Developer tools
Find a little help for the task at hand.
215 tools
Apache Redirect Generator
Generate an Apache 301 Redirect directive.
Base64 Encoder & Decoder
Encode plain text to Base64 or decode it safely.
Booklet Page Order Calculator
Generate booklet print page order for page counts divisible by four.
Border Radius Generator
Use Border Radius Generator locally in your browser.
Box Shadow Generator
Use Box Shadow Generator locally in your browser.
Calendar Event Link Generator
Generate a Google Calendar event template link.
Canonical Tag Generator
Generate a canonical link tag from a page URL.
Color Contrast Checker
Use Color Contrast Checker locally in your browser for an immediate result.
Color Converter
Convert a HEX color to RGB and HSL formats.
Color Palette Generator
Use Color Palette Generator locally in your browser.
Content Security Policy Generator
Generate a starter Content Security Policy header.
Credit Card Validator
Use Credit Card Validator locally in your browser.
CSS Animation Timing Generator
Generate CSS animation duration and delay declarations.
CSS Aspect Ratio Generator
Generate a CSS aspect-ratio declaration from width and height.
CSS Clamp Generator
Use CSS Clamp Generator locally in your browser.
CSS Column Generator
Generate CSS multi-column layout declarations.
CSS Container Query Generator
Generate a CSS container-query template.
CSS Font Stack Generator
Generate a CSS font-family stack.
CSS Formatter
Use CSS Formatter locally in your browser.
CSS Gradient Generator
Use CSS Gradient Generator locally in your browser.
CSS Grid Generator
Use CSS Grid Generator locally in your browser.
CSS Letter Spacing Generator
Generate a CSS letter-spacing declaration.
CSS Line Height Generator
Generate a CSS line-height declaration.
CSS Media Query Generator
Generate a CSS media query from a width range.
CSS Minifier
Remove safe whitespace and comments from CSS.
CSS Object Fit Generator
Generate a CSS object-fit declaration.
CSS Opacity Generator
Generate a validated CSS opacity declaration.
CSS Outline Generator
Generate a visible CSS outline declaration.
CSS Scroll Snap Generator
Generate CSS scroll-snap declarations.
CSS Sticky Position Generator
Generate CSS for a sticky element with top offset.
CSS Text Shadow Generator
Generate a CSS text-shadow declaration.
CSS Transform Generator
Use CSS Transform Generator locally in your browser.
CSS Unit Converter
Use CSS Unit Converter locally in your browser.
CSS Z-Index Generator
Generate a CSS z-index declaration with positioning.
CSV Column Extractor
Use CSV Column Extractor locally in your browser.
CSV Column Remover
Remove one selected CSV column locally and download the result.
CSV Column Renamer
Rename one CSV column without changing its data.
CSV Delimiter Converter
Use CSV Delimiter Converter locally in your browser.
CSV Duplicate Row Remover
Use CSV Duplicate Row Remover locally in your browser.
CSV Empty Row Remover
Remove completely empty rows from a CSV file in your browser.
CSV File Cleaner
Clean a CSV file locally by trimming surrounding whitespace, removing blank rows and dropping trailing empty columns.
CSV File Duplicate Row Remover
Remove duplicate data rows from an uploaded CSV file.
CSV File Merger
Merge matching CSV files in your browser and download one combined file.
CSV File Sampler
Create a smaller first-row sample from an uploaded CSV file.
CSV File Search
Find rows containing text in a CSV file and download the matches.
CSV File Sorter
Sort an uploaded CSV file by a selected column.
CSV File Splitter
Split a CSV file into smaller downloadable files without uploading it.
CSV File to HTML Table
Export an uploaded CSV as an accessible HTML table file.
CSV File to JSON
Convert an uploaded CSV file with headers to a JSON download.
CSV File to Markdown
Turn an uploaded CSV into a downloadable Markdown table.
CSV File Validator
Check whether every CSV row has a consistent number of columns.
CSV Header Editor
Replace all CSV column headers and download the updated file.
CSV Header Extractor
Use CSV Header Extractor locally in your browser.
CSV Row Filter
Use CSV Row Filter locally in your browser.
CSV Sorter
Use CSV Sorter locally in your browser.
CSV to JSON Converter
Convert simple CSV data into JSON locally.
CSV to Markdown Table
Use CSV to Markdown Table locally in your browser.
