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<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
<link rel="icon" href="icon.svg" type="image/svg+xml">
<link rel="manifest" href="manifest.json">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Encode files, convert text and inspect JWTs in your browser. No account or upload service. Includes an offline download.">
<meta name="application-version" content="0.4.2">
<meta name="referrer" content="no-referrer">
<meta name="theme-color" content="#0d1117">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'sha256-y3+0DfT3QOmamqTJ/TQe/wVVkFvwTDVXwsz46pEp7OQ='; worker-src 'self' blob:; style-src 'unsafe-inline'; img-src 'self' data: blob:; media-src blob:; connect-src 'self' https:; object-src 'none'; base-uri 'none';">
<meta property="og:title" content="Base64 Converter Pro">
<meta property="og:description" content="Encode files, convert text and inspect JWTs locally. Try the browser toolkit or download it for offline use.">
<meta property="og:type" content="website">
<meta property="og:url" content="https://sysadmindoc.github.io/Base64Converter/">
<title>Base64 Converter Pro</title>
<!-- Libraries -->
<script src="vendor/fflate-0.8.3.js"></script>
<script src="vendor/qrcode-generator-1.4.4.js"></script>
<style>
*, *::before, *::after {
box-sizing: border-box;
margin: 0;
padding: 0;
}
:root {
--bg-primary: #0d1117;
--bg-secondary: #161b22;
--bg-tertiary: #21262d;
--bg-hover: #30363d;
--border-color: #30363d;
--text-primary: #e6edf3;
--text-secondary: #8b949e;
--text-muted: #6e7681;
--accent: #58a6ff;
--accent-hover: #79b8ff;
--success: #3fb950;
--warning: #d29922;
--error: #f85149;
--purple: #a371f7;
--orange: #f0883e;
--output-font-size: 13px;
--output-font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Consolas', monospace;
--radius-sm: 4px;
--radius-md: 8px;
--radius-lg: 12px;
--transition-fast: 0.15s ease;
--transition-normal: 0.2s ease;
--shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
--shadow-md: 0 4px 12px rgba(0,0,0,0.3);
--shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
--focus-ring: 0 0 0 3px rgba(88, 166, 255, 0.25);
--drop-zone-hover: rgba(88, 166, 255, 0.05);
}
[data-theme="light"] {
--bg-primary: #ffffff;
--bg-secondary: #f6f8fa;
--bg-tertiary: #eaeef2;
--bg-hover: #d0d7de;
--border-color: #d0d7de;
--text-primary: #1f2328;
--text-secondary: #656d76;
--text-muted: #8c959f;
--accent: #0969da;
--accent-hover: #0550ae;
--success: #1a7f37;
--warning: #9a6700;
--error: #cf222e;
--purple: #8250df;
--orange: #bc4c00;
--shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
--shadow-md: 0 4px 12px rgba(0,0,0,0.1);
--shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
--focus-ring: 0 0 0 3px rgba(9, 105, 218, 0.2);
--drop-zone-hover: rgba(9, 105, 218, 0.04);
}
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
background: var(--bg-primary);
color: var(--text-primary);
min-height: 100vh;
line-height: 1.5;
transition: background var(--transition-normal), color var(--transition-normal);
}
.app-container {
max-width: 1200px;
margin: 0 auto;
padding: 1.5rem 1rem 3rem;
}
/* Header */
header {
display: flex;
align-items: center;
justify-content: space-between;
margin-bottom: 1.5rem;
flex-wrap: wrap;
gap: 1rem;
}
.logo {
display: flex;
align-items: center;
gap: 0.75rem;
}
.logo-icon {
width: 40px;
height: 40px;
border-radius: 10px;
display: block;
}
h1 {
font-size: 1.5rem;
font-weight: 600;
}
.header-actions {
display: flex;
gap: 0.5rem;
align-items: center;
}
/* Buttons */
.btn {
display: inline-flex;
align-items: center;
justify-content: center;
gap: 0.5rem;
padding: 0.5rem 1rem;
font-size: 0.875rem;
font-weight: 500;
border: 1px solid var(--border-color);
border-radius: 6px;
cursor: pointer;
transition: all var(--transition-fast);
background: var(--bg-tertiary);
color: var(--text-primary);
white-space: nowrap;
}
.btn:hover:not(:disabled) {
background: var(--bg-hover);
border-color: var(--text-muted);
}
.btn:focus-visible {
outline: 2px solid var(--accent);
outline-offset: 2px;
}
.btn:disabled {
opacity: 0.5;
cursor: not-allowed;
}
.btn:active:not(:disabled) {
transform: scale(0.97);
}
.btn-primary {
background: var(--accent);
border-color: var(--accent);
color: white;
font-weight: 600;
}
.btn-primary:hover:not(:disabled) {
