tooloora

Compress PDF — reduce file size in your browser

Shrink a PDF with a chosen strength (quality vs. size) — processed locally, your file is never uploaded.

Runs locally — nothing is uploaded

Drop PDFs here or click

Multiple files allowed · stays local

Runs locally in your browser — no upload.

Make a PDF smaller — in your browser

Reduce the file size of one or many PDFs without uploading them anywhere. Pick a compression strength, and the tool rebuilds each document at a lower resolution and image quality. You see the before/after size immediately and download the result. Everything runs in your browser — your files never leave your device.

Choose your trade-off

  • Low — gentle compression, keeps the most visual quality (≈150 dpi).
  • Medium — a balanced default (≈120 dpi).
  • Strong — smallest file, more visible quality loss (≈96 dpi).

How it works (and the honest trade-off)

Each page is rendered to an image and re-encoded as JPEG, then assembled into a new PDF. This is what makes scans and image-heavy PDFs much smaller. The important trade-off: because pages become images, text is no longer selectable or searchable, and a PDF that is mostly text or vector graphics may not shrink — or could even grow. The tool tells you the result size and warns you when there's no benefit, so you can simply keep the original.

If you need to preserve selectable text, keep the original file or use a tool that compresses without rasterizing.

Can I compress several PDFs at once?

Yes. Drop in as many files as you like — they are processed one after another and come back as a ZIP (a single file stays a single PDF). If one file fails, for example because it is password-protected, you still get the rest, and a note below tells you which file was skipped and why.

What happens if I cancel?

A progress bar shows the current page and file; Cancel stops the run right away. A cancelled run deliberately returns nothing — a half-compressed PDF that looks finished would be more dangerous than no file at all.

Private by default

There is no upload, no queue and no file-size paywall like on cloud compressors. The whole process happens on your device with open-source libraries (pdf.js + pdf-lib) — it even works offline.

Frequently asked questions

Is my PDF uploaded to compress it?

No. Compression runs entirely in your browser using your device's resources. The file never leaves your device — ideal for confidential documents.

How does the compression work?

Each page is rendered to an image at a chosen resolution and re-encoded as JPEG at a chosen quality, then rebuilt into a new PDF. Lower strength keeps more quality; higher strength saves more space.

Why did my PDF not get smaller (or got bigger)?

Because pages become images, this works best for scans and image-heavy PDFs. A PDF that is mostly text or vector graphics may not shrink — or could even grow. The tool shows the before/after size and warns you when there's no benefit, so you can keep the original.

Will the text still be selectable afterwards?

No. The pages are turned into images, so text is no longer selectable or searchable. If you need selectable text, keep the original or use a tool that preserves the text layer.