Skip to content
DYNAMB

Compress PDF — free, private, in your browser

Shrink a heavy PDF by re-rendering its pages as compressed images at the quality and sharpness you pick. It works brilliantly on scanned documents, and because everything runs inside your browser, the file is never uploaded anywhere. One honest caveat: the result is image-based, so its text is no longer selectable.

  • No upload — files stay on your device
  • Works offline once loaded
  • Free forever, no signup, no watermark
Drop a PDF here, or tap to choose Contracts and statements are safe — nothing is uploaded

The output is guaranteed at or under this size whenever the page count allows it — the practical floor is roughly 10 KB per page.

70% keeps scans clearly readable; drop lower only when size matters more than crispness.

Honest trade-off: this compressor re-renders every page as a JPEG image. Scanned documents shrink dramatically, but the result has no selectable text — like a photocopy. If you need the text layer kept, don't use a rasterising compressor.

{{ stage || 'Working…' }}
  • Original {{ sourceSizeLabel }}
  • Compressed {{ resultSizeLabel }}
  • Saved {{ savedPercent }}%
  • Pages {{ pageCount }}

Landed under your {{ targetLabel }} target.

Even at the lowest quality and scale, this document cannot reach {{ targetLabel }} — the practical floor is about 10 KB per page. This is the closest result; splitting the PDF into parts is the reliable fix.

Pages are now images — text is no longer selectable.

How to use this tool

  1. Add your PDF

    Drop the file onto the box or tap to choose it. Its size and page count are read on your device — nothing is transmitted.

  2. Pick quality and sharpness

    Use the quality slider and DPI setting to trade file size against crispness. 70% at 120 DPI keeps scans clearly readable.

  3. Compress and download

    Every page is re-rendered and rebuilt into a smaller PDF. Check the before-and-after sizes, then download.

Questions people ask

How does this PDF compressor work?

Each page is re-rendered to an image and re-encoded as a JPEG at the quality you choose, then the pages are rebuilt into a new PDF. For scans — which are images already — this typically cuts the size dramatically.

Will the text still be selectable after compressing?

No, and we say so up front: the pages become images, like a photocopy. If you must keep a selectable text layer, a rasterising compressor is the wrong tool — but for portal uploads of scans, it is exactly the right one.

Why did my PDF get bigger instead of smaller?

A PDF that is mostly real text is already stored far more compactly than any image can be, so re-rendering it as pictures makes it larger. The tool detects that case and tells you to keep your original instead of handing you a worse file.

Is my document uploaded to a server?

Never. The rendering and rebuilding run entirely inside your browser using open-source libraries served from this site, and the page keeps working if you go offline after it loads.

How small can my file get?

A practical floor is roughly 10 KB per page for readable A4 output. A 30-page document therefore cannot honestly reach 100 KB — splitting it first is the reliable fix.

Does it work on a phone?

Yes. Compression is heavier than image tools, so a long document takes a little while on a budget phone, but the process is chunked page by page so the browser stays responsive.

Related tools

Free because it costs us nothing to run: your browser does the work, not our servers. Made by Dynamb Technologies — we build software for businesses.