Optical Inversion & Edge Sharpen
Flips dark backgrounds to pure #FFFFFF paper while preserving color hues, sharpens crisp math formulas, and can mask recurring headers/logos.
Dark PDF to Light Converter & Print Studio
Made for
Transform dark-mode lecture slides, IDE screenshots, and study notes into crisp, paper-white handouts. Cut printer ink and toner consumption by up to 90% directly inside your browser.
psst… your notes never leave this device ✎
Drop your dark PDF or lecture slides here
or browse files from your device — you can also paste a screenshot with Ctrl / ⌘ + V
PDFPNGJPGWEBP / GIF
Rendering pages locally...
Nothing is uploaded — your browser is doing all the work.
90%less ink per page
12slides per sheet, max
0 uploadseverything stays on your device
100%free · no sign-up
1.
Drop it in
PDF decks, screenshots or photos of slides. Pages render on a canvas inside your browser tab.
2.
Flip & tune
Hue-safe inversion turns dark backgrounds into clean paper white. Highlight, crop, mask and annotate.
3.
Pack & print
Fit up to twelve slides per sheet, add note lines, then export a print-ready PDF or image ZIP.
See it live
Drag to watch the ink disappear
This is the real conversion engine running on a sample slide, right inside your browser. Slide the handle or switch looks.
—
Try it on your own file
— less inkestimated on this slide
Original DarkPrint-Ready Light
With logo, watermark & footer
New · Slide Eraser
Lift logos & stray text right off the slide
Circle a university crest, tap a watermark or box a footer line. It disappears and the background is rebuilt — on one slide or the whole deck.
- Logo — lifts stamps and crests off the page
- Text — erases letters only, keeps pictures
- Brush — rub out anything with a finger
- Colour — one tap removes a watermark everywhere
ROI & Toner Estimator
Printing & Ink Savings Calculator
600 pages
100 pages1,500 pages (Exam Month)3,000 pages
Slides packed per sheet
6-Month Semester Savings
$0.00
Monthly Savings
$0.00/mo
Annual Paper Saved
0 sheets
Ink / Toner Reduction
~88% Less Coverage
CO₂ Avoided
0 kg/yr
Trees Spared
0 /yr
Studio Tools
A whole print desk in one notebook
9-Color Annotator & Page Crop
Highlight definitions in nine inks, draw freehand diagrams, drag text notes, crop slide margins, pack up to nine slides per sheet.
100% Zero-Upload Privacy
Every pixel transformation, crop, mask, and PDF/ZIP compilation runs in browser memory; study notes never touch an external server.
new in this edition100+ upgrades
100% Local Privacy
The zero-upload guarantee
LuminaSheet Studio has no backend. Your PDFs and images are decoded, inverted, annotated and compiled entirely in this browser tab's memory. Close the tab and everything is gone — no accounts, no file uploads, no analytics on your documents.
No file uploadsNo sign-upWorks on a flaky connection once loaded
Good questions
Frequently asked
Are my files uploaded anywhere?
No. Files are read with the browser File API and processed on canvases in memory. There is no server component that could receive them.
Will colored diagrams turn into strange colors?
Smart Hue Preservation flips lightness only, so a blue curve stays blue and yellow highlights stay yellow. Turn it off for a classic photographic negative.
How big a PDF can it handle?
It depends on your device's memory. Decks of 100+ slides usually work on laptops; on phones, loading a few dozen pages at a time is safer.
Is the output text selectable?
No — pages are re-rendered as images so the inversion works on any content (screenshots, scans, formulas). The result is designed for printing.
Why does it feel slow on my phone?
Turn on Lite mode (the bolt icon, or the link in the footer). It removes blur and animation so more of your device's power goes to processing.
Is it free?
Yes. There are no paid tiers, watermarks or page limits.
Contact us
Say hello, report a bug, or request a feature
This site has no server, so the form simply prepares an email in your own mail app. Nothing is sent until you press send there.
Designed & developed by
Bedanga Sharma
feedback makes the next version better!