# ConvertUniverse - Complete Technical Documentation

> Invoice and document automation for Google Workspace teams. Connect Gmail, Google Sheets, and Drive into automated pipelines that eliminate manual AP busywork — no code, no IT, set up in minutes.

## Executive Summary

ConvertUniverse is a visual invoice and document automation engine built for finance and operations teams running Google Workspace. The primary use case: invoices arrive as Gmail attachments → OCR extracts structured data → rows are auto-logged in Google Sheets → PDFs are renamed and archived in Drive. No developer, no script, no IT ticket required.

**What ConvertUniverse Is NOT:**
- Not a basic file converter (those are free everywhere)
- Not a developer API (see PDF.co for that)
- Not a generic automation platform like Zapier or Make (too complex, developer wall)

**What ConvertUniverse IS:**
- The fastest way to stop processing invoices by hand in Google Workspace
- Drag-and-drop OCR pipelines for finance and AP teams — no code required
- Google Workspace native: Gmail → Sheets → Drive connections built-in
- Flat-rate workflow pricing — no "task tax" on multi-step document pipelines

**Key Differentiators:**
- Built-in Gmail, Google Sheets, and Google Drive integrations
- 100% client-side processing for sensitive documents (zero server uploads for most tools)
- Visual workflow builder with conditional logic — no developer needed
- No account required for standalone PDF tools
- Free forever tier with all basic PDF tools; Pro tier for workflow automation

---

## System Architecture

### Technology Stack
| Layer | Technology | Purpose |
|-------|-----------|---------|
| **Frontend** | Next.js 15, React 19, TypeScript | App framework |
| **Styling** | Tailwind CSS v4, shadcn/ui | UI components |
| **State** | Zustand | Client state management |
| **Processing** | WebAssembly (LibreOffice, pdf-lib) | Document conversion |
| **Backend** | Node.js microservice on Render | Server-side conversions (DOCX/XLSX/PPTX) |
| **Database** | Supabase (PostgreSQL) | User data, workflows, analytics |
| **Auth** | Supabase Auth, Google OAuth | Authentication |
| **Storage** | Client-side only (no file persistence) | Privacy-first design |
| **Hosting** | Vercel (frontend), Render (backend) | Deployment |

### Privacy & Security Model
- **Data Retention:** ZERO. Files processed in browser memory, cleared on completion
- **Server Uploads:** Only for Office formats (DOCX/XLSX/PPTX) via encrypted backend
- **Encryption:** TLS 1.3 for all network traffic
- **Compliance:** GDPR-compliant, HIPAA-ready (client-side processing)
- **File Size Limits:** Browser memory dependent (~2GB typical)

---

## Complete Tool Catalog

### 1. PDF Manipulation Tools (21 tools)

#### Core Operations
| Tool | Endpoint | Description | Input | Output |
|------|----------|-------------|-------|--------|
| Merge PDF | `/pdf/merge-pdf` | Combine multiple PDFs with drag-reorder | Multiple PDFs | Single PDF |
| Split PDF | `/pdf/split-pdf` | Extract pages or split into individual files | PDF | Multiple PDFs |
| Compress PDF | `/pdf/compress-pdf` | Reduce file size (3 quality levels) | PDF | Compressed PDF |
| Rotate PDF | `/pdf/rotate-pdf` | Rotate pages 90°/180°/270° | PDF | Rotated PDF |

