Context Builder — Assemble Optimal LLM Context Windows
Pick documents, pick a model, and we build the highest-signal context window that fits — deduplicated, ordered, and tagged.
Stop stuffing context. Build it.
Most teams build context windows by concatenating files until they’re close to the model’s limit. The result is bloated, redundant, and randomly ordered. Our context builder treats the context window as a budgeting problem: pack the most relevant, least redundant material first, in the order the model reads best, with clear section delimiters.
You select source documents (Markdown, text, URLs, transcripts), pick a target model and budget, and the tool produces a single Markdown payload — ready to paste or send via API — that maximizes the signal per token.
What it does
Token-aware packing for any major model
Deduplication of repeated paragraphs across sources
Optional ordering by relevance to a query
Section delimiters and source tags so the model can cite
Compression of low-signal sections via summarization (optional)
Reproducible — same inputs and settings produce the same output
The output is a clean Markdown document plus a metadata block listing every source and how many tokens it consumed.
How it works
Add sources: paste text, drop files, or fetch URLs
Pick a target model and a token budget
Optionally provide a query to rank relevance
We pack, deduplicate, and order the context
Copy the bundle or download as Markdown plus a manifest
Use cases
Prepare context for a long-document Q&A session
Build a coding-assistant context from selected files in a repo
Pre-pack a research briefing for a strategy LLM call
Assemble a customer-support context bundle from past tickets
Construct a structured prompt for a one-shot generation
Generate reproducible context bundles for evaluation suites
Frequently asked questions
How is relevance ranked?
Optional embedding similarity to your query. Without a query, sources are ordered as you provided them.
Does it summarize?
Optional. Low-priority sources can be auto-summarized to fit the budget when enabled.
Which models are supported?
GPT-4/5, Claude 3.5 / 4 / 4.5, Gemini 1.5 / 2, Llama 3, plus a generic profile.
Can I see what was dropped?
Yes. The manifest lists every source and whether it was included, summarized, or cut.
Is the output deterministic?
Yes. Same inputs and settings always produce the same Markdown bundle.
Your AI doesn't read PDFs directly. It first has to extract the text, decode the layout, ignore the metadata — before it can even start answering. A Markdown file removes all of those steps. Your AI reads it instantly. So you get faster responses, more accurate results, and zero information lost along the way.
Size-wise, it's 100 to 500 times lighter for the same content. A 15 MB PDF becomes a 30 KB .md file. So your AI knowledge base can hold hundreds of documents instead of a handful.
MDisBetter brings 19 free tools together for that — documents, videos, audio, web pages and prompts.
How does it work?
Drop a PDF, a video, an audio file or a URL. MDisBetter extracts the content and gives you a clean Markdown file. So you can send it to your AI, add it to your project files, or store it in your knowledge base — without losing anything.
Frequently Asked Questions
How do I convert a PDF to Markdown for free?
Upload your PDF to MDisBetter, click Convert, and get structured Markdown in seconds. No signup, no installation — it works directly in your browser. The free plan includes 50 credits per month.
Why is Markdown better than PDF for AI?
Markdown reduces token usage by up to 95% compared to PDF. AI models like ChatGPT and Claude process Markdown far more efficiently because it contains only content structure — no fonts, no layout data, no binary overhead.
What file types can MDisBetter convert?
MDisBetter converts PDF, Word (.docx), plain text, YouTube videos (transcript), audio files (MP3, WAV, M4A, OGG, FLAC, WEBM), and any web page URL to clean Markdown.
Is MDisBetter free?
Yes, free to start. The free plan includes 50 credits per month. All processing happens securely — your files are never stored.
Can I extract a YouTube transcript as Markdown?
Yes. Paste the YouTube video URL, click Convert, and get the full transcript structured as Markdown with headings and timestamps. Perfect for feeding video content to AI tools.
PDF → Markdown
Faithful and structured conversion of your documents
Text to MD, EPUB to MD, MD to PDF, MD Cleaner, Merger, Chunker, Token Counter, Context Builder
Free
—
Word to MD
0.5 credit
per page
Excel to MD
0.5 credit
per conversion
Single URL Scrape
0.5 credit
per call
Site Crawl
1 credit
per page
Translate
1 credit
per 10 000 chars (min 1, free re-translation on cache hit)
Prompt Optimizer
1 credit
per call
System Prompt Generator
1 credit
per call
Audio to MD
2 credits
per minute
Video to MD
2 credits
per minute
YouTube to MD
2 credits
per minute
Image OCR
4 credits
per image (0 on cache hit)
PDF to MD
4 credits
per page
PPTX to MD
4 credits
per slide
Questions
Yes! You get 50 credits every month to use any tool. Basic tools like MD Cleaner or Token Counter cost just 0.5 credit per use. When you run out, credits reset the next month or you can upgrade for more.
Wait for your monthly reset or upgrade to a higher plan. Credits renew on your billing date each month.
Yes, cancel anytime with one click. No questions asked. You keep access until the end of your billing period.
Pro gives you 30,000 credits for $29 — that's 30x more credits than Starter for just 3x the price. Every credit costs less, so you get far more value per dollar.