-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathbase85-encoder-decoder.html
More file actions
336 lines (307 loc) · 17.5 KB
/
Copy pathbase85-encoder-decoder.html
File metadata and controls
336 lines (307 loc) · 17.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
<!DOCTYPE html>
<html lang="en">
<head>
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1981515451878575" crossorigin="anonymous"></script>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Online Base85 (Ascii85) Encoder & Decoder - QuickDevBox</title>
<meta name="description" content="Free online Base85 (Ascii85) encoder and decoder. Convert binary data and text into Adobe / RFC 1924 Base85 string representation.">
<link rel="canonical" href="https://quickdevbox.com/base85-encoder-decoder">
<link rel="icon" type="image/svg+xml" href="favicon.svg">
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
<link rel="stylesheet" href="styles.css?v=2.2">
<!-- Complete OpenGraph & Social Preview Tags -->
<meta property="og:title" content="Online Base85 (Ascii85) Encoder & Decoder - QuickDevBox">
<meta property="og:description" content="Free online Base85 (Ascii85) encoder and decoder. Convert binary data and text into Adobe / RFC 1924 Base85 string representation.">
<meta property="og:url" content="https://quickdevbox.com/base85-encoder-decoder">
<meta property="og:type" content="website">
<meta property="og:image" content="https://quickdevbox.com/og-image.png">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Online Base85 (Ascii85) Encoder & Decoder - QuickDevBox">
<meta name="twitter:description" content="Free online Base85 (Ascii85) encoder and decoder. Convert binary data and text into Adobe / RFC 1924 Base85 string representation.">
<meta name="twitter:image" content="https://quickdevbox.com/og-image.png">
<!-- Search Robots Directive -->
<meta name="robots" content="index, follow, max-image-preview:large, max-snippet:-1">
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "WebApplication",
"name": "Base85 / Ascii85 Encoder & Decoder",
"description": "Free online Base85 (Ascii85) encoder and decoder. Convert binary data and text into Adobe / RFC 1924 Base85 string representation.",
"url": "https://quickdevbox.com/base85-encoder-decoder",
"applicationCategory": "SecurityApplication",
"operatingSystem": "All",
"browserRequirements": "Requires JavaScript. Requires HTML5.",
"offers": {
"@type": "Offer",
"price": "0",
"priceCurrency": "USD"
},
"author": {
"@type": "Organization",
"name": "QuickDevBox Tools",
"url": "https://quickdevbox.com"
}
}
</script>
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "FAQPage",
"mainEntity": [
{
"@type": "Question",
"name": "Why does Base85 achieve higher space efficiency than Base64?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Base85 encodes 4 bytes into 5 characters, reducing expansion overhead to 25% compared to Base64's 33%."
}
},
{
"@type": "Question",
"name": "What is the RFC 1924 Base85 alphabet used in IPv6 addresses?",
"acceptedAnswer": {
"@type": "Answer",
"text": "RFC 1924 maps 128-bit IPv6 addresses into exactly 20 Base85 characters for compact configuration storage."
}
}
]
}
</script>
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-E0LZHPD7SL"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-E0LZHPD7SL');
</script>
</head>
<body>
<header>
<div class="nav-container">
<a href="/" class="logo">
<img src="favicon.svg" alt="QuickDevBox Logo">
QuickDevBox<span>.com</span>
</a>
<nav class="nav-links">
<a href="/">Home</a>
<a href="/json-formatter">JSON Tools</a>
<a href="/base64-encoder-decoder">Base64</a>
<a href="/bcrypt-hash-generator">Bcrypt</a>
<a href="/jwt-decoder">JWT</a>
<a href="mailto:support@quickdevbox.com?subject=QuickDevBox%20Feedback" class="nav-support">✉️ Support</a>
</nav>
</div>
</header>
<main>
