How to Compress Images for Signature Uploads on Android
Android phones can compress images right in the browser. Signature images are simple black-on-white marks, so they can be very small while staying perfectly legible.
Recommended settings for signature uploads
| Setting | Starting point |
|---|---|
| Format | JPEG (WebP where accepted) |
| Width | about 300 px on the long edge |
| Quality | 60 |
| File size | 20 KB or less |
These are practical defaults. If the platform or form you are using publishes its own limits, follow those instead.
How to Compress Images
Open Chrome, load TheCompressJPEG, and tap the file picker to choose images from your gallery or file manager.
Pick a maximum width of 300 pixels or a target of 20 KB, then tap Compress and Download. The files land in your Downloads folder, ready for signature uploads.
Step by step with TheCompressJPEG
- Open the compress JPEG to 20 KB tool, or the main compressor for custom settings.
- Drop in your image. Nothing is uploaded; it is processed in your browser.
- Set the maximum width to 300 and the target size to 20 KB.
- Press Compress, check the result and download it.
Quick tips
- Check the result on a phone, where most people will see it.
- Use consistent dimensions for a set of related images.
- Resize before you compress; it improves quality at any file size.
- Write a size limit slightly below the stated maximum to leave a margin.
FAQ
What JPEG quality should I use for e-learning courses?
Quality around 78 keeps photos looking natural while cutting file size substantially.
Will compressing reduce image quality for e-learning courses?
Some detail is removed, but at sensible settings the difference is not visible at normal viewing size.
How do I compress many images for e-learning courses at once?
Drop all of them into the tool together and use Download all to get a single ZIP.
Wrapping up
For signature uploads, the reliable recipe is simple: resize to around 300 pixels, compress at quality 60 or to a 20 KB target, and check the result before you upload. Keep the original so you can always start again.
Related guides
- How to Compress Images for Signature Uploads on Windows
On Windows, a browser-based compressor avoids installing extra software.
- How to Compress Images for Signature Uploads on Mac
Mac users can compress JPEGs without opening Preview or Photoshop.
- How to Compress Images for Signature Uploads Without Losing Quality
Strictly speaking, JPEG compression always discards something, but you can make the loss invisible.
- Batch Compressing Photos for Signature Uploads
When you have dozens of images, consistency matters as much as size.
- How to Compress Images for Slack Messages on Windows
On Windows, a browser-based compressor avoids installing extra software.
- How to Compress Images for Cloud Backups Without Losing Quality
Strictly speaking, JPEG compression always discards something, but you can make the loss invisible.