DevToolsBox
Free online developer tools in one place—search below or browse by category. Each section shows a preview; open a category for the full list.
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Showing up to 10 matches. Browse categories below for the full catalog.
Conversion Tools
20 tools · showing 8
- JSON to CSV Converter OnlineFree online data tool to export JSON arrays into spreadsheet-ready CSV for reports and ETL.
- CSV to JSON Converter OnlineFree online converter that turns CSV rows into JSON objects for apps, scripts, and data pipelines.
- XML to JSON Converter OnlineFree online structured-data tool to map XML documents into JSON for JavaScript-friendly processing.
- HEX RGB HSL Color Converter OnlineFree online color converter for developers to swap HEX, RGB, and HSL values for CSS and design tokens.
- JSON to XML Converter OnlineFree online converter that serializes JSON objects into XML for legacy services and integrations.
- TSV to CSV Converter OnlineFree online delimiter tool that converts tab-separated tables into comma-separated CSV files.
- CSV Delimiter Converter OnlineFree online CSV tool that swaps commas, semicolons, and tabs for locale-specific spreadsheet exports.
- YAML to JSON Converter OnlineFree online converter that turns YAML configs into JSON for APIs, CLIs, and automation scripts.
Data Tools
9 tools · showing 8
- JSON Formatter OnlineFree online JSON formatter for developers to beautify, validate, and debug JSON payloads instantly.
- JSON Minifier OnlineFree online JSON minifier that strips whitespace to shrink payloads while keeping JSON valid.
- JSON Validator OnlineFree online JSON validator that catches syntax errors before your API or runtime parses the payload.
- JSON Pretty Print OnlineFree online pretty printer that expands compact JSON into indented trees for configs and API dumps.
- XML Formatter OnlineFree online XML beautifier that adds indentation for SOAP payloads, configs, and API responses.
- XML Minifier OnlineFree online XML minifier that removes unnecessary whitespace when you need a smaller XML payload.
- CSV Validator OnlineFree online CSV checker that spots quoting issues and uneven column counts before imports fail.
- YAML Formatter OnlineFree online YAML formatter that normalizes indentation for cleaner infrastructure and app configs.
Date Tools
6 tools
- Unix Timestamp Converter OnlineFree online developer tool to convert Unix epoch timestamps and ISO dates into readable local time.
- Unix Timestamp Generator OnlineFree online generator that outputs the current Unix time in seconds and milliseconds for APIs and logs.
- ISO 8601 to Unix Timestamp Converter OnlineFree online datetime tool that converts ISO 8601 strings into Unix epoch seconds for APIs.
- Unix Timestamp to ISO 8601 Converter OnlineFree online logging helper that prints ISO UTC strings from Unix timestamps in seconds or ms.
- Timezone Converter OnlineFree online IANA timezone calculator that shifts a local datetime between regions for scheduling.
- Date & Time Difference Calculator OnlineFree online calculator that measures elapsed time between two datetimes in days, hours, and minutes.
Developer Tools
23 tools · showing 8
- UUID Generator OnlineFree online UUID v4 generator to create random RFC 4122 identifiers for databases, APIs, and distributed apps.
- Regex Tester OnlineFree online regex tester for developers to match patterns against sample text before shipping code.
- SQL Formatter OnlineFree online SQL formatter that lays out queries with indentation for reviews and documentation.
- SQL Validator OnlineFree online SQL syntax checker that surfaces obvious mistakes before you execute against a database.
- GUID Generator OnlineFree online GUID generator that outputs UUID-compatible strings for .NET, SQL Server, and Windows apps.
- UUID Normalizer OnlineFree online UUID normalizer that removes braces and standardizes casing for consistent comparisons.
- cURL to Fetch Converter OnlineFree online developer tool that translates curl snippets into browser fetch() calls for API prototyping.
- cURL to HTTPie Converter OnlineFree online CLI helper that rewrites curl commands into readable HTTPie syntax for API testing.
Encoding Tools
8 tools
- Base64 Encoder OnlineFree online Base64 encoder that turns plain text into ASCII-safe strings for APIs, headers, and transport.
- Base64 Decoder OnlineFree online Base64 decoder that restores plain text and helps inspect encoded API or token payloads.
- File to Base64 Encoder OnlineFree online encoder that reads small files and outputs Base64 for data URLs, tests, and API mocks.
- Base64URL Encoder OnlineFree online Base64URL encoder for JWT segments and tokens that must stay safe inside URLs.
- Base64URL Decoder OnlineFree online Base64URL decoder that reads JWT headers and payloads without extra padding hassle.
- Image to Base64 Data URL Encoder OnlineFree online image encoder that outputs data URLs for tiny assets in HTML, CSS, or email prototypes.
- Text to ASCII Codes Converter OnlineFree online encoding inspector that lists decimal ASCII codes per character for debugging strings.
- ASCII Codes to Text Converter OnlineFree online translator that decodes space-separated ASCII numbers back into readable text.
Security Tools
12 tools · showing 8
- JWT Decoder OnlineFree online JWT decoder for developers to inspect header and payload claims without verifying signatures.
- JWT Generator OnlineFree online JWT builder for local auth testing—never paste real production secrets into untrusted sites.
- MD5 & SHA Hash Generator OnlineFree online hash generator for MD5, SHA-1, and SHA-256 digests to checksum strings and debug data.
- Secure Password Generator OnlineFree online password generator that creates long, random secrets with symbols for stronger accounts.
- JWT Claims Inspector OnlineFree online helper that surfaces exp, nbf, aud, iss, and related JWT timing claims for auth debugging.
- Luhn Checksum Validator OnlineFree online Luhn validator that checks numeric identifiers for checksum validity—does not verify accounts.
- IBAN Validator OnlineFree online IBAN checker that validates format and mod-97 checksums before payment integrations.
- bcrypt Hash Generator OnlineFree online bcrypt demo that hashes passwords with a cost factor for learning—avoid real secrets here.
Text Tools
7 tools
- Text Diff Checker OnlineFree online diff tool to compare two texts line by line for configs, copy, and changelog reviews.
- Lorem Ipsum Generator OnlineFree online lorem ipsum generator that fills layouts with placeholder paragraphs for UX mockups.
- Word & Character Counter OnlineFree online text tool that counts words, characters, and lines for writing limits and SEO drafts.
- Text Case Converter OnlineFree online case converter for upper, lower, title, camelCase, snake_case, and other naming styles.
- Email Format Validator OnlineFree online email validator that tests common RFC-style syntax for signup forms and API inputs.
- URL Slug Generator OnlineFree online slugify tool that creates hyphenated, URL-safe strings from titles for blogs and products.
- Text Line Sorter OnlineFree online sorter that alphabetizes newline-separated lists for configs, env files, and inventories.
Web Tools
15 tools · showing 8
- URL Encoder OnlineFree online URL encoder that percent-escapes query values and path segments for safe linking.
- URL Decoder OnlineFree online URL decoder that reveals original characters behind percent-encoding for debugging links.
- HTML Formatter OnlineFree online HTML formatter that indents markup for readable templates and easier debugging.
- HTML Minifier OnlineFree online HTML minifier that trims whitespace to reduce page weight—verify layout after minifying.
- CSS Minifier OnlineFree online CSS minifier that removes comments and excess spacing for leaner stylesheets.
- JavaScript Minifier OnlineFree online JavaScript minifier that compacts scripts for smaller bundles during quick experiments.
- MIME Type Lookup OnlineFree online MIME detector that maps filenames and hints to Content-Type values for HTTP responses.
- HTTP Header Parser OnlineFree online developer tool that splits raw HTTP headers into key/value pairs for proxy debugging.