sharply; with Lossless on it is re-compressed with no quality loss. Either way the transparency is kept intact.

  4. 04

    Download the optimized PNG

    Save the smaller file — it is still a standard PNG and keeps its transparency.

Why choose our Compress PNG

Keeps transparency and stays a PNG

Palette quantization shrinks the file while keeping the PNG format and its transparency, so flat graphics, screenshots and icons still look crisp.

Dramatic shrinkage when you want it

The default lossy palette quantization often cuts PNG size far more than a plain re-save can. Prefer to keep every pixel exact? Flip on the Lossless toggle for a no-quality-loss result — larger, but pixel-perfect. The choice is yours per file.

Encrypted upload, automatic cleanup

Uploads travel over HTTPS, and both the original and optimized PNG are deleted automatically within 24 hours.

Free to start

Anonymous visitors get 1 free server-side compression, and free accounts receive 3 conversions every 30 days.

Works on any device

No app to install — compress a PNG straight from the browser on your phone, tablet or desktop.

Settings guide

Quality (1–100, default 80)
Applies in the default lossy mode: the PNG is rebuilt with palette quantization — a reduced color palette that shrinks PNG files dramatically. The default of 80 keeps colors looking close to the original for most graphics; lower values shrink the file further at the cost of some color fidelity. The quality slider is hidden while the Lossless toggle is on.
Lossless (optional toggle)
Turn on the Lossless toggle to compress the PNG with no quality loss at all — every pixel and color is preserved byte-for-byte. The file is larger than the lossy palette-quantized result, so choose this when color fidelity matters more than size. Leave it off (the default) for the smallest file.

About the formats

PNG

PNG is a lossless raster image format created in the mid-1990s as a patent-free replacement for GIF. It is the standard choice for screenshots, logos, UI graphics, and any image that needs transparency.

PNG preserves every pixel exactly and supports a full 8-bit alpha channel, so text and sharp edges stay crisp. The downside is size: photographs saved as PNG are far larger than the same image as JPG or WebP. Support is universal in browsers and editors, making it a safe default for graphics — just avoid it for large photo collections.

Troubleshooting

The colors changed slightly after compression
That is the trade-off of palette quantization: the image is mapped to fewer colors. Flat UI graphics usually look identical, while photos and subtle tints may shift a little. Raise the quality to keep more colors, or convert photos and gradient-heavy images to WebP with the Image Converter.
Gradients and shadows show visible banding
Smooth transitions are the hardest case for a reduced palette. Use a higher quality, or convert gradient-heavy images to WebP with the Image Converter — it handles gradients far better at small sizes.
My PNG barely shrank
PNG stores photographic content very inefficiently, so even palette quantization has limited room on photos. Lower the quality for a more aggressive palette, or — if the image is a photo without transparency — convert it to JPG or WebP with the Image Converter for a far bigger reduction.

FAQ

Does compressing PNG keep transparency?
Yes. Our compressor preserves the alpha channel so transparent backgrounds and semi-transparent elements remain intact.
Is the conversion private?
Yes. Your files are processed securely and deleted after conversion. We never share your photos.
Is there a file size limit?
Free accounts can upload files up to 50 MB. Paid users can upload up to 200 MB.
What's the difference between leaving quality empty and setting a value?
Leaving it empty gives lossless optimization — the PNG is restructured without changing a single pixel. Setting a quality enables lossy palette quantization, which rebuilds the image with a reduced color palette for much bigger savings.
Why did the colors shift slightly after compression?
That's the trade-off of palette quantization: with a quality set, the image is mapped to fewer colors. Raise the quality, or clear it entirely to compress losslessly.
Why do gradients show banding after compression?
Smooth transitions are the hardest case for a reduced palette. Use a higher quality, clear it to compress losslessly, or convert to WebP instead — it handles gradients far better at small sizes.
Can I compress multiple PNGs at once?
Signed-in users can batch-compress up to 5 files on the free plan and up to 100 on a paid plan, downloaded together as a ZIP.

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