BriarKit
keyboard-first - no signup - browser-only

A fast developer workbench
for the tools you reach for every day.

BriarKit is a modern browser-based workbench for JSON, regex, encoding, hashes, timezones, text transformations, color workflows, network utilities, code formatting, and more. The goal is not just more tools. It is faster execution, stronger defaults, better shortcuts, and shareable states.

Your tool input is 100% private, and stays in your browser only. Verify it by opening DevTools and checking the Network tab.

start with the tools that already exist, then expand by category

Tool Categories

10 groups

JSON & Data

The highest-frequency cluster: inspect, transform, validate, diff, and generate schemas or types.

JSON FormatterJSON to YAMLJSON DiffJSONPathJSON Schema ValidatorJSON to TypeScript

Regex

Live testing, explanation, visual construction, and reusable pattern libraries.

Regex TesterRegex ExplainerRegex BuilderPattern LibraryCheatsheet

Encoding / Decoding

Daily conversion tools for URLs, Base64, JWT payloads, Unicode, percent-encoding, and more.

Base64URL Encode/DecodeJWT DecodeHTML EntitiesHex to ASCIIUnicode Lookup

Hashing & Crypto

Utility-grade crypto helpers for hashes, HMACs, IDs, and randomness.

Hash GeneratorHMAC GeneratorHMAC VerifyUUID GeneratorPassword Generator

Time & Timezones

High-value scheduling and timestamp tools with fast conversion and explanation.

Unix TimestampTimezone ConverterCron BuilderISO 8601 BuilderDate Difference

Text Tools

Manipulate raw text quickly without leaving the browser or opening a heavy editor.

Case ConverterSort & DedupeFind & ReplaceMarkdown PreviewLorem Ipsum

Color Tools

Developer-oriented color workflows for accessibility, palettes, and CSS-ready formats.

Contrast CheckerHEX/RGB/HSLPalette GeneratorGradient BuilderTailwind Color Reference

Image Tools

Privacy-first image utilities stay in the mix as one category, not the product identity.

Compress ImageImage ResizeConvert FormatSVG OptimizerFavicon Generator

Network & HTTP

Reference and utility tools around URLs, headers, MIME types, IPs, and request metadata.

HTTP Status CodesMIME LookupURL ParserCIDR CalculatorUser Agent Parser

Code Tools

Formatters, diffs, and snippet utilities for common engineering workflows.

SQL FormatterCode FormatterDiff ViewerEscape StringsSnippet Generator

Available Now

57 live tools

The live tools now cover seven active categories, from JSON work and regex flows to encoding, crypto, time conversion, text cleanup, and color workflows in the same browser-only workbench.

JSON tools

6 tools
J F
JSON FormatterFormat, validate, minify, and inspect JSON with instant feedback
Open tool
J Y
JSON to YAMLConvert JSON into YAML with readable structure and browser-only processing
Open tool
J T
JSON to TypeScriptGenerate TypeScript interfaces from JSON with browser-only processing
Open tool
J D
JSON DiffCompare two JSON documents, inspect changed paths, and export a readable diff
Open tool
J P
JSONPath QueryRun JSONPath queries against JSON and inspect matched values or paths
Open tool
J S
JSON Schema ValidatorValidate JSON against a JSON Schema and inspect validation errors
Open tool

Regex tools

5 tools
R T
Regex TesterTest regular expressions live, inspect matches, and jump straight to matched text
Open tool
R E
Regex ExplainerBreak down a regular expression into readable pieces and understand what each token does
Open tool
R B
Regex BuilderBuild common regex patterns from structured inputs and test them against sample text
Open tool
R L
Pattern LibraryBrowse reusable regex patterns, inspect examples, and copy practical snippets quickly
Open tool
R C
CheatsheetLook up regex anchors, classes, quantifiers, groups, and flags in one fast reference
Open tool

