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Tools100% Local
TOTP / HOTP Generator
Generate one-time codes from a Base32 secret. Paste an otpauth:// URI to auto-fill all options. Compatible with Google Authenticator, 1Password, Authy and any RFC 6238 / 4226 client. Nothing stored.
Algorithm
Digits
Period
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Click to copy
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Counter
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Unix time
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QR Code
Generate a QR code from any text or URL. Works great for otpauth:// URIs to import into Authenticator apps.
Type something above to render a QR code
Base64
Encode plain text to Base64 (RFC 4648) or decode back. Handles Unicode (UTF-8).
Decoded text
Output will appear here
URL Encoder / Decoder
Percent-encode or decode. Choose Component (encodes everything) or Full URL (preserves :/?#[] structure).
Decoded output
Output will appear here
JSON Formatter
Validate, pretty-print, or minify JSON. Errors show exact line and column.
Output
Output will appear here
JWT Decoder & Verifier
Inspect header, payload, and claims. Verify HS256 / RS256 / ES256 signatures locally — your secrets and keys never leave the browser.
↗ Standalone JWT pageHeader
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Paste a token above
Payload
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Signature
Not verified
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Hash Generator
SHA-1, SHA-256, and SHA-512 digests. Type text or drop a file.
Drop a file here to hash it
SHA-1160 bit · 40 hex chars
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SHA-256256 bit · 64 hex chars
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SHA-512512 bit · 128 hex chars
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Hex Converter
Convert text to hex bytes or decode hex back to text. Choose display format below.
Text output
Output will appear here
HTML Entities
Encode special characters to HTML entities, or decode them back. Click a reference entry to insert it.
Decoded output
Output will appear here
Common entities — click to copy
Regex Tester
Test regular expressions live. Matches are highlighted; groups shown in the match list.
Pattern
/
/
Highlighted matches
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Text Diff
Line-by-line comparison of two texts. Green = added, red = removed.
Paste text in both fields above
Color Converter
Enter a color in any format — HEX, rgb(), or hsl(). See and copy all formats instantly.
Enter a color above
HEX—
RGB—
HSL—
oklch—
Red
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Green
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Blue
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Hue
—°
UUID Generator
Generate RFC 4122 version 4 UUIDs using cryptographically random bytes.
Click generate above
Validate / inspect a UUID
Paste a UUID to inspect it
Password Generator
Cryptographically random passwords using crypto.getRandomValues. Pick length and character set.
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Click to copy
Random Number Generator
Cryptographically random integers or decimals from crypto.getRandomValues with rejection sampling for true uniformity. Pick a range, count, and format. No Math.random bias.
Mode
Range
Count
Unique
Sort
Format
Click Generate
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Coin Flip
A real 3D coin flip in the browser. Each outcome is one bit drawn from crypto.getRandomValues — the animation is purely cosmetic, the result is provably 50/50.
HEADS
TAILS
Labels
Per flip
Speed
Total
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Heads
0
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Tails
0
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Longest run
0
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Session history (0 · most recent first)
No flips yet — give it a go.
Unix Timestamp
Convert between Unix epoch seconds and human-readable dates. Local and UTC.
Current timestamp
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UTC
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Local
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Relative
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