How does PNG compression work?

PNG compression reduces file size by optimizing the encoding. At lower quality settings, the image may be converted to a lossy format for maximum compression.

Is quality preserved?

At high quality settings, the visual difference is minimal. Lower settings trade quality for smaller file sizes.

Compress PNG Images Online for Free, Smaller Files

Compress PNG images to reduce file size for web and email. Files are processed entirely in your browser. Free, no sign-up, no upload to servers.

100% free and unlimited, with no sign-up, no watermarks, and no 5-file paywall. Files are processed locally in your browser and never leave your device.

How to use this tool

Add your PNG images
Adjust the compression quality slider
Download your compressed PNG files

Key facts

Tool: Compress PNG
Price: Free
Sign-up: No
Watermark: No
Processing: In your browser

When to use Compress PNG

Compress PNG helps with website uploads, email attachments, social media assets, marketplace product photos, profile images, screenshots, and design handoffs where the receiving app expects a specific image format or size.

Privacy, limits, and output quality

The file work happens in your browser. Your file is not uploaded to FilesFlow servers, which keeps private documents faster to process and easier to control.

For best results, keep the original image, convert from the highest-quality source you have, and review transparency, sharp edges, and file size before sharing. Converting a low-quality image to another format cannot restore detail that was already lost.

How Image Tools work stays simple

Use this tool when you need a fast format or size fix in the browser. For advanced retouching, layered edits, color-managed print work, or manual background cleanup, finish the file in an image editor.

Compress PNG for real workflows

Compress PNG helps prepare photos, screenshots, product images, icons, blog graphics, and design assets for the format or size another app expects.
Use it before website uploads, email attachments, marketplace listings, social previews, and quick image handoffs.
It is a practical option when compatibility matters more than manual image editing.

Checklist before using Compress PNG

Start with the best source image you have.
Review sharpness, transparency, colors, and file size after processing.
Keep the original file if you may need a higher-quality export later.

Compress PNG vs heavier alternatives

Compress PNG is made for quick browser-based image work. Use a dedicated image editor when you need layers, masking, retouching, manual cropping, or print color controls.

Useful next tools

Frequently asked questions

How does PNG compression work?: PNG compression reduces file size by optimizing the encoding. At lower quality settings, the image may be converted to a lossy format for maximum compression.
Is quality preserved?: At high quality settings, the visual difference is minimal. Lower settings trade quality for smaller file sizes.