background: var(--accent-hover);
border-color: var(--accent-hover);
}
.btn-sm {
padding: 0.375rem 0.75rem;
font-size: 0.8rem;
}
.btn-icon {
padding: 0.5rem;
width: 36px;
height: 36px;
}
.btn-group {
display: flex;
gap: 0;
}
.btn-group .btn {
border-radius: 0;
}
.btn-group .btn:first-child {
border-radius: 6px 0 0 6px;
}
.btn-group .btn:last-child {
border-radius: 0 6px 6px 0;
}
.btn-group .btn:not(:last-child) {
border-right: none;
}
.btn-group .btn.active {
background: var(--accent);
border-color: var(--accent);
color: white;
}
/* Tabs */
.tabs {
display: flex;
gap: 0.25rem;
background: var(--bg-secondary);
padding: 0.3rem;
border-radius: var(--radius-md);
margin-bottom: 1.5rem;
border: 1px solid var(--border-color);
}
.tab {
flex: 1;
padding: 0.5rem 1rem;
font-size: 0.8rem;
font-weight: 500;
border: none;
border-radius: 6px;
cursor: pointer;
transition: all var(--transition-fast);
background: transparent;
color: var(--text-secondary);
letter-spacing: 0.01em;
}
.tab:hover {
color: var(--text-primary);
background: var(--bg-tertiary);
}
.tab.active {
background: var(--bg-primary);
color: var(--text-primary);
box-shadow: var(--shadow-sm);
font-weight: 600;
}
/* Main Grid */
.main-grid {
display: grid;
grid-template-columns: 1fr 320px;
gap: 1.5rem;
}
@media (max-width: 1000px) {
.main-grid {
grid-template-columns: 1fr;
}
}
/* Cards */
.card {
background: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
overflow: hidden;
box-shadow: var(--shadow-sm);
}
.card-header {
display: flex;
align-items: center;
justify-content: space-between;
padding: 0.875rem 1rem;
background: transparent;
border-bottom: 1px solid var(--border-color);
gap: 0.5rem;
flex-wrap: wrap;
}
.card-title {
font-size: 0.875rem;
font-weight: 600;
}
.card-body {
padding: 1rem 1.125rem;
}
/* Drop Zone */
.drop-zone {
border: 2px dashed var(--border-color);
border-radius: var(--radius-md);
padding: 2.5rem 1.5rem;
text-align: center;
cursor: pointer;
transition: all var(--transition-normal);
background: var(--bg-primary);
position: relative;
}
.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.drag-over {
border-color: var(--accent);
background: var(--drop-zone-hover);
}
.drop-zone.drag-over {
box-shadow: var(--focus-ring);
}
.drop-icon {
width: 40px;
height: 40px;
margin: 0 auto 0.75rem;
color: var(--text-muted);
opacity: 0.5;
}
.drop-text {
font-size: 0.95rem;
margin-bottom: 0.25rem;
}
.drop-hint {
color: var(--text-secondary);
font-size: 0.8rem;
}
/* URL Input */
.url-input-group {
display: flex;
gap: 0.5rem;
margin-top: 1rem;
padding-top: 1rem;
border-top: 1px solid var(--border-color);
}
.url-input {
flex: 1;
padding: 0.5rem 0.75rem;
font-size: 0.85rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
color: var(--text-primary);
}
.url-input:focus {
outline: none;
border-color: var(--accent);
box-shadow: var(--focus-ring);
}
/* File List */
.file-list {
margin-top: 1rem;
display: flex;
flex-direction: column;
gap: 0.5rem;
max-height: 250px;
overflow-y: auto;
}
.file-item {
display: flex;
align-items: center;
gap: 0.75rem;
padding: 0.75rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
}
.file-item.processing { border-color: var(--accent); }
.file-item.complete { border-color: var(--success); }
.file-item.error { border-color: var(--error); }
.file-icon {
width: 36px;
height: 36px;
background: var(--bg-tertiary);
border-radius: 6px;
display: flex;
align-items: center;
justify-content: center;
flex-shrink: 0;
overflow: hidden;
}
.file-icon img {
width: 100%;
height: 100%;
object-fit: cover;
}
.file-details {
flex: 1;
min-width: 0;
}
.file-name {
font-size: 0.85rem;
font-weight: 500;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.file-meta {
font-size: 0.75rem;
color: var(--text-secondary);
display: flex;
gap: 0.75rem;
flex-wrap: wrap;
}
.file-actions {
display: flex;
gap: 0.25rem;
}
.progress-bar {
width: 100%;
height: 3px;
background: var(--bg-tertiary);
border-radius: 2px;
overflow: hidden;
margin-top: 0.5rem;
}
.progress-fill {
height: 100%;
background: linear-gradient(90deg, var(--accent), var(--purple));
transition: width 0.2s ease;
}
/* Output Section */
.output-section {
margin-top: 1rem;
}
.output-textarea {
width: 100%;
min-height: 150px;
max-height: 300px;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
