Repair your PNG Online

Do you have a PNG image file that will not open or display correctly? If so, our free-to-use PNG repair tool may be able to help. Our tool analyses the content of your PNG image file and is able to determine if the file pixel data is valid. Our tool will let you know what is wrong with your PNG file and attempt to fix it.

Or drag and drop your files here to upload.
A maximum of 20 files can be uploaded at once.

Please note: Your PNG, once uploaded to our server, will be deleted 15 minutes after upload.
If our tool offers the option to repair your file, please ensure you download the repaired file within this time period.

How to Repair your PNG Online?

Here are 3 simple steps to repair your PNG using our fast and free repair tool.

Upload your PNG

Click the "Select File" button, then select a PNG file. The maximum file size is 100MB.

Analysis and Repair

Your PNG file will be analysed, and our tool will attempt to repair your PNG file if possible.

Repair or Convert your PNG

Select an option to either repair or convert to receive your repaired PNG file.

Frequently Asked Questions

Will the resolution and quality of the PNG file be affected?

No. Our PNG repair tool will not adjust the resolution or quality of the repaired image file.

Is it free to use the PNG file repair tool?

Yes! Our PNG repair tool is 100% free to use.

Are there any usage limits when repairing my PNG file?

No, you can repair as many files as you wish. We do not have any limits when using our PNG repair tool.

How long does it take to repair my PNG?

We aim to process PNG repairs as quickly as possible; this usually takes around 5 seconds; however, this may be longer depending on the file size and data needed to be repaired.

What does the PNG repair process involve?

Once your PNG has been selected, it will undergo some initial checks to verify that the file has some basic information. If the initial checks pass, we then upload the file to our servers for more detailed analysis.

Is it safe to repair my PNG on

Yes, of course it is! Your PNG, once repaired, is deleted 15 minutes after upload, and any download link will expire after this time.

Can I repair my PNG on Windows, Linux, Android, iOS or Mac OS?

Yes! Our PNG repair tool will run on any system with a modern web browser.

PNG file format information

Full NamePortable Network Graphics
Mime Typeimage/png
Opens WithPaint.Net, Photoshop

PNG files are a widely used graphics file format used in areas where high-quality images (often with transparency) are required while also retaining a small file size. They are one of the most common formats of file used for web and print mediums and are particularly useful for logos, icons, and other images where multi-level transparency is desired.

The format itself was created in the 1990's with the main aim of storing computer graphics in a high-quality format while minimizing the required storage space. The longer-term aim was to displace the GIF file format and make PNG the number one format for non-lossy, high-quality image formats on the then-burgeoning world wide web.

One of the selling points of the PNG format is its support for multiple levels of transparency, making it superior to the GIF format, which can only handle a single level of transparency. Also, like GIFs, the PNG format supports palletizing image colors down to 256 or 16 colors to help reduce the file size of the PNG.

Repairing a PNG File

PNG Image File Header Data

The data contained within a PNG image file is binary, and it is the first sequence of bytes within the file that contains the header data for the image, which contains information such as image width, height, color depth, palette, and other metadata.

Knowing how this header data is formed and what the header data should be for each individual file type allows our tool to not only ensure the file is using the correct file extension but also that all the expected pixel data is present and correct.

Pixel Color Depth and Palettes

Certain image file formats (oftentimes, but not always, older formats), such as PNG, can store pixel data using a reduced number of bits per pixel. For regular full-color images, these are stored at 24-bits per pixel (1 byte per RGB channel, equating to roughly 16 million colors). Storing pixels using reduced bits per pixel can help reduce the final file size, and older legacy hardware was often limited by the color depth of their displays anyway, making this practice worthwhile.

Palettes are also commonplace, allowing a limited number of colors to be used from the full 16 million color space. The PNG often does this to significantly reduce file size while retaining pixel and color detail. During the validation and repair process, our tool will not alter the pixel color depth or, if present, any palette used by the image.

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