Compress PDF

Drastically reduce PDF file sizes while maintaining excellent visual clarity.

Drag & Drop PDF files or Entire Folders here

or click to select individual files or an entire folder with all subdirectories

Supports full folder selection, auto-extracts all PDFs and preserves directory structure

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Compress PDF to 400 KB – Under 400 KB in One Click

Reduce any PDF to 400 KB or less for application portals and online forms. The target is pre-set to 400 KB; the tool tells you the final size, and nothing is uploaded.

How to use this tool

  1. Add your PDF — Drop the PDF you need to upload.
  2. Target is set to 400 KB — The target size is already 400 KB. Change it if your portal asks for something else.
  3. Download — Press Process – the result shows the final size so you can confirm it is under 400 KB.

Why ToolsTier

  • Exact target size — No guessing with presets – aim directly for 400 KB.
  • Text stays sharp — Only images are resampled; text and vector graphics remain crisp.
  • Private — Ideal for ID proofs and certificates – files never leave your device.
  • Free — No sign-up, no watermark, no limits.

When do you need a PDF under 400 KB?

400 KB caps are used by some application portals and e-filing systems.

How much fits in 400 KB?

Roughly five to ten scanned pages. The exact number depends on how many images the PDF contains and whether they are in colour.

Tips if the PDF will not go below 400 KB

Medium-length scans fit comfortably; colour photos may need the Extreme preset.

Compress PDF to a specific size

Compress PDF to 50 KBCompress PDF to 100 KBCompress PDF to 150 KBCompress PDF to 200 KBCompress PDF to 300 KBCompress PDF to 500 KBCompress PDF to 1 MBCompress PDF to 2 MB

Frequently Asked Questions

How do I compress a PDF to 400 KB?

Add the PDF above – the target is already 400 KB – press Process and download the smaller file.

Will the text be readable after compressing to 400 KB?

Yes. Text and vector graphics are not compressed; only images are resampled.

Why can't my PDF reach 400 KB?

Very long or colour-photo documents may not fit. Enable grayscale, remove unneeded pages with Organize PDF, or split the file with Split PDF.

Is my file uploaded?

No. Compression runs entirely in your browser.

Can I compress several PDFs to 400 KB at once?

Yes. Add multiple files and download them all in one ZIP.

Related tools

Split PDFOrganize PDF

Zero-Upload Privacy

Your files never leave your device or browser

Blazing Speed

Powered by modern WebAssembly & hardware-accelerated Canvas

Batch & Folder Support

Upload entire folders with subdirectories and export compressed ZIP