50+ tools · runs entirely in your browser

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JSON formatting, encoding, security, generators, and converters - no signup required, nothing ever leaves your browser.

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The ten tools developers open the most, one tap away.

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Featured tools

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JSON Formatter

Format, validate, and minify JSON with syntax highlighting and error line numbers.

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B64
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Base64 Encoder

Encode or decode text, files, and images to and from Base64 instantly.

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JWT
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JWT Decoder

Decode and inspect JSON Web Tokens - header, payload, and signature, all client-side.

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#ID
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UUID Generator

Generate v1 and v4 UUIDs in bulk, ready to copy or export as JSON/CSV.

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Live demo
Password Generator
Tap generate →
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RGX
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Regex Tester

Test regular expressions live against sample text with match highlighting.

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#SH
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Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes from text or files in one click.

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#FF
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Color Converter

Convert instantly between HEX, RGB, HSL, and CMYK with a live preview swatch.

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From the blog

Real fixes, not fluff.

Troubleshooting guides and deep-dives on the errors, security gaps, and setup headaches developers actually run into — across JSON, security, encoding, and beyond.

Updated regularly·52 articles·128 total views
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Why developers trust us

Built the way tools should have always worked

No accounts, no data collection - just fast, reliable tools that respect your time and your data.

Privacy-first

Everything runs client-side. Nothing you paste is ever sent to a server.

Instant, no signup

Open a tool and use it - no account, no email, no paywall.

Built for developers

Keyboard shortcuts, syntax highlighting, and sane defaults everywhere.

Updated regularly

New tools ship every week, based on what the community asks for.

Good to know

Frequently asked questions

Are these tools really free?

Yes. Every tool on SyncTonight is free to use, with no account, signup, or credit card required.

Do you store the data I paste into a tool?

No. All processing happens locally in your browser - your data never touches our servers.

Can I use these tools offline?

Most tools run entirely client-side, so once the page loads they keep working without an internet connection.

Do you add new tools?

Yes - new tools are added regularly based on requests from the developer community.

support.sh
$./ask --question "still stuck?"
→ connecting to a human...
→ avg. response time: 3h
status● operational
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