DrawStampUtils Review: The 1.5k-Star JS Stamp Drawing Library for Browser-Generated Seals

Enterprise app developers have all encountered this requirement: the system needs an e-signature feature. When users submit a contract or approval form, an electronic seal with the company name should be automatically stamped on it.

The most common approach is having designers create a set of stamp images, with different images for different companies. But here’s the problem — every new client needs new images, and seal information like company name and number is dynamic. Static images simply can’t handle this.

DrawStampUtils solves exactly this. 1.5k stars, written in TypeScript, pure frontend Canvas-based stamp drawing. No designer needed — one line of code generates a decent-looking official seal.

What problem does it solve

One core thing: generate various seal styles with code in the browser.

Specific scenarios:

• Electronic contract systems need dynamically generated seals with company names
• Internal approval workflows need automatic stamping upon approval
• Demo systems need realistic seal effects
• Batch generation of seal samples for different companies with different numbers

The benefit of code generation is obvious: company name, number, validity period — all dynamic inputs. New clients don’t need redesigns. One codebase serves all scenarios.

Core features

Circular official seal The most common seal style — circular outer border, five-pointed star in the center, company name wrapping the outer ring. Supports customization:

• Outer ring company name text (auto circular arrangement)
• Center star size and color
• Bottom number or horizontal line
• Border thickness and color
• Text font and size

I tried a seal for “Beijing Some Technology Co., Ltd.” and the circular text arrangement looked natural. Font size auto-adjusts based on text length so nothing overflows.

Oval seal Oval-shaped seals for specific scenarios. Configurable major and minor axis ratios, text arranged along the oval path. Suitable for financial stamps, contract seals, and similar styles.

Square seal Simple square border seal with customizable interior text. Good for functional stamps like “VOID”, “APPROVED”, or “COPY INVALID”.

Detail control

• Aging effects: Add noise, scratches, blur for a less “freshly printed” look
• Color adjustment: Red, blue, purple, and other common seal colors
• Border styles: Solid, double-line, dotted, and more
• Text compression: Long company names auto-compress character spacing to fit within the ring

Export formats Generated results can export directly as:

• Canvas (direct frontend display)
• PNG image (downloadable)
• SVG vector (infinite scaling without loss)
• Base64 string (embed directly in HTML/CSS)

Quick start

import { DrawStampUtils } from 'drawstamputils';

// Create stamp instance
const stamp = new DrawStampUtils({
  canvas: document.getElementById('stamp-canvas'),
  width: 300,
  height: 300
});

// Draw circular official seal
stamp.drawCircleStamp({
  companyName: 'Beijing Some Technology Co., Ltd.',
  code: '110108012345678',
  color: '#ff0000',
  fontSize: 14,
  borderWidth: 2,
  starSize: 30,
  showNoise: true  // Add aging effect
});

// Export PNG
const pngData = stamp.toPNG();
// Export SVG
const svgData = stamp.toSVG();

npm install:

npm install drawstamputils

Tech stack:

• TypeScript
• Canvas 2D API
• Zero third-party dependencies

The good and the bad

What I loved:

• Pure frontend implementation, no backend needed, fast response
• Good TypeScript support with complete type definitions
• Zero dependencies, low integration cost
• Seal effects are realistic, circular text handling is natural
• Supports aging effects so generated seals don’t look obviously fake
• Rich export formats: Canvas/PNG/SVG/Base64
• Open source and free, can be customized as needed

What frustrated me:

• Font rendering depends on system fonts, display may vary across platforms
• Complex seal styles (like official seals with national emblems) not supported
• Aging effect parameters are limited, can’t fine-tune
• Chinese long company name auto-layout occasionally has minor issues; very long names get squeezed
• No built-in seal validity checks (like number format validation)
• Documentation is simple, advanced usage requires reading source code
• Project maintenance frequency is moderate, issue response isn’t fast

Compared to alternatives

Solution	Pros	Cons	Best for
DrawStampUtils	Pure frontend, no deps, lightweight	Limited styles	Simple e-seals
Designer images	Best quality, most professional	High cost, inflexible	Formal legal docs
Backend gen (PIL)	More powerful, font control	Needs server resources	High concurrency
Third-party services	Compliant, legally binding	Paid, data to cloud	Formal e-signing

DrawStampUtils has a clear positioning: lightweight pure frontend seal generation for internal systems where legal validity requirements aren’t strict but visual quality matters.

For formal legal document signing, use legally binding third-party e-signature services. But for internal approvals, demo environments, and informal documents, DrawStampUtils is perfectly adequate and much cheaper.

Bottom line

1.5k stars is decent for such a niche tool. DrawStampUtils solves a very specific problem: letting frontend developers generate realistic seal effects in the browser.

It’s not professional design software, nor a compliant e-signature solution. It’s a developer-friendly code library that solves the common but often overlooked need for “dynamic seal generation” with minimal cost.

For projects needing e-seal functionality with limited budgets and no strict legal requirements, DrawStampUtils is a cost-effective choice. A few lines of code generate a decent-looking seal, saving the trouble of finding designers, creating assets, and maintaining multiple templates.

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About the Author

Liudingyu is a full-stack developer and heavy GitHub user. With 900+ starred repos over the past 3 years, this site only covers tools I’ve actually used or deeply researched.

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