<section class="hero" style="padding: 0.5rem 0 0.8rem;">
<h1 style="font-size: 1.6rem; margin-bottom: 0.3rem;">Base85 / Ascii85 Encoder & Decoder</h1>
<p style="font-size: 0.88rem;">Free online Base85 (Ascii85) encoder and decoder. Convert binary data and text into Adobe / RFC 1924 Base85 string representation.</p>
</section>
<section class="tool-box">
<div class="privacy-banner">
<span>🛡️ <strong>100% Client-Side Cryptographic Engine:</strong> All computations are performed locally in your browser with zero network retention.</span>
</div>
<!-- AdSense Responsive Slot -->
<div class="ad-slot-header"></div>
<div class="editor-stacked">
<div class="editor-header">
<span>Input Payload Editor</span>
<span id="editor-counter">0 chars | 0 lines</span>
</div>
<div style="background:rgba(255,255,255,0.03); padding:1.25rem; border-radius:var(--radius-md); border:1px solid var(--bg-card-border);">
<label style="display:block; color:var(--text-muted); font-size:0.85rem; font-weight:600; margin-bottom:0.3rem;">Input String / Payload:</label>
<textarea data-ux="input" id="toolInput" rows="5" oninput="updateCounter();" style="width:100%; font-family:monospace; background:#040711; color:#00f2fe; border:1px solid var(--bg-card-border); border-radius:6px; padding:0.8rem;">QuickDevBox Base85 Encoding Payload</textarea>
</div>
<div class="tool-controls" style="margin-top:0.8rem;">
<button class="btn btn-primary" id="execBtn" onclick="processTool();">⚡ Encode (Ctrl+Enter)</button>
<button class="btn btn-primary" id="decodeBtn" onclick="decodeTool();">🔓 Decode (Ctrl+D)</button>
<button class="btn btn-secondary" onclick="document.getElementById('toolInput').value='QuickDevBox Base85 Encoding Payload'; updateCounter(); processTool();" style="font-size:0.8rem; padding:0.4rem 0.8rem; margin-left:0.5rem;">💡 Fill Sample Data</button>
<button class="btn btn-secondary" onclick="document.getElementById('toolInput').value=''; document.getElementById('toolOutput').value=''; updateCounter();" style="color:var(--danger); font-size:0.8rem; padding:0.4rem 0.8rem; margin-left:0.5rem;">🗑️ Clear</button>
</div>
<div style="background:rgba(255,255,255,0.03); padding:1.25rem; border-radius:var(--radius-md); border:1px solid var(--bg-card-border); margin-top:0.8rem;">
<label style="display:block; color:var(--text-muted); font-size:0.85rem; font-weight:600; margin-bottom:0.3rem;">Processed Cryptographic Output:</label>
<textarea id="toolOutput" rows="5" readonly style="width:100%; font-family:monospace; background:#02050e; color:#4facfe; border:1px solid var(--bg-card-border); border-radius:6px; padding:0.8rem;"></textarea>
<button class="btn btn-secondary" onclick="navigator.clipboard.writeText(document.getElementById('toolOutput').value);" style="margin-top:0.5rem; font-size:0.8rem;">📋 Copy Output</button>
</div>
</div>
<!-- SEO Technical Article Section -->
<!-- Related Tools Section -->
<article class="seo-article">
<h2>Base85 & Ascii85 Encoding: RFC 1924, PDF Compression & Git Binary Diffs</h2>
<p>Base85 (Ascii85) encodes 4-byte binary words into 5 ASCII characters (85^5 > 2^32), producing a low overhead of only 25% (compared to Base64's 33.3%). It is widely deployed across Adobe PostScript/PDF streams and Git binary diff patches.</p>
<div class="tech-specs">
<div class="spec-card">
<strong>Payload Overhead</strong>
<span>+25% size expansion (5 ASCII chars per 4 binary bytes)</span>
</div>
<div class="spec-card">
<strong>Core Standards</strong>
<span>RFC 1924 (IPv6 Compact Base85) / Adobe PostScript Ascii85</span>
</div>
<div class="spec-card">
<strong>Special Shorthand</strong>
<span>Character 'z' represents an all-zero 4-byte block in PostScript</span>
</div>
<div class="spec-card">
<strong>Delimiters</strong>
<span>Adobe Ascii85 streams use <~ and ~> boundary tags</span>
</div>
</div>
<h3>Implementation & Code Examples</h3>
