How to Compress PDF on Android: Reduce File Size for Portal Uploads
Shrink large PDF documents down to under 500KB or 200KB for government job portals, scholarship applications, and email attachments on Android.
Whether applying for TNEA engineering counseling, TNPSC government recruitments, or state scholarships, applicant portals almost universally impose file size caps—typically 200KB to 500KB per document.
High-resolution scanner outputs can easily exceed 5MB to 10MB. Attempting to upload these files results in error messages like 'File size exceeds maximum allowable limit'.
Effective PDF compression targets the specific elements inflating document weight:
1. Downsampling High-DPI Scans: Embedded images scanned at 600 DPI are resized to a readable 150–200 DPI suitable for screen verification.
2. Stream Compression: Image streams are converted using modern DCT or Flate compression algorithms.
3. Stripping Redundant Metadata: Unnecessary application tags, thumbnail caches, and duplicate embedded fonts are removed while preserving readable text.
Balance file size against visual clarity based on your destination:
| Level | Target Reduction | Recommended Use Case |
|---|---|---|
| Low Compression | 15% – 30% reduction | High-detail architectural plans, engineering schematics, or color certificates |
| Recommended / Medium | 50% – 70% reduction | Standard job applications, college counseling, and general email attachments |
| Strong Compression | 75% – 90% reduction | Strict portal portals capping file size at 100KB–200KB |
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Frequently Asked Questions
Will compressing a PDF make the text blurry?
Vector text and fonts remain sharp and infinitely scalable. Compression primarily optimizes high-resolution photo scans embedded within the PDF.