How to Compress PNG Images Online in 3 Easy Steps
Our online PNG compressor lets you reduce PNG file sizes individually or in bulk while preserving transparency. Choose lossy or lossless compression to get the file size and image quality you need.
Choose PNG Images
Select PNG images from your device, choose a folder, or drag and drop multiple files into the browser.
Choose Lossy or Lossless Compression
Adjust the PNG quality for a smaller file, or enable lossless compression to reduce file size without losing quality.
Compress and Download
Click “Compress” to start. When compression is complete, download one compressed PNG or save all images in a ZIP file.
How Does the CompressFly PNG Compressor Work?
The CompressFly PNG compressor lets you compress PNG images directly in your browser. Choose lossy compression and adjust the image quality for smaller files, or enable lossless compression to reduce file size without losing quality. Your PNG files are processed locally, individually or in bulk, while transparency is preserved.
What "in your browser" means
- No PNG files are sent to a server
- No remote storage
- No external access to your files
- Compression runs locally on your device
Free Bulk PNG Compressor Online
Compress 300+ PNG images at once with our free bulk PNG compressor. Reduce transparent graphics in large batches with lossy compression, or enable lossless mode to reduce file size without losing quality.
Everything runs locally in your browser, so your PNG files never leave your device. Compress PNG images individually or in bulk without server uploads, software installation, or signup.
Why Use CompressFly to Compress PNG Images Online?
Flexible PNG Compression
Choose lossy compression for smaller files or lossless compression to reduce file size without losing quality.
Transparency Support
Reduce PNG file size while retaining the transparent areas used in graphics, logos, and interface assets.
Batch PNG Compression
Process 300+ PNG images at once and download the compressed batch in a ZIP file.
Before-and-After Preview
Compare PNG images before and after compression, then review output quality and file size before downloading.
Private & Secure
Your PNG images never leave your device. All compression happens locally, with no uploads to a server.
Free Access
Use the free PNG compressor without signing up, installing software or entering credit card details.
Free PNG Compressor FAQ
How do I compress PNG images online?
Use this online PNG compressor in three steps: 1. Select or drag and drop one or more PNG images into the browser. 2. Choose lossy or lossless compression, then click “Compress.” 3. Download one compressed PNG or save all compressed images in a ZIP file.
Is CompressFly’s PNG compressor free to use?
Yes. It’s free to use, with no daily limits or watermarks. No account or credit card is required.
Can I compress PNG files without losing transparency?
Yes. PNG transparency is preserved during compression, so transparent backgrounds remain transparent in the compressed image.
Can I compress PNG images without losing quality?
Yes. Enable lossless compression to reduce PNG file size without losing quality. Lossless compression may produce a larger file than lossy compression.
What is the difference between lossy and lossless PNG compression?
Lossy compression can produce smaller files with some quality loss. Lossless PNG compression reduces file size without losing quality, although the size reduction may be smaller.
Can I compress PNG images in bulk?
Yes. Add PNG images individually or select an entire folder, apply your compression settings, then download results individually or save the completed batch as a ZIP file.
Are there any limits on PNG compression?
No. You can compress as many PNG images as you need, with no maximum file size or daily limits. Very large files or batches may take longer depending on your device.
Can I compress a PNG to an exact KB size?
This PNG compressor reduces file size based on your selected quality or lossless setting rather than guaranteeing an exact output size. Use the dedicated Resize Image to KB or MB tool when a specific KB or MB limit is required.
Are my PNG images uploaded to a server?
No. CompressFly compresses PNG images directly in your browser, so your files never leave your device or get uploaded to a server.