PDF Too Large for AI? Compress It for ChatGPT, Gemini & Claude
AI tools reject PDFs that exceed their upload limits. Compress yours here in seconds — no account needed, nothing uploaded to a server.
🔒 Files never leave your device⚡ Instant processing in browser💸 100% free — no signup
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Drop your PDF here to fix upload errors
or click to select file — PDF only
Target size (optional)
or leave blank to compress as much as possible
⚡ AI File Size Limits (Quick Fix)
•ChatGPT allows PDF uploads up to 512MB per file, with a 2 million token limit for text-based files.
👉 Fix: Compress your file below the required limit using the tool above.
About this tool
ChatGPT allows up to 512MB, Gemini up to 100MB, and Claude up to 30MB per file. Image-heavy or scanned PDFs are the most common cause of upload failures and context overflow errors. Compressing reduces file size and token usage without affecting the text the AI reads.
How to use this tool
Select or drag and drop your file into the tool above.
Adjust the settings or target size as needed for your specific requirement.
Wait a moment while your file is processed directly in your browser.
Download the final file safely to your device.
💡 Good to know
→ChatGPT allows PDF uploads up to 512MB per file, with a 2 million token limit for text-based files.OpenAI Help ↗
→Scanned PDFs (image-based) consume far more tokens than text-based PDFs of the same page count.
→Compressing a scanned PDF reduces image resolution, which lowers file size and speeds up AI processing without affecting the readable text.
→Splitting a large PDF into topic-specific sections improves AI retrieval accuracy — the model finds relevant content faster.
Why is my PDF failing to upload to ChatGPT, Gemini, or Claude?+
Each AI tool has a different size limit: ChatGPT allows 512MB, Gemini 100MB, and Claude 30MB. Scanned or image-heavy PDFs are the most common cause of failures — compress yours to reduce file size before uploading.Source: OpenAI Help ↗
What are the PDF upload limits for major AI tools?+
ChatGPT: 512MB. Gemini web app: 100MB. Claude.ai: 30MB per file. Vertex AI direct upload: 7MB. Azure Document Intelligence free tier: 4MB.Source: OpenAI Help ↗
Does compressing a PDF affect what the AI can read?+
No. AI tools read the text layer of a PDF, not the images. Compressing image quality reduces file size without affecting the text the AI processes.Source: OpenAI Help ↗
My PDF is under the size limit but still causes errors — why?+
Image-heavy PDFs consume far more tokens than text-only PDFs of the same size. A 30MB scanned PDF can exceed an AI's context window even if it's under the file size limit. Compressing reduces both file size and token usage.Source: OpenAI Help ↗
Should I split or compress a large PDF for AI upload?+
Both help. Compressing reduces file size and token usage. Splitting into topic-specific sections improves the AI's ability to find and cite the right information accurately.Source: OpenAI Help ↗
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