Encoding tools

6 tools
E B
Base64 ConverterEncode plain text into Base64 or decode Base64 back into UTF-8 text
Open tool
E U
URL Encode/DecodeEncode or decode URL text, query components, and full URLs
Open tool
E J
JWT DecodeDecode JWT header and payload locally, inspect claims, and keep the token
Open tool
E H
HTML EntitiesEncode or decode HTML entities locally and inspect safe text transformations instantly
Open tool
E X
Hex to ASCIIConvert plain text into hex or decode hex back into readable UTF-8 text
Open tool
E L
Unicode LookupInspect characters, code points, escapes, and byte representations from input text
Open tool

Hashing & crypto

10 tools
H G
Hash GeneratorHash input text instantly with browser-native algorithms and export the digest in hex or Base64
Open tool
H M
HMAC GeneratorGenerate keyed HMAC signatures locally with common digest algorithms and export the result instantly
Open tool
H V
HMAC VerifyVerify an expected HMAC signature against local input, secret, algorithm, and output format
Open tool
H U
UUID GeneratorGenerate UUID v4 or v7 locally, in single or batch output, with no server round trip
Open tool
H P
Password GeneratorGenerate strong passwords locally with configurable length, sets, and batch output
Open tool
C A
AES Encrypt / DecryptEncrypt or decrypt text locally with AES-GCM and a passphrase-derived key
Open tool
C R
RSA Key Pair GeneratorGenerate RSA key pairs locally and export public and private PEM blocks
Open tool
C E
RSA Encrypt / DecryptEncrypt short text with a public RSA key or decrypt Base64 ciphertext with the matching private key
Open tool
C P
Keypair / PEM ViewerInspect PEM blocks locally, including type, headers, and decoded body size
Open tool
C G
PGP Inspect / Armor DecodeInspect ASCII-armored PGP blocks locally and decode armor metadata and body size
Open tool

Time & timezones

5 tools
T U
Unix TimestampConvert local date and time into Unix seconds or milliseconds, or paste a timestamp to reverse it
Open tool
T Z
Timezone ConverterCompare one date and time across common engineering time zones without leaving the browser
Open tool
T C
Cron BuilderBuild a five-field cron expression quickly and export the result with a readable explanation
Open tool
T I
ISO 8601 BuilderConstruct ISO 8601 strings with UTC, local offset, or date-only output in one fast browser tool
Open tool
T D
Date DifferenceCalculate the exact time span between two local datetimes and export the result instantly
Open tool

Text tools

5 tools
X C
Case ConverterConvert text into lower, upper, camel, Pascal, snake, kebab, title, sentence, and more
Open tool
X S
Sort & DedupeSort lines, remove duplicates, trim whitespace, and clean text lists instantly
Open tool
X F
Find & ReplaceFind text or regex matches and replace them instantly with live output and match counts
Open tool
X M
Markdown PreviewPreview markdown live with a rendered output pane and browser-only processing
Open tool
X L
Lorem IpsumGenerate placeholder paragraphs, sentences, or lines instantly with browser-only controls
Open tool

Color tools

5 tools
C C
Contrast CheckerCheck WCAG contrast ratios for foreground and background colors with live preview
Open tool
C H
HEX / RGB / HSLConvert HEX, RGB, and HSL values instantly with a live color preview and CSS-ready output
Open tool
C P
Palette GeneratorGenerate tints, shades, and harmony palettes from one base color with CSS-ready output
Open tool
C G
Gradient BuilderBuild linear or radial gradients with editable stops, live preview, and CSS-ready output
Open tool
C T
Tailwind Color ReferenceBrowse Tailwind CSS color families with both v3 legacy hex values and the current v4 palette
Open tool

