100KB Extension v1.1.1: Compress & resize files in 0ms directly in Google Chrome
Batch compress multiple PDF documents at once locally in your browser. Reduce PDF stream sizes to target KB ceilings with 1-click ZIP export.
Compressing large batches of PDF certificates, contracts, and scans no longer requires uploading confidential files to external servers. 100kb.in optimizes up to 500 PDFs in browser WebAssembly RAM, preserving vector text legibility and exporting all compressed files in a single .ZIP package.
| PDF Standard | Stream Compression Engine | Target Size Ceiling | Font Subsetting | Portal Acceptance |
|---|---|---|---|---|
| PDF / A-1b (Scanned Certificates) | FlateDecode + Bi-Cubic Resampling (150 DPI) | 100KB – 300KB | Retained as Vector | 100% (UPSC, NTA, SSC, IBPS) |
| Standard PDF / 1.7 (Multi-Page) | Stream Dictionary LZ77 Deflate | 200KB – 1MB | Full Font Subsetting | 100% (USCIS, UKVI, IRCC) |
| High-Res Print PDF | Uncompressed Native Stream | 2MB – 10MB | Embedded TrueType | Requires Compression for Portal Caps |
Follow these simple steps to optimize and prepare your files secure:
Select or drag up to 500 PDF files into the multi-file bulk dropzone.
Choose your target limit (100KB, 200KB, 500KB) for all PDF streams.
Our WebAssembly engine compresses all PDFs in seconds. Download all files in a single .ZIP archive.
Find answers to common questions about our free online tools.
Lead WebAssembly Systems Engineer at 100KB Tools. Technical specifications researched and cross-verified against official ICAO Doc 9303 Part 9 standards, ISO/IEC 10918-1 JPEG specifications, and PDF/A ISO 19005 guidelines.
Convert JPG, JPEG, and PNG images into PDF files. Automatically scale and compress pages to fit under your desired limit.
Combine multiple PDF documents or certificates into a single file. Control order, sort pages, and optimize output size.
Split PDF documents by custom page ranges or extract specific pages securely with zero data leakage.