You try to send a PDF by email and it bounces because the file is too large. Compressing the PDF is the usual fix. This guide explains what compression can and cannot do, and how to do it privately in your browser.
A PDF can contain fonts, images, unused objects and duplicated data. Scanned documents are usually the biggest, because every page is a high-resolution picture. A text-only PDF of ten pages is often smaller than 200 KB, while a ten-page scan can easily exceed 10 MB.
EuroTools Hub performs lossless optimization: it removes unused data and rebuilds the internal structure of the file. Nothing is blurred and text stays sharp, but there is a limit. PDFs made of large scanned images will shrink less than they would with tools that re-compress the images and lower their quality. If the tool tells you the file was already well optimized, it means there was not much to remove.
Yes. The file is processed inside your browser. It is never uploaded, so it is safe to use for contracts, bank statements and personal documents.
How much smaller will my PDF get? It depends on the file. Documents with a lot of hidden data can drop by 30-60%, while already optimized files barely change.
Will it damage my PDF? No. The content is unchanged, and you keep your original file.
Email services usually limit attachments to 20-25 MB, and many online forms accept only 2-10 MB. As a rule of thumb, aim for under 2 MB for application portals and under 10 MB for email. A text document of 10 pages should be well under 1 MB. If a PDF is much larger, it probably contains images.
Open the tool, choose the file and tap Compress PDF. The tool reports the original and new size. If the result says the file was already well optimised, the document has little unused data left. In that case try one of the other methods below.
Lossless compression removes unused data and rebuilds the file structure without changing how it looks. It is safe: text stays crisp and images stay the same. Lossy compression lowers the quality of images to save more space. It can shrink scans a lot, but small text may become blurry. EuroTools Hub uses the lossless approach, so it is ideal for contracts, forms and documents where quality must not change, but it will not reduce a heavy scan by 90%.
Because your files are processed in the browser and never uploaded, you can safely reduce the size of ID scans, contracts and bank statements without trusting a third-party server. After compression, always open the new file and check that every page is readable before you send it.
It depends on the file. Documents with a lot of unused data can lose 30-60%, while already optimised files barely change, and scans shrink less.
No. The tool uses lossless optimisation, so text stays sharp.
It probably contains large images. Re-scan at a lower resolution or rebuild it from smaller images.
No. Remove the password first with the app that created the file.
Large files take longer because your device does the work, but there is no fixed upload limit as nothing is uploaded.
No. Compression happens in your browser and the file never leaves your device.