Compress PDF Online

Reduce PDF file size without leaving your workflow.

Docium compresses PDFs with worker-backed profiles designed for practical file-size problems like upload caps, email attachment limits, and bulky archives. Choose the tradeoff that fits the document.

Low / Medium / Highprofile choices
1 PDFfocused compression per job
Result pagedownload after processing
Why compress

Most PDF size problems are workflow problems in disguise.

People usually search for a PDF compressor because some downstream system is failing: email rejects the file, an upload limit blocks progress, or storage gets messy.

Upload-limit friendly

Reduce file size to fit forms, portals, and systems that reject oversized PDFs before the real task even begins.

Faster sharing

Smaller PDFs are easier to send, open, and move around across teams or devices, especially when bandwidth is inconsistent.

Cleaner archives

Compression helps keep internal storage and exported bundles lighter when documents are preserved long term.

Choosing profiles

Pick the level based on the document’s job, not instinct.

A scanned comic, a design-heavy pitch deck, and a text-forward report do not need the same compression behavior. The right profile depends on what the file must still do well after shrinking.

Low compression

Use when readability and image fidelity matter most and you only need modest size reduction.

Medium compression

Use when you want a balanced result for day-to-day document sharing without pushing quality too far down.

High compression

Use when size is the primary constraint and some quality loss is acceptable to satisfy delivery limits.

Related Utilities

Keep the workflow moving in Docium.

Search-friendly landing pages help people discover the right tool, but the real value is moving smoothly between related document jobs once they arrive.

Merge PDF files

Open

Combine separate PDFs first, then compress the final merged file when the output becomes too heavy.

Split PDF pages

Open

Extract only the necessary pages when reducing scope is a better fix than compression alone.

Convert between PDF and EPUB

Open

Move a PDF into another format when compression is not enough and the delivery target itself should change.

FAQ

Questions people ask before they commit.

How do I compress a PDF in Docium?

Upload one PDF, choose a low, medium, or high compression profile, and submit the job. Docium returns a smaller PDF on the result page when processing finishes.

Which compression level should I choose?

Low keeps more original fidelity, medium balances quality and size, and high pushes harder to reduce size for stricter upload or storage targets.

Does PDF compression always preserve the exact same quality?

No. Compression is always a tradeoff between size and visual fidelity, which is why Docium offers clear low, medium, and high profiles instead of hiding the choice.