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FILE_SIZE_LIMITS.md

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FILE_SIZE_LIMITS.md

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File Size Limits

Current Implementation

Files are now uploaded directly to Apps Script from the client, bypassing Vercel's 4.5MB limit.

Limits

✅ What Works Now

  • Per file: Up to 100MB (Apps Script limit)
  • Total per request: Up to 500MB (Apps Script safe limit)
  • Files per order: Up to 20 files (Apps Script limit)

⚠️ Previous Limitations (Now Fixed)

  • Vercel proxy limit: 4.5MB total request size ✅ BYPASSED
  • ~~Effective file limit: ~3.4MB per file (due to base64 encoding + Vercel limit)~~ ✅ FIXED

How It Works

  1. Client → Uploads files directly to Apps Script (no Vercel proxy)
  2. Apps Script → Receives files and uploads to Google Drive
  3. No size restrictions from Vercel (up to Apps Script's limits)

Setup Required

1. Environment Variable

Add to your .env.local and Vercel:

NEXT_PUBLIC_APPS_SCRIPT_WEB_APP_URL=https://script.google.com/macros/s/YOUR_URL/exec

Important: The NEXT_PUBLIC_ prefix makes it available on the client side for direct uploads.

2. Apps Script Deployment

Make sure Apps Script is deployed with:

  • Execute as: Me
  • Who has access: Anyone (required for CORS to work)

3. CORS

If you get CORS errors:

  1. Check Apps Script deployment settings (must be "Anyone")
  2. Redeploy Apps Script after changing settings
  3. Clear browser cache

Testing

Test with files of different sizes:

  • ✅ Small files (< 1MB): Should work
  • ✅ Medium files (1-10MB): Should work
  • ✅ Large files (10-100MB): Should work
  • ❌ Very large files (> 100MB): Will fail (Apps Script limit)

Base64 Encoding

Files are still base64-encoded before sending (required by Apps Script), but this no longer matters since we're not going through Vercel's 4.5MB limit.

Base64 increases file size by ~33%, so:

  • A 75MB file becomes ~100MB when base64-encoded
  • This is still within Apps Script's 100MB limit per file

Future Improvements

For files > 100MB, we could implement:

  1. File chunking: Split files into smaller chunks
  2. Resumable uploads: Use Google Drive's resumable upload API
  3. Direct Drive API: Use OAuth and upload directly to Drive (more complex)