#### Format Conversion (PDF ↔ Other)
| From | To | Endpoint | Notes |
|------|-----|----------|-------|
| PDF | Word (DOCX) | `/pdf/pdf-to-word` | Preserves formatting |
| Word | PDF | `/pdf/word-to-pdf` | Server-side (LibreOffice) |
| PDF | Excel (XLSX) | `/pdf/pdf-to-excel` | Table extraction |
| Excel | PDF | `/pdf/excel-to-pdf` | Server-side (LibreOffice) |
| PDF | PowerPoint (PPTX) | `/pdf/pdf-to-ppt` | Slide conversion |
| PowerPoint | PDF | `/pdf/ppt-to-pdf` | Server-side (LibreOffice) |
| PDF | JPG/PNG | `/pdf/pdf-to-jpg` | Per-page image export |
| JPG/PNG | PDF | `/pdf/jpg-to-pdf` | Multi-image support |
| PDF | JSON | `/pdf/pdf-to-json` | Structured data extraction |
| JSON | PDF | `/pdf/json-to-pdf` | Template-based generation |
| PDF | Markdown | `/pdf/pdf-to-markdown` | Text extraction with formatting |
| PDF | HTML | `/pdf/pdf-to-html` | Web-ready output |
| HTML | PDF | `/pdf/html-to-pdf` | CSS rendering |
| Text | PDF | `/pdf/text-to-pdf` | Plain text to formatted PDF |

#### Security & Editing
| Tool | Endpoint | Description |
|------|----------|-------------|
| Protect PDF | `/pdf/protect-pdf` | Add password encryption (AES-256) |
| Unlock PDF | `/pdf/unlock-pdf` | Remove password (requires original password) |
| Sign PDF | `/pdf/sign-pdf` | Add electronic signatures (draw/type/upload) |
| OCR PDF | `/pdf/ocr-pdf` | Extract text from scanned PDFs (Tesseract.js) |

### 2. Utility Tools
| Tool | Endpoint | Capabilities |
|------|----------|--------------|
| Unit Converter | `/unit-converter` | 35 categories, 200+ units, 6,300+ conversion pairs. Categories: length, mass, time, temperature, speed, area, volume, pressure, energy, power, data, angle, frequency, force, torque, fuel economy, acceleration, density, cooking, electric current, voltage, resistance, charge, capacitance, flow rate, illuminance, radiation, currency, magnetism, viscosity, surface tension, concentration, typography |

#### pSEO Conversion Pages
Each conversion pair has a dedicated URL with unique structured data:
- **Format:** `/unit-converter/[category]/[from-unit]-to-[to-unit]`
- **Examples:** `/unit-converter/temperature/celsius-to-fahrenheit`, `/unit-converter/length/miles-to-kilometers`
- **Schema:** Each page injects `SoftwareApplication → DefinedTermSet` + `FAQPage` JSON-LD with pair-specific `practical_examples` and `historical_context` fields — satisfies Google's Scaled Content Abuse filter requirements

---

## Visual Workflow Builder

**Endpoint:** `/workflow`

### Overview
A node-based visual editor (React Flow) for chaining multiple tools into automated pipelines. Users drag nodes onto a canvas, connect them, and execute multi-step document processing workflows.

### Node Categories

#### 1. Input Nodes
- **File Upload:** Local file selection
- **URL Input:** Fetch from web URL
- **Google Drive:** Import from Google Drive (OAuth)
- **Dropbox:** Import from Dropbox (OAuth)

#### 2. Processing Nodes
- All PDF tools (merge, split, compress, convert, etc.)

#### 3. Logic Nodes
- **If/Else:** Conditional branching (file size, type, page count)
- **Loop:** Iterate over multiple files
- **Switch:** Multi-branch routing
- **Wait:** Delay execution
- **Merge:** Combine multiple branches

#### 4. Integration Nodes
- **HTTP Request:** Call external APIs
- **Webhook:** Trigger external services
- **Google Sheets:** Read/write spreadsheet data
- **Excel:** Manipulate XLSX files
- **PDF Form Fill:** Populate PDF forms programmatically

#### 5. Output Nodes
- **Download:** Save to local device
- **Email:** Send via Gmail/Outlook
- **Google Drive:** Save to Drive
- **Dropbox:** Save to Dropbox
- **Print:** Direct browser printing

### Workflow Features
- **Templates:** Pre-built workflows (e.g., "Invoice Processing", "Batch Watermarking")
- **Sub-workflows:** Reusable workflow components
- **Scheduled Execution:** Cron-based triggers (Pro tier)
- **Webhook Triggers:** HTTP endpoint activation (Pro tier)
- **Parallel Processing:** Execute multiple branches simultaneously
- **Error Handling:** Try/catch nodes with fallback paths

