Convert PDF to Grayscale
Remove all colour from a PDF. Each page is rendered and saved as grayscale. Great for printing.
How to Convert a PDF to Grayscale — Save Ink, Reduce Size, Print Ready
Converting a PDF to black and white strips every page of its colour data while keeping text sharp and graphics readable. LovelyPDF uses PDF.js to render each page at high resolution, applies a luminance-weighted grayscale formula directly on the canvas, then repackages the result into a new PDF using pdf-lib — entirely inside your browser. Nothing is uploaded to any server.
The most common reason people need grayscale in India is printing cost. Colour laser toner cartridges cost 3–5× more than black ink. A CA preparing 40-page GST working papers, a law firm printing client agreements, or a student submitting a project report — all spend far less when they print monochrome. Converting to grayscale before printing also prevents the "colour cartridge empty" block that stops black-and-white jobs on many printers. Beyond printing, government exam admit cards and hall tickets downloaded from NTA, UPSC, and university portals are often colour PDFs that print cleaner and load faster once converted.
How to Use the Grayscale PDF Tool
- Click the upload area or drag your PDF onto it — any size is accepted
- Select the DPI setting: use 150 DPI for normal printing, 100 DPI for smaller file size, 200 DPI for sharp fine text
- Click Convert to Grayscale and wait for the progress bar to finish
- Download your black-and-white PDF — the original file is untouched
When Grayscale Reduces File Size Significantly
Colour PDFs — especially brochures, magazine layouts, and photo-heavy reports — typically shrink by 30–60% when converted to grayscale at 150 DPI. This matters when submitting documents to portals with file size caps. The EPFO and several state government tender portals cap uploads at 500KB or 1MB. If your document is a colour-heavy annual report or project proposal, converting to grayscale first and then running it through Compress PDF is the most effective two-step to hit those limits without losing readability.
Frequently Asked Questions
Will text stay sharp and readable after grayscale conversion?
Yes. LovelyPDF renders each page at high DPI before converting — text, tables, and fine lines remain crisp. Use 200 DPI if your document has very small print or footnotes.
Can I restore colour after converting to grayscale?
No — colour information is permanently discarded during conversion. Always save a copy of your original colour PDF before using this tool.
My admit card has a photo — will it look okay in grayscale?
Yes. Passport-style photos convert well to grayscale. Use 150 DPI or 200 DPI for the clearest result. The face will be clearly visible and the document will print with less ink.
Does this work on scanned PDFs (images inside PDF)?
Yes. The tool renders every page — whether it contains real text or a scanned image — and applies grayscale to the rendered output. Scanned documents convert just as well as native PDFs.
Related tools: Compress PDF · PDF to Image · Edit & Redact PDF