Email attachments, government portals, job application forms — they all have one thing in common: a strict file size limit that your PDF never seems to meet. If you need to compress a PDF to under 100KB quickly and for free, you're in the right place.
This guide explains exactly why PDFs balloon in size, what you can do about it, and how to shrink any PDF to 100KB or less using PDFSnap's free browser-based compressor — no software installation required.
Banks, universities, HR portals, and government websites frequently enforce file size limits of 100KB, 200KB, or 500KB for uploaded documents. These limits are often set for server storage, older system compatibility, or simply outdated policies that haven't been updated in years.
The frustrating part: a simple 5-page scanned form might be 3MB just because the scanner saved it at 300 DPI with colour information. The actual text content would fit in a fraction of that size.
Heavy compression reduces image quality inside the PDF. For documents that contain only text (like contracts, letters, or typed forms), compression is nearly lossless. For scanned documents with photos or fine detail, expect some visual reduction at very small target sizes.
Go to pdfsnap.github.io and select "Compress PDF" from the tools menu. No account needed.
Click "Select PDF" or drag and drop your file. The PDF is loaded entirely in your browser — it never leaves your device.
Select Maximum Compression for the smallest file size. For most scanned documents needing sub-100KB output, this is the right choice.
Click "Compress" and download instantly. The tool shows you the before/after file size so you know exactly what you achieved.
PDFSnap processes everything in your browser using JavaScript. Your PDF is never sent to any server. This is especially important for sensitive documents like bank statements, ID copies, or medical forms.
Use PDFSnap's Split PDF or Delete Pages tool to remove blank pages, cover sheets, or appendices before compressing. Fewer pages always means a smaller file.
Colour information triples the data needed for each pixel. If the document doesn't need colour (most text documents don't), converting to grayscale before or during compression can dramatically reduce size.
If you created the PDF from a Word or PowerPoint document, try re-saving with font embedding disabled, then convert again. Many common fonts (Arial, Times New Roman) don't need to be embedded.
If the compressed PDF will only ever be viewed on screen (not printed), downsampling images to 72–96 DPI is invisible to readers but cuts file size by 60–80%.
If the first compression doesn't reach your target, compress the output again. A second pass often squeezes out another 20–30% — though diminishing returns apply after the third pass.
Shrink any PDF to 100KB or less in seconds
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