PDF ↔ Black and White
BW conversion for OCR preprocessing
No upload · 100% in your browserThe PDF ↔ black-and-white tool simplifies color documents to binary black and white, or rebuilds BW images into a PDF. Tune the threshold for OCR preprocessing or print savings.
How to use
- Choose a mode (PDF→BW or BW→PDF).
- Upload the file.
- Adjust the threshold.
- Run conversion and download the result.
When it helps
- Cleaning BW contrast for OCR preprocessing
- Going black-and-white to cut print cost
- Simplifying document noise
Good to know
For low-contrast originals, lower the threshold to reduce broken characters. Binarization removes color, so it does not suit color-critical material.
Frequently asked questions
Does it work both ways?
Yes — PDF→BW images and BW images→PDF are both supported.
What is the threshold?
It splits black/white by darkness. Lower it if characters break up.
Is color removed?
Binary black-and-white removes color information.
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