Large files that need to travel
Ten megabytes is a typical attachment limit in workplace email systems and on many learning platforms where students upload assignments and teachers post course materials. It's a generous limit, so the files that hit it are genuinely big: a 60-page report full of photos, a scanned thesis, a set of architectural drawings saved as images, a lab notebook scanned in color, or slides exported to PDF at full resolution.
Because 10 MB leaves plenty of room, the goal here is light-touch compression. ConvertirDocs stops reducing quality as soon as the file is under the target, so for most documents the changes are hard to spot even when zoomed in.
Course submissions and teaching materials
Students often hit the limit with handwritten work photographed page by page and combined into one PDF. Every phone photo can weigh several megabytes, so twenty pages add up fast. Compressing to 10 MB keeps handwriting and diagrams readable for grading while getting the file through the upload form.
Teachers sharing readings or slide decks face the same problem in reverse: students download on phones and slow connections. A lighter file opens faster for everyone. If the target leaves room, you can even type a smaller number, like 5 MB, and compare the result.
Reports and presentations at work
Business reports and exported presentations get heavy because of their images: product photos, screenshots, photos of a site visit. The engine recompresses JPEG and 8-bit photos and leaves text and vector graphics, such as charts, tables and logos drawn as shapes, exactly as they were. Numbers in a table stay sharp, and the text can still be searched and copied.
If the document is meant only for reading on screen, you can also use the main “Compress PDF” page and pick the Recommended level, which doesn't aim at a specific size.
Very large files and privacy
Compression happens on your own device, inside the browser. The file isn't uploaded and nothing is stored, which matters for internal reports and student work alike. With very big PDFs, over 150 MB on a phone or 500 MB on a computer, you'll see a warning about memory, but you can still try. A computer will handle large files more comfortably than a phone.
If 10 MB can't be reached, usually because the weight comes from fonts or image types the engine leaves intact, you get the smallest version achieved and the reason. “Split PDF” can then break the document into parts. ConvertirDocs is free, with no sign-up and no watermark.