If your notification says “PDF under 100KB” and your caste certificate is 1.2 MB, you need exact-size compression — not a random “High” preset. Compress PDF to 100KB is the tightest limit for SSC, UPSC, banking and scholarship portals, and it needs the most careful handling to keep your photo and signature verifiable.
⚡ Quick Answer
Use ToolsLead — Compress PDF Under 100KB → Upload PDF → Select “Exactly 100KB” → Enable Grayscale for B/W docs if photo not required in color → Download. Free, no signup, ≤10 seconds, preserves text as vector.
Why SSC/UPSC Demand Under 100KB
India's high-volume portals store crores of PDFs. 100KB is the sweet spot for:
- SSC CGL/CHSL/MTS, UPSC EPFO, IBPS PO/Clerk, Railway RRB — Caste/EWS/PwD certificate: 50–100KB, Photo: 20–50KB, Signature: 10–20KB
- Scholarship (NSP, State) — Income certificate: under 100–150KB
- CUET/PG, NTA exams — Category certificate: under 100KB
- Bihar, UP, MP State PSC — Domicile: under 200KB (but many still ask 100KB)
Servers auto-reject at 101KB — not 100.5KB. Hitting ≤100KB with margin (95–99KB) is critical.
Photo & Signature: Separate Limits Explained
Most SSC notifications list three limits:
| File | Typical Limit | Recommended Tool Setting |
|---|---|---|
| Photograph (JPG/PDF) | 20–50KB | JPG to PDF → Fit image → Compress Under 100KB (then verify ≤50KB) |
| Signature (JPG/PDF) | 10–20KB | Crop tightly → JPG to PDF → Under 100KB (Maximum compression) |
| Certificate PDF | Under 100KB | Compress Under 100KB — Balanced |
Pro tip: Never paste photo + signature + certificate into one PDF for SSC — upload them as separate files. Compress each to its own limit.
Step-by-Step: Compress to Exactly 100KB
- Go to Compress PDF Under 100KB.
- Upload certificate (drag & drop, up to 50MB). For photo/signature JPG, first use JPG to PDF with Fit image, 0 margin to make a tight PDF.
- Choose Exactly 100KB → Toggle Grayscale ON for black-white scans (saves ~45% without losing legibility) → Keep Balanced quality.
- Click Compress. Engine binary-searches JPEG quality (85%→55%→35%) and DPI (150→120) until ≤100KB.
- Download → Right-click → Properties → Confirm ≤100KB → Zoom to 150% → Check signature stroke and photo face are sharp.
Keep Photo & Signature Sharp at 100KB
- Crop white borders before converting JPG to PDF — white borders are still image data and waste 30–60KB.
- Don’t use 600 DPI scans: Rescan at 200 DPI grayscale for B/W docs. If you must keep color photo, use 150 DPI color.
- Avoid re-compressing: Don’t compress an already compressed PDF again — artifacts double. Start from original.
- Use vector where possible: Export from Word as “Best for electronic distribution” not “Best for printing” — reduces embedded font size.
5 Rejection Reasons to Avoid
- Still 102KB: Portal rejects. Re-compress with Maximum + Grayscale.
- Blurred signature: You used 72 DPI. Use Balanced 130 DPI minimum.
- Multi-page certificate as images: Each page as 300 DPI color = 300KB. Convert to grayscale.
- Merged 3 certs into one 300KB PDF: SSC asks for single cert — split with Split PDF first.
- Wrong file type: Some portals accept only JPG for photo — don’t send PDF where JPG required. Use PDF to JPG if needed.
Need exactly 100KB now?
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Compress to 100KB →