Grayscale
Convert PDF text and images to grayscale.
How to Use Grayscale
- Upload your file: Drag and drop your file into the active processing area above, or click the box to browse your device files.
- Configure settings: Select your preferred options (such as target file size in KB, compression level, page order, or output format).
- Process locally: Click the primary action button. Your file is rendered and encoded in seconds directly inside your browser memory.
- Download output: Click Download to save the modified document back to your device. No watermarks are added.
Zero-Cloud Privacy Guarantee
Unlike legacy web utilities that upload your sensitive documents to remote servers, PDFtiny executes 100% of processing inside your local browser using WebAssembly. Your files never leave your computer, ensuring complete privacy, enterprise compliance, and offline availability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Processing Engine | Client-Side WebAssembly (WASM) & HTML5 File API |
| Server Transmission | 0 Bytes Uploaded (100% Local Browser Memory) |
| Device Compatibility | Chrome, Safari, Firefox, Edge, Android, iOS, Windows, Mac, Linux |
| Compliance | ISO 32000-2:2020, GDPR Article 25 (Privacy by Design) |
Frequently Asked Questions
Why convert a color PDF to black & white or grayscale?
Grayscale conversion saves expensive color printer ink/toner, produces cleaner black-and-white photocopies, and often reduces PDF file size by stripping unnecessary color channel metadata.
Will converting to grayscale make light text unreadable?
PDFtiny utilizes balanced luminosity conversion formulas (0.299 R + 0.587 G + 0.114 B) to ensure contrast remains readable across colored headlines, badges, and chart legends.
Are vector lines and font characters converted too?
Yes, both vector elements (lines, shapes, text glyphs) and raster photographic images are mapped into the DeviceGray color space.
Can I convert back to color later?
Grayscale mapping permanently discards color chrominance data in the output file, so always keep your original color PDF backed up.