Free, Fast, and Secure
How to Compress PDF to 400KB Online Free
Step: 01
Upload a PDF from your computer, choose a file, or drag and drop it.
Step: 02
Hit the “Compress PDF” button to compress the PDF to 400 KB.
Step: 03
Press “Download Compressed PDF” to save the file to your device.
PDF Compression Made Easy: Reduces Size to 400 KB
Works on:
Windows
Linux
Mac
iPhone
Android
Compress PDF
Shrink your PDF files fast with our simple and safe tool. PDFs are great for sharing and printing, but sometimes, they are too big. Our tool quickly reduces your file size so you can email, print, or share it easily.
PDF Quality
When you shrink a PDF, its quality may drop a little. Our PDF compressor keeps your file as clear as possible. We strive to maintain sharp details so the small PDF still looks good for reading and printing.
Upload from Cloud
Uploading files is simple with our tool. You can drag and drop your file or choose one from your computer or Dropbox. Our easy process lets you start working with your file quickly from anywhere you like.
Batch Compress
Compress multiple PDFs in one go, batch processing up to four files simultaneously. Streamline large or bulk compression tasks with ease, save time, and handle multiple documents without sacrificing quality.
Secure and Private
We delete your files shortly after compressing. We don’t store, share, or access your documents. We prioritize your privacy and security so you can compress files worry-free.
Exactly 400 KB?
Our advanced compression algorithm tries to shrink your PDF to exactly 400 KB every time. It works fast, keeps your document’s quality intact, and makes sharing and storing files effortless.
Frequently Asked Questions
Will text and fonts still look sharp after compression?
Yes, when your file contains mostly text, fonts are usually preserved very well, even after reducing to 400KB. Our tool uses lossless compression for text layers where possible. For best results, avoid embedding large custom fonts or background patterns.I compressed a file, but it ended up as 420KB. Why didn’t it hit 400KB exactly?
The final file size may slightly exceed 400KB depending on the original content, layout, and media. Our algorithm balances file size with readability and quality. If precise size is critical, try further reducing file size by simplifying the content or compressing again.Can I compress scanned documents or image-only PDFs to 400KB?
Yes, but results vary. Image-only or scanned PDFs (without OCR) tend to be much larger. To fit within 400KB, our tool reduces resolution and uses aggressive compression.Can I batch compress multiple PDFs to 400KB at once?
Yes, our tool supports batch compression. You can process 4 files in one go and compress each file to 400KB online for free.I need to email a form with fields—will it still work after compression?
Yes. If your PDF includes form fields or basic interactivity (like clickable links or buttons), those are preserved during standard compression.How is my privacy protected?
We take security seriously. Your file is encrypted during upload and download. After one hour, it’s automatically deleted from our servers. We don’t access, view, or store any content.Will compressing my PDF remove watermarks or digital signatures?
No. Our tool does not alter copyright information, watermarks, or digital signatures. However, overly aggressive compression may sometimes affect the visual appearance of stamps or digital seals.My file was already small—why didn’t it reduce further?
If your original file is already optimized or below 400KB, there’s little or no room for further compression. Our tool avoids unnecessary re-encoding to preserve the original quality. In such cases, the output file may be nearly the same size.My PDF has lots of colored images—can it still reach 400KB?
In most two- to three-page layouts it can. Our tool will satisfy all the realistic use cases of compressing PDF to 400KB for meeting uploads, submissions, and emails.Can I compress PDFs on mobile?
Yes, our tool is mobile-friendly. You can compress PDF files on your Android, iPhone, or iPad devices easily.