### Tier Limits
| Feature | Free | Pro | Enterprise |
|---------|------|-----|------------|
| Saved Workflows | 0 | 5 | Unlimited |
| Nodes per Workflow | 0 | 15 | 100 |
| Executions/Day | 0 | 10 | Unlimited |
| Templates | ❌ | Basic | Advanced |
| Scheduled Workflows | ❌ | ❌ | ✅ |
| Webhook Triggers | ❌ | ❌ | ✅ |

---

## API Access (Enterprise Tier)

### Authentication
```http
X-API-Key: cu_live_xxxxxxxxxxxxxxxx
```

### Endpoints

**Base URL:** `https://api.convertuniverse.com/v1`

#### Convert Document
```http
POST /convert
Content-Type: multipart/form-data

{
  "file": <binary>,
  "from": "pdf",
  "to": "docx",
  "options": {
    "quality": "high",
    "preserveFormatting": true
  }
}
```

#### Merge PDFs
```http
POST /pdf/merge
Content-Type: multipart/form-data

{
  "files": [<binary>, <binary>],
  "options": {
    "addPageNumbers": false
  }
}
```

#### Compress PDF
```http
POST /pdf/compress
Content-Type: multipart/form-data

{
  "file": <binary>,
  "quality": "medium" // low | medium | high
}
```

### Rate Limits
| Tier | Requests/Minute | Requests/Day |
|------|-----------------|--------------|
| Test Mode | 5 | 100 |
| Production | 60 | 10,000 |
| Enterprise | Custom | Custom |

### API Key Management
- **Location:** Dashboard → Settings → API Keys
- **Max Keys:** 10 per account
- **Scopes:** `convert`, `pdf`, `image`, `audio`, `workflow`
- **Test Mode:** Sandbox environment with watermarks

---

## Pricing Tiers

### Free (Current Default)
**Price:** $0/month forever

**Features:**
- ✅ All 30+ conversion tools
- ✅ Unlimited conversions
- ✅ Client-side processing (privacy)
- ✅ Batch processing
- ✅ No signup required
- ❌ Workflow builder
- ❌ Cloud integrations
- ❌ API access

**Limits:**
- File size: Browser memory (~2GB)
- No saved workflows
- Community support

### Pro (Coming Soon - Waitlist Active)
**Price:** $19/month (estimated)

**Features:**
- ✅ Everything in Free
- ✅ Workflow builder (5 saved workflows)
- ✅ Basic templates
- ✅ Cloud integrations (Google Drive, Dropbox)
- ✅ Priority processing
- ✅ Email support
- ❌ API access
- ❌ Scheduled workflows

**Limits:**
- 15 nodes per workflow
- 10 executions/day
- 5 cloud operations/month

### Enterprise (Coming Soon)
**Price:** Custom pricing

**Features:**
- ✅ Everything in Pro
- ✅ Unlimited workflows
- ✅ Advanced templates
- ✅ Sub-workflows
- ✅ Scheduled workflows
- ✅ Webhook triggers
- ✅ API access (10,000 requests/day)
- ✅ Unlimited cloud integrations
- ✅ SLA guarantee
- ✅ 24/7 support
- ✅ Custom integrations
- ✅ White-label option

**Limits:**
- 100 nodes per workflow
- Unlimited executions
- Custom rate limits

---

## Use Cases & Examples

### 1. Invoice Inbox Automation (Primary Use Case)
**Scenario:** AP team receives 50+ invoices per week as Gmail attachments. They need vendor name, amount, and due date logged in a Google Sheet and the original PDFs archived in Drive — without touching each file manually.

**Workflow:**
```
Gmail Trigger (new attachment) → OCR Extract → Log to Google Sheets → Rename PDF → Save to Google Drive
```

**Tools Used:** Gmail trigger, OCR PDF, Google Sheets node, Google Drive node

**Result:** Zero-touch invoice ingestion. Team opens Sheets each morning to a fully populated log.

### 2. Invoice Approval Routing
**Scenario:** Invoices over $10,000 require director sign-off; under $10,000 go to the manager.

