Compress Signature to 50KB.
Free and private — reduce your signature photo to 50KB 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 50KB JPG without uploading it anywhere. That matches the 10–50KB 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 50KB for a signature?
A 50KB 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 50KB, 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 50KB file-size limit without requiring you to guess the correct quality percentage.
2026 exam specs: UPSC CSE asks for a 20–100KB JPG signature — targeting 50KB sits safely in the middle of the range with clean, legible quality. SSC and IBPS instead want 10–20KB; use the Signature to 20KB page for those forms. 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 50KB.
- 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 50KB 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 50KB 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 50KB?
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Select a JPG, PNG, or WebP signature image using the tool above. The target is pre-set to 50KB. ToolKB will process the image directly on your device and output a compressed JPEG that targets the 50KB limit.
How do I resize my signature for SSC to 10KB-50KB?
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SSC forms (CGL, CHSL, GD, JHT) require the signature as a JPG between 10KB and 50KB. Upload your scanned signature to the tool above — the target is pre-set to 50KB, 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.
Which signature size do SSC, IBPS, and UPSC want?
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SSC and IBPS specify 10–20KB for the scanned signature (use the Signature to 20KB page). UPSC CSE allows 20–100KB, so this 50KB target works for UPSC. Always double-check your notification, since specs change each cycle.
Why is my signature rejected in an exam form?
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The three usual causes: the file is outside the required KB range, it is not a JPG, or the dimensions look wrong. Fix the file size with this tool, confirm the format is JPG, and crop the image tight around the ink before uploading.
Will a 50KB signature still be readable?
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Yes. 50KB is generous for a signature — simple ink strokes on a light background stay sharp and legible at this size, 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 50KB 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 50KB is unreachable?
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50KB is almost always reachable for a signature. If the tool struggles, your source likely has huge dimensions or heavy background clutter — crop the image first to remove empty space around the ink.
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