How to Compress PDF Online Free (15MB, 20MB+ Files)
Upload failed because your PDF is too large? Government portals, college forms, and email often limit PDF size to 5MB or 10MB. Here is how to compress a large PDF online — free, private, and without installing software.
Quick answer: Drop your scan into Compress PDF, pick Balanced or Strong, preview text readability, and re-upload when DigiLocker or form portals reject MB size.
Why PDFs Become Too Large
- Scanned documents saved as high-resolution images inside the PDF
- Multiple pages from phone camera scans
- Certificates and marksheets scanned at full quality
Compress PDF in 4 Steps
- Open PhotoBandhu Compress PDF.
- Upload your PDF (up to ~50MB).
- Choose preset: Balanced for normal use, Strong or Maximum for 15MB+ files.
- Optional: set target Under 5 MB or Under 10 MB, then download.
Which Preset to Use?
Balanced — Good quality, moderate shrink. Best for readable documents.
Strong / Maximum — Smallest file. Best when portal rejects your upload.
Still Too Large? Merge First
If you combined files with Merge PDF, compress after merging. Large textbooks may take 1–3 minutes on phone — keep the tab open.
Privacy
Your PDF stays on your device. PhotoBandhu does not upload files to any server.
Balanced vs Strong vs Maximum
| Preset | Size reduction | Best for |
|---|---|---|
| Balanced | Moderate | Readable marksheets, text PDFs |
| Strong | High | 10MB → 5MB portal cuts |
| Maximum | Aggressive | Last resort when upload still fails |
Step-by-step: compress PDF online free
- Check the official upload page or notification for the exact MB limit (2, 5, 10, etc.).
- Open Compress PDF in Chrome and upload your file.
- Start with Balanced; preview text on page 1 after download.
- If still over limit, retry with Strong or set target Under 5 MB.
- For merged bundles, compress after Merge PDF; split first if only one section is huge.
- Keep the original uncompressed PDF archived until your application is confirmed.
Common mistakes
- Using Maximum on the first try — text on certificates can become fuzzy.
- Compressing the same file repeatedly — quality drops fast.
- Uploading a scan at 600 DPI when 150–200 DPI is enough for forms.
- Forgetting that some portals count per-file and total size separately.
- Relying on outdated MB limits from previous year notifications.
Related guides
Reminder: For DigiLocker, scholarships, and recruitment uploads, confirm max PDF size and readability requirements on the official site each cycle.
Typical India portal caps
Scholarship income proofs at 1MB, SSC certificates at 2MB — varies. Always read live notification.
Compress workflow
- Try split first if only one page needed.
- Compress PDF once — multiple passes blur text.
- Zoom 150% to read roll numbers after compress.
- Keep uncompressed backup locally.
Common mistakes
- Compressing already OCR’d tiny PDF — no benefit.
- Using photo of paper instead of scan PDF.
- Uploading corrupted download from broken network.
FAQ
How to compress PDF online free without uploading to server?
Use PhotoBandhu Compress PDF — files are processed in your browser and are not sent to our servers.
How to reduce 15MB PDF to 5MB?
Upload to Compress PDF, choose Strong or Maximum preset, optionally set Under 5 MB target, then download.
Will compressed PDF text remain readable?
Balanced preset keeps text clear for marksheets and certificates. Use Strong only when the portal strictly rejects file size.
Can I compress PDF on phone?
Yes — works in mobile Chrome. Large PDFs may take 1–3 minutes; keep the tab open.
Is PDF compression free on PhotoBandhu?
Yes — no account required.
PDF still too large after compress?
Try Split PDF first, remove blank pages, or scan documents at lower DPI before converting to PDF.