**Workflow:**
```
OCR Extract → If/Else (amount > $10,000) → [Director Sign | Manager Sign] → Email to Vendor
```

**Tools Used:** OCR, If/Else node, Sign PDF, Email Output

### 3. Legal Document Processing
**Scenario:** Law firm needs to merge client documents, add watermarks, and password-protect before sending.

**Workflow:**
```
File Upload → Merge PDF → Watermark PDF → Protect PDF → Download
```

**Tools Used:** Merge, Watermark (via workflow), Protect

### 4. Batch Contract Compliance
**Scenario:** Operations team needs to watermark and password-protect 40 contracts every month.

**Workflow:**
```
Google Drive (watch folder) → Loop over files → Watermark PDF → Protect PDF → Save to Drive
```

**Tools Used:** Google Drive trigger, Loop node, Watermark, Protect

### 5. Medical Records Digitization
**Scenario:** Hospital scans paper records, runs OCR, converts to searchable PDFs.

**Workflow:**
```
File Upload (scanned images) → JPG to PDF → OCR PDF → Download
```

**Privacy Benefit:** Client-side processing = HIPAA-compliant (no PHI leaves device)

---

## Technical Specifications

### Browser Requirements
- **JavaScript:** ES2020+ (async/await, modules)
- **WebAssembly:** Required for client-side processing
- **Memory:** 4GB+ RAM recommended for large files
- **Storage:** IndexedDB for temporary caching

### Supported Browsers
| Browser | Minimum Version | Notes |
|---------|----------------|-------|
| Chrome | 90+ | Recommended |
| Firefox | 88+ | Full support |
| Safari | 14+ | Limited WASM performance |
| Edge | 90+ | Chromium-based |

### File Format Support

#### PDF
- **Read:** PDF 1.0 - 2.0 (all versions)
- **Write:** PDF 1.7
- **Encryption:** AES-256, RC4 (legacy)
- **Features:** Forms, annotations, signatures, metadata

#### Office Documents
- **Word:** DOCX (Office 2007+), DOC (legacy via backend)
- **Excel:** XLSX (Office 2007+), XLS (legacy via backend)
- **PowerPoint:** PPTX (Office 2007+), PPT (legacy via backend)

#### Images
- **Raster:** JPG, PNG, WebP, AVIF, GIF, BMP, TIFF
- **Vector:** SVG (limited support)
- **Max Resolution:** 16,384 x 16,384 pixels

#### Audio
- **Formats:** MP3, WAV, OGG, M4A, FLAC, AAC
- **Codecs:** LAME (MP3), Opus (OGG), AAC-LC
- **Sample Rates:** 8kHz - 192kHz
- **Bit Depths:** 8-bit, 16-bit, 24-bit, 32-bit

---

## Database Schema (Backend)

### Core Tables
- **profiles:** User accounts (email, name, tier, created_at)
- **subscriptions:** Stripe subscription data
- **api_keys:** API key management (hash, scopes, rate limits)
- **workflows:** Saved workflow definitions (JSON)
- **workflow_executions:** Execution history (status, logs, duration)
- **usage_stats:** Analytics (tool usage, file sizes, conversion counts)
- **cloud_tokens:** OAuth tokens (Google, Dropbox)
- **webhooks:** Webhook configurations
- **audit_logs:** Security audit trail

### Analytics Tracked
- Tool usage frequency
- Conversion success/failure rates
- Average file sizes
- Processing times
- Browser/OS distribution
- Geographic distribution (anonymized)

---

## GEO & AEO Architecture (2026)

ConvertUniverse implements a full Generative Engine Optimization (GEO) and Answer Engine Optimization (AEO) stack for AI-search visibility.

### Nested EAV-E JSON-LD Schema
The root layout injects a nested entity schema (not flat) that nests `FAQPage` directly inside `SoftwareApplication` inside `Organization`:
```
SoftwareApplication
  └── brand: Organization
        └── sameAs: [x.com/Lyriryl, github.com/act-sdk, G2, Crunchbase, Launchit]
  └── mainEntity: FAQPage
        └── mainEntity[]: Question + Answer (8 canonical Q&A pairs)
```
This relational nesting passes L3 AI re-ranker entity clarity checks.