Image tools

5 tools
I C
Image CompressorCompress images locally, choose JPEG or WebP output, target a file size, and download the result
Open tool
I R
Image ResizeResize images locally with exact dimensions, aspect lock, presets, and browser-only export
Open tool
I F
Convert FormatConvert images locally between JPEG, PNG, and WebP with instant preview and browser-only export
Open tool
I S
SVG OptimizerOptimize SVG markup locally by removing comments, metadata, and editor-only attributes before export
Open tool
I G
Favicon GeneratorGenerate common favicon and app icon PNG sizes locally from one source image with browser-only export
Open tool

Network & HTTP

5 tools
N H
HTTP Status CodesLook up HTTP status codes quickly with categories, explanations, and common API usage guidance
Open tool
N M
MIME LookupLook up MIME types, file extensions, and common usage notes for uploads, downloads, and HTTP responses
Open tool
N U
URL ParserParse a URL into protocol, host, credentials, pathname, query params, and fragment details
Open tool
N C
CIDR CalculatorCalculate subnet masks, network ranges, broadcast addresses, and usable hosts from an IPv4 CIDR block
Open tool
N A
User Agent ParserParse a user agent string into browser, engine, operating system, device, and bot details
Open tool

Code tools

5 tools
S Q
SQL FormatterFormat SQL queries locally with readable indentation, keyword casing, and quick export actions
Open tool
C F
Code FormatterFormat JavaScript, TypeScript, JSON, HTML, CSS, Markdown, and YAML locally with parser-aware output
Open tool
D V
Diff ViewerCompare two text or code inputs locally with line-level differences, side-by-side review, and diff export
Open tool
E S
Escape StringsEscape or unescape developer string literals locally for JavaScript, JSON, and regex-safe text
Open tool
S G
Snippet GeneratorGenerate practical developer snippets locally from reusable templates and editable fields
Open tool

Keyboard-first

Command palette, shortcut hints, and fast movement between tools.

Privacy-aware

Sensitive processing should stay local whenever practical and truthful.

Shareable state

Tool configuration should be linkable so handoff is instant.

