GUID Generator
Generate unique globally unique identifiers instantly with our free online tool
Popular GUID Types
Standard UUID
Default UUID format
Brace Format
With curly braces
Compact Format
No hyphens or spaces
Uppercase
All caps format
0 characters
0 GUIDs
Standard
GUID Generation Results
5 unique standard GUIDs generated successfully
Your formatted GUID preview will appear here
✅ High-quality unique GUIDs generated with cryptographic randomness
| GUID Type | Description | Use Cases | Examples |
|---|---|---|---|
| UUID v4 | Randomly generated GUID | Database keys, session IDs | 550e8400-e29b-41d4-a716-446655440000 |
| UUID v1 | Timestamp-based GUID | Logging, audit trails | 123e4567-e89b-12d3-a456-426614174000 |
| Custom Format | User-defined pattern | Specific application needs | ABC-DEF-GHI-JKL-MNO |
Benefits of Using Our GUID Generator
Instant Generation: Create unique GUIDs in seconds
Unique Identifiers: Guarantee non-duplicate GUIDs
Customizable: Adjust format, type, and quantity
Development Ready: Generate identifiers for applications
Why Use Our GUID Generator?
- Free Online GUID Generation Tool
- Multiple GUID Types and Formats
- Customizable Quantity and Validation
- Unique GUID Generation
- Instant Generation
- No Registration Required
- Works on All Devices
- Copy and Download Features
- Quality Analysis Metrics
- Template-Based Generation
💡 Pro Tip: UUID v4 is ideal for most applications as it provides cryptographically secure random numbers. For timestamp-based tracking, use UUID v1. Always validate GUID formats when integrating into systems to ensure compatibility.
GUIDs generated successfully!
`;
}
function copyToClipboard() {
if (generatedGuids.length === 0) {
alert('Please generate GUIDs first');
return;
}
const textarea = document.getElementById('outputGuids');
textarea.select();
textarea.setSelectionRange(0, 99999); // For mobile devices
try {
const successful = document.execCommand('copy');
if (successful) {
showNotification('GUIDs copied to clipboard!');
} else {
showError('Failed to copy GUIDs to clipboard.');
}
} catch (err) {
console.error('Failed to copy: ', err);
showError('Failed to copy GUIDs to clipboard.');
}
}
function downloadGuids() {
if (generatedGuids.length === 0) {
alert('Please generate GUIDs first');
return;
}
const prefix = document.getElementById('guidPrefix').value;
const format = document.getElementById('guidFormat').value;
const blob = new Blob([generatedGuids.join('\n')], { type: 'text/plain' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `guids_${prefix || 'generated'}_${format}.txt`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
showNotification('GUIDs downloaded successfully!');
}
function showNotification(message) {
const notification = document.getElementById('notification');
notification.textContent = message;
notification.classList.add('show');
setTimeout(() => {
notification.classList.remove('show');
}, 3000);
}
function showError(message = "Please enter a valid number of GUIDs.") {
const errorElement = document.getElementById('errorMessage');
errorElement.textContent = message;
errorElement.classList.add('show');
}
function hideError() {
document.getElementById('errorMessage').classList.remove('show');
}
function resetForm() {
// Reset form fields
document.getElementById('guidPrefix').value = '';
document.getElementById('guidFormat').value = 'standard';
document.getElementById('guidCount').value = '5';
document.getElementById('guidType').value = 'uuid4';
document.getElementById('includeTimestamp').checked = true;
document.getElementById('validateFormat').checked = true;
document.getElementById('uniqueGuids').checked = true;
document.getElementById('sortGuids').checked = false;
// Reset output
document.getElementById('outputGuids').value = '';
generatedGuids = [];
// Reset counts
updateGuidStats([], 'standard', 'uuid4');
// Reset UI
document.getElementById('resultsContainer').style.display = 'none';
document.getElementById('previewPlaceholder').style.display = 'flex';
document.getElementById('guidPreview').style.display = 'none';
document.getElementById('qualityInfo').style.display = 'none';
document.getElementById('guidStats').style.display = 'none';
// Disable buttons
document.getElementById('copyBtn').disabled = true;
document.getElementById('downloadBtn').disabled = true;
// Hide progress bar
document.getElementById('progressBar').style.display = 'none';
// Hide any errors
hideError();
// Generate new GUIDs
generateGuids();
}