Context7
by upstash
Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.
Computer or cloud★ 64,224MITUpdated 3 days ago
Install
Pdfstudio
Overview
Description from the maker (original English)
Read, search, edit, and truly redact PDFs locally — 10 agent tools over stdio.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs on your computer
- Transport: stdio
- Category: Search & AI memory
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- The registry lists no key to fill in.
You need
- npmNode.js installed (for the npx command)
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json
{
"mcpServers": {
"pdfstudio": {
"command": "npx",
"args": [
"-y",
"pdfstudio-mcp"
]
}
}
}Run this in your terminal
claude mcp add pdfstudio -- npx -y pdfstudio-mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"pdfstudio": {
"command": "npx",
"args": [
"-y",
"pdfstudio-mcp"
]
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"pdfstudio": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"pdfstudio-mcp"
]
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Kayforkind, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- – Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Search & AI memoryi
- More stars than 0% of the other 7236 servers in this category
- Published to the registry more recently than 87% of the other 7236 servers in this category
- Basic checks equal to or better than 100% of the other 7236 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Pdfstudio safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.2) reached the registry 5 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.
What can I use instead?
In the same category: Context7, Codebase Memory, Exa
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Codebase Memory
by DeusData
Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.
Runs on your computer★ 48,148MITUpdated 20 days ago
Install
Exa
by exa-labs
Connect AI agents to Exa for web search, content fetching, and multi-step research.
Runs in the cloud★ 5,213MITUpdated 44 days ago
Install
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
PDF Studio
A PDF editor with no backend. It rewrites the file's content stream, in your browser.
▶ Try it live — *no install, no upload, no account*
Use the engine directly. The MCP server installs from npm; the CLI builds from the repo.
npx pdfstudio-mcp --root ./docs --read-only # MCP: 10 PDF tools over stdio, no API keynpx pdfstudio info contract.pdf # CLI — from a clone, after npm run build:packages
MIT · TypeScript · zero server · the whole pipeline auditable in this repo.
🎬 See it in action (31 sec) — edit text in place, redact for real, add sticky notes, highlight, compare two PDFs, and print. Recorded from the live app; nothing leaves the browser.
*Real recording: the tagline above is retyped live — the original text operators are rewritten in the file, not overlaid.*
Find this useful? A star at the top of the page helps others find it.
Quick start
In your browser, nothing to install: navigatorslab.com/pdf-studio
Self host with Docker, one command:
docker run -p 8080:80 ghcr.io/kayforkind/navigatorslab-pdf-studio:latest→ http://localhost:8080
CLI, from source (three commands):
git clone https://github.com/Kayforkind/NavigatorsLab-PDF-Studio && cd NavigatorsLab-PDF-Studionpm install && npm run build:packages npx pdfstudio info contract.pdf
The problem
Most "free" PDF editors work the same way: upload your contract or your ID to somebody's server, edit three pages, then get hit with a paywall, a watermark, a page cap, or a sign-up screen the moment you press Save. (The honest exceptions are self-hosted tools — but those make *you* run the infrastructure.) Desktop editors that genuinely modify existing text cost a subscription.
The fix
PDF Studio runs 100% in your browser. Your files are opened, edited, and saved on your own machine — there is no server to upload to. And unlike most free editors, it doesn't fake the editing: the Edit tool rewrites the page's content stream itself. The original text is deleted from the file and your replacement is written in as real vector text. Not an overlay. Not a text box on top. The old bytes are gone.
Try it in 30 seconds: open the live app, drop in any PDF, press E, click any line of existing text, retype it.
What it does
| ✏️ True text editing | Click any line — or any table cell — and retype it. Exports as real vector text, searchable and print-crisp. |
| 📝 Forms | Fill real AcroForms (text, checkboxes, radios, dropdowns), then flatten them so nobody can change your answers. |
| 🖋️ Sign & annotate | Signature pad, highlight, pen, arrows, shapes, sticky notes, image stamps — all real vector content. |
| 🖤 Redaction | True redaction — covered text is deleted from the file at export, not painted over. (Whiteout covers are visual-only; use redaction for sensitive data.) |
| 🔠 OCR | Scanned pages become editable text via on-device Tesseract (EN/ES/FR/DE). No upload, ever. |
| 🤖 On-device AI | Ask questions about your document; a real LLM runs in your browser via WebAssembly. Your data never leaves. |
| ⚖️ Revision diff | Drop in two versions, get a line-by-line diff. Did the payment terms change? Now you know. |
| 📄 Pages | Reorder, rotate, merge, split, duplicate, delete. Stamp page numbers, watermarks, headers & footers at export. |
| 📱 Anywhere | PWA — installs to your phone or desktop, works offline, autosaves and resumes your session. |
Screenshots — every claim above, captured from the running app
The full editor — free forever, private by design
Edit hints — every line of the original text is a clickable target
Annotate — underline tool with color and opacity controls
True redaction — covered text is deleted from the file, not painted over
Signature pad — draw with mouse, trackpad, or touch
Signature — stamped onto the page
Forms — values written into the real AcroForm fields
Compare — line-by-line diff of two versions
Export — page ranges, split, stamps, document properties
On-device AI — ask questions about your document, nothing uploaded
Mobile — bottom toolbar, full-width pages
How it works
Everything happens in your browser — your file is opened, edited, and saved on your own machine. The pipeline:
- Open — the PDF loads into browser memory. Nothing is uploaded.
