Thumb impression
compressor.
Turn a thumb-print photo or scan into a JPG under 20 KB for application forms. Change to 50 KB in one tap.
Output: JPG under 20 KB — change it after upload
Drop images here or browse files
Paste Ctrl+V to compress screenshots instantly
Too large for your browser
We can compress it on our server instead. This one file will be uploaded, processed, and immediately discarded — it's never stored.
# File size tools
Compress a thumb impression without losing the ridges
Several recruitment and bank forms ask for a scan of your left-thumb impression as a small JPG — commonly in the 20–50 KB range. The print is high-contrast fine detail, which is easy to ruin with careless compression.
The tool keeps contrast as high as the size limit allows by choosing the best quality under your target and scaling gently when needed. Your fingerprint image is processed on your own device — it is never uploaded anywhere.
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High-contrast output
Quality is maximised under the limit so ridge lines stay distinct.
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20 KB or 50 KB
Switch between the two most common limits instantly.
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Biometric data stays local
A fingerprint is sensitive — nothing about this image leaves your browser.
How to prepare a thumb impression image
- 1
Press your thumb on an ink pad, roll it onto plain white paper once, and let it dry.
- 2
Photograph or scan it in good light, then crop closely around the print.
- 3
Drop the image above — a JPG under 20 KB is made. Choose 50 KB in “Max size” if the form allows it.
Typical thumb impression requirements
| File format | JPG / JPEG |
|---|---|
| File size (many forms) | About 20–50 KB |
| Paper | Plain white, ink print dried before scanning |
| Framing | Tight crop around the print |
Limits differ between exams and change between years — always follow the exact size, dimensions and format in your official notification.
# FAQ
Thumb Impression Compressor: common questions
How do I compress a thumb impression to 20KB?
Crop the print, drop it in the box above, and a JPG under 20 KB is created automatically.
The ridges look blurry — what can I do?
Retake the photo with stronger ink and even light, crop tighter, and raise the limit to 50 KB if the form allows it.
Is my fingerprint uploaded to a server?
No. Compression happens entirely in your browser, on your device.
Can I do photo, signature and thumb together?
Yes, but they usually have different limits. Use the passport photo and signature pages for those, and this one for the thumb print.