padding: 0.875rem;
color: var(--text-primary);
font-family: var(--output-font-family);
font-size: var(--output-font-size);
line-height: 1.5;
resize: vertical;
word-break: break-all;
}
.output-textarea:focus {
outline: none;
border-color: var(--accent);
box-shadow: var(--focus-ring);
}
.output-actions {
display: flex;
gap: 0.5rem;
margin-top: 0.75rem;
flex-wrap: wrap;
}
/* Hash Display */
.hash-display {
margin-top: 1rem;
padding: 0.75rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
font-family: var(--output-font-family);
font-size: 0.75rem;
}
.hash-item {
display: flex;
gap: 0.5rem;
margin-bottom: 0.375rem;
}
.hash-item:last-child {
margin-bottom: 0;
}
.hash-label {
color: var(--text-secondary);
min-width: 60px;
}
.hash-value {
word-break: break-all;
cursor: pointer;
min-height: 24px;
display: inline-block;
}
.hash-value:hover {
color: var(--accent);
}
/* Code Snippet */
.code-snippet-section {
margin-top: 1rem;
}
.code-tabs {
display: flex;
gap: 0.25rem;
margin-bottom: 0.5rem;
flex-wrap: wrap;
}
.code-tab {
padding: 0.3rem 0.625rem;
min-height: 24px;
font-size: 0.7rem;
font-weight: 500;
border: 1px solid transparent;
border-radius: var(--radius-sm);
cursor: pointer;
background: transparent;
color: var(--text-muted);
transition: all var(--transition-fast);
}
.code-tab:hover {
color: var(--text-primary);
background: var(--bg-tertiary);
}
.code-tab.active {
background: var(--accent);
border-color: var(--accent);
color: white;
font-weight: 600;
}
.code-output {
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
padding: 0.75rem;
font-family: var(--output-font-family);
font-size: var(--output-font-size);
overflow-x: auto;
white-space: pre-wrap;
word-break: break-all;
max-height: 150px;
overflow-y: auto;
}
/* Text Panel */
.text-input {
width: 100%;
min-height: 200px;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
padding: 0.875rem;
color: var(--text-primary);
font-family: var(--output-font-family);
font-size: var(--output-font-size);
line-height: 1.5;
resize: vertical;
}
.text-input:focus {
outline: none;
border-color: var(--accent);
box-shadow: var(--focus-ring);
}
/* Settings */
.settings-group {
margin-bottom: 1rem;
}
.settings-group:last-child {
margin-bottom: 0;
}
.settings-label {
display: block;
font-size: 0.75rem;
font-weight: 600;
color: var(--text-secondary);
text-transform: none;
letter-spacing: 0.01em;
margin-bottom: 0.5rem;
}
.settings-select {
width: 100%;
padding: 0.5rem 0.75rem;
font-size: 0.85rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
color: var(--text-primary);
cursor: pointer;
}
.settings-select:focus {
outline: none;
border-color: var(--accent);
box-shadow: var(--focus-ring);
}
.settings-input {
width: 100%;
padding: 0.5rem 0.75rem;
font-size: 0.85rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
color: var(--text-primary);
}
.settings-input:focus {
outline: none;
border-color: var(--accent);
box-shadow: var(--focus-ring);
}
.checkbox-group {
display: flex;
flex-direction: column;
gap: 0.5rem;
}
.checkbox-item {
display: flex;
align-items: center;
gap: 0.5rem;
}
.checkbox-item input[type="checkbox"] {
width: 16px;
height: 16px;
accent-color: var(--accent);
cursor: pointer;
}
.checkbox-item label {
font-size: 0.85rem;
cursor: pointer;
}
/* Stats */
.stats-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 0.5rem;
}
.stat-item {
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
padding: 0.625rem;
text-align: center;
}
.stat-value {
font-size: 1.1rem;
font-weight: 600;
color: var(--accent);
font-variant-numeric: tabular-nums;
}
.stat-label {
font-size: 0.65rem;
color: var(--text-muted);
letter-spacing: 0.01em;
}
/* History */
.history-list {
display: flex;
flex-direction: column;
gap: 0.5rem;
max-height: 300px;
overflow-y: auto;
}
.history-item {
display: flex;
align-items: center;
gap: 0.75rem;
padding: 0.5rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
cursor: pointer;
transition: all var(--transition-fast);
}
.history-item:hover {
border-color: var(--text-muted);
box-shadow: var(--shadow-sm);
}
.history-icon {
width: 28px;
height: 28px;
background: var(--bg-tertiary);
border-radius: 4px;
display: flex;
align-items: center;
justify-content: center;
font-size: 0.65rem;
color: var(--text-secondary);
}
.history-details {
flex: 1;
min-width: 0;
