B

Bawitools

PDF Compressor

• 100% local, no file uploads

Upload your PDF

Drag and drop or click to select

📄 📄 .pdf · max. 500 MB
WHAT IS OPTIMIZEDRecompress internal streams and remove orphaned objects.

COMPRESSION MODE

Safe

5–25%
Only recompress the ZIP. Preserves absolutely everything: videos, macros, transitions, animations.

RESULT

The compressed file will appear here

Select or drag a file to start
PDF compression guide

Compressing PDF: where your document's weight actually lives

Why a short PDF can take up tens of megabytes, and what can be reduced without ruining it

A PDF is not a document in the way a text file is: it is a container packaging objects of very different natures — text with its fonts, images, vector graphics, forms, annotations, bookmarks — and describing how to place them on the page. When a PDF is too heavy, the first job is finding out which of those objects is eating the space, because the answer completely changes what can be done.

What takes up space in a PDF, largest first

ElementTypical shareCan it be reduced
Embedded imagesAlmost always 80–95% of the fileYes, and it is where practically all the possible gain lives
Scanned pagesEnormous: each page is a full photographYes, a great deal — the case that shrinks most
Embedded fontsFrom tens to a few hundred kilobytesPartially, by embedding only the characters actually used
Text and vectorsVery little, usually kilobytesPractically nothing — and there is no need
Metadata and thumbnailsSmall but it adds upYes, by stripping what is unused

Why images weigh so much inside a PDF

When you insert a photo in Word or a PDF editor, the program normally stores the full image at its original resolution, even if it appears on the page at a quarter of that size. A 12-megapixel phone photo still takes what it takes inside the file, even when the document shows it as a 5-centimetre thumbnail.
PDF compression works mainly on that: it reduces image resolution to what is genuinely needed for their printed or on-screen size, and re-encodes them at an adjusted quality. Hence the huge reductions on documents full of photos, and virtually none on a text-only document.

How much resolution you actually need

Intended useReasonable resolutionNote
On-screen reading, emailing96–150 DPIPlenty for any display; where the file shrinks most
Home or office printing150–200 DPIA good balance for an ordinary laser or inkjet printer
Quality printing300 DPIThe classic print standard; above it you rarely see a difference
Archival or professional prepressDo not re-encodeHere it is best to leave the original alone

What does not change when compressing

  • Text stays text. It is not turned into an image or made unreadable: it remains selectable, copyable and searchable.
  • Page count and order. Compressing does not reorder or remove pages.
  • Links and bookmarks in the document keep working.
  • Page layout. Margins, columns and element positions stay identical; what changes is the internal detail of the images.

When compression will not help at all

If your PDF is a pure text document — a contract, an illustration-free report, an article — it is already about as small as it can be. Text and vectors take up very little by nature, so there is nothing substantial to trim. A 200 KB text PDF will still be roughly 200 KB after compression, and that is correct behaviour.
The opposite case — a catalogue with full-page photos, or a 40-page scanned contract — is where compression shines, because there almost the entire file is pixels.

Compressing your PDF step by step

Check which kind of PDF you have

Try selecting text. If you cannot, it is a scan and you will gain a lot; if it is text, very little.

Upload your file

Drag it onto the drop zone or click to select it. It is processed in your browser, never uploaded to a server.

Pick the compression level

Think about the final destination: screen and email tolerate far more compression than a document headed for print.

Review the result before discarding the original

Open the compressed PDF and check the pages with images. If the quality does not convince you, retry at a lower level.

Text and vector graphics are untouched and look exactly the same. Images are re-encoded and do lose detail, to the degree you choose. That is why it is worth checking the result on the pages with photos before discarding the original.

Almost certainly because it is a text document. A PDF's weight is nearly always in its images; with none, there is no margin. A text PDF is already close to its minimum size.

Yes. Compression acts on the embedded images, not on the text layer. The document remains fully selectable and searchable afterwards.

Yes: the process happens entirely inside your browser. The file is never sent to any server, so a contract or an invoice never leaves your machine.

No. Reducing resolution and re-encoding the images are irreversible. Always keep the original file before compressing.

Considerably, because each page is a full image and scanners typically work at resolutions far above what on-screen reading needs. It is the case where compression gives the most striking results.

Free

No sign-up

100% local compression

Your PDFs are never uploaded to a server

Comments

Log in to leave a comment