Resize Your Signature Online
Fit your signature to any size — 300×100 to 1000×300 px — and squeeze it under common file limits like 20 or 50 KB. All in your browser.
No uploads. No servers. 100% private browser-based signature resizing.
By Vizo ToolLast updated July 20264 min read
Resize a Signature Online — Fit Any Size & File Limit
The Signature Resizer fits your signature to the exact pixel size and file-size limit your application needs. Choose a preset like 500×200 or 1000×300 px, then squeeze the file under common e-signature limits — 20 KB, 50 KB, or 100 KB — automatically.
Because signatures are almost always transparent PNGs, the tool preserves transparency by default so your signature layers cleanly onto any document. Everything runs in your browser using the Canvas API, so your signature never leaves your device.
- 5 size presets + custom
- 20 / 50 / 100 KB limits
- Keeps transparency
- PNG & JPG export
- 100% browser-based
Why Use Signature Resizer?
Exact Size Presets
300×100 up to 1000×300 px with one click — the sizes most signature platforms accept.
File-Size Limits Built In
Auto-shrink your signature to 20 KB, 50 KB, or 100 KB for platforms with upload caps.
Transparency Preserved
PNG export keeps your signature's transparent background for clean document layering.
100% Private
Your signature is processed locally in your browser — nothing is ever uploaded.
Features
Signature Size Presets
300×100, 400×150, 500×200, 800×250, and 1000×300 px — plus custom dimensions.
Target KB Compression
Hit 20 KB, 50 KB, 100 KB, or 200 KB limits by adjusting quality and resolution automatically.
Transparent PNG Export
Signatures keep their transparency so they layer cleanly onto contracts and PDFs.
White-Background JPG
For platforms that need a solid background, export a clean JPG with a white fill.
Live Preview
See your resized signature at its exact output size, with transparency visible.
HEIC Support
iPhone HEIC photos are decoded automatically before resizing.
How to Resize a Signature
Fit your signature to any size and file limit in three simple steps.
Upload your signature
Drag and drop, browse, or paste your signature image — PNG, JPG, WEBP, or HEIC.
Pick size & limit
Choose a size preset like 500×200 px and a file limit like 20 KB or 50 KB. Pick PNG to keep transparency.
Download
Your resized, size-limited signature downloads instantly — generated entirely in your browser.
Frequently Asked Questions
Got questions? We've got answers.
How do I resize a signature online?▼
Upload your signature, choose a size preset (or set a file limit like 20 KB or 50 KB), pick PNG to keep transparency or JPG for a white background, and download. It all happens in your browser.
What size should a signature image be?▼
Most platforms accept signatures around 500×200 px or 800×250 px at 150–300 DPI. The tool's presets cover the most common sizes, and larger options exist for print-quality documents.
How do I make a signature under 20 KB?▼
Select the 20 KB limit and the tool automatically lowers the JPG quality — or shrinks the resolution — until the exported file fits. Clean, simple signatures usually compress below 20 KB easily.
How do I make a signature under 50 KB?▼
Select the 50 KB limit. The tool iterates quality and resolution automatically until the file fits the limit, so you never have to fiddle with sliders.
Will my signature keep its transparent background?▼
Yes — as long as you export as PNG. Transparent PNGs layer cleanly onto contracts and PDFs. JPG doesn't support transparency, so it fills white instead.
Is the signature resizer free?▼
Yes, it's completely free with no sign-ups, no watermarks, and no usage limits.
Are my signatures uploaded to a server?▼
No. All processing happens locally in your browser using the Canvas API — your signature never leaves your device.
What formats can I download?▼
PNG (with transparency) and JPG (with a white background). WEBP and HEIC signatures are supported as input and converted automatically.
Why is my signature file still larger than the limit?▼
Very complex signatures (lots of detail or color) can't always reach tiny limits like 20 KB. The tool gets as close as possible by lowering quality and resolution.
Can I resize a signature I drew on my phone?▼
Yes. Upload the image from your phone — including iPhone HEIC files, which are decoded automatically — and resize it to any preset.
Does the tool work on mobile?▼
Yes, the tool is fully responsive and works on desktop, tablet, and mobile browsers.
Can I use the resized signature in PDF documents?▼
Yes. Export a transparent PNG and insert it into any document or PDF — it will layer cleanly over the page.
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