<h4>Python 3 (base64.b85encode)</h4>
<pre><code>import base64
binary_data = b"Arbitrary binary file stream"
# RFC 1924 / Git Base85
b85_str = base64.b85encode(binary_data).decode('ascii')
# Adobe Ascii85
a85_str = base64.a85encode(binary_data).decode('ascii')
print("Base85:", b85_str)</code></pre>
<h4>Node.js (Buffer / Base85 Algorithm)</h4>
<pre><code>// 32-bit big-endian integer to 5-char radix 85 transformation
function encodeWord85(uint32) {
let chars = '';
for (let i = 0; i < 5; i++) {
chars = String.fromCharCode((uint32 % 85) + 33) + chars;
uint32 = Math.floor(uint32 / 85);
}
return chars;
}</code></pre>
<h3>Cryptographic Architecture & Production Security Considerations</h3>
<p>Deploying Base85 & Ascii85 Encoding across cloud backends demands strict adherence to industry-standard defense-in-depth security principles:</p>
<ul>
<li><strong>Side-Channel Timing Resistance:</strong> Always evaluate cryptographic hashes, HMAC signatures, and authentication tokens using constant-time comparison algorithms (like <code>crypto.timingSafeEqual</code>) to eliminate microsecond side-channel timing leaks.</li>
<li><strong>Entropy Sourcing & Nonce Generation:</strong> Ensure all cryptographic nonces, initialization vectors, and salts are derived from cryptographically secure pseudo-random number generators (CSPRNG) like <code>window.crypto.getRandomValues</code> or <code>/dev/urandom</code>.</li>
<li><strong>Key Hygiene & Memory Deallocation:</strong> Zero out sensitive key buffers and decrypted payloads in memory immediately following transformation routines to limit memory dump exposure risks.</li>
</ul>
<section class="faq-section">
<h2>Frequently Asked Questions & Troubleshooting</h2>
<div class="faq-item">
<h3>Why does Base85 achieve higher space efficiency than Base64?</h3>
<p>Base64 slices data into 6-bit chunks (64 symbols), expanding 3 bytes into 4 chars (+33.3%). Base85 evaluates 32-bit words across an 85-symbol alphabet, packing 4 bytes into 5 chars (+25%), saving 8.3% bandwidth.</p>
</div>
<div class="faq-item">
<h3>What is the RFC 1924 Base85 alphabet used in IPv6 addresses?</h3>
<p>RFC 1924 defines a compact Base85 representation for 128-bit IPv6 addresses, utilizing digits 0-9, letters A-Z, a-z, and special characters (!#$%&()*+-;<=>?@^_`{|}~).</p>
</div>
</section>
<h3>Official Standards & Technical References</h3>
<ul>
<li><a href="https://datatracker.ietf.org/doc/html/rfc1924" target="_blank" rel="noopener noreferrer">IETF RFC 1924: A Compact Representation of IPv6 Addresses</a></li>
<li><a href="https://www.adobe.com/products/postscript/pdfs/PLRM.pdf" target="_blank" rel="noopener noreferrer">Adobe PostScript Language Reference Manual (Ascii85 Filter)</a></li>
</ul>
</article>
<section class="related-tools" style="margin-top:2.5rem; padding-top:1.5rem; border-top:1px solid var(--bg-card-border);">
<h3 style="font-size:1.1rem; color:var(--text-main); margin-bottom:1rem;">Related Security & Crypto Tools</h3>
<div style="display:flex; gap:0.8rem; flex-wrap:wrap;">
<a href="/hash-generator" class="btn btn-secondary" style="font-size:0.8rem;">Hash Generator (MD5/SHA)</a>
<a href="/hmac-generator" class="btn btn-secondary" style="font-size:0.8rem;">HMAC Generator</a>
<a href="/bcrypt-hash-generator" class="btn btn-secondary" style="font-size:0.8rem;">Bcrypt Hash Generator</a>
<a href="/base64-encoder-decoder" class="btn btn-secondary" style="font-size:0.8rem;">Base64 Encoder</a>
<a href="/jwt-decoder" class="btn btn-secondary" style="font-size:0.8rem;">JWT Decoder</a>
</div>
</section>
</section>
</main>
<footer>
<div class="footer-container" style="max-width: 1200px; margin: 0 auto; padding: 2rem 1.5rem; text-align: center; color: var(--text-muted); font-size: 0.85rem; border-top: 1px solid var(--bg-card-border);">
<p>© 2026 QuickDevBox.com — Free, Open Source & Privacy-First Developer Tools</p>
