Privacy Tips When Compressing Images for Signature Uploads
Many online compressors upload your images to a server. That is not always necessary. 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.
Privacy Tips When Compressing Images
TheCompressJPEG processes images in your browser. Nothing is sent anywhere, which matters for IDs, documents and family photos.
Before sharing images for signature uploads, also check the picture itself: addresses, licence plates and documents in the background can reveal more than you intend.
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
- Use WebP where it is supported and you control the page.
- Never re-compress an already compressed JPEG if you can avoid it.
- Strip metadata from images you share publicly.
- Always keep the original file and compress a copy.
FAQ
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.
What JPEG quality should I use for e-learning courses?
Quality around 78 keeps photos looking natural while cutting file size substantially.
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
- Understanding KB and MB When Preparing Images for Signature Uploads
Size limits are written in kilobytes and megabytes, and the units trip people up.
- Aspect Ratios to Use for Signature Uploads
Aspect ratio is the shape of the image, and the wrong one leads to awkward crops.
- Converting HEIC to JPEG for Signature Uploads
iPhones save photos as HEIC by default, and not every site accepts it.
- Upload Errors and File Size Limits for Signature Uploads
An upload error is frustrating when the message is vague.
- Understanding KB and MB When Preparing Images for Slack Messages
Size limits are written in kilobytes and megabytes, and the units trip people up.
- Converting HEIC to JPEG for Cloud Backups
iPhones save photos as HEIC by default, and not every site accepts it.