PPing Apps Lab
Guides·ResizePing

Resize an Image to 20 KB or 50 KB on Android or iPhone

Form wants a photo under 20 KB or 50 KB? Type your own target in ResizePing on Android or iPhone, check the projected size, and lower the resolution if it can't get there.

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

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An upload form says the photo must be under 20 KB or 50 KB, and yours is a few megabytes. ResizePing lets you type your own target in KB on Android and iPhone, shows a projected size before you save, and tells you when a target can't be reached.

Need a photo at this size? ResizePing resizes photos to exact dimensions or a file size on iPhone and Android. Get it on Google Play or the App Store.

Steps

ResizePing on Android with Target size mode selected, a Target (KB) field and projected sizes for photos before Run
Android: Target size mode with the Target (KB) field. This capture shows 100; type your own number, for example 20 or 50.
ResizePing on iPhone with Target size mode selected, a Target (KB) field and projected sizes for photos before Run
iPhone: the same Target (KB) field. This capture shows 100; type your own number, for example 50.
  1. Open ResizePing and pick the photo or photos you want to shrink.
  2. Set Mode to Target size.
  3. In Target (KB), type 20 or 50. Any whole number above 0 works; anything else shows "Enter a number".
  4. Pick the format the form asks for: JPG, PNG or WEBP. Leave Strip metadata on unless the form says otherwise.
  5. Read the Projected size for each photo before you run.
  6. Tap Run, then check the result size before you upload.

Never uploaded to our servers.

Which size do you need?

If 20 KB is too small for the photo

Very small targets on big photos may not be reachable. When that happens ResizePing says "Can't get this under 20 KB. Try a larger size or lower resolution." and the projected size shows the smallest it can reach. If a finished result still misses, it shows "Couldn't reach 20 KB — this is the smallest possible".

Lower the resolution first, then try the target again:

  1. Switch Mode to Dimensions or Percent and make the photo smaller.
  2. Run it, then open the smaller result and set Target size to 20 or 50.
  3. If the form allows a bit more room, try 50 KB instead of 20 KB.

A photo that is already small shows "Already under 20 KB", so there is nothing to do.

What to know

  • ResizePing works on photos. It does not have signature, ID or face modes, and it does not change backgrounds.
  • The projected size is an estimate, so read the real size of the result before you upload.
  • The same Target size mode handles other numbers too. For the 100 KB case, see How to Reduce Photo Size to 100 KB on iPhone and Android.

FAQ

How do I resize an image to 20 KB on Android?

Open ResizePing, choose Target size, type 20 in Target (KB) and read the projected size. If it can't reach 20 KB it says so; lower the resolution with Dimensions or Percent and try again.

How do I resize an image to 50 KB?

See the standalone guide: Resize an Image to 50 KB on Android or iPhone. In short, set Target size and type 50 in Target (KB).

Will every photo get under 20 KB?

No. Very small targets on big photos may not be reachable. ResizePing tells you when a target can't be reached and shows the smallest size it can get to.

Can I pick my own number, not just the presets?

Yes. Type any whole number above 0 in Target (KB). The presets are 100 KB, 1 MB or under, Web 1080 px wide, and Passport photo 35 × 45 mm.

Does it upload my photo?

No. Never uploaded to our servers.

On a computer

On a computer instead? Ping Tools Lab has browser versions: Resize Image to 20 KB and Resize Image to 50 KB.