Convert to Black & White Free
Convert colour photos to black and white (grayscale) online for free. Choose from luminosity, average, or channel-based conversion modes. Adjust brightness and contrast for the perfect B&W result. PNG, JPG, WebP, and GIF supported. Batch up to 20 images. No signup, no watermark.
Drop your images here
PNG · JPG · WebP · GIF · up to 20 images
0 image(s) selected
Conversion Settings
No account required · Files deleted in 24h
Converting to black & white…
Processing
0%
Pro — 200 images/batch, sepia tone, duotone, infrared simulation, API
API access · Priority queue · Team workspace
How It Works
Upload Images
Upload up to 20 colour images at once. PNG, JPG, WebP, and GIF formats are all supported. Animated GIFs are processed frame by frame — every frame is converted to grayscale, preserving animation timing and loop settings. Upload multiple images for batch B&W conversion of a photo set.
Choose Conversion Mode
Select the grayscale algorithm: Luminosity (perceptually accurate — weights RGB by how sensitive human vision is to each: 21% R, 72% G, 7% B), Average (equal RGB weighting, produces flatter results), or individual channel extraction (Red, Green, or Blue channel only — useful for black-and-white photography creative effects). Adjust brightness and contrast to fine-tune the result.
Download B&W Image
Download your grayscale images. Multiple images are packaged in a ZIP. B&W output can be PNG (true grayscale, lossless), JPG (smaller file, some compression), or the same format as the input. The output resolution is unchanged — a 4000×3000 colour photo becomes a 4000×3000 grayscale image at full resolution.
B&W Conversion Features
Perceptual Luminosity Mode
The Luminosity mode uses the ITU-R BT.601 formula: L = 0.299R + 0.587G + 0.114B. This weights green most heavily because human vision is most sensitive to green wavelengths, red less so, and blue the least. The result is a grayscale image that matches how the scene would appear to the human eye in black and white — reproducing bright yellows as light grey, deep blues as dark grey, and skin tones with natural tonal gradations.
Brightness & Contrast Control
Fine-tune your B&W output with brightness (−100 to +100) and contrast (−100 to +100) adjustments applied after the grayscale conversion. Increasing contrast creates the dramatic high-contrast look associated with classic B&W photography. Reducing contrast creates a soft, low-key look. Increasing brightness lifts shadows; decreasing it creates a more moody, dark image.
Channel-Based B&W
Extract just the red, green, or blue channel for creative B&W effects borrowed from film photography. A red channel extraction lightens skin tones and darkens skies (like a red filter in film B&W). A blue channel extraction darkens skin and brightens skies — the opposite effect. A green channel is similar to luminosity, with natural skin tones. These channel modes are used by photographers for artistic control over tonal relationships.
Batch — 20 Images
Convert up to 20 colour images to B&W in one batch using the same settings. Essential for photographers converting an entire photo shoot to grayscale, print designers creating B&W proofs of a colour image library, or content creators applying a consistent monochrome aesthetic across a series. All output images are packaged in a ZIP for easy download.
Full Resolution Output
The conversion preserves the full original image resolution — no resizing or downsampling occurs. A 20-megapixel camera RAW converted to B&W (via our TIFF or JPG conversion first) outputs a 20-megapixel grayscale image. This makes the tool suitable for print-quality B&W photo conversion, not just web preview generation.
Private & No Account Needed
All uploads use TLS 1.3. Files deleted within 24 hours. No watermarks. No account required.
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| Images per batch | 20 | 200 |
| Conversion modes | 5 | 5 + Sepia + Duotone |
| Sepia tone | — | |
| Duotone (2 custom colours) | — | |
| API access | — | |
| Watermark | None | None |
Frequently Asked Questions
Average grayscale simply adds R + G + B and divides by 3 — each channel contributes equally. Luminosity grayscale (ITU-R BT.601) weights the channels by human visual sensitivity: 29.9% red, 58.7% green, 11.4% blue. Since human eyes are most sensitive to green, luminosity mode produces results that look more natural — objects that appear bright to the eye look bright in the grayscale image. Average mode often makes colours like pure blue appear brighter than they do visually. For most uses, Luminosity gives the best results.
This tool converts raster images (JPG, PNG, etc.) to B&W. For PDF to black and white, you would first need to convert the PDF pages to images using a PDF to image converter, then convert those images to B&W here, and optionally re-assemble them into a PDF using our Image to PDF tool. Alternatively, most PDF editors (Adobe Acrobat, Preview on macOS) have a print-to-PDF option with a B&W/grayscale colour profile that handles the entire conversion in one step.
In traditional B&W film photography, a red filter placed in front of the lens dramatically darkens blue skies while leaving red and orange tones bright — making clouds stand out dramatically against dark sky. The Red channel extraction in our B&W converter simulates this effect digitally: blue skies appear dark grey or near-black, while sunsets, autumn foliage, and warm-toned subjects appear very bright. This creates the classic dramatic landscape B&W look associated with Ansel Adams-style photography.
For JPEG: B&W JPEGs are often somewhat smaller than colour JPEGs of the same image because the grayscale data has less variance to encode. For PNG: a true 8-bit grayscale PNG (single channel) is about 3× smaller than a 24-bit RGB PNG because it stores one value per pixel instead of three. Our converter outputs grayscale PNGs in 8-bit mode when the source has no transparency, or 16-bit grayscale + alpha for transparent PNGs.
Sepia tone and Duotone (two custom colours mapped to shadows and highlights) are available in the Pro tier. Sepia applies a warm brownish tint over the grayscale image, replicating the look of antique photographs. Duotone lets you choose any two colours — for example, deep navy for shadows and warm cream for highlights creates a stylish bi-colour film effect used in editorial photography and brand design.
Yes. TLS 1.3 encrypted uploads. Files deleted within 24 hours. No watermarks. No account required.