CSV Transpose Tool
Use CSV Transpose Tool locally in your browser.
Email Validator
Use Email Validator locally in your browser for an immediate result.
FAQ Schema Generator
Generate FAQPage structured data for one question and answer.
Favicon Tag Generator
Generate an HTML favicon link tag.
Flexbox Generator
Use Flexbox Generator locally in your browser.
Form Label Checker
Check pasted HTML for unlabeled form controls.
Google Maps Link Generator
Generate a Google Maps search link from an address.
Heading Outline Checker
Check pasted HTML for heading hierarchy issues.
Hreflang Tag Generator
Generate an hreflang alternate link tag.
HTML Attribute Extractor
Use HTML Attribute Extractor locally in your browser.
HTML Definition List Generator
Generate an HTML definition list from terms and definitions.
HTML Encoder & Decoder
Encode HTML safely or decode HTML entities locally.
HTML Entity Lookup
Look up a character’s Unicode and HTML numeric entity.
HTML Landmark Checker
Check pasted HTML for basic page landmarks.
HTML Lang Checker
Check pasted HTML for a document language attribute.
HTML Link Generator
Generate an HTML hyperlink from URL and anchor text.
HTML List Generator
Use HTML List Generator locally in your browser.
HTML Table Generator
Use HTML Table Generator locally in your browser.
HTML Title Checker
Check pasted HTML for a document title.
HTTP Status Code Lookup
Use HTTP Status Code Lookup locally in your browser for an immediate result.
IBAN Validator
Use IBAN Validator locally in your browser.
Iframe Title Checker
Check pasted HTML iframes for titles.
Image Alt Text Checker
Check pasted HTML for images without alt attributes.
Image Background Color Changer
Flatten transparent image regions onto a chosen background color.
Image Blur Editor
Apply a light blur to an uploaded image.
Image Border Tool
Add a colored border to an uploaded image.
Image Brightness Editor
Apply a brightness adjustment to an uploaded image.
Image Color Replacement Tool
Replace a selected similar color in a local image.
Image Compressor
Re-encode a local image as a quality-adjustable JPEG.
Image Contact Sheet Generator
Combine up to 30 local images in a downloadable contact sheet.
Image Contrast Editor
Apply a contrast adjustment to an uploaded image.
Image Cropper
Create a centered square crop from an uploaded image.
Image Duotone Tool
Apply two selected colors to a local image.
Image Flip Horizontal
Flip an uploaded image horizontally and download PNG.
Image Flip Vertical
Flip an uploaded image vertically and download PNG.
Image Grayscale Converter
Create a grayscale PNG from an uploaded image.
Image Inspector
Inspect image dimensions, type and file size locally.
Image Invert Colors
Invert colors in an uploaded image.
Image Mosaic Generator
Create a block mosaic effect from a local image.
Image Opacity Editor
Adjust image alpha and download a transparent PNG.
Image Pixelate Tool
Pixelate a local image using Canvas.
Image Resizer
Resize an uploaded image and download a PNG copy.
Image Rotator
Rotate an uploaded image and download a PNG copy.
Image Rounded Corners Tool
Apply transparent rounded corners to a local image.
Image Sepia Filter
Apply a sepia effect to an uploaded image.
Image Thumbnail Generator
Create a proportionally resized local PNG thumbnail.
Image Tint Tool
Apply a selected tint color to a local image.
Image to JPEG Converter
Convert a browser-supported local image to JPEG with selectable quality.
Image to PNG Converter
Convert a browser-supported image to PNG locally.
Image to WebP Converter
Convert a browser-supported local image to WebP with selectable quality.
Image Transparency Threshold Tool
Create a black-and-white threshold image locally.
Image Watermark Tool
Add text watermark to an uploaded image.
IP Address Validator
Use IP Address Validator locally in your browser for an immediate result.
ISBN Validator
Use ISBN Validator locally in your browser.
JavaScript String Escaper
Use JavaScript String Escaper locally in your browser for a fast result.
JSON Array Inspector
Use JSON Array Inspector locally in your browser.
JSON File Array Filter
Filter objects in a JSON array file by a property value.
JSON File Array Sorter
Sort objects in a JSON array file by a selected property.
JSON File Comparator
Compare two local JSON files for equal values.
JSON File Formatter
Format an uploaded JSON