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📍 Kalupur Middle Para, Murshidabad

🗜️ Custom PDF Compressor

Intelligently shrink your PDF to an exact Target KB size without losing quality.

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Upload PDF File

Click here to select a PDF

⚙️ Smart processing in progress... please wait ⏳
Description File Size
📂 Original Size —
✅ Compressed Size —
📥 Download Compressed PDF

🗜️ How Custom PDF Compressor Works

Government recruitment boards, college admission portals, and scholarship systems in India commonly impose strict file-size limits (such as "Upload marksheet under 100 KB" or "Certificate between 50 KB and 200 KB"). Traditional compressors merely reduce quality by arbitrary percentages (e.g. low/medium/high), often leaving the file still too large or making text unreadable.

Our Custom PDF Compressor uses a client-side binary search algorithm. It dynamically renders PDF pages at varying resolutions and JPEG compression qualities (through 6 outer scale passes and 6 inner quality tests) to calculate the maximum visual clarity that fits within your exact Target KB ceiling.

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Exact Target KB Slider

Set any target limit from 30 KB up to 1000 KB in 10 KB increments to match online portal specifications.

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Binary Search Tuning

Iteratively tests multi-page canvas render scales and JPEG quantization tables to find the sharpest possible compression.

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Text-Safety Guard

Detects purely text-based vector PDFs and preserves the original file if rasterization would inadvertently increase size.

📋 Step-by-Step Compression Guide

  1. Upload PDF: Click the upload zone and select the PDF document you wish to shrink.
  2. Inspect Current Size: The original file size (in KB) is displayed in the comparison table.
  3. Set Target KB: Move the slider to your required target (e.g. 100 KB, 200 KB, or 500 KB).
  4. Click Compress: Click "Reduce Size to Target KB". The in-browser engine tests resolutions and builds the compressed document.
  5. Download Result: Once compression finishes, click "Download Compressed PDF" to save the output file.

⚙️ Technical Limitations & Quality Considerations

To achieve precise kilobyte reductions, the tool renders vector pages into optimized JPEG streams. Please keep the following technical considerations in mind:

🔒 Privacy & Local Processing Disclosure

100% Client-Side In-Browser Execution: PDF page parsing (via PDF.js) and document reconstruction (via PDF-Lib) occur exclusively within your device's browser memory (RAM). Your confidential documents are never uploaded to Pragati Telecom servers or third-party cloud services.

❓ Frequently Asked Questions (PDF Compressor)

Why did the compressed size end up slightly below my target?
To ensure your document never exceeds the maximum portal limit (e.g. a 200 KB limit failing at 200.5 KB), the binary search algorithm ensures the output size is strictly less than or equal to your chosen Target KB.
Will compressed text remain readable?
For standard target settings (100 KB–300 KB per single page), certificates, signatures, and marksheets remain clear and legible for verification officers.
Can I compress multi-page PDF documents?
Yes. The compressor automatically loops across all pages in the PDF document, applying consistent resolution and compression quality to each page.
Why did the tool tell me my text-based PDF was preserved?
Certain digital PDFs consist purely of compact vector text fonts. Converting clean vector text into image-based JPEG pages can actually increase file size; in such cases, the tool intelligently preserves your original file.
Is there a file upload limit?
Because processing happens in your browser's RAM, documents up to 50 MB with 10–20 pages can be compressed easily on standard computers and smartphones.
Related Utilities & Guides: 📖 Target KB Compression Guide ✏️ Smart Visual PDF Editor 📑 Drag & Drop PDF Maker 🔎 Searchable PDF Maker