What does Grayscale Image do?
Grayscale Image is a free online tool that can convert image to black and white grayscale. The PNG result from Grayscale Image is a separate copy to inspect before you use it elsewhere. One possible use is photos prepared for a monochrome design.
Grayscale format change removes color distinctions and represents the image in gray tones. It is useful for a monochrome design or to check whether a graphic still communicates without its original palette.
A red and green label that looked different in color may become harder to distinguish in gray. Review the information carried by color before changing, and keep the original for apps where those distinctions matter.
A gray image stores tones instead of a full set of colors. Two colors can map to similar brightness.
A legend may then stop showing which line belongs to which group. Check that labels still make the picture clear.
Use the original when color carries information that gray tones cannot show. For owned artwork explored as a black-and-white composition, choose a copy whose source content suits that purpose. Keep a local source for another trial.
Turn a picture into grayscale online: steps
Before using Grayscale Image, decide what the new copy must contain and where it will be used. Identify color-dependent labels and choose a picture where a monochrome copy serves a clear purpose. Review the upload area and all values required by the current Grayscale Image form.
Choose the source
Check a chart legend against its gray plot lines. For Grayscale Image, choose one source from your device. Keep a source copy for another attempt.
Review the form values
The Grayscale Image form has no extra task settings. Check the source in the file area.
Run the file task
Use Process Grayscale Image after checking the source and form values. Wait for the job to finish. An error means this attempt failed.
Save and check the output
Check contrast between adjacent regions, chart keys, photos and small captions. Store the output on your device. Name this copy separately from the original.
Gray tones: uses for Grayscale Image
Grayscale Image can help with charts checked for color-independent readability. It can also be used for scanned images tested before printing in gray. The PNG result from Grayscale Image must suit the intended reading or editing step, so keep the source until that check is complete.
- Photos prepared for a monochrome design.
- Charts checked for color-independent readability.
- Scanned images tested before printing in gray.
- Owned artwork explored as a black-and-white composition.
Formats and limits for Grayscale Image
The Grayscale Image form accepts the image formats in the table sources. Each Grayscale Image upload can be up to 300 MB, which equals 300 MiB. The allowed suffixes on the Grayscale Image page do not prove that a source has valid content inside it.
| Accepted formats | Maximum file size | Output |
|---|---|---|
| JPG, JPEG, PNG, WEBP, BMP, TIFF | 300 MB per file (300 MiB upload limit) | PNG |
Grayscale is not the same as a two-color black-and-white threshold. It does not promise smaller file size or improved legibility for every source.
How this tool works
Grayscale Image uses ImageMagick to handle the source on the server. The Grayscale Image request uses your chosen input rather than any local editing project left on your device. Check the PNG contents produced by Grayscale Image before treating them as ready for another app or reader.
For Grayscale Image, your browser uploads the source to our file-processing server. This is a server task, not local editing.
Files are due for deletion within 1 hour. Cleanup runs during normal service operation. Keep a local download for future use.
Grayscale Image questions and answers
If Grayscale Image gives an unexpected result, start by checking the source type and the values used in the form. Check the PNG contents from Grayscale Image as well as the filename or displayed message. For another result type, compare Grayscale Image with the separate tools described in these answers.
What matters when using Grayscale Image?
Look for lost separation between colored map regions. View that area at its intended display size. Note any differences that affect your purpose.
Why try Sepia Effect?
Sepia Effect offers another task beside Grayscale Image: apply vintage sepia tone to your image. Sepia Effect returns JPG. The stated PNG output from Grayscale Image matches a listed input type for Sepia Effect.
Why try Invert Colors?
Invert Colors offers another task beside Grayscale Image: invert all colors in an image (negative effect). Invert Colors returns PNG. The stated PNG output from Grayscale Image matches a listed input type for Invert Colors.
Why try Adjust Brightness?
Adjust Brightness offers another task beside Grayscale Image: increase or decrease image brightness. Adjust Brightness returns PNG. The stated PNG output from Grayscale Image matches a listed input type for Adjust Brightness.
What if my PNG result does not open?
For a failed Grayscale Image result, first confirm that the download completed and that the viewer supports PNG. Try another local viewer for that format.
Record any error message for support. Keep private source material out of the report.
How do I report a problem with Grayscale Image?
Contact support with the Grayscale Image page name, source format and the error you saw. Mention any relevant form settings you chose. Do not send passwords or private attachments.