Fit a file

Why is my PDF too large to upload?

PDFs often become large because they contain high-resolution images or many scanned pages. Structural rewriting can reduce some overhead, but shrinking the images may require a different tool or recreating the PDF from smaller source images.

Reviewed

Find out whether the pages are text or images

Try selecting a sentence in a PDF reader. Selectable text is evidence of a text layer, though a scanned page can also contain OCR text over an image. Zoom in: photographs and scans usually reveal pixels, while vector text can stay sharp.

A file’s extension does not tell you how its pages are stored. Two PDFs with the same number of pages can have very different sizes. Embedded images, fonts, attachments, and document structure all contribute.

What FileFit’s PDF reducer actually does

The reducer attempts an object-stream rewrite with pdf-lib and compares the resulting byte count with the source. It returns the original when rewriting is not smaller. It does not downsample arbitrary embedded scans or intentionally rasterize text.

A target such as 200 KB or 2 MB is not guaranteed for an existing PDF. Fit File can compare the measured output against that limit, but checking bytes is not the same as having an engine capable of reaching every target.

Choose the right way to reduce the document

  1. Remove pages the receiver does not need, if permitted, using Split PDF.
  2. If you still have the source photos, resize them and create a new PDF using an appropriate image quality setting.
  3. For a scanned PDF that remains too large, use an editor that explicitly supports embedded-image downsampling, then review text and stamps. FileFit has no advanced scanned-PDF recompression engine.
  4. Keep the original, verify the page count and order, and test text selection and readability in the output.

Preserve the features that matter

Rasterizing an existing document turns its pages into pixels. It can remove selectable text, links, form behavior, and accessibility information. PDF-to-JPG does this intentionally for image export; the structural reducer does not do it by default.

Detected digitally signed PDFs are blocked from editing because rewriting can invalidate the signature. Encrypted documents are rejected. Forms, annotations, attachments, and tags require review and may be lost in editing operations. Do not accept that tradeoff without understanding the document’s purpose.

Try the relevant tools

Sources and implementation

Tool behavior is documented in How FileFit works. Examples are instructional, not a promise about every file. Report a correction.