Reading documents at night
Create white text on a black background to reduce the bright background area on the screen.
PDF tool
Preparing…
Please wait a moment.
PDF tool
Preparing…
Please wait a moment.
Invert colors or apply high contrast mode. Upload one file up to 256 MB. No registration required.
Technical content edited by Tools.4PDF.Net • Updated September 8, 2026Choose one file · up to 256 MB
Files are protected and deleted automaticallyGuide
Three steps from the source document to the result you need.
Select the right task for your document.
Drop files or select them directly from your device.
Track progress and download your file when it is ready.
No account, no installation and no unnecessary steps.
Only this session can access your files.
Input files and results expire after one hour.
Learn about this tool
PDF color inversion creates a document with a different color scheme for reading in dark environments or increasing contrast. Besides the full color inversion mode, you can choose white text on a black background, black text on a white background, yellow text on a black background, or blue text on a black background. One mode will be applied to the entire file. You can try each display option to find the easiest to read or create a reference version with clear contrast.
Color alteration directly affects the PDF content, so images, logos, charts, and color codes may differ significantly from the original. High contrast mode does not recognize which colors carry operational meaning. Therefore, charts using color to differentiate data may become difficult to read. Review pages with images and legends before using the result. The processed file has new colors and does not function as the reader's temporary dark mode.
Create white text on a black background to reduce the bright background area on the screen.
Choose black text on a white background when the source has a colored background that makes the text hard to read.
Use yellow or blue text on a black background for documents that are mainly text.
Practical tips
Each job uses a separate anonymous session. Learn how we handle data in our Privacy and Security.
Frequently asked questions
Inverting all colors changes colors according to their opposite relationships, so both images and color components also change. White text on a black background is oriented toward a specific contrast color scheme for the content. For PDFs that only contain text, the two results may look similar; for images and charts, the differences are usually noticeable, so it is necessary to check.
No mode guarantees preserving the original color meaning of charts. Color inversion and contrast color schemes can make legends difficult to reference. If colors indicate status or data groups, it is better to read the original version or only use the color-changed version for text pages. Always check each important chart before sharing.
No. The result is a PDF that has applied the selected color mode, so the printer will receive those colors. A black background can consume a lot of ink and is not suitable for printing. If you only want a dark interface for reading, the dark mode of the PDF viewer app may be more reasonable because it does not change the file.
Access expires after one hour and cleanup runs every five minutes. Download any results you need before they expire.