Compress PDF to 1 MB

A 1 MB budget is generous for one page and tight for twenty. The table shows why: an A4 page scanned at 300 dpi is about 2,480 by 3,508 pixels, and every scanned page in the file is a picture of that size unless the scanner was set lower. A few of those pages fit well under 1 MB once they are recompressed. Two dozen color pages do not, without making the text hard to read.

That is why the most useful question before compressing is not how much smaller the file needs to be, but how many pages really have to go in it. The compressor will find a way to the target either way; fewer pages simply means each page keeps more detail.

The inch column helps when the scanner software asks for a size in inches instead of millimeters. Multiply the inches by the dpi to get pixels per side: 8.27 inches at 300 dpi is the same 2,480 pixels as in the last column, and the same page at 150 dpi has half as many on each side, a quarter as many in total.

Most upload fields check one file at a time: each PDF has to be under 1 MB, and you can send several. Some portals add up everything you upload instead. The guide for the Indian passport applicant portal published by the Embassy of India in Tallinn is a clear example. It states a maximum of 1 MB, that the total of all uploaded documents should be no more than 1 MB, that documents must be PDF, and that at most five documents can be uploaded per application, including the photograph and signature.

Under a shared rule, compressing every file to 1 MB is not enough. Decide how to split the budget, type each share as the target, and compress each file against its own number. A one-page address proof might get 150 KB while a multi-page document gets 500 KB. Batches here apply one target to every file, so run files that need different shares in separate batches.

Shared limits also explain error messages that seem wrong. A portal can reject a 400 KB file because two earlier uploads already used most of the budget. When that happens, delete the earlier uploads, compress all of them to smaller shares, and upload them again in order.

At this size most text documents come through untouched, and scans lose only detail you would never see at normal zoom. If a scan still looks rough, check its starting point. Photos of documents taken in poor light have gray, noisy backgrounds that cost far more space than a clean flatbed scan, and no compressor can make noise cheap to store.

Convert to grayscale is the strongest single setting for paperwork, and cropping the scan to the edge of the paper is the second. For documents where you only need some pages, Split PDF removes the rest without touching the pages you keep.

When you have the choice, use the scanner's own PDF or document mode rather than photographing the page. It produces flat, white backgrounds and straight pages, both of which compress far better than a photo taken at an angle under room lighting.

For email attachments, where limits are much larger, the fixed levels on the main Compress PDF page are usually enough. For stricter forms, choose a smaller size below.