Upload the PPTX
Choose the deck whose existing wording you want to brief.
Gixo Lumen · deterministic document conversion
Summarize a PowerPoint without inventing a single sentence.
Upload a PPTX and get a slide-by-slide extractive brief. The tool selects the title and opening native sentences from each slide; it does not call a model, paraphrase, or fill gaps with invented claims.
Editable slides, not screenshots
Free preview, no account required
Structure read from your source
Your wording kept
Extractive brief with source preview
Bring in
PowerPoint deck
Get back
An extractive Markdown brief and source preview
An ordinary PPTX with native slide text. Speaker notes are inspected but are not rewritten.
Review every slide in the browser for free, without an account. Sign in only when you want to download PPTX or PDF.
A converter, not a prompt box
Turn the structure you already have into a slide preview.
This is a safe deck brief, not a model-generated executive summary. If you want interpretation or restructuring, choose that deliberately in Lumen after reviewing the source.
The conversion step is deliberately structural. It extracts the source, identifies headings and blocks, and splits long sections into readable slides — it does not paraphrase your source or invent a narrative around it. Rewriting, restructuring and theming are separate, opt-in steps you take afterwards on the canvas.
Free preview: convert and inspect the complete deck in your browser without an account. Sign in is the download boundary for PPTX and PDF.
How it works
Three bounded steps from PowerPoint deck to slides.
Extract the structure
Titles and opening native sentences are selected slide by slide without an LLM.
Compare the brief
Review the extractive output alongside the detected slide content before using it elsewhere.
Source rules
What the converter reads from PowerPoint deck.
The summary is deterministic Markdown built from the deck's existing title and opening sentences. The full detected slide content remains visible for comparison.
Extractive only
The output is made from sentences already present in the deck.
Two sentences per slide
The brief selects at most the first two sentence-like text runs after the title.
Source stays visible
The browser preview keeps the detected slide text next to the brief so omissions are inspectable.
Output behavior
What stays faithful, and what does not.
Preserved or represented
- Slide titles
- Opening native sentences
- Slide count and text metrics
- A side-by-side source-content preview
Outside this batch
- AI paraphrase
- Invented conclusions or recommendations
- Claims that are not present in the deck
- A promise of semantic summarization
Supported formats & specifications
The contract we can state today.
PPTX input cap: 5 MiB. The Release fixture produced a 2-slide extractive brief with at most two source sentences per slide; no AI paraphrase or invented claims are added. A ~10 MB benchmark is outside the cap.
| Aspect | Current behavior |
|---|---|
| Input | PowerPoint deck |
| Result | A slide-by-slide extractive brief plus detected source text, titles, table counts, and layouts. |
| Free vs signed in | The brief and preview are free without an account. Sign in to download the PPTX or PDF, apply theming, or choose AI restructuring afterwards. |
| Measured limits | PPTX input cap: 5 MiB. The Release fixture produced a 2-slide extractive brief with at most two source sentences per slide; no AI paraphrase or invented claims are added. A ~10 MB benchmark is outside the cap. |
| Extraction | Structural, not generative: headings, blocks and tables are read from the source rather than rewritten. |
| Safety | Uploads are validated and bounded-parsed. URL conversion accepts public HTTP/HTTPS pages only. |
What conversion does, and what it leaves to you
Structure is extracted. Judgement stays yours.
Conversion reads the structure already in your source and lays it out as slides. The brief and preview are free without an account; sign in only for file download, theming, or optional AI restructuring. Nothing is silently reworded between the file you brought and the deck you present.
A note about extractive summaries: Because the words come from the deck, awkward phrasing and missing context remain visible rather than being silently polished.
Current public contract
PowerPoint deck to PowerPoint public contract
A short, explicit description of what this converter does and where the paid Lumen workflow begins.| Aspect | Current behavior | Why it matters |
|---|---|---|
| Input | PowerPoint deck | The named source front-end determines which structural signals are read. |
| Review | Every slide is editable on the canvas before export. | You can inspect and correct the output before anything leaves the workspace. |
| Free preview | Full editable deck preview without an account. | Slide count, source-page count, and extraction warnings are visible before sign-in. |
| Export | PPTX and PDF after sign-in, with editable text and native tables. | Slides are rebuilt as real objects rather than flattened page images. |
| Method | Structural extraction and slide assembly, not paraphrase. | The same source structure produces the same conversion behavior. |
Does the summarizer use AI?
No. It extracts existing slide titles and opening sentences deterministically.
Can it invent a conclusion from the deck?
No. The tool does not add claims, paraphrase, or infer a narrative that the source does not contain.
Can I see what was selected?
Yes. The extractive brief appears alongside the detected text preview for every slide.
Can I download the source deck?
Sign in for the PPTX or PDF download boundary; the free result is the extractive brief and visual inspection preview.
Questions people ask before converting
PowerPoint deck to PowerPoint, answered plainly.
Does the summarizer use AI?
No. It extracts existing slide titles and opening sentences deterministically.
Can it invent a conclusion from the deck?
No. The tool does not add claims, paraphrase, or infer a narrative that the source does not contain.
Can I see what was selected?
Yes. The extractive brief appears alongside the detected text preview for every slide.
Can I download the source deck?
Sign in for the PPTX or PDF download boundary; the free result is the extractive brief and visual inspection preview.
Ready to inspect the result?
Convert PowerPoint deck to PowerPoint and review the slides before you export.
Reviewing is the point: you can see whether the source structure made a useful deck, and fix it on the canvas, before anything is exported.
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