ConvertPort

Free image optimization

Compress PNG Online

Upload PNG images and apply lossless PNG compression levels while keeping transparency intact.

PNG level 0–9Lossless PNG optimizeKeeps transparency

Select images


JPG, PNG, WebP, HEIC, AVIF, TIFF, GIF, or SVG — always converts to PNG. Up to 10MB per image. Max 5 images.

    PNG compression is lossless — pixel data stays intact while file size drops through better encoding. Ideal for UI assets, logos, and screenshots with transparency.

    How to Compress PNG Online

    1. Upload

      Upload PNG files to compress.

    2. Adjust

      Choose a PNG compression level from 0 (fastest) to 9 (smallest). Optional palette mode can help flat-color graphics.

    3. Download

      Download optimized PNG files.

    When to compress PNG

    • Optimize UI icons and logos for web apps
    • Shrink large PNG screenshots
    • Reduce transparent marketing assets for landing pages

    PNG level guidance

    Level 6 is a balanced default. Use 8–9 when file size matters more than encode speed. For photographic content stored as PNG, consider converting to WebP or JPG on a converter page for much smaller files.

    Your data security and privacy

    ConvertPort is designed with privacy first. When you upload images for conversion, your files are handled securely and are never stored permanently on our servers.

    How we protect your uploads

    • All transfers use HTTPS/TLS encryption, so your images are encrypted in transit between your browser and our servers.
    • Files are uploaded directly to private cloud storage via time-limited presigned URLs that expire after 15 minutes — no public links are ever created.
    • Uploaded files and converted results are automatically deleted within 48 hours. Download links expire after 24 hours.
    • Only validated image formats (JPG, PNG, WebP, HEIC, AVIF, TIFF, GIF, and SVG) are accepted. File type is verified by MIME type and content inspection, not just the file extension.
    • Rate limiting prevents abuse. Security headers including Content Security Policy (CSP) protect against common web attacks.
    • We do not sell, share, or use your images for training or any purpose other than completing your conversion request.

    Data retention policy

    Uploaded source images and converted output files are automatically removed from our systems within 48 hours of upload. Job metadata is purged on the same schedule via database TTL. We do not maintain an archive of your files.

    Security frequently asked questions

    Does ConvertPort store my images permanently?

    No. Your uploaded images and converted files are automatically deleted within 48 hours. We do not keep copies, backups, or archives of your files.

    Can other people access my uploaded images?

    No. Files are stored in private cloud storage with no public access. Only you can download your converted files using the unique, time-limited download link provided after conversion.

    Is my connection encrypted when I upload images?

    Yes. All communication with ConvertPort uses HTTPS with TLS encryption. Your images are encrypted in transit and never sent over an unencrypted connection.

    Frequently asked questions

    Is Compress PNG Online free on ConvertPort?

    Yes. Compress PNG is free with no watermarks.

    Are my images stored on your servers?

    PNG uploads are transferred over HTTPS and deleted within 48 hours after processing.

    Can I process multiple images at once?

    Yes. Process up to 5 PNG files per batch.