Compress Image to 20KB

1. 1

   Scan or photograph your signature on white paper, then upload the image to SizeSnap.

2. 2

   Enter 20 as the target size and select KB as the unit.

3. 3

   Press Compress. SizeSnap finds the optimal quality setting that keeps the file at or just below 20KB.

4. 4

   Download your compressed signature and upload it to your exam registration or government form.

A 20KB file-size limit represents one of the most extreme constraints you will encounter, and it is almost always tied to signature image uploads and highly restrictive government forms. Indian competitive-exam portals are the most prominent source: UPSC (Union Public Service Commission) Civil Services, NDA, and CDS applications require scanned signatures under 20KB. The SSC (Staff Selection Commission), IBPS banking exams, JEE Advanced, NEET-UG, and numerous state PSC (Public Service Commission) platforms all enforce signature limits between 10KB and 20KB. Similarly, the Income Tax Department's e-filing portal asks for a signature image under 20KB when registering a Digital Signature Certificate. These limits exist because signature fields are stored as small binary blobs in legacy database schemas designed decades ago. The images are displayed at tiny dimensions — often 140x60 pixels or smaller — so the portal does not need or want a large file. The challenge is that scanning a physical signature at even moderate resolution (150-200 DPI) easily produces a 100-500KB file. Without a precise compression tool, users resort to repeatedly lowering quality in paint programs or online editors, often ending up with a blurry, illegible result. SizeSnap solves this by targeting exactly 20KB while preserving the clean strokes that make a signature legally recognizable.

• Sign with a dark pen on clean white paper for maximum contrast — this compresses far more efficiently than a light pencil signature on textured paper.

• Crop tightly around the signature with minimal white space. Every extra pixel of background wastes bytes that could preserve stroke clarity.

• Convert to grayscale before compressing — a signature does not need color data, and removing it can cut file size by 30-60%.

• If the portal specifies exact pixel dimensions (e.g., 140x60), resize to those dimensions before compressing. SizeSnap will then allocate the entire 20KB budget to quality rather than resolution.

Is compressing to 20KB free?

Yes, SizeSnap is free for up to 3 compressions per day. No account needed.

Does SizeSnap work on mobile?

Yes, SizeSnap runs entirely in your browser and works on any device — iPhone, Android, tablet, or desktop.

Will my image lose quality when compressed to 20KB?

SizeSnap uses smart compression that minimizes visible quality loss. For 20KB, some quality loss is expected, but SizeSnap optimizes to keep the image looking good at this size.

What image formats are supported?

SizeSnap supports JPEG, PNG, WebP, and HEIC images. All formats can be compressed to exactly 20KB.