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Operations · Intermediate

# Convert technical PDFs to dark mode with preserved diagrams

Transform document color palettes for low-light reading while keeping embedded charts and figures legible.

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Opens BotBento. Paste the prompt into a bot; nothing is preconfigured.

- When you askReceive document file or link
- ThenInvert text colors and retain figures
- ResultDeliver dark-themed document

Process PDF documents to produce high-contrast, dark-themed copies suitable for low-light reading. The workflow inspects page luminance to avoid re-inverting dark slides, applies optical character recognition to scanned pages and charts, and isolates embedded figures so visual artifacts remain unchanged.

## Prompt to start with

BotBentoRecommended

```
When a user submits a PDF, inspect each page for background luminance before adjusting colors. Apply inverted tone styling to text layers while isolating graphic elements so figures and diagrams remain untouched. Run text recognition on scanned sections to ensure text remains selectable. Always ask for confirmation before saving the converted file to external storage or sending it via messaging.
```

Copy

## Tools it uses

PDF filesTerminalChat

## Works with

BotBento

## Tags

- pdf
- document-processing
- reading
- ocr

## Source

[Show HN: Veil – Dark mode PDFs without destroying images, runs in the browser](https://news.ycombinator.com/item?id=47529306)
Hacker News · checked 2026-10-16

Summarized in our own words. Any results described there are the authors’ own, not measured by BotBento.

By BotBento Editorial · Added 2026-10-16 · Updated 2026-10-16 · [Suggest a correction](/contact/)

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