PDF Compressor

Reduce PDF file size by rasterising and re-encoding pages at lower DPI / JPG quality. Lossy — best for image-heavy decks.

100% in your browser — files never uploaded.
Postcrest — full AI image suite

Need more than a converter? AI background removal, upscale, edit and generate — one workspace.

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How to use the PDF Compressor

  1. 1
    Drop a PDF
    Any standard PDF.
  2. 2
    Configure
    Adjust settings to taste.
  3. 3
    Process + download
    Result is ready in seconds.

About this tool

Uses pdf-lib in your browser. No upload.

Source PDF is unchanged - the new file is generated fresh.

Frequently asked questions

Are files uploaded?
No - every step runs in your browser.
Encrypted PDFs?
Decrypt first using your PDF reader.
Big PDFs?
Limited only by your device's memory.
Commercial use?
Yes - output is yours.
Mobile-friendly?
Yes.

Need more than free tools? Get Postcrest's full AI image suite.

AI background removal, AI upscaling, AI image editor and AI photoshoot — every leading model in one workspace.

AI Image Generator
Every leading model — Flux, Nano Banana, Seedream, GPT-Image, SDXL.
AI Image Editor
Inpaint, outpaint, object removal — describe the edit, AI applies it.
AI Background Remover
Pixel-perfect cutouts in seconds — transparent PNG or any new scene.
AI Image Upscaler
Upscale to 4K, face-aware, print-ready, watermark-free.
Get started — access every AI tool
50% off your first 2 months. Cancel anytime.