Slack file upload failing or throwing an error? Compress your PDF instantly using the tool below — fixes both standard upload errors and Slack API size limits.
👉 Fix: Compress your file below the required limit using the tool above.
Slack upload failures can be caused by exceeding the 1GB standard limit, the 10MB API limit, or workspace storage being full (5GB on free plans). Compress your PDF here to rule out file size as the cause.
The most common causes are: file exceeds 1GB (standard upload), file exceeds 10MB (API integration), or the workspace has hit its 5GB free storage limit. Compress your PDF to rule out file size as the cause.Source: Slack Help ↗
File too large (over 1GB for UI uploads, over 10MB for API uploads), workspace storage full (free plan: 5GB), missing file extension in API uploads, or network issues.Source: Slack Help ↗
First, compress your PDF to reduce file size. If the error persists, check whether your workspace has hit its storage limit (free plan: 5GB). For API uploads, ensure the file extension is included.Source: Slack Help ↗
Free workspaces have 5GB total storage per workspace. When this is full, uploads will fail. Paid plans (Pro, Business+, Enterprise Grid) offer unlimited storage.Source: Slack Help ↗
Slack API integrations and user-facing file inputs enforce a 10MB limit, separate from the 1GB standard upload limit. Compress your file below 10MB before sending it via the API.Source: Slack Help ↗