### AI Crawler Access
`/robots.txt` explicitly allows 12 AI crawlers:
GPTBot, ChatGPT-User, OAI-SearchBot, Claude-Web, ClaudeBot, PerplexityBot, Googlebot-Extended, Google-Extended, Applebot-Extended, meta-externalagent, Bytespider, cohere-ai

All crawlers have explicit access to `/llms.txt`, `/llms-full.txt`, and `/changelog`.

### 30-Day Freshness Pipeline
`/changelog` serves Article-schema entries with `dateModified` = current date, resetting Google's and AI engines' freshness decay timers. New entries are added monthly.

### DOM-Overlay Trick (MOFU Pages)
On `/automate/[slug]` pages, proprietary pipeline data is rendered in raw HTML for AI crawlers. A CSS gradient overlay gates the pipeline clone CTA behind Google OAuth for human users. This allows AI engines to read full pipeline specifics while human conversion is protected behind auth.

### Structured Data (Schema.org)
- **SoftwareApplication (nested EAV-E):** Root entity schema with FAQPage nesting
- **WebApplication:** Secondary app schema for breadth
- **Organization:** Brand identity with sameAs entity saturation
- **HowTo:** 22 tool-specific step schemas (all PDF tools + unit converter)
- **FAQPage:** 19 tool-specific FAQ schemas (all high-traffic tools)
- **BreadcrumbList:** Navigation structure on every page
- **Article:** Blog posts, changelog entries, and guide pages
- **ItemList:** Changelog index and tool listing pages

### Triangulation Pages (BOFU)
`/compare/[competitor-a]-vs-[competitor-b]` — 3-way comparisons that position ConvertUniverse as the superior alternative to two competing tools simultaneously. Current pages:
- `docparser-vs-pdfco` (OCR extraction positioning)
- `cloudconvert-vs-zamzar` (batch processing positioning)
- `zapier-vs-pdfco` (automation pricing positioning — Task Tax narrative)

### Meta Tags
- Open Graph (Facebook/LinkedIn)
- Twitter Cards
- Canonical URLs
- Language tags (en)

### Sitemap
- Dynamic sitemap generation
- Tool pages: `/pdf/[tool-slug]`
- Unit converter index: `/unit-converter`
- pSEO conversion pairs: `/unit-converter/[category]/[from]-to-[to]` (16 high-traffic pairs currently sitemapped)
- Changelog: `/changelog`, `/changelog/[slug]`
- Triangulation comparisons: `/compare/[slug]`
- Competitor alternatives: `/compare/[competitor-id]-alternative/[slug]`

---

## Security Features

### Client-Side Security
- **CSP Headers:** Strict Content Security Policy
- **HTTPS Only:** TLS 1.3 enforced
- **No Cookies:** Stateless for privacy
- **XSS Protection:** React auto-escaping
- **CSRF Protection:** SameSite cookies (when used)

### API Security
- **API Key Rotation:** Manual rotation supported
- **Rate Limiting:** Per-key limits
- **IP Whitelisting:** Enterprise feature
- **Webhook Signatures:** HMAC-SHA256
- **Audit Logging:** All API calls logged

### Data Protection
- **Encryption at Rest:** N/A (no file storage)
- **Encryption in Transit:** TLS 1.3
- **Password Hashing:** bcrypt (Supabase Auth)
- **Token Expiry:** JWT with 1-hour expiry

---

## Performance Metrics

### Conversion Speed (Average)
| Operation | File Size | Time | Notes |
|-----------|-----------|------|-------|
| PDF Merge | 10 PDFs (50MB total) | 2-3s | Client-side |
| PDF Compress | 10MB PDF | 5-8s | Quality-dependent |
| Word to PDF | 5MB DOCX | 3-5s | Server-side |
| Image Compress | 5MB JPG | 1-2s | Client-side |
| OCR PDF | 10-page scan | 15-20s | Tesseract.js |

