100% Free In-browser Text stays sharp

Compress PDF Free Online

Reduce PDF file size for email, sharing, and uploading. Text and vector graphics stay sharp. All compression runs in your browser.

Drop a PDF here or click to browse

Upload PDF • Choose compression • Download smaller file

Accepts: .PDF
Output: .PDF (compressed)
Related tools: Merge PDF Split PDF Compress Image PDF to JPG

Dead simple

How to compress a PDF

1

Upload your PDF

Drag and drop or click to select your PDF file. The file size is shown before compression.

2

Choose compression level

Select Low, Medium, or High compression. Medium is ideal for email and sharing — text stays crisp.

3

Download smaller PDF

Click Compress and download your smaller PDF instantly. The before/after sizes are shown.

Why JustDownSize

Compress PDF without uploading

Most PDF compressors send your document to a server, process it, and return it. JustDownSize compresses entirely in your browser. Text is never rasterised — only embedded images are downsampled. Vectors and fonts remain sharp at any zoom level.

100% Private
Files never uploaded
Text stays sharp
No rasterisation

How it works

Level Image DPI Best for
Low150 DPIPrint-quality
Medium100 DPIEmail / web
High72 DPIMax compression

Use Cases

Why reduce PDF file size

Email attachment limits

Gmail limits attachments to 25MB; Outlook to 20MB. Compressing a large scanned PDF or presentation brings it within limits without splitting into multiple files.

Website and portal uploads

Government portals, online forms, and HR systems often enforce strict upload size limits (2MB, 5MB). Compressing your PDF gets it under the threshold.

Cloud storage savings

Compressing archived PDFs before uploading to Google Drive or Dropbox significantly reduces storage consumption — especially for photo-heavy reports and scanned documents.

Faster PDF loading

Embedding PDFs on websites or sharing via links is faster when the file size is smaller. A compressed PDF loads in seconds where a full-size file might take minutes on mobile.

Got questions?

Frequently asked questions

It depends heavily on the PDF content. PDFs with large embedded images can be reduced by 50–80%. Text-only PDFs have little to no room for compression since text is already stored efficiently.

No. Text and vector graphics in PDFs are never rasterised during compression — they remain sharp at any zoom level. Only embedded raster images (photos, scans) are downsampled.

Yes. The entire compression process runs in your browser. Your PDF is never sent to any server — you can even use this tool offline after the page loads.

Medium is the right choice for most uses — it balances file size reduction with image clarity. Use Low if you're sending to a printer or need publication quality. Use High if you only need the PDF to be readable on screen.

If your PDF contains mainly text and vectors (no embedded photos), compression has little effect since text is already compact. Scanned PDFs and photo-heavy reports compress the most.

Not directly. Use our Unlock PDF tool to remove the password first, then compress the unlocked file.