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Problem

PDF Is Too Large

Short answer: If a PDF is too large, the fix is to reduce the size of its largest components — page images, embedded fonts and redundant objects — or to rasterise the pages entirely. PDF JustFit can compress a PDF to an exact target size instead of asking you to guess a quality level.

What this looks like

A PDF that has become too large is usually not one file but several problems stacked together: high-resolution scans, embedded images, unused fonts and accumulated metadata. Knowing which is dominant tells you which compression mode to use.

  • The file is tens of megabytes for a document that looks simple.
  • Email clients refuse to attach it.
  • Upload forms reject it for exceeding a size limit.
  • Sharing it takes far longer than the document seems to justify.

Why it happens

  • Scanned pages stored as high-resolution images.
  • Photographs embedded at print resolution.
  • Long documents with hundreds of pages.
  • Embedded fonts and duplicated page objects.

How to fix it with PDF JustFit

  1. Open the PDF in PDF JustFit

    Pick the file from Files, or send it to PDF JustFit from the share sheet.

  2. Enter a target size

    Type the size you actually need, for example 2 MB, or choose a preset.

  3. Choose a compression mode

    Smart keeps text selectable; Maximum rasterises pages for the smallest file.

  4. Compare the result

    Check the original and the compressed version side by side, page by page.

  5. Export or share

    Save the optimised PDF, or share it straight from the app.

Frequently asked questions

Why is my PDF so large?

The most common cause is scanned pages stored as high-resolution images. Embedded photographs, long page counts, embedded fonts and redundant page objects also contribute.

How do I make a PDF smaller?

In PDF JustFit, open the PDF, enter the target size you need, choose Smart or Maximum compression, compare the result and export. The two-stage solver searches for the best quality at that size.

Download on the App Store

Related pages

PDF JustFit features

Exact-Size CompressionSet an exact target PDF size — for example 2 MB for an email attachment — and let PDF JustFit search for the best possible quality automatically.Smart CompressionSmart compression in PDF JustFit reduces file size while keeping text, fonts and document structure fully selectable.Maximum CompressionMaximum compression in PDF JustFit rasterises pages to produce the smallest possible file, ideal when a hard size limit must be met.HistoryEvery result is saved to History with the original size, the output size and the savings at a glance, so nothing gets lost.

Problems this solves

PDF Is Too Large for EmailEmail attachment limits explained, and how to compress a PDF to a size that will actually send.PDF Is Too Large to UploadWhen a website or portal rejects a PDF for exceeding its size limit, here is how to bring the file under the cap.Compress a PDF on iPhoneHow PDF compression works on iPhone — from Files, from the share sheet, and without a desktop computer.

Guides

Sources

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Keep your documents light, organized and private

PDF JustFit: Compress, AI Chat is available on the App Store for $9.99. Requires iOS/iPadOS 26.5 or later.

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