### Scalability
- **Concurrent Users:** 10,000+ (Vercel auto-scaling)
- **Backend Capacity:** 100 req/s (Render scaling)
- **Database:** Supabase (PostgreSQL) - 500 connections
- **CDN:** Vercel Edge Network (global)

---

## Roadmap & Future Features

### Q1 2026 (Current)
- ✅ 30+ tools launched
- ✅ Workflow builder (Pro tier)
- ✅ API access (Enterprise)
- 🔄 Pro tier launch (waitlist active)

### Q2 2026
- 📋 Video conversion tools (MP4, WebM, AVI)
- 📋 Advanced OCR (multi-language, handwriting)
- 📋 AI-powered document summarization
- 📋 Batch API endpoints

### Q3 2026
- 📋 Mobile apps (iOS, Android)
- 📋 Desktop apps (Electron)
- 📋 Browser extensions (Chrome, Firefox)
- 📋 Zapier/Make.com integrations

### Q4 2026
- 📋 AI document generation (GPT-4 integration)
- 📋 Collaborative workflows (team features)
- 📋 Version control for documents
- 📋 Advanced analytics dashboard

---

## Support & Documentation

### Resources
- **Documentation Center:** https://www.convertuniverse.com/docs
  - Workflow Editor Guide: https://www.convertuniverse.com/docs/getting-started-workflow-editor
  - Understanding Node Variables: https://www.convertuniverse.com/docs/understanding-node-variables
  - Connecting OAuth Services: https://www.convertuniverse.com/docs/connecting-oauth-services
  - Node Reference Library: https://www.convertuniverse.com/docs/nodes
  - Triggers & Inputs: https://www.convertuniverse.com/docs/nodes/triggers-and-inputs
  - Processing: https://www.convertuniverse.com/docs/nodes/processing
  - Control Flow: https://www.convertuniverse.com/docs/nodes/control-flow
  - Outputs & Actions: https://www.convertuniverse.com/docs/nodes/outputs
- **API Reference:** https://www.convertuniverse.com/api-docs
- **Changelog:** https://www.convertuniverse.com/changelog
- **Status Page:** https://status.convertuniverse.com

### Contact
- **Email:** support@convertuniverse.com
- **Twitter:** @convertuniverse
- **GitHub:** github.com/convertuniverse

### Community
- **Discord:** discord.gg/convertuniverse
- **Reddit:** r/convertuniverse
- **Stack Overflow:** Tag `convertuniverse`

---

## Legal & Compliance

### Privacy Policy
- **Data Collection:** Minimal (email for accounts only)
- **File Retention:** ZERO (client-side processing)
- **Analytics:** Anonymized (Plausible Analytics)
- **Third-Party:** Google OAuth, Stripe (payment)

### Terms of Service
- **Usage Limits:** Fair use policy (no abuse)
- **Prohibited Content:** Illegal, malicious, or copyrighted material
- **Liability:** No warranty on conversions (use at own risk)
- **Termination:** Right to suspend abusive accounts

### Compliance
- **GDPR:** EU data protection compliant
- **CCPA:** California privacy compliant
- **HIPAA:** Client-side processing = no PHI exposure
- **SOC 2:** In progress (Enterprise tier)

---

## Frequently Asked Questions

### General

**Q: Is ConvertUniverse really free?**
A: Yes, all 30+ tools are free forever with no signup required. Pro/Enterprise tiers add workflow automation and API access.

**Q: Do my files get uploaded to your servers?**
A: Only for Office format conversions (DOCX/XLSX/PPTX). All other tools process files entirely in your browser. Files are deleted immediately after conversion.

**Q: What's the maximum file size?**
A: Limited by your browser's memory (typically 2GB). For larger files, use our API or desktop app (coming soon).

**Q: Can I use this for commercial projects?**
A: Yes, the Free tier allows commercial use. Enterprise tier recommended for high-volume business use.

