Convert images to black and white online
Transform your photos into classic monochrome or high-contrast black and white. Drop a single picture or a whole folder — processed instantly in your browser.
- No upload
- Free, no sign-up
- Whole folders
- Works offline
Drop images or a folder here
JPG, PNG, WebP, AVIF or BMP · no file limit
Processed on your device. Nothing is uploaded.
How to convert photos to black and white
- 1
Add your photos
Drop single images, multiple photos or an entire folder. Subfolders are fully preserved.
- 2
Black & White filter is pre-selected
Adjust contrast and brightness in the settings if you prefer high-contrast Film Noir monochrome.
- 3
Compare before and after
Slide across your photos to preview the monochrome transformation in real time.
- 4
Download your pictures
Download individual files, an organized ZIP archive, or save directly back to your local folder.
Why convert photos to black and white in your browser?
Classic black and white photography strips away color distractions to emphasize light, texture, and emotion. With OptiFolder, you can convert dozens of photos or full albums to clean monochrome in seconds.
Because all processing uses your device’s GPU and multi-core processor, your personal photos are never uploaded to any remote server or stored in the cloud.
Achieving the perfect monochrome look
Use our neutral Black & White preset for balanced, timeless portraits and landscape shots. If you want a punchier, dramatic aesthetic reminiscent of vintage cinema, switch to Film Noir or increase the contrast slider.
You can also combine black and white conversion with resolution scaling and target file size limits (like 100 KB) in one automated pass.
Frequently asked questions
Does converting to black and white reduce image quality?
No. The conversion preserves the full resolution and crisp sharpness of your originals. You can download lossless PNGs or high-quality WebP/JPEG files.
Can I convert an entire folder of photos to black and white at once?
Yes! Drop your entire folder, and OptiFolder will convert every photo to monochrome while preserving your directory tree structure upon export.
Are my photos uploaded to a server?
Never. All conversions happen entirely on your computer or phone using modern browser technology.
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