Best fit
- Portal or mailbox has a hard 5MB attachment limit.
- You must submit one file and cannot split final delivery.
- You need a first-pass flow with minimal resend attempts.
Constraint workflow
Send PDF Under 5MB
Use this when portals reject files over 5MB and you need to pass on the first try.
Target: < 5MBTypical time: 4-7 minMain risk: Readability drop
Workflow steps
- Split by sections first
Segment large files before compression to avoid all-or-nothing failure.
- Remove non-required pages
Shrink size by content pruning before quality tradeoffs.
- Compress to under 5MB
Use email-oriented profile and re-check key text blocks.
Constraint-to-action map
- Hard cap: attachment must be under 5MB · Use split + trim before maximum compression.
- Single-file required by recipient · Compress each section first, then merge minimal successful outputs.
- Dense charts become hard to read · Roll back from maximum to balanced and trim more pages instead.
Final checklist
- Output file is below 5MB with correct page order.
- Small text remains readable at 100% zoom.
- Filename is versioned for easy handoff tracking.
Quality gate before final delivery
- Final file size is under 5MB with correct page order.
- Small text remains readable at 100% zoom after compression.
- Versioned filename is ready for email handoff.
Execution snapshot from a real workflow
Must send a contract packet via email with a hard 5MB cap.
- Split by chapter first
This reveals which sections are size-heavy before tuning.
Checkpoint: Each chapter size is known before merge.
- Trim non-required pages
Content pruning preserves clarity better than over-compression.
Checkpoint: Final packet contains only required sections.
- Compress to target and verify key text
The last MB reduction is where readability often breaks.
Checkpoint: 100% zoom text remains readable on key pages.
Expected outcome: Email accepted on first attempt without readability complaints.
Avoid this: Using max compression immediately and damaging small text.
Applicability boundaries
Not ideal when
- Visual fidelity is more important than strict size limits.
- Recipient explicitly allows multi-file submission.
- Document needs legal-grade numbering and archive references.
Scenario chain: what to run next
Failure scenario matrix
| Signal | Likely cause | Recommended fix |
|---|---|---|
| Still above 5MB after compression | Compression done before removing non-required pages. | Split and trim first, then run compression with size target. |
| Text becomes blurry after export | Compression profile is too aggressive for dense text. | Switch to balanced profile and trim extra pages instead. |
| Recipient cannot open attachment | Wrong format or transfer corruption during mail flow. | Re-export with clean filename and verify download-open once. |