}
.history-name {
font-size: 0.75rem;
font-weight: 500;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.history-meta {
font-size: 0.65rem;
color: var(--text-secondary);
}
.history-empty {
text-align: center;
padding: 1.5rem 1rem;
color: var(--text-secondary);
font-size: 0.85rem;
}
/* Modals */
.modal-overlay {
position: fixed;
inset: 0;
background: rgba(0, 0, 0, 0.5);
backdrop-filter: blur(4px);
display: flex;
align-items: center;
justify-content: center;
z-index: 1000;
opacity: 0;
visibility: hidden;
transition: all var(--transition-normal);
padding: 1rem;
}
.modal-overlay.visible {
opacity: 1;
visibility: visible;
}
.modal {
background: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
max-width: 500px;
width: 100%;
max-height: 85vh;
overflow-y: auto;
transform: scale(0.97) translateY(8px);
transition: transform var(--transition-normal), opacity var(--transition-normal);
box-shadow: var(--shadow-lg);
opacity: 0;
}
.modal-overlay.visible .modal {
transform: scale(1) translateY(0);
opacity: 1;
}
.modal-header {
display: flex;
align-items: center;
justify-content: space-between;
padding: 1rem 1.25rem;
border-bottom: 1px solid var(--border-color);
position: sticky;
top: 0;
background: var(--bg-secondary);
}
.modal-title {
font-size: 1rem;
font-weight: 600;
}
.modal-body {
padding: 1.25rem;
}
.qr-container {
background: white;
padding: 1rem;
border-radius: 8px;
display: inline-block;
margin-bottom: 1rem;
}
.qr-container canvas {
display: block;
}
.qr-warning {
font-size: 0.8rem;
color: var(--warning);
margin-top: 0.75rem;
}
/* Diff Tool */
.diff-container {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 1rem;
}
.diff-input {
width: 100%;
min-height: 150px;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
padding: 0.75rem;
color: var(--text-primary);
font-family: var(--output-font-family);
font-size: 0.8rem;
resize: vertical;
}
.diff-input:focus {
outline: none;
border-color: var(--accent);
box-shadow: var(--focus-ring);
}
.diff-result {
margin-top: 1rem;
padding: 1rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 6px;
}
.diff-match { color: var(--success); }
.diff-mismatch { color: var(--error); }
/* Image Resize */
.resize-controls {
display: flex;
gap: 0.5rem;
align-items: center;
flex-wrap: wrap;
}
.resize-input {
width: 80px;
padding: 0.375rem 0.5rem;
font-size: 0.8rem;
background: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 4px;
color: var(--text-primary);
text-align: center;
}
.resize-input:focus {
outline: none;
border-color: var(--accent);
box-shadow: var(--focus-ring);
}
/* Toast */
.toast-container {
position: fixed;
bottom: 1.5rem;
right: 1.5rem;
display: flex;
flex-direction: column;
gap: 0.5rem;
z-index: 1001;
}
.toast {
background: var(--bg-tertiary);
border: 1px solid var(--border-color);
box-shadow: var(--shadow-md);
padding: 0.75rem 1rem;
border-radius: 8px;
font-size: 0.85rem;
display: flex;
align-items: center;
gap: 0.5rem;
transform: translateX(120%);
transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
max-width: 320px;
}
.toast.visible { transform: translateX(0); }
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--error); }
.toast.warning { border-left: 3px solid var(--warning); }
/* Preview */
.preview-container {
margin-top: 1rem;
text-align: center;
}
.preview-media {
max-width: 100%;
max-height: 200px;
border-radius: 6px;
background: var(--bg-primary);
}
/* Scrollbar */
::-webkit-scrollbar {
width: 8px;
height: 8px;
}
::-webkit-scrollbar-track {
background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
background: var(--border-color);
border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
background: var(--text-muted);
}
/* Skip link */
.skip-link {
position: absolute;
top: -100%;
left: 1rem;
padding: 0.5rem 1rem;
background: var(--accent);
color: white;
border-radius: var(--radius-sm);
z-index: 1002;
font-size: 0.85rem;
text-decoration: none;
transition: top var(--transition-fast);
}
.skip-link:focus {
top: 0.5rem;
}
/* Utility */
.visually-hidden {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}
.badge {
display: inline-flex;
align-items: center;
padding: 0.15rem 0.5rem;
font-size: 0.65rem;
font-weight: 600;
border-radius: 10px;
background: var(--bg-tertiary);
color: var(--text-secondary);
letter-spacing: 0.02em;