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Compress PDF to 50 KB on Android and iPhone

Form wants a PDF at 50 KB? On Android, ResizePing Pro lets you type 50 KB. Free, pick Smallest and check the estimate before you save.

Published October 23, 2026 · Last updated October 27, 2026

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ResizePing Compress Complete screen showing a sample PDF before and after size

To compress a PDF to 50 KB on Android, open it in ResizePing and type the size you want. The exact-size target is a Pro feature. Without Pro, choose the Smallest level, read the estimated size and compress. On iPhone, ResizePing compresses with the same three levels.

Need a smaller PDF? ResizePing compresses PDFs on your phone. Get it on Google Play or the App Store.

Steps

The screenshot is from Android.

  1. Install ResizePing, tap Select PDF, and pick the PDF.
  2. In What do you want to do?, choose Compress PDF.
  3. Android with Pro: choose Custom size, enter 50 and pick KB.
  4. Free, Android or iPhone: under Compression level, pick Smallest. Balanced and Best quality keep more detail and give bigger files.
  5. Check Estimated output before you save.
  6. Tap Compress. The Compress Complete screen shows the size before and after.

If it won't go that small

A 50 KB PDF is very small, so a scanned PDF of full-page photos usually can't reach it. If the size you typed is lower than the PDF can reach, ResizePing says so and shows the smallest size it can get.

  • Split the PDF so you keep only the pages the form needs, then compress again.
  • Re-scan at a lower resolution, then compress the new file.

What to know

  • Never uploaded to our servers.
  • The sizes in the screenshot are for a sample file. Results depend on what is inside your PDF.

FAQ

  • How do I compress a PDF to 50 KB? On Android, open the PDF in ResizePing, choose Compress PDF, pick Custom size, enter 50 and choose KB. That target is a Pro feature. Free, use the compression levels and check the estimated size.
  • Can any PDF get to 50 KB? No. A 50 KB PDF is very small. A PDF that is mostly text can get close, but a scan made of full-page photos usually can't.
  • Can I type a target size on iPhone? On iPhone, compress with the Smallest, Balanced or Best quality levels and check the estimate.
  • Is the custom size free? No, it is a Pro feature. The compression levels are free.
  • Does it upload my PDF? No. Never uploaded to our servers.