Global Shortcuts

CtrlKOpen tool palette
CtrlOOpen file in supported tools
Ctrl↵Run current tool
CtrlDDownload result
↑↓Navigate palette
EscReset / close
Esc
All Tools
JSON FormatterFormat, validate, minify, and inspect JSON with instant feedback
J F
JSON to YAMLConvert JSON into YAML with readable structure and browser-only processing
J Y
JSON to TypeScriptGenerate TypeScript interfaces from JSON with browser-only processing
J T
JSON DiffCompare two JSON documents, inspect changed paths, and export a readable diff
J D
JSONPath QueryRun JSONPath queries against JSON and inspect matched values or paths
J P
JSON Schema ValidatorValidate JSON against a JSON Schema and inspect validation errors
J S
Base64 ConverterEncode plain text into Base64 or decode Base64 back into UTF-8 text
E B
URL Encode/DecodeEncode or decode URL text, query components, and full URLs
E U
JWT DecodeDecode JWT header and payload locally, inspect claims, and keep the token
E J
HTML EntitiesEncode or decode HTML entities locally and inspect safe text transformations instantly
E H
Hex to ASCIIConvert plain text into hex or decode hex back into readable UTF-8 text
E X
Unicode LookupInspect characters, code points, escapes, and byte representations from input text
E L
Hash GeneratorHash input text instantly with browser-native algorithms and export the digest in hex or Base64
H G
HMAC GeneratorGenerate keyed HMAC signatures locally with common digest algorithms and export the result instantly
H M
HMAC VerifyVerify an expected HMAC signature against local input, secret, algorithm, and output format
H V
UUID GeneratorGenerate UUID v4 or v7 locally, in single or batch output, with no server round trip
H U
Password GeneratorGenerate strong passwords locally with configurable length, sets, and batch output
H P
AES Encrypt / DecryptEncrypt or decrypt text locally with AES-GCM and a passphrase-derived key
C A
RSA Key Pair GeneratorGenerate RSA key pairs locally and export public and private PEM blocks
C R
RSA Encrypt / DecryptEncrypt short text with a public RSA key or decrypt Base64 ciphertext with the matching private key
C E
Keypair / PEM ViewerInspect PEM blocks locally, including type, headers, and decoded body size
C P
PGP Inspect / Armor DecodeInspect ASCII-armored PGP blocks locally and decode armor metadata and body size
C G
Unix TimestampConvert local date and time into Unix seconds or milliseconds, or paste a timestamp to reverse it
T U
Timezone ConverterCompare one date and time across common engineering time zones without leaving the browser
T Z
Cron BuilderBuild a five-field cron expression quickly and export the result with a readable explanation
T C
ISO 8601 BuilderConstruct ISO 8601 strings with UTC, local offset, or date-only output in one fast browser tool
T I
Date DifferenceCalculate the exact time span between two local datetimes and export the result instantly
T D
Case ConverterConvert text into lower, upper, camel, Pascal, snake, kebab, title, sentence, and more
X C
Sort & DedupeSort lines, remove duplicates, trim whitespace, and clean text lists instantly
X S
Find & ReplaceFind text or regex matches and replace them instantly with live output and match counts
X F
Markdown PreviewPreview markdown live with a rendered output pane and browser-only processing
X M
Lorem IpsumGenerate placeholder paragraphs, sentences, or lines instantly with browser-only controls
X L
Contrast CheckerCheck WCAG contrast ratios for foreground and background colors with live preview
C C
HEX / RGB / HSLConvert HEX, RGB, and HSL values instantly with a live color preview and CSS-ready output
C H
Palette GeneratorGenerate tints, shades, and harmony palettes from one base color with CSS-ready output
C P
Gradient BuilderBuild linear or radial gradients with editable stops, live preview, and CSS-ready output
C G
Tailwind Color ReferenceBrowse Tailwind CSS color families with both v3 legacy hex values and the current v4 palette
C T
Image CompressorCompress images locally, choose JPEG or WebP output, target a file size, and download the result
I C
Image ResizeResize images locally with exact dimensions, aspect lock, presets, and browser-only export
I R
Convert FormatConvert images locally between JPEG, PNG, and WebP with instant preview and browser-only export
I F
SVG OptimizerOptimize SVG markup locally by removing comments, metadata, and editor-only attributes before export
I S
Favicon GeneratorGenerate common favicon and app icon PNG sizes locally from one source image with browser-only export
I G
HTTP Status CodesLook up HTTP status codes quickly with categories, explanations, and common API usage guidance
N H
MIME LookupLook up MIME types, file extensions, and common usage notes for uploads, downloads, and HTTP responses
N M
URL ParserParse a URL into protocol, host, credentials, pathname, query params, and fragment details
N U
CIDR CalculatorCalculate subnet masks, network ranges, broadcast addresses, and usable hosts from an IPv4 CIDR block
N C
User Agent ParserParse a user agent string into browser, engine, operating system, device, and bot details
N A
SQL FormatterFormat SQL queries locally with readable indentation, keyword casing, and quick export actions
S Q
Code FormatterFormat JavaScript, TypeScript, JSON, HTML, CSS, Markdown, and YAML locally with parser-aware output
C F
Diff ViewerCompare two text or code inputs locally with line-level differences, side-by-side review, and diff export
D V
Escape StringsEscape or unescape developer string literals locally for JavaScript, JSON, and regex-safe text
E S
Snippet GeneratorGenerate practical developer snippets locally from reusable templates and editable fields
S G
Regex TesterTest regular expressions live, inspect matches, and jump straight to matched text
R T
Regex ExplainerBreak down a regular expression into readable pieces and understand what each token does
R E
Regex BuilderBuild common regex patterns from structured inputs and test them against sample text
R B
Pattern LibraryBrowse reusable regex patterns, inspect examples, and copy practical snippets quickly
R L
CheatsheetLook up regex anchors, classes, quantifiers, groups, and flags in one fast reference
R C
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