Why are PDFs so large?
PDFs can embed fonts, high-resolution images, colour profiles, and various internal structures. A single scanned page at full resolution can easily reach several megabytes. A 10-page scanned document can top 50 MB — far too large for most email systems.
What browser-based compression can do
Our PDF Compressor reduces file size by cleaning up and re-organising the PDF's internal data. Redundant content, duplicate objects, and inefficient structures are removed. For text-heavy PDFs, expect reductions in the range of 10–40%. The results vary — some files compress dramatically, others less so, depending on how the original was created.
What compression can't fix
If a PDF is large primarily because it contains high-resolution images embedded at print quality, browser-based compression has limited effect on those images. For those cases, desktop tools provide more control over image recompression at the cost of some additional setup.
Tips to keep PDFs small from the start
The easiest way to avoid large PDFs is to start with optimised sources. If you're creating a PDF from images, first convert them to WebP using our JPG to WebP converter to reduce their size before including them in the document.
Remove metadata to trim a few extra bytes
PDFs embed creation dates, author names, software details, and other metadata that contributes to file size. Our PDF Metadata Remover strips this information while leaving the document content completely intact.
Frequently Asked Questions
- How much will my PDF compress?
- Results vary significantly by source. PDFs created from word processors or presentations often compress by 20–40%. Scanned PDFs — which are essentially image files wrapped in a PDF container — see less benefit without also recompressing the images.
- Does compressing a PDF reduce its visual quality?
- Our tool uses lossless PDF optimisation. Text and vector content are not degraded. Existing embedded images are not recompressed, so their quality is preserved exactly as in the original.
- Is it safe to compress confidential PDFs online?
- With BeYourTools, all processing happens locally in your browser. Your PDF never leaves your device, so there's no risk of sensitive content being transmitted or stored anywhere.