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Developer Tools

Handle everyday developer tasks for identifiers, encodings, requests, code, structured data, spreadsheets, local files, test data, regex, SQLite, and Python in a private browser workspace.

Updated August 12, 2026

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140 of 140 tools shown

Identifiers & Schedules

Generate identifiers, inspect ULIDs, and build or evaluate repeatable schedules.

7 tools

UUID GeneratorGenerate RFC 4122 version 4 UUIDs with cryptographically random browser bytes.Nano ID GeneratorCreate compact URL-safe Nano IDs with adjustable length and quantity.ULID GeneratorGenerate lexicographically sortable ULIDs that combine a timestamp with secure randomness.ULID ParserInspect the timestamp and randomness components encoded inside a valid ULID.Cron Expression GeneratorBuild a standard five-field cron expression from common scheduling choices.Cron Next Run CalculatorParse a five-field cron expression and calculate its next scheduled execution times.GUID GeneratorGenerate uppercase, braced, or compact GUID representations from secure UUID bytes.

Encoding & Text Conversion

Convert browser text and bytes across common developer encodings without uploading input.

33 tools

Gzip Text Encoder & DecoderCompress UTF-8 text to Base64 gzip data or restore compressed input locally.Base32 Encoder & DecoderEncode UTF-8 text as RFC 4648 Base32 or decode padded and unpadded input.Base58 Encoder & DecoderConvert UTF-8 bytes with the Bitcoin Base58 alphabet while preserving leading zero bytes.Base64 Encoder & DecoderEncode Unicode text to Base64 or decode Base64 into validated UTF-8 text.Base100 Emoji Encoder & DecoderMap byte values to a reversible emoji alphabet for playful transport, not encryption.Base64 & Hex ConverterConvert the same bytes between Base64 and hexadecimal representations.URL DecoderDecode percent-encoded URL components with clear malformed-sequence errors.URL EncoderPercent-encode a URL component or preserve structural URL delimiters.JSON String Escape & UnescapeEscape plain text for a JSON string value or restore valid JSON string escapes.Unicode Escape ConverterConvert text to JavaScript-style Unicode escapes or decode escapes back to text.Unicode & ASCII Code Point ConverterInspect Unicode code points and rebuild text from decimal or hexadecimal values.JavaScript Escape ConverterApply or reverse legacy JavaScript escape notation for compatibility checks.Punycode Domain ConverterConvert internationalized domain names between Unicode and ASCII-compatible form.ASCII Reference TableSearch printable and control ASCII values in decimal, hexadecimal, and character form.Text & ASCII Number ConverterConvert text characters to numeric code points and restore numeric sequences.Morse Code ConverterEncode Latin text as International Morse code or decode spaced Morse symbols.Chinese Telegraph Code LookupLook up four-digit Chinese telegraph codes or restore supported Han characters.Hex & Text ConverterConvert UTF-8 text to hexadecimal bytes or decode validated hexadecimal input.Fullwidth & Halfwidth ConverterConvert ASCII-width characters and ideographic spaces between fullwidth and halfwidth forms.UTF-8 Byte ConverterInspect UTF-8 bytes as hexadecimal values or decode bytes into Unicode text.Chinese Unicode Escape ConverterConvert Han text and other characters to compact Unicode escapes and back.Roman Numeral ConverterConvert integers from 1 to 3,999 into canonical Roman numerals or validate reverse input.Number to English WordsSpell signed integers and decimal digits in clear English words.English Words to NumberParse conventional English number words into a numeric value.HTML Escape & UnescapeEncode reserved HTML characters as entities or decode standard entities.PHP-Compatible Text CompressorCreate Base64 gzip or deflate data compatible with common PHP compression flows.PHP-Compatible Text DecompressorRestore Base64 gzip or deflate text with clear format selection.Ascii85 Encoder & DecoderEncode UTF-8 bytes as compact Ascii85 text or decode validated standard and Adobe-wrapped input.UTF-16 Byte ConverterConvert text to UTF-16 little-endian or big-endian bytes and decode with explicit BOM handling.UUEncode & UUDecode ToolCreate or restore a complete traditional UUEncoded text block with its mode and filename header.Text Binary & Octal ConverterConvert Unicode text through UTF-8 bytes to fixed-width binary or octal values and back.Spaces, Tabs & Newlines ConverterMake spaces, tabs, line endings, and literal backslashes visible with a reversible escape notation.IP Address Base ConverterConvert one IPv4 address among canonical decimal, binary, octal, hexadecimal, and integer forms.

