# PDF Slim — PDF Compression for AI (remote · api.pdfslim.app)

Compress PDFs to exact target sizes (82-93% smaller). Tools: compress_pdf, optimize_pdf, inspect_pdf

- Trust score: 67/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-20

## Components

- remote · `api.pdfslim.app`: 67/100 (this document), [markdown](https://verifymcp.io/servers/zhaoyaqi18-pdfslim/api.md), [page](https://verifymcp.io/servers/zhaoyaqi18-pdfslim/api)

## Channel facts

- Endpoint: `https://api.pdfslim.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-20.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 80/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 411 tokens (~137/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 37/100
  - Stability observed for 11 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http zhaoyaqi18-pdfslim https://api.pdfslim.app/mcp
```

### Codex

```toml
[mcp_servers.zhaoyaqi18-pdfslim]
url = "https://api.pdfslim.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "zhaoyaqi18-pdfslim": {
      "type": "remote",
      "url": "https://api.pdfslim.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add zhaoyaqi18-pdfslim --url https://api.pdfslim.app/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  zhaoyaqi18-pdfslim:
    url: "https://api.pdfslim.app/mcp"
```

### Other

```json
{
  "mcpServers": {
    "zhaoyaqi18-pdfslim": {
      "type": "http",
      "url": "https://api.pdfslim.app/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-19 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-17 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-15 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-13 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-11 (score 63, +2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-08-10 (score 61, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-09 (score 61)

First indexed and scored.

## MCP tools (3)

### `compress_pdf` (~227 tokens)

Compress a PDF file to reduce its size. Renders pages and re-encodes as JPEG, iterating quality/resolution to hit a target size. Use this when a user wants to shrink a PDF (e.g. to 500KB, 1MB, or "smaller"). Free anonymous tier: 20 calls/day per IP, files up to 10MB. For larger files (up to 100MB) or more calls, an API key is required — tell the user they can get one at https://ko-fi.com/yugutou/shop, or point them to the free website https://pdfslim.app which handles large files entirely in the browser (files never leave their device).

Input parameters:

- `file_base64` (string, required): The PDF file contents, base64-encoded.
- `quality` (integer): Optional JPEG quality 25-95 (default 82). Lower = smaller file.
- `target_size` (integer): Optional target output size in bytes (e.g. 500000 for 500KB). If omitted, compresses as much as reasonable.

### `optimize_pdf` (~108 tokens)

Lossless PDF optimization: garbage collection, stream re-compression. No quality loss. Good for PDFs with redundant data; effect is small on already-optimized files. Free anonymous tier: 20 calls/day per IP, files up to 10MB. Larger files / more calls need an API key (https://ko-fi.com/yugutou/shop) or the free website https://pdfslim.app.

Input parameters:

- `file_base64` (string, required): The PDF file contents, base64-encoded.

### `inspect_pdf` (~76 tokens)

Inspect a PDF: page count, file size, password protection. Use before deciding how to process a PDF. Free anonymous tier: 20 calls/day per IP. More calls need an API key (https://ko-fi.com/yugutou/shop).

Input parameters:

- `file_base64` (string, required): The PDF file contents, base64-encoded.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/zhaoyaqi18-pdfslim/api#diagnostics

## Score history

- 2026-08-20: 67
- 2026-08-19: 67
- 2026-08-18: 66
- 2026-08-17: 66
- 2026-08-16: 65
- 2026-08-15: 65
- 2026-08-14: 64
- 2026-08-13: 64
- 2026-08-12: 63
- 2026-08-11: 63
- 2026-08-10: 61
- 2026-08-09: 61

## Links

- Remote endpoint: https://api.pdfslim.app/mcp
- Website: https://pdfslim.app/api
- Changelog RSS feed: https://verifymcp.io/servers/zhaoyaqi18-pdfslim/api.xml
- Changelog JSON feed: https://verifymcp.io/servers/zhaoyaqi18-pdfslim/api.json
- HTML version of this page: https://verifymcp.io/servers/zhaoyaqi18-pdfslim/api