Choose Files:


Drop PNG files here
(Up to 100 images, 40 MB each.)

Compression Settings:

Output Files:

To compress all output files in a ZIP file, click "" icon on the right, then click "Add to ZIP". To download one single file, simply right-click on file link and click "Save link as...".

File Name Original Size Output Size Size Compressed Actions

How to compress PNG files:

  1. Settings

    Set PNG quality first. PNG quality value can be 1 (lowest image quality and highest compression) to 100 (best quality but least effective compression).

  2. Add Files

    Drag multiple PNG files to the "Choose Files" section. Each PNG file size can be up to 40 MB.

  3. Compress Files

    The batch compression automatically starts when files are uploaded. Please be patient while files are uploading or compressing.

  4. Output Files

    The output files will be listed in the "Output Files" section. To compress all output files in a ZIP file, click "" icon on the right, then click "Add to ZIP". You can right-click on file name and click "Save link as..." to save the file. The output files will be automatically deleted on our server in two hours, so please download them to your computer or save them to online storage services such as Google Drive or Dropbox as soon as possible.

About:

Use this PNG compressor to compress PNG images for displaying on website, sharing on social media or sending by email.

Portable Network Graphics is a raster-graphics file-format that supports lossless data compression. PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF). PNG uses DEFLATE, a non-patented lossless data compression algorithm involving a combination of LZ77 and Huffman coding. Compared to formats with lossy compression such as JPG, choosing a compression setting higher than average delays processing, but often does not result in a significantly smaller file size (less than 10% smaller in our tests).

Even though PNG has been designed as a lossless format, PNG encoders can pre-process image data in a lossy fashion (so as to reduce colors used) to improve PNG compression. This online PNG compressor significantly reduces file size by converting image to a more efficient 8-bit PNG format with alpha channel (often 60-80% smaller than 24/32-bit PNG files). Compressed PNG images are fully standards-compliant and are supported by all web browsers and operating systems.

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Aconvert.com is a sister website of Compresss.com, it focuses on converting files instead of compressing files.