Removing color can do a lot for a photo. It hides a distracting red sign, makes mixed lighting look consistent and puts the attention on shapes and faces. The same tool also helps with practical jobs, such as turning a phone photo of a signature into crisp black ink on white paper for an online form.
All processing happens in your browser; your photos are not uploaded.
How to use it
- Add one or more photos.
- Choose an effect: Grayscale, Sepia, High-contrast B&W, Threshold, Negative or Duotone.
- Fine-tune it. Grayscale and sepia have an intensity slider (0–100%), threshold has a threshold slider, and duotone has two color pickers.
- Compare the before and after views in the live preview of the first photo.
- Download one file or all of them as a ZIP. Each file keeps its original format.
The effects explained
Grayscale converts each pixel by its luminance, weighting green more than red and blue because our eyes are most sensitive to green. That is why the result looks natural rather than flat, as a simple average of the three channels would. Setting the intensity below 100% leaves a little color in, for a muted, faded look.
Sepia gives the warm brown tone of old prints. It suits portraits and travel photos with old buildings; at lower intensity it acts more like a gentle warm filter.
High-contrast B&W pushes the darks deeper and the lights brighter. It works well for street photos, architecture and anything with strong shapes, but it can lose detail in shadows.
Threshold turns every pixel into pure black or pure white. Pixels darker than the slider value become black, the rest become white. This is the effect for signatures, handwritten notes and text documents.
Negative inverts all tones. If you photograph a black-and-white film negative on a light panel, inverting it gives a quick preview of the picture. Color negatives have an orange base, so a simple inversion looks strongly tinted.
Duotone maps the dark tones to one color and the light tones to another. Navy and cream, or deep purple and pink, give poster-like images that fit a brand palette.
Getting a clean signature for an online form
- Sign on plain white paper with a dark pen and photograph it in daylight, holding the phone parallel to the paper.
- Crop tightly around the signature with Crop image.
- Choose Threshold and move the slider until the paper turns completely white and the strokes stay solid, without gaps.
- If the form has a file size limit, finish with Compress to a target size.
The same steps work for scanned pages that came out gray or uneven. For photos that only need a little more light or contrast in color, use Brightness and contrast instead.
Frequently asked questions
Can I turn a black and white photo back into color?
Not with this tool. Once the color information is removed, it is gone from that file. Your original stays on your device, so keep it if you might need the color version later.
Which effect should I use for scanned documents?
Threshold. It removes gray paper tones and shadows and leaves crisp black text on a white background. Adjust the slider until thin lines are still visible.
Can I apply the same effect to many photos?
Yes. Add several photos and the chosen effect and settings are applied to all of them. You can download the results together as one ZIP file.
Does it make the file smaller?
Not necessarily. The file is saved in its original format, and the size depends on the content. A threshold image saved as PNG is often small, but there is no guarantee.