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How to compress a PDF to under 1 MB

A limit of 1 MB turns up on e-filing systems, insurance claim forms, rental and visa applications and some upload gateways that forward files by email. The documents are longer than a single form, and they often include photos that have to stay clear: damage to a car, a room, a receipt. This guide shows how to get under the limit without making those photos useless.

Updated September 15, 20265 min read

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On this page
  1. 01Where the megabytes go in a longer document
  2. 02Compress a PDF to under 1 MB, step by step
  3. 03Photos that must stay clear
  4. 04When one file cannot get under 1 MB

Where the megabytes go in a longer document

In a report or a claim the text is rarely the problem. The weight sits in photos inserted at the full resolution of the camera that took them, and in scanned pages, each of which is one large image. A handful of phone photos can take a document from a few hundred kilobytes to tens of megabytes.

That is good news for a 1 MB target: those photos usually hold far more detail than a page can show, so there is room to reduce them before anything visible is lost.

Compress a PDF to under 1 MB, step by step

Compress the whole document in one go; the target applies to the file you upload.

  1. Open Compress PDF, add the document and type 0.9 in the target size box. The box is in megabytes, and 0.9 MB is about 944 KB.
  2. Run it. Image quality is lowered first, and images are scaled down only when quality alone cannot reach the target.
  3. Open the result at the size the reader will see it: full screen for photos, 100% zoom for small print.
  4. If an important photo is too soft, remove pages the recipient does not need with Remove Pages and compress again, so the remaining images keep more of the budget.

Some systems read 1 MB as 1,000,000 bytes and others as 1,048,576. A target of 0.9 is under both.

Photos that must stay clear

For evidence photos in a claim or an inspection report, legibility matters more than hitting the smallest possible size. Compressing a photo-heavy document hard to force it into one file can blur exactly the detail an assessor needs.

  • Remove duplicate or near-identical shots before compressing; each one costs as much as a unique photo.
  • Grayscale PDF suits scanned text pages in the same document, but keep colour for photos where colour carries meaning, such as damage or stains.
  • If the system accepts several files, send the photos as a separate upload and keep the text pages in their own file.

When one file cannot get under 1 MB

If the tool says the document would still be around a certain size even with every image removed, the text and page structure alone are over the target. And a long scan can reach the target yet come out too blurry to read.

If the system accepts more than one upload, Split by size breaks the document into parts that each stay under a limit you choose, such as 0.9 MB. That keeps every page readable and every part within the limit.

Do it now

Frequently asked questions

You do not have to. Compress PDF recompresses the images already inside the document, so you can build the file first and compress it once at the end.

Often not at a quality anyone can read, because that leaves about 10 KB per page. Removing pages that are not needed, or splitting the file into parts under 1 MB, gives a better result than forcing it.

No. The document is compressed without being transmitted and no copy is kept, so a claim or an application with personal details stays with you.

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