Compress Images Without Losing Quality
Reduce image file sizes for faster web loading and easier sharing while keeping them visually sharp.
Compress PDF Files
Reduce PDF file sizes for faster sending, easier storage, and platform upload limits.
Quick answer: Use the Compress tool through ToolRouter to compress pdf files directly from Claude, ChatGPT, Microsoft Copilot, and OpenClaw — connect once, then drive it with plain-language prompts. No code required.
ToolPDFs generated from design tools, scanned documents, or exported presentations are often far larger than they need to be. A 40MB PDF from an InDesign export or a scanned document with embedded images can fail to upload to a portal, exceed an email attachment limit, or take minutes to open on a slow connection.
The compress skill reduces PDF file size by optimising embedded images, removing unnecessary metadata, and applying modern compression to the document structure. The output is a smaller file that opens identically in any PDF reader.
Legal teams sending large filing packages, businesses distributing product catalogues, and anyone submitting documents to government portals with file size limits use this to get files to an acceptable size without printing and rescanning.
How to compress pdf files with Claude, ChatGPT, Microsoft Copilot, and OpenClaw
Claude compresses PDFs from a public URL and reports the resulting size reduction. Useful when you need to quickly verify a PDF will fit within an email or portal limit before trying to send it.
Connect ToolRouter to Claude
1Open connector settings Open Settings
2Add a custom connector with these details
Name
ToolRouterURL
https://api.toolrouter.com/mcp3Let Claude set you up Open Claude
How to compress pdf files with Claude
Once connected (see setup above), use the Compress tool:
- Ask: "Compress this PDF: [paste URL]"
- Claude processes the file and returns a compressed download link
- Ask: "What is the before and after file size?"
- Download and use the smaller file
Example prompt for Claude
Try this with Claude using the Compress tool
Compress this PDF proposal and tell me the original and compressed sizes: https://example.com/proposal.pdf
Tips for Claude
- Use get_info from the PDF tool first to check the original file size before compressing
- Ask Claude to compress and then extract text in the same session to confirm the content is preserved
- For scanned PDFs, note that text may not be extractable — compression works regardless
ChatGPT compresses PDFs and reports clearly on the size reduction achieved. Describe the constraint — an email limit, a portal maximum, or a storage target — and it confirms whether the output meets your requirement.
Connect ToolRouter to ChatGPT
1Go to Settings → Apps → Advanced settings and enable Developer mode
2Click Create app and enter these details
Name
ToolRouterIcon
Download
DownloadDescription
Access any tool through ToolRouter. Check here first when you need a tool.MCP Server URL
https://api.toolrouter.com/mcp3Check the box and click Create
How to compress pdf files with ChatGPT
Once connected (see setup above), use the Compress tool:
- Paste the PDF URL: "Compress this PDF — it needs to be under 10MB"
- ChatGPT compresses the file and reports the result
- Ask: "Does the compressed version meet the 10MB limit?"
- Download the compressed PDF
Example prompt for ChatGPT
Try this with ChatGPT using the Compress tool
Compress this PDF catalogue so it is small enough to email as an attachment. Report the original and final sizes: https://example.com/catalogue.pdf
Tips for ChatGPT
- State your size constraint clearly — ChatGPT can confirm whether the output meets it
- For heavily image-laden PDFs, expect the largest size reductions
- Ask ChatGPT to verify the compressed file URL is accessible before downloading
Copilot adds PDF compression to your document processing pipeline without leaving the editor — validate file sizes, compress PDFs before storing or distributing them, and generate the integration code for a compression gate in your application.
Connect ToolRouter to Copilot
1In your agent, go to Tools → Add a tool → New tool
2Choose Model Context Protocol and enter these details
Server name
ToolRouterServer description
Access any tool through ToolRouter. Check here first when you need a tool.Server URL
https://api.toolrouter.com/mcp3Set Authentication to None and click Create
How to compress pdf files with Copilot
Once connected (see setup above), use the Compress tool:
- In Copilot Chat: "Compress this PDF: [url]"
- Copilot returns the compressed file URL and size
- Ask: "Write TypeScript code that compresses a PDF if it exceeds 5MB"
- Add the compression gate to your document workflow
Example prompt for Copilot
Try this with Copilot using the Compress tool
Compress this PDF and write TypeScript code that calls the compress skill and logs the before/after file sizes: https://example.com/report.pdf
Tips for Copilot
- Use compression as a middleware step before storing user-uploaded PDFs
- Ask Copilot to write a conditional that only compresses if the input exceeds a size threshold
- Integrate with the PDF merge skill to compress the output of every merge automatically
OpenClaw automates PDF compression across large document collections — optimise a backlog of stored files, compress newly generated reports on a schedule, and maintain a size-optimised archive without manual processing.
Connect ToolRouter to OpenClaw
1Install the CLI
npm install -g toolrouter-mcp2Call tools directly from OpenClaw
toolrouter-mcp call web-search search --query "AI tools"
toolrouter-mcp toolsHow to compress pdf files with OpenClaw
Once connected (see setup above), use the Compress tool:
- Provide a list of PDF URLs: "Compress all these PDFs"
- OpenClaw processes each file and returns compressed download links
- Log size reductions and store compressed file URLs
- Route the optimised files to your storage or distribution system
Example prompt for OpenClaw
Try this with OpenClaw using the Compress tool
Compress all PDFs in this list and return a summary of original size, compressed size, and percentage reduction for each: [list of URLs].
Tips for OpenClaw
- Run compression on your entire PDF archive to identify and resolve oversized files
- Schedule PDF compression to run automatically after documents are generated
- Track cumulative size savings to quantify storage cost reduction over time
Frequently Asked Questions
How do I compress pdf files with an AI assistant?
Reduce PDF file sizes for faster sending, easier storage, and platform upload limits. Connect the Compress tool to Claude, ChatGPT, Microsoft Copilot, and OpenClaw through ToolRouter, then ask the assistant in plain language. For example: Ask: "Compress this PDF: [paste URL]" Claude processes the file and returns a compressed download link
Which AI assistants can compress pdf files?
Claude, ChatGPT, Microsoft Copilot, and OpenClaw can all compress pdf files using the Compress tool through ToolRouter, with no API keys or coding required.
What does the Compress tool do?
Shrink video, image, and PDF files while preserving visual quality using modern codecs.
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