Compress Signature to 20KB.
Free and private — reduce your signature photo to 20KB in your browser. No sign-up, no upload.
Quick answer: ToolKB's signature compressor is a free browser-based tool that shrinks your scanned signature to exactly 20KB JPG without uploading it anywhere. That matches the 10–20KB signature requirement on SSC and IBPS application forms.
Select or Drop Images
Drop photo, signature, or up to 5 files at once. 100% in-browser, zero server uploads.
Why 20KB for a signature?
A 20KB limit for an image upload is very small, but it is often required by online submission forms. Fortunately, a signature is conceptually simple (dark ink on white paper). At 20KB, the ink strokes generally remain sharp and easily legible, as long as the original photo was well-lit and had a plain background.
This tool automatically adjusts the JPEG compression level to target the 20KB file-size limit without requiring you to guess the correct quality percentage.
2026 exam specs: SSC CGL, CHSL, GD and JHT ask for a 10–20KB JPG signature (about 6.0×2.0 cm), and IBPS PO/Clerk asks for 10–20KB (about 140×60 px). Targeting exactly 20KB keeps you at the top of the allowed range — the best quality that still passes every form. Full list: India photo size requirements.
Get a clean scan before compressing
- Sign in black ink on plain white paper and photograph or scan it in good light.
- Crop away empty margins with ToolKB's Crop Image tool.
- Upload the signature above — the target is pre-set to 20KB.
- ToolKB compresses it in your browser; nothing is uploaded.
- Download the JPG and upload it to your form.
Private browser processing
Signatures are sensitive personal data. ToolKB never uploads your file to any server. The entire compression process runs locally inside your web browser using standard web technologies.
What if 20KB is unreachable?
If your original photo has extremely large pixel dimensions or contains a lot of visual complexity (like shadows, lined paper, or large margins), the tool might report that 20KB is unreachable while maintaining safe quality constraints.
If this happens, you should use the Crop Image tool to remove the empty space around the signature. Reducing the physical dimensions of the image significantly reduces the amount of data that needs to be compressed.
Frequently Asked Questions
How do I compress my signature to 20KB?
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Select a JPG, PNG, or WebP signature image using the tool above. The target is pre-set to 20KB. ToolKB will process the image directly on your device and output a compressed JPEG that targets the 20KB limit.
How do I resize my signature for SSC to 10KB-20KB?
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SSC forms (CGL, CHSL, GD, JHT) require the signature as a JPG between 10KB and 20KB. Upload your scanned signature to the tool above — the target is pre-set to 20KB, which sits at the top of the allowed range for the best quality that still passes. Sign in black ink on plain white paper, crop away empty margins first, and download the result.
Does the 20KB limit apply to both SSC and IBPS?
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Yes. Both SSC (CGL, CHSL, GD, JHT) and IBPS (PO, Clerk) specify a 10–20KB JPG for the scanned signature in their 2026 notifications. IBPS additionally wants roughly 140×60 pixels. One 20KB file works for both.
Why is my signature rejected in the SSC form?
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The three usual causes: the file is outside the 10–20KB range, it is not a JPG, or the dimensions/aspect ratio look wrong (SSC expects roughly 6.0×2.0 cm). Fix the file size with this tool, confirm the format is JPG, and crop the image tight around the ink before uploading.
Will a 20KB signature still be readable?
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Yes, in most cases. Because a signature consists of simple ink strokes on a light background, 20KB is typically enough data to keep the ink clear and legible, provided the original photo was well-lit.
Are my signature images uploaded to a server?
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No. Your signature is processed locally within your web browser. It is never uploaded or saved to a ToolKB server.
What format will the 20KB signature be?
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The tool accepts JPG, PNG, and WebP formats, but the output file you download will always be a standard JPEG.
What if the tool says 20KB is unreachable?
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If your source image has very large dimensions or a lot of background clutter, 20KB might be too small to reach through compression alone. You should try cropping the image first to remove unnecessary background space.
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