PNG image repair tool

The best tool to repair and fix your corrupted or broken PNG images.

  • Made in Germany
  • EU GDPR compliant
  2. Drag & Drop

    Drag your image file onto this website. You can do this anytime.

  3. Paste image URL

    Paste an image URL from your clipboard into this website. You can do this also on the image processing page.

  4. Paste Base64 Data URI

    Paste a Base64 Data URI from your clipboard into this website. You can do this also on the image processing page.

  5. Paste image data

    Paste an image from your clipboard into this website. You can do this also on the image processing page.

Allowed file formats: PNG (max. 8 MiB)

Features

  • Removes invalid chunks
  • Converts Apple's proprietary PNG extension (with a CgBI chunk) back to a general readable PNG
  • Discards invalid data after an IEND chunk
  • Corrects incorrectly specified IHDR chunk (width, height, color type, bit depth etc.)
  • Corrects incorrect CRC checksums
  • Extends cropped PNGs with dummy data to create a complete image again
  • Corrects wrong filter values in the IDAT chunk
  • Replaces incorrectly used CRC checksum in the Deflate stream with an ADLER32 checksum
  • … much more

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Why should I use this image repair tool?

Many other tools that try to repair corrupted PNG images use only very simple mechanisms to recover the image data, so unfortunately they often fail.

This tool tries to recover a valid image even if only the pure data section (IDAT chunk) of the image is left. The other data needed to display the image (IHDR chunk) is determined via heuristics. Even in the case of an incomplete data section, the data is adjusted in such a way that a valid image can be generated again with a large part of the recovered image data.

In this way, it is often even possible to recover image data that has been intentionally disturbed, e.g. in the context of a CTF photo forensics competition.

ArticleThe big image compression tool comparison

Logos of compress-or-die, optimizilla, JPEGmini, Compressor.io, tinyjpg, kraken.io

There are a lot of articles about online image compression tools in the net, most of them are very superficial. Usually they end with a simple: "It generates smaller pictures, so it's got to be better."

Learn why such statements are most of the time meaningless, understand the technical background, and find out which tool you should use as of today.

18 min read

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News
Christoph Erdmann
Stability issues
2023-05-11

For about a week, there have been stability issues that have caused COD to be temporarily unavailable. I will continue to monitor and analyze the problem.

Check out our Reddit channel if you want to comment on the news.