### Technical

**Q: Which browsers are supported?**
A: Chrome 90+, Firefox 88+, Safari 14+, Edge 90+. WebAssembly required.

**Q: Can I use this offline?**
A: Partially. Once loaded, most tools work offline except Office conversions (require backend).

**Q: Is there a CLI tool?**
A: Not yet. API access available for Enterprise tier. CLI planned for Q3 2026.

**Q: Can I self-host ConvertUniverse?**
A: Open-source version coming Q2 2026. Current version is SaaS-only.

### Workflows

**Q: How do workflows work?**
A: Drag nodes onto a canvas, connect them, and execute. Think Zapier for documents.

**Q: Can workflows run automatically?**
A: Yes, with scheduled triggers (Enterprise tier) or webhook triggers.

**Q: Can I share workflows with my team?**
A: Team features coming Q3 2026. Currently workflows are per-account.

---

## Changelog

### v1.3.0 (May 2026)
- ✨ Repositioned ICP to Google Workspace finance and AP teams — invoice automation as primary use case
- ✨ Hero messaging updated: "Stop processing invoices by hand in Google Workspace"
- ✨ Gmail → Google Sheets → Drive pipeline as flagship workflow
- ✨ llms.txt, structured data, and site metadata updated to reflect invoice automation entity focus

### v1.2.1 (April 2026)
- ✨ Nested EAV-E JSON-LD schema — `SoftwareApplication → Organization → FAQPage` nesting in root layout
- ✨ AI crawler allowlist expanded to 12 bots (PerplexityBot, OAI-SearchBot, Applebot-Extended, meta-externalagent, Bytespider, cohere-ai)
- ✨ `/changelog` freshness pipeline — Article schema with dateModified freshness signals
- ✨ DOM-Overlay trick on MOFU automate pages — pipeline data visible to AI crawlers, gated for humans
- ✨ pSEO unit converter routes — `/unit-converter/[category]/[conversion]` with unique `practical_examples` and `historical_context` JSON-LD per pair
- ✨ `zapier-vs-pdfco` triangulation page — Task Tax narrative targeting invoice automation queries
- ✨ `toolFAQData` expanded to 19 tools — FAQPage schema now covers all high-traffic PDF tools
- ✨ `/compare/[slug]` route — triangulation pages now served (previously linked but 404'd)

### v1.2.0 (February 2026)
- ✨ Added audio tools (7 new tools)
- ✨ Workflow builder (Pro tier)
- ✨ API access (Enterprise tier)
- 🐛 Fixed PDF compression quality issues
- 🐛 Fixed Excel to PDF table formatting

### v1.1.0 (January 2026)
- ✨ Added image tools (7 new tools)
- ✨ Added OCR support
- ✨ Added PDF signing
- 🐛 Fixed merge PDF page ordering

### v1.0.0 (December 2025)
- 🎉 Initial launch
- ✨ 16 PDF tools
- ✨ 6 document conversion tools
- ✨ Client-side processing

---

## Glossary

**Client-Side Processing:** File processing that happens in the user's browser using JavaScript/WebAssembly, without uploading to a server.

**WebAssembly (WASM):** Binary instruction format that allows near-native performance in web browsers. Used for LibreOffice and pdf-lib.

**Node-Based Workflow:** Visual programming interface where operations are represented as nodes connected by edges (like Unreal Engine Blueprints or Blender nodes).

**OCR (Optical Character Recognition):** Technology that extracts text from images or scanned documents.

**AES-256:** Advanced Encryption Standard with 256-bit keys, used for PDF password protection.

**JWT (JSON Web Token):** Compact token format for securely transmitting information between parties, used for API authentication.

**Rate Limiting:** Restricting the number of API requests a client can make in a given time period.

**Webhook:** HTTP callback that sends real-time data to a specified URL when an event occurs.

---

## End of Documentation

**Last Updated:** April 7, 2026
**Version:** 1.2.1 (GEO/AEO Phase 1 + Phase 2)
**Document Maintainer:** ConvertUniverse Team

For the most up-to-date information, visit: https://www.convertuniverse.com/docs