Compress PDF for Slack

Slack allows PDF uploads up to 1GB per file. For API-driven integrations, the limit drops to 10MB. Compress your PDF here if it exceeds either limit.

🔒 Files never leave your device⚡ Instant processing in browser💸 100% free — no signup

📄

Drop your PDF here to fix upload errors

or click to select file — PDF only

Target size (optional)

targeting 1024 MB

⚡ Slack File Size Limits (Quick Fix)

•Slack allows file uploads up to 1GB per file for all users.
•Free Slack workspaces have 5GB total storage per workspace, with files older than 90 days becoming inaccessible.
•For API-driven or user-facing file inputs in Slack integrations, the effective limit is 10MB per file.

👉 Fix: Compress your file below 1024 MB using the tool above.

About this tool

Slack supports up to 10 files per drag-and-drop upload. Free workspaces have 5GB total storage with 90-day file retention. Paid plans offer unlimited storage. For Slack API integrations and bots, keep files under 10MB.

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

→Slack allows file uploads up to 1GB per file for all users.Slack Help ↗
→You can drag and drop up to 10 files at once into a Slack message field.Slack Help ↗
→Free Slack workspaces have 5GB total storage per workspace, with files older than 90 days becoming inaccessible.Slack Help ↗
→Paid Slack plans (Pro, Business+, Enterprise Grid) offer unlimited file storage and access.Slack Help ↗
→For API-driven or user-facing file inputs in Slack integrations, the effective limit is 10MB per file.Slack Help ↗

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❓ Frequently Asked Questions

What is the maximum file size for Slack uploads?+

1GB per file for standard Slack uploads. For API-driven integrations and user-facing file inputs, the effective limit is 10MB.Source: Slack Help ↗

How many files can I upload to Slack at once?+

Up to 10 files at once via drag and drop into the message field.Source: Slack Help ↗

Does Slack delete files on the free plan?+

On the free plan, files older than 90 days become inaccessible, and files older than one year are deleted. Paid plans offer unlimited storage and access.Source: Slack Help ↗

Why is my Slack API file upload failing at under 1GB?+

API-driven and user-facing file inputs in Slack integrations have a lower effective limit of 10MB. Compress your file below 10MB before uploading via the API.Source: Slack Help ↗

Are Slack files searchable?+

Yes. Files uploaded to Slack are searchable and shareable across public channels, private channels, and direct messages.Source: Slack Help ↗

🔒 Files stay on device·🆓 Free forever·📵 No signup required

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