50 free tools · 100% client-side
Developer tools that respect your data
Diff, decode, format and generate. Nothing you paste ever leaves your browser. Built by the Softinbit engineering team for the work we do every day — and free for yours.
Text 6
A|B
Text CompareDiff two texts with word-level highlights, change navigation and one-click merging.
∩
List CompareFind what's only in A, only in B, in both, or in either list.
Aa
Text Analyzer & Case ConverterLive word and character counts, top words, case conversion and line tools.
\n
Escape / UnescapeTurn text into a valid string literal, or a literal back into text, for 11 formats.
MD
Markdown PreviewLive GitHub-flavored Markdown editor with synced scrolling and HTML export.
U+
Unicode & Invisible Character InspectorSee the characters you can't see, and clean them up in one click.
Formatters 6
{ }
JSON Formatter & ValidatorPretty-print, minify and validate JSON with pinpoint errors, auto-fix and a tree view.
SQL
SQL FormatterBeautify or minify SQL for T-SQL, PostgreSQL, MySQL, SQLite and more.
XML
XML Formatter & XPath TesterPretty-print or minify XML, find well-formedness errors and test XPath.
</>
HTML Beautifier & MinifierPretty-print or minify HTML, with embedded CSS and JS, precise errors and size stats.
{;}
CSS Beautifier & MinifierFormat or minify CSS, SCSS and LESS with precise errors and size stats.
JS
JavaScript & TypeScript BeautifierFormat JS, TS, JSX and TSX with Prettier, and minify JavaScript with Terser.
Converters 5
Y⇄J
JSON to YAML ConverterTwo-way JSON ⇄ YAML conversion with auto-detection and precise error locations.
CSV
JSON to CSV ConverterJSON arrays to CSV and back, with a live table preview and Excel-friendly output.
0x
Number Base ConverterBinary, octal, decimal, hex and base 2-36 with two's complement and a bit editor.
⏱
Unix Timestamp ConverterEpoch seconds, milliseconds, ISO 8601, RFC 2822 and .NET ticks, converted both ways.
CRON
Cron Expression ParserCron in plain English, next run times and a field-by-field breakdown.
Encoders & Decoders 7
B64
Base64 Encode / DecodeUTF-8 safe Base64 for text and files, with URL-safe output and forgiving decoding.
IMG
Image to Base64Image to data URI and back: drop, paste, preview, copy as CSS or HTML.
%20
URL Encode / DecodePercent-encode, decode and take apart URLs, with a decoded query-parameter table.
<
HTML Entity Encode / DecodeEscape text for HTML and decode any named or numeric entity.
JWT
JWT Decoder & VerifierDecode, explain and verify JWTs. Expiry at a glance, signatures checked locally.
GZ
Gzip Compress / DecompressGzip, zlib and raw deflate for text and files, with sizes and compression ratio.
X.509
X.509 Certificate DecoderRead PEM, DER and .p7b certificates and chains: SANs, expiry, fingerprints, signatures.
Generators 7
ID
UUID / GUID / ULID GeneratorBulk UUID v4, v7 and ULID generation plus an inspector that decodes versions and timestamps.
#
Hash Generator & ChecksumMD5, SHA-1, SHA-2 and CRC-32 for text or files, HMAC mode and checksum verification.
***
Password GeneratorStrong passwords and passphrases with exact entropy, generated locally.
Lor
Lorem Ipsum GeneratorPlaceholder text by paragraphs, sentences or words, as text, HTML or Markdown.
QR
QR Code GeneratorQR codes for links, Wi-Fi, contacts and more, with PNG and SVG download.
KEY
RSA & ECDSA Key Pair GeneratorKey pairs in every format .NET needs: PEM, JWK with kid, XML, OpenSSH. Generated locally.
MOCK
Mock Data GeneratorBuild a schema, get up to 10,000 rows as JSON, CSV, SQL INSERT or C#, reproducible with a seed.
Testers 5
(.*)
Regex TesterLive JavaScript regex matching with groups, replace preview and a backtracking guard.
$.
JSONPath TesterRun JSONPath queries live and see every match with its normalized path.
XSD
XML Schema (XSD) ValidatorCheck an XML document against an XSD with real libxml2, right in the browser.
{✓}
JSON Schema Validator & GeneratorValidate JSON against draft 2020-12 or draft-07 schemas, or generate a schema from samples.
TR
TCKN, VKN & IBAN Validator / Test Data GeneratorCheck TCKN, VKN and IBAN numbers, see why they fail, and generate valid test values with C# code.
.NET & Code 6
C#
JSON to C# ClassesPaste JSON, get clean C# records or classes ready for System.Text.Json.
ENV
appsettings.json ⇄ Environment VariablesFlatten appsettings.json into env vars for Docker, Kubernetes and Azure, or rebuild it from them.
DB
Connection String Builder & ParserPaste any connection string: see every field, catch risky settings, rebuild it cleanly.
cURL
curl to C# HttpClientPaste a curl command, get clean .NET 8 HttpClient code, plain or as a typed client.
TS
JSON to TypeScriptPaste JSON, get TypeScript interfaces and a matching Zod schema.
1.2.3
SemVer & NuGet Version Range TesterTest NuGet and npm version ranges, sort by SemVer precedence, bump versions.
Diagnostics 3
at
.NET Stack Trace CleanerTurn a wall of exception text into the root cause and the line in your code that started it.
LOG
Serilog / CLEF Log ViewerFilter, search and read structured .NET logs without a log server.
PLAN
SQL Server Execution Plan ViewerSee the operator tree and the problems in a SQL Server plan, ranked by how much they matter.
Web & Network 2
Graphics 3
CB
Color Blindness SimulatorCheck a UI, chart or photo for colour-blind users, side by side.
⇄
Image ConverterBatch convert to PNG, JPEG, WebP or AVIF with resize and quality control.
#A5
Color Converter & Contrast CheckerEvery color format, .NET included, plus WCAG contrast with fix suggestions and an OKLCH palette.
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Private by designEverything runs in your browser. No uploads, no logging of what you paste.
No sign-up, no adsOpen the page and use it. Works offline once loaded.
Keyboard friendlyCtrl+Enter runs, / searches, focus mode for big inputs.
Remembers your inputInputs are kept in your browser's local storage so a refresh never loses work.