Developer Tools
Time zones, JSON, and regex utilities built for speed, privacy and clarity.
Jump into the tools you need as a developer: align meetings across time zones, format or validate JSON responses, and test regex patterns with safe guards and quick highlights.
Time Zone Converter
Compare multiple cities
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JSON Viewer
Format, tree view, copy
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Regex Tester
Flags, highlight, replace
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Text Cleaner
Clean, dedupe, sort, and format line lists
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Hash Generator
MD5/SHA-1/SHA-256/HMAC
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UUID/ULID Generator
UUID v4 + ULID
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Timestamp Converter
Unix ↔ ISO, UTC/local
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CRC Calculator
Text/hex/file Base64/Data URI
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JWT Tool
Decode, verify, sign JWTs
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Favicon Downloader
Extract website icons
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Time Zone Converter
Compare cities and working hours
Istanbul vs New York vs Tokyo
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JSON Viewer
Format, minify, tree view
Paste API response, copy formatted
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Regex Tester
Flags, replace, highlight
Find emails or URLs safely
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Text Cleaner
Clean, dedupe, sort, transform
Prepare SQL IN lists from IDs
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Hash Generator
MD5/SHA-1/SHA-256/HMAC
Copy hex or Base64 instantly
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UUID/ULID Generator
UUID v4 + ULID
Generate a list for tests & seeds
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Timestamp Converter
Unix ↔ ISO, UTC/local
Seconds vs ms without guessing
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CRC Calculator
CRC-32/16/8 presets + custom model
Text/hex/file/Base64/Data URI
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JWT Tool
Decode, verify, sign
Debug exp/nbf/iat, kid & JWKS
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Favicon Downloader
Extract and download site icons
Find ICO/PNG/SVG + Apple touch
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Developer Tools FAQ
How many time zones can I compare?
Add up to five target cities plus a source zone; working-hour overlays help schedule calls.
Is JSON parsing private?
Yes. JSON is parsed locally in your browser and never sent to servers.
How are regex hangs prevented?
Regex runs in a Web Worker with length limits and a 150 ms timeout to reduce ReDoS risk.
Can I sort JSON keys?
Enable key sorting before formatting to produce deterministic output for code reviews.
Can I copy and download outputs?
Every tool includes copy buttons, and JSON viewer can download .json files.