Reduce PDF file size to under 20KB for signatures, thumb impressions, and portal requirements with local browser privacy.
To compress a PDF to 20KB: 1. Drag and drop your PDF into PDFBolt. 2. Extreme compression is pre-selected with exact 19.9KB ceiling calibration. 3. Click 'Compress PDF' to download your lightweight file under 20KB instantly.
| Document Type | Mandatory Size | Format | Requirements |
|---|---|---|---|
| SSC CGL / CHSL / MTS Portal | 10 KB – 20 KB | PDF / JPG | Candidate signature & left thumb impression (strict ceiling) |
| UPSC Civil Services & NDA Portal | 20 KB – 300 KB | PDF only | Photo ID proof & identity slip verification floor |
| IBPS PO / Clerk / RRB Recruitment | 10 KB – 20 KB | PDF / JPG | Candidate handwritten declaration & signature scan |
| State PSCs (BPSC, UPPSC, MPSC, TNPSC) | Max 20 KB | Candidate identity slips & verification uploads | |
| GATE / JAM / NTA Candidate Upload | 10 KB – 20 KB | PDF / JPG | Official signature slip verification threshold |
Shrinking a PDF document below 20KB is one of the most restrictive document constraints enforced by Indian recruitment portals (SSC CGL/CHSL, IBPS, and State PSCs). A standard multi-page document or one containing embedded TrueType font families often has a minimum floor of 150KB–200KB solely in font metrics and structural dictionaries. To hit 20KB, the document should be a single page, cropped signature, or certificate scan.
PDFBolt achieves the 20KB target by deflating object streams, stripping unnecessary XML metadata, and downsampling raster layers into optimized 8-bit grayscale channels. Our engine targets an exact 18 KB – 19.9 KB safety ceiling, ensuring portal validators enforcing strict '< 20KB' rules never reject your upload due to byte rounding.
Many Indian recruitment exams (such as SSC and IBPS) specifically request signatures in JPEG/JPG format between 10KB and 20KB, while others mandate PDF. Always check your official notification guidelines before uploading. If your portal requires an image file instead of a PDF, you can instantly convert your output using PDFBolt's free PDF to JPG or JPG to PDF tools.
Yes. Most government job portals (such as SSC, UPSC, and State PSCs) mandate document or signature sizes between 10KB and 20KB. PDFBolt is calibrated to meet these exact thresholds with an automated 19.9KB ceiling.
PDFBolt targets an exact 18 KB to 19.9 KB window. Government portal upload validators typically check if the file size is strictly less than 20,480 bytes, so landing at 19.2 KB prevents any upload rejection errors.
No. Our algorithm applies high-contrast curve preservation to dark ink strokes against light paper backgrounds, ensuring your signature remains crisp, dark, and verified by human examiners.
Fitting more than 1 or 2 pages into 20KB is technically difficult because page structures, font tables, and vector objects each require several kilobytes. If your multi-page document cannot reach 20KB, check our 50KB or 100KB compressors.
100% private. All compression processing occurs inside your device's browser memory using local WebAssembly. Zero files or personal data are ever uploaded to remote servers.
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