- Edit — the Edit tool rewrites the page's content stream: the original text is deleted from the file and your replacement is written in as real vector text.
- Fill & sign — values go into the real AcroForm fields; signatures are drawn on the page. Flatten at export to lock them in.
- OCR — scanned pages get a text layer from on-device Tesseract, making them searchable, editable, and redactable.
- Redact — you draw boxes over what must disappear. In the editor these are marked for redaction (hatched): a promise, not a removal. Nothing is deleted yet.
- Export — the file is rebuilt from scratch. This is where redaction destroys content: fully covered text is deleted from the content streams (recursively through nested form objects); anything that can't be proven removable (partially covered text, images, exotic fonts) forces the page to be rendered to pixels with the boxes burned in and the original content discarded; form values, annotations, accessibility-tree text, metadata, XMP, attachments, JavaScript, and thumbnails under the boxes are scrubbed. Then the finished file is scanned for every covered string across multiple encodings — if anything redacted is still recoverable, no file is delivered; export fails loudly instead of handing you a file that leaks.
After export the app shows a verification report (regions redacted, strings checked, recoverable: zero). Whiteout, by contrast, is visual-only — it covers content without removing it. Use redaction for sensitive data.
Full detail: How it works — docs
How it compares
PDF Studio is the zero-setup option that keeps a full editor and never uploads your files.
| PDF Studio | Adobe Acrobat Pro | Stirling-PDF | Free web editors¹ | |
|---|---|---|---|---|
| Price | Free, MIT | ~US$19.99/mo (annual, billed monthly)² | Open core, free to self-host | Free tier, caps and ads |
| Where your document goes | Nowhere — it never leaves the browser | Adobe's servers | Your own server | Their servers |
| True in-place text editing | Yes | Yes | Alpha | No — annotate/overlay |
| Redaction | Bytes deleted, then verified before export | Yes (Pro) | Yes | Varies by product — verify it |
| CLI + MCP for agents | Yes — same engine, 100% local | No | No | No |
| Zero setup | Yes | No | No (Docker) | Yes |
| Works offline | Yes (PWA) | Desktop only | Your server | No |
| Open source | MIT | No | Open core | No |
¹ Smallpdf, iLovePDF, PDF24 and similar. They differ from each other; the row reflects the category, not one product. ² Adobe's published plan, checked 2026-10-08 — prices and plans change.
Full, sourced breakdown: COMPARISONS.md · web version.
The developer difference: redaction here is not a promise, it's a gate. The exporter scans its own output for every covered string in UTF-8, UTF-16BE/LE and hex, through both the delivered bytes and a decompressed re-serialization. If anything is recoverable, no file is produced.
Honest caveats
What PDF Studio does not do yet:
- Text editing needs a real text layer. Scanned pages go through the on device OCR first.
- Replacement text uses Helvetica metrics, so on exotic embedded fonts the match is near identical, not glyph perfect.
- The on device AI runs small models (0.5B to 1B). It summarizes your document and answers questions about it well. It is not a frontier model.
- There is no real time collaboration and no cloud sync. Autosave lives in the browser you used.
- Signatures are drawn signatures placed on the page, not certified digital signatures.
Privacy — absolute, by architecture
| Question | Answer |
|---|---|
| Where do my files go? | Nowhere. There is no upload endpoint. Open devtools while you edit: your document bytes never leave the machine. |
| Is any of my data collected? | No. No accounts, no analytics on your documents. Sessions autosave locally in your browser. |
| What *does* download? | The app itself, plus optional public AI/OCR model weights (cached after first fetch). Your documents never transit the network. |
| Can I air-gap it? | Mostly. The app and OCR engine are bundled and work offline. Only the optional AI assistant downloads model weights (from Hugging Face, on first use). Skip the AI assistant on an offline network; the model source cannot be changed to an internal mirror yet. |
Security
Security assessment — 2026-09-28 — overall grade A−. Each claim was checked against the source code. Full assessment: SECURITY_ASSESSMENT.md · agentic (CLI/MCP) addendum · reporting policy.
Residual risks (stated plainly): autosave is plaintext on your disk, so wipe after use on a shared machine; AI model weights come from HuggingFace over TLS without hash verification.
Only the beginning is shown; read the rest in the repo