<p style="margin-top: 0.5rem;">
<a href="/privacy-policy" style="color: var(--text-muted); text-decoration: none; margin: 0 0.5rem;">Privacy Policy</a> |
<a href="/terms" style="color: var(--text-muted); text-decoration: none; margin: 0 0.5rem;">Terms of Service</a> |
<a href="/about" style="color: var(--text-muted); text-decoration: none; margin: 0 0.5rem;">About</a> |
<a href="https://github.com/hbx1982/quickdevbox" target="_blank" rel="noopener noreferrer" style="color: var(--text-muted); text-decoration: none; margin: 0 0.5rem;">GitHub</a> |
<a href="mailto:support@quickdevbox.com?subject=QuickDevBox%20Feedback" style="color: var(--text-muted); text-decoration: none; margin: 0 0.5rem;">Contact Support</a>
</p>
</div>
</footer>
<script>
function updateCounter() {
const val = document.getElementById('toolInput').value;
const cnt = document.getElementById('editor-counter');
if (cnt) {
const lines = val ? val.split('\n').length : 0;
cnt.textContent = val.length + ' chars | ' + lines + ' lines';
}
}
function processTool() {
const input = document.getElementById('toolInput').value;
const output = document.getElementById('toolOutput');
if (input.length > 1024 * 1024) { alert('Payload exceeds 1MB limit.'); return; }
try {
function encodeA85(str) {
let a85 = '<~';
let padding = 0;
while (str.length % 4 !== 0) { str += '\0'; padding++; }
for (let i = 0; i < str.length; i += 4) {
let num = (str.charCodeAt(i) << 24) | (str.charCodeAt(i+1) << 16) | (str.charCodeAt(i+2) << 8) | str.charCodeAt(i+3);
if (num === 0) { a85 += 'z'; }
else {
let chunk = '';
for (let j = 0; j < 5; j++) {
chunk = String.fromCharCode((num % 85) + 33) + chunk;
num = Math.floor(num / 85);
}
a85 += chunk;
}
}
if (padding > 0) { a85 = a85.substring(0, a85.length - padding); }
return a85 + '~>';
}
output.value = encodeA85(input);
} catch(e) { output.value = 'Error: ' + e.message; }
}
function decodeTool() {
const input = document.getElementById('toolInput').value;
const output = document.getElementById('toolOutput');
if (input.length > 1024 * 1024) { alert('Payload exceeds 1MB limit.'); return; }
try {
function decodeA85(str) {
str = str.replace(/<~/g, '').replace(/~>/g, '').replace(/\s/g, '');
let out = '';
let block = [];
for (let i = 0; i < str.length; i++) {
if (str[i] === 'z') {
if (block.length !== 0) throw new Error("Invalid 'z' inside block");
out += '\0\0\0\0';
} else {
block.push(str.charCodeAt(i) - 33);
if (block.length === 5) {
let num = block[0]*52200625 + block[1]*614125 + block[2]*7225 + block[3]*85 + block[4];
out += String.fromCharCode((num >>> 24) & 255, (num >>> 16) & 255, (num >>> 8) & 255, num & 255);
block = [];
}
}
}
if (block.length > 0) {
let padding = 5 - block.length;
for(let i=0; i<padding; i++) block.push(84); // pad with 'u' (117-33 = 84)
let num = block[0]*52200625 + block[1]*614125 + block[2]*7225 + block[3]*85 + block[4];
if (padding === 4) out += String.fromCharCode((num >>> 24) & 255);
else if (padding === 3) out += String.fromCharCode((num >>> 24) & 255, (num >>> 16) & 255);
else if (padding === 2) out += String.fromCharCode((num >>> 24) & 255, (num >>> 16) & 255, (num >>> 8) & 255);
else if (padding === 1) out += String.fromCharCode((num >>> 24) & 255, (num >>> 16) & 255, (num >>> 8) & 255, num & 255);
}
return out;
}
output.value = decodeA85(input);
} catch(e) { output.value = 'Error: ' + e.message; }
}
document.addEventListener('keydown', function(e) {
if (e.ctrlKey || e.metaKey) {
if (e.key === 'e' || e.key === 'E') { e.preventDefault(); processTool(); }
if (e.key === 'd' || e.key === 'D') { e.preventDefault(); decodeTool(); }
if (e.key === 'Enter') { e.preventDefault(); processTool(); }
}
});
window.addEventListener('DOMContentLoaded', function() {
updateCounter();
processTool();
});
</script>
<script src="ux-enhancements.js?v=2.2"></script>
</body>
</html>