Photo Compressor for Android and iPhone: Compress Image Size

A photo compressor on your phone lets you pick the size you need and get a smaller copy of the photo, with the original left intact. ResizePing is a photo compressor for Android and iPhone: set a target size in KB or MB and read the projected size before you save. Never uploaded to our servers.

To compress image size on Android or iPhone, you have three practical levers: lower compression quality, reduce pixel dimensions, or convert the file format. Lowering compression quality discards subtle color details while preserving overall appearance. Reducing pixel dimensions shrinks width and height so fewer pixels are stored. Switching formats (such as converting a heavy PNG into a JPG or WebP) packages image data into fewer bytes. The quickest path to get an image under a specific file size limit on your phone is to set a target size in KB or MB using ResizePing, which calculates the compression for you and shows a projected file size before you save.

Quick way: set a target file size

When an online form or portal requires an image under a strict limit, manual trial and error wastes time. Setting a target file size directly solves this: specify the size you need in kilobytes (KB) or megabytes (MB), and ResizePing handles the compression on your phone.

Follow these steps on Android or iPhone:

Open ResizePing and select the photo from your library.
Choose Target size mode.
Enter your target file size in KB or MB (such as 100 KB, 200 KB, or 2 MB), or pick a preset like 100 KB.
Choose your output format: JPG, PNG, or WEBP.
Leave Strip metadata enabled to remove extra camera details.
Check the Projected size on screen before running.
Tap Run to compress the photo. Android saves to Pictures/ResizePing; iPhone saves it to Photos.

The comparison screen displays before and after file sizes, and completed runs are logged in History.

Need a smaller photo? ResizePing compresses photos to a size in KB or MB on iPhone and Android. Get it on Google Play or the App Store.

What actually makes an image smaller

Three technical levers control the file size of any digital photo:

Compression quality: Lossy formats like JPEG reduce file weight by discarding subtle color details human eyes do not readily notice. High-contrast shapes stay sharp, but setting quality too low causes block artifacts and banding.
Pixel dimensions: Resolution is measured in pixels. Phone cameras capture millions of pixels. Scaling dimensions down—such as reducing a large photo to 1080 pixels wide—removes excess pixels entirely, making it the most reliable way to reach strict file caps.
File format: File encoding affects weight. PNG is a lossless format for graphics; saving photos as PNG creates heavy files. JPG is a lossy format for photos that balances compact size with clarity. WEBP is a modern web container that often yields smaller files than JPG at similar quality.

Compress to a specific size

To resize an image in KB, pick the guide that matches your portal's limit. Many portals enforce exact file size caps. To hit a specific upload threshold, see our step-by-step guides:

How to Reduce Photo Size to 100 KB: For portals that specify a 100 KB limit; check your application's requirements.
How to Compress an Image to 200 KB for Visa and Portal Uploads: For portals that specify a 200 KB limit; check your application's requirements.
Resize an Image to 150 KB on Android or iPhone: For forms that specify a 150 KB limit.
Resize an Image to 300 KB on Android or iPhone: For forms that specify a 300 KB limit.
How to Compress an iPhone Photo to 500 KB: For uploads that specify a 500 KB limit.
How to Reduce a Photo to 2 MB for an Online Application: For uploads that specify a 2 MB limit.
Resize an Image to 10 KB on Android or iPhone: For forms that specify a 10 KB limit.
Resize an Image to 20 KB on Android or iPhone: For forms that specify a 20 KB limit.
Resize an Image to 50 KB on Android or iPhone: For forms that specify a 50 KB limit.
How to Resize a Photo to 30 KB for an Exam or Job Form: For forms that specify a 30 KB limit.
How to Resize a Photo to 15 KB for a Form Upload: For forms that specify a 15 KB limit.
How to Compress a Signature Image to 20 KB for Online Forms: For forms that specify a 20 KB limit for a signature image.

Compress many photos at once

Compressing photos individually is slow when preparing multiple attachments. ResizePing provides batch compression on Android and iPhone:

Open the app and select multiple photos using the system photo picker.
Choose your compression mode: Target size, Dimensions, or Percent.
Select your output format and metadata options.
Tap Run to process the batch. The app shows per-item progress, and you can cancel at any time.

Files save directly to device storage. See batch resize images on Android and iPhone for the complete walkthrough, or how to shrink a batch of iPhone photos for email for an email guide.

Common mistakes

Avoiding these three pitfalls will keep your images clear and prevent upload rejections:

Compressing a screenshot of a photo: Screenshots usually save as PNG files, which can be heavier than the original compressed JPG. They also capture screen borders and reduce resolution. Always compress the original image file directly.
Resizing twice: Compressing an image that has already been compressed causes cascading quality loss. Each lossy pass discards data, magnifying blur and artifacts. If a compressed file is still too large, return to the original photo and compress from the source.
Upscaling: Increasing pixel dimensions or DPI does not add real detail. Upscaling only duplicates pixels, bloating file size while leaving the picture soft.

Frequently asked questions

How do I compress image size on my phone without losing visual quality?

Reduce pixel dimensions before applying heavy compression. Phone cameras capture photos far larger than needed for screens or forms. Scaling dimensions down eliminates excess pixels while keeping the photo sharp, allowing efficient compression with minimal visual loss.

Will compressing an image delete or overwrite my original photo?

No. Compressing a photo in ResizePing creates a new copy and leaves the original picture intact in your gallery. On Android, files save to Pictures/ResizePing; on iPhone, they save to Photos alongside the original.

What should I do if an image cannot reach my target size?

When an image has dense detail, lossy compression cannot reduce file size further without changing dimensions. If ResizePing warns that the target cannot be reached, switch to Dimensions or Percent mode, lower the resolution, and run target size compression again.

What is the best photo compressor for my phone?

Choose one that lets you set the size you need and shows the result before you save. ResizePing does both: pick Target size, type the KB or MB you need and read Projected size, then tap Run.

How do I reduce photo size in KB on my phone?

Open ResizePing, set Mode to Target size, type the size you need in Target (KB), read the Projected size and tap Run. Then check the size of the result before you upload. Each common limit has its own guide above, from 10 KB to 500 KB.