Threshold Image
Convert an image to high-contrast black and white with a threshold slider.
Processing: in your browser (nothing uploaded)
About Threshold Image
Threshold Image on FileToolsHub is a free online image tool.
Convert an image to high-contrast black and white with a threshold slider.
It is built for creators editing images without desktop software.
Privacy-first: Threshold Image processes data locally in this tab, so tokens, notes, and files stay on your device.
How to use Threshold Image
- 1
Upload an image.
- 2
Set the threshold.
- 3
Download the PNG.
Why use Threshold Image
- Browser-only
- Stencil-ready
- No upload
- Private
Use cases
- Edit or convert images with Threshold Image and download the result
- Prepare assets for web, email, or social without desktop editors
- Keep originals when quality matters for print later
Privacy
Threshold Image runs entirely in your browser on FileToolsHub. Your image is processed in this tab and is never uploaded to our servers.
That means passwords, tokens, personal notes, and documents you paste or load stay on your device. Clear the page or close the tab when you are finished on a shared computer.
You still need a network connection to load the page the first time. After that, the core processing for Threshold Image does not require sending your content to FileToolsHub.
Limitations
- Threshold Image depends on your browser. Very large inputs may slow or freeze older devices; try a smaller sample if the tab becomes unresponsive.
- Browser canvas export has color-profile and format limits. Extremely large photos may need resizing first.
- Threshold Image does one focused job. For multi-step workflows, use the related tools below or the Image Tools hub.
Threshold Image FAQ
Uploaded?
No.
vs Grayscale?
Threshold forces pure black/white; grayscale keeps midtones.
Is Threshold Image free?
Yes. Threshold Image on FileToolsHub is free for everyday use with no account required for standard jobs.
How do I use Threshold Image?
Upload an image. Set the threshold. Download the PNG.
Does Threshold Image work on mobile?
Yes. Threshold Image works in modern mobile and desktop browsers. Large files may be slower on limited connections.
What output does Threshold Image produce?
Threshold Image produces Threshold PNG. Download or copy when the preview looks right.
What are the limitations of Threshold Image?
Threshold Image depends on your browser. Very large inputs may slow or freeze older devices; try a smaller sample if the tab becomes unresponsive. Browser canvas export has color-profile and format limits. Extremely large photos may need resizing first.
Related tools
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