HTTP & Request Code

Translate cURL commands into readable request code for common programming environments.

4 tools

cURL to Python ConverterTranslate a cURL command into Python Requests code with headers, body, and method.cURL to jQuery AJAX ConverterTranslate a cURL command into an explicit jQuery AJAX request configuration.cURL to JavaScript Fetch ConverterTranslate a cURL command into native JavaScript Fetch API code.cURL to PHP ConverterTranslate a cURL command into PHP cURL setup and response-handling code.

Code Formatting & Conversion

Format, minify, compile, or translate code and structured documents with visible limitations.

23 tools

Strip HTMLRemove HTML elements, active content, and markup while retaining readable browser-decoded text.HTML to Plain TextConvert inert HTML headings, paragraphs, lists, links, and table cells into readable plain text.CSS Formatter & MinifierFormat readable CSS or create a compact minified result for delivery.Java Code FormatterApply conservative indentation to Java source without pretending to compile it.JavaScript Formatter & MinifierFormat JavaScript with Prettier or minify it with Terser in the browser.JavaScript One-Line RecipesBrowse and copy practical single-expression JavaScript recipes with visible inputs.TypeScript to JavaScript CompilerCompile TypeScript syntax to browser-readable JavaScript without executing the result.JavaScript to TypeScript StarterInfer a conservative TypeScript starting point from common JavaScript declarations.JavaScript MinifierMinify JavaScript with Terser while keeping source execution disabled.SQL Formatter & MinifierFormat common SQL dialects or compact whitespace outside quoted values.PHP Formatter & MinifierApply conservative PHP indentation or remove comments and redundant whitespace.XML Formatter & MinifierFormat XML indentation or compact safe inter-tag whitespace.HTML & CSS to ImageRender a sandboxed HTML and CSS preview into a downloadable PNG image.HTML Attribute CleanerRemove selected classes, styles, IDs, data attributes, and event handlers from HTML.HTML Formatter & MinifierFormat HTML with Prettier or compact safe inter-tag whitespace.HTML to JavaScript StringConvert HTML into an escaped JavaScript template or string expression.HTML & JSP Writer ConverterWrap HTML as JSP writer output or restore compatible writer statements.HTML & ASP Writer ConverterWrap HTML as classic ASP Response.Write output or restore compatible lines.HTML & Perl Print ConverterWrap HTML as escaped Perl print statements or restore compatible output.HTML & PHP Echo ConverterWrap HTML as escaped PHP echo statements or restore compatible lines.HTML & SWS Writer ConverterConvert HTML into document.write style SWS output and restore compatible lines.HTML & UBB ConverterConvert a practical subset of HTML formatting into UBB tags and back.HTML & VB.NET Writer ConverterWrap HTML as escaped VB.NET Response.Write statements or restore compatible lines.

JSON, XML & Structured Data

Validate, query, and convert structured data into interoperable formats and typed models.

31 tools

URL ParserParse an HTTP or HTTPS URL into its host, path, query, fragment, and safe normalized form.XML to Plain TextExtract values or leaf paths from well-formed XML without loading external resources.JSON to Plain TextTurn valid JSON into a values-only list, path listing, or indented plain-text outline.SQL to Java Entity GeneratorConvert a simple CREATE TABLE statement into a typed Java entity class.XML & JSON ConverterConvert XML documents to JSON or build XML from JSON with explicit root handling.PHP Array to JSON ConverterConvert common PHP array syntax into validated JSON without executing PHP.PHP Serialize ToolSerialize JSON-compatible values into PHP serialize format in the browser.PHP Unserialize ToolDecode supported PHP serialized values into readable JSON without running objects.HTML Table to JSONParse the first HTML table into JSON objects using its header row.Cookie to JSON ConverterParse a Cookie request-header string into a JSON object.JSON to Cookie ConverterConvert a flat JSON object into a Cookie request-header string.JSON & YAML ConverterConvert validated JSON to YAML or parse YAML into formatted JSON.JSON & CSV ConverterConvert JSON records to CSV or rebuild JSON from a CSV table with visible mapping warnings.JSON & TSV ConverterConvert JSON records to tab-separated values or rebuild JSON from a TSV table.XML & CSV ConverterTurn repeated XML records into CSV or build reviewable XML data from a CSV table.XML & TSV ConverterTurn repeated XML records into TSV or build reviewable XML data from a TSV table.XML & YAML ConverterConvert well-formed XML and YAML while retaining visible element, text, and attribute fields.YAML & CSV ConverterConvert YAML records to CSV or rebuild YAML from a CSV table without guessing value types.YAML & TSV ConverterConvert YAML records to TSV or rebuild YAML from tab-separated fields.JSON to SQL Table GeneratorInfer SQL column types from JSON records and create a reviewable CREATE TABLE statement.JSON to TOML ConverterConvert a JSON object into TOML while reporting unsupported structures.TOML to JSON ConverterParse TOML into formatted JSON with syntax error feedback.JSON ValidatorValidate JSON syntax, display the exact parse error, and optionally repair common mistakes.JSON to TypeScript TypesInfer reusable TypeScript interfaces from representative JSON data.JSON to PHP ArrayConvert JSON values into readable modern PHP array syntax.JSON & Query String ConverterConvert flat or repeated query parameters to JSON and back.JSON to Go StructInfer Go struct fields and JSON tags from representative JSON objects.JSON to Java ClassInfer Java fields and nested value types from representative JSON.JSON to C# ClassInfer PascalCase C# properties and JSON property annotations from JSON.JSON Formatter & MinifierValidate JSON and switch between readable indentation and compact output.JSONPath TesterEvaluate a JSONPath expression against JSON and inspect matched values.

CSV, Excel & Tables

Inspect and transform tabular files locally with explicit workbook and file-size limits.

19 tools

Tabular Text to HTML TableConvert pasted TSV or CSV rows into an escaped semantic HTML table.Excel File ViewerInspect worksheet names and cell values from local XLSX files.Excel File MergerMerge worksheets from multiple local XLSX files into one downloadable workbook.Excel Worksheet SplitterSplit every worksheet in a workbook into its own downloadable XLSX file.Excel Link ExtractorExtract explicit hyperlinks and URL-like cell values from a local workbook.Excel Find & ReplaceReplace matching text across workbook cells and download a new XLSX copy.Excel Column ExtractorSelect worksheet columns and export their values as CSV.CSV & Excel ConverterConvert CSV text to XLSX or export the first worksheet of XLSX as CSV.Excel to JSON ConverterConvert local XLSX worksheets into structured JSON arrays.CSV & TSV ConverterConvert quoted CSV and TSV tables while preserving embedded delimiters and line breaks.Delimited Data & Aligned Columns ConverterConvert delimited rows to readable aligned columns or turn aligned text back into delimited data.CSV & TSV Transpose ToolFlip a delimited table so every source row becomes a column and every column becomes a row.Rows & Columns ConverterReshape delimited records between wide columns and a reviewable long key-and-value layout.Extract & Delete Columns ToolKeep or remove selected table columns by heading or numbered position without changing the source.Add & Insert Columns ToolAdd a named column at the beginning, end, or beside a selected table column.Replace & Transform Column ToolReplace text, trim spaces, or change letter case inside one selected table column.Swap & Reorder Columns ToolSwap two columns or define the complete column order with visible positional checks.Delimiter ConverterConvert CSV, TSV, pipe, semicolon, or one-character custom-delimited tables with correct quoting.JSON to Excel ConverterWrite arrays of JSON objects into a downloadable XLSX workbook.

Files, References & Diagnostics

Inspect file signatures, MIME types, byte-order marks, directory trees, and large text files.

10 tools

Base64 & File ConverterEncode a local file as Base64 or download decoded bytes with an explicit MIME type.Image to Base64 ConverterCreate a browser Data URL from a validated local image without uploading the file.Base64 to Image ConverterPreview and download an image represented by a Base64 string or Data URL.Text File Encoding ConverterInspect a text file and download a normalized UTF-8 copy with optional BOM removal.Magic Bytes ReferenceSearch common file signatures by extension, format name, or hexadecimal prefix.MIME Type ReferenceSearch common MIME types by media type, extension, or description.Chrome Internal Pages ReferenceBrowse common chrome:// diagnostic and configuration pages with safety notes.Directory Tree GeneratorTurn relative file paths into a readable directory tree with stable sorting.Large File Line CounterCount newline-delimited records in a local text file using browser streams when available.BOM Detector & RemoverDetect UTF byte-order marks in local files and download a copy without the marker.

Developer Generators & Testers

Create safe test data, convert names and addresses, and test regular expressions in the browser.

11 tools

vCard Contact GeneratorCreate a standards-oriented VCF contact file from names, phones, and email addresses.Date Range GeneratorGenerate inclusive ISO dates between two calendar dates with a safe row limit.Random IP Address GeneratorCreate random public-style IPv4 test addresses while excluding reserved ranges.International Phone Test Data GeneratorCreate format-valid fictional phone-number samples for selected countries.IPv4 to IPv6 ConverterConvert IPv4 addresses into mapped, compatible, full, and compressed IPv6 notation.Random MAC Address GeneratorGenerate locally administered unicast MAC addresses for safe test fixtures.Random Number GeneratorGenerate unique or repeated integer samples with cryptographic browser randomness.Regular Expression TesterTest JavaScript regular expressions, flags, captures, and replacement text with limits.Camel, Snake & Kebab Case ConverterConvert identifiers among camelCase, PascalCase, snake_case, kebab-case, and words.Random Structured Data GeneratorGenerate bounded XML, YAML, or TSV test records from a small visible field schema.Random Fixture GeneratorGenerate fractions, bytes, base-N values, dates, shuffled letters, or safe pattern-derived text.

Browser Runtimes

Run isolated SQLite queries and Python snippets through browser WebAssembly runtimes.

2 tools

SQLite BrowserOpen a local SQLite database and run read-only queries through WebAssembly.Python Browser RunnerRun bounded Python snippets through Pyodide WebAssembly without a server-side interpreter.

LOCAL, REVIEWABLE WORKFLOWS

A practical browser toolbox for everyday development work

Find one focused developer task and get a result you can inspect: create identifiers and schedules, convert text and bytes, turn cURL into request code, format source, validate JSON or XML, work with spreadsheets, inspect local files, generate sample data, test regular expressions, query SQLite, or run a small Python snippet. Search and group navigation help you start from a known format or runtime.

Inputs are not placed in the URL or saved as account history. Results stay visible with their limits, and file-changing tools create a new download instead of overwriting the selected source. The browser is a convenient scratch space for bounded work; keep important projects in your normal editor, backups, and usual code workflow.

Browser-first processing reduces unnecessary exposure

Ordinary text, source code, workbook cells, database bytes, and generated values stay inside the current tab. You can inspect the input and result before copying or downloading, without sending routine developer data through a NexaCurrent conversion service.

Local does not mean unlimited. A compressed workbook or database can consume far more memory after parsing, and expensive regular expressions can pause a tab. File count, file size, text length, result count, and query type therefore have explicit limits. For larger data, a desktop tool or your normal project workflow remains the safer choice.

Know what a conversion can tell you

A cURL converter writes equivalent request code but never sends it. A formatter improves layout but does not prove that the program compiles. JSON model generators infer only obvious types and need your review. HTML previews remove active content before rendering, but a preview is not a security audit. Treat each result as a useful transformation or inspection aid, not as proof that a program, request, file, or dependency is safe.

SQLite accepts read-only SELECT, WITH, and PRAGMA work, while Python runs through a browser WebAssembly runtime only after the visitor requests it. Both are intended for small, controlled experiments. They do not offer operating-system access, long-running jobs, multi-user isolation, migration safety, or unrestricted native packages.

Outputs remain inspectable and reversible where possible

Encoding tools distinguish Unicode characters, UTF-8 bytes, and text representations such as Base32, Base58, Base64, hexadecimal, Morse code, or Punycode. Reversible pages expose both directions and reject malformed alphabets or invalid byte boundaries. Generators use the browser cryptography interface rather than a predictable pseudo-random seed when uniqueness or test variation matters.

File-changing operations always create a new download instead of overwriting the selected source. Important workbook features such as macros, formulas, drawings, encryption, and vendor-specific metadata may not round-trip, so the original must be retained. The visible result, filename, summary, and limitations provide a checkpoint before anything is copied into a project.

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