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Threshold

Convert to black and white using threshold

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image/jpeg · image/png · image/webp image/jpeg · image/png · image/webp

What does Threshold do?

Convert to black and white using threshold Supports JPEG, PNG, WEBP formats. All processing happens locally — your images never leave your device.

Input

image/jpeg, image/png, image/webp

Output

image/jpeg, image/png, image/webp

Processing

In your browser — images never leave your device

How to use Threshold

  1. 1

    Upload

    Select or drag and drop your image. Supports JPEG, PNG, WEBP formats.

  2. 2

    Configure

    Adjust the tool settings as needed for your image.

  3. 3

    Process

    Click the process button to transform your image.

  4. 4

    Download

    Download your processed image.

Features

  • Browser-based processing
  • No file upload to server

Why use Threshold?

Your image is processed entirely in your browser using the Canvas API. No files are uploaded to any server. Once you close the tab, all data is removed.

Web Use

Process images for web publishing.

Sharing

Prepare images for sharing.

Editing

Edit images for your projects.

Pro tips for Threshold

Adjust in small steps

Large slider jumps clip highlights and crush shadows irreversibly. Nudge 5–10% at a time and watch the histogram if one is available.

Work from a copy

Every lossy re-save degrades the image a little. Keep the untouched original so you can restart without stacking artifacts.

Combine effects in one pass

Applying several filters in a single operation avoids repeated re-encoding. Chain your adjustments, then download once.

Fix basics first, style second

Correct exposure and white balance before creative effects — otherwise the effect amplifies underlying color casts.

Preview on multiple screens

A phone OLED exaggerates saturation; an office monitor washes it out. Check the result on a second device before publishing.

Troubleshooting Threshold

⚠️ The result looks blurry or low quality

Most often the source image was small or heavily compressed to begin with — processing cannot recreate detail that is not there. Start from the highest-quality original you have, avoid enlarging beyond 100%, and use a lossless output (PNG) when edges must stay sharp.

⚠️ My JPEG file will not upload

Check the file extension matches an accepted type (JPEG, PNG, WEBP). Some cameras save rare variants; re-saving the file once in a normal viewer usually fixes it. Very large files may also exceed browser memory — try a smaller copy.

⚠️ The download did not start

Browsers block automatic downloads when a pop-up blocker is aggressive or the tab lost focus. Click the download button again, allow downloads for this site, and check your Downloads folder for a (1) suffixed copy.

⚠️ The page feels slow with a huge image

A 50-megapixel photo decodes hundreds of megabytes in memory. Resize in two steps — halve the dimensions first, then fine-tune — and close other heavy tabs. Everything runs on your device, so available RAM matters.

Key terms explained

Threshold in one sentence
Convert to black and white using threshold. Works entirely client-side on JPEG, PNG, WEBP files — nothing is uploaded to a server.
Lossless compression
Reduces file size without discarding any pixel data — the decoded image is bit-for-bit identical to the original. PNG and WebP-lossless work this way.
Lossy compression
Shrinks files by permanently discarding detail the eye tolerates losing. JPG, WebP-lossy and AVIF trade a little fidelity for large savings.
Aspect ratio
The proportional relationship between width and height (e.g. 16:9). Keeping it constant prevents stretching and squashing.
Resolution
The count of pixels an image contains (width × height). More pixels mean more detail and larger files.
Alpha channel / transparency
Extra per-pixel data that marks areas as see-through. Supported by PNG and WebP; ignored by JPG.
EXIF metadata
Hidden data a camera embeds in each photo — device, settings, sometimes GPS. Useful for organizing, risky for privacy when sharing.

Click, drag & drop, or paste an image

Accepted: JPG, PNG, WebP, GIF

Quick Answers

What does Threshold do?

Convert to black and white using threshold

How do I use Threshold?

Upload your image, adjust the settings, and click process. Download the result.

Tool Details

Input Formats

JPG, PNG, WebP

Output Formats

JPG, PNG, WebP

Processing

In your browser — no uploads

Limitations

  • Maximum file size depends on browser memory
  • Processing speed depends on device capability
  • Some features may not work in older browsers

Blur Image

Apply blur effect to images. Useful for privacy, backgrounds and creative effects.

Sharpen Image

Enhance image details by applying sharpening. Make blurry images clearer.

Brightness Adjuster

Adjust image brightness. Make dark images lighter or bright images darker.

Contrast Adjuster

Adjust image contrast. Make colors more vivid or tones more subtle.

Related Guides

Image Formats Guide
Browse more filter tools →

Frequently Asked Questions

Is threshold free?

Yes, completely free with no limits on usage.

Are my images uploaded to a server?

No. All processing happens directly in your browser. Your images never leave your device.

What image formats are supported?

This tool supports JPEG, PNG, WEBP formats.

Can I use this on mobile?

Yes, the tool works on any device with a modern browser — Android, iPhone, and tablets.

Is threshold safe for private photos?

Yes. Because everything runs locally in your browser, your photos are never uploaded, stored, or seen by anyone else.

Do I need to create an account or install software?

No account, no installation, no watermark. Open the page, drop your image, and download the result.
🔒

Private

In your browser

💾

No Storage

Images stay on your device

🚫

Private

Your images never leave your device