Compress PDF File

Reduce PDF file size online, free, with no signup and no watermark.

PDF
up to 25 MB per file
Deleted after one hour

What Compress PDF does

Reduce PDF file size online, free, with no signup and no watermark. In most PDFs the bulk of the file size is embedded images, so compression re-encodes those images more efficiently while leaving your text perfectly sharp — text in a PDF is vector data and never gets blurry from compression. Typical use: getting a scan or image-heavy report under an email or portal upload limit.

What each setting does to a 24 MB scanned report

Setting	Images re-encoded at	Typical result	Visible effect
Recommended	JPEG quality 75, full size	24 MB → 6–9 MB	None at normal zoom
Strong	Quality 55, 85% of pixels	24 MB → 2–4 MB	Slight softening in photos
Extreme	Quality 40, 60% of pixels	24 MB → under 1 MB	Photos clearly reduced; text still sharp
Target size	Whatever reaches the number	e.g. "under 500 KB"	Stops as soon as the target is met

Text and vector graphics are never touched — they are already small. Everything above applies to the raster images inside the PDF, which is where the bulk of the size lives.

How it works

01
Upload the PDF
Choose the PDF that needs to be smaller — up to 25 MB.
02
Run compression
DocsBolt applies stream-level compression.
03
Download the smaller file
Use the result where size matters.

When you'd use it

An email or portal rejects the file for size
A scanned document that came out at 30 MB for ten pages
Dozens of PDFs to archive where the total matters

Formats and limits

Accepts: .pdf — a password-protected PDF needs its password, or Unlock PDF first
Produces: Compressed PDF
Files per run: One
Size limit: 25 MB per file

Limitations

A text-only or vector-only PDF barely compresses; the tool says so instead of returning a bigger file.
A PDF that is already at the target is returned unchanged.

What happens to your file

Processed over an encrypted connection and deleted after one hour.

Full detail in the Privacy Policy.

Questions

Is this the same as reduce PDF size?

Yes — both tools compress PDFs, with slightly different optimization goals. Compress PDF is the general-purpose option; Reduce PDF Size leans harder on size reduction when hitting a strict upload cap matters more than keeping every image crisp.

Will compression make my text blurry?

No. Text in a PDF is stored as vector data, not pixels, so it stays perfectly sharp at any compression level. Only embedded images are re-encoded — that is where the size savings come from.

How much smaller will my PDF get?

It depends on what is inside. Image-heavy files and scans often shrink dramatically because their images were stored at far higher resolution than screens or printers need. A PDF that is mostly text is already small and may barely change.

Why is my PDF so large in the first place?

Almost always embedded images: photos pasted at full camera resolution, scans saved at 600 DPI, or logos duplicated on every page. Compression re-encodes these at a sensible resolution, which is why the text-only parts of the document are untouched.

Is there a file size limit?

Standard documents process in seconds. Very large scanned files may take longer to upload and process — the bottleneck is usually your connection, not the compression itself.

What is the difference between a target size and a compression level?

A target (for example 2 MB) makes the tool search for the highest image quality that still fits under that number, trying a few passes. A level applies one fixed setting. Use the target when a form or email has a hard limit; use a level when you simply want the file smaller.

Are fonts, links and bookmarks kept?

Yes. Compression re-encodes embedded images and rebuilds the file's object streams; text, fonts, hyperlinks, bookmarks and form fields are written back unchanged.

Why is a text-only PDF barely smaller after compressing?

Because there are no images to shrink. A text-only PDF is already small; the remaining size is fonts and page structure, which compression does not touch. Files that shrink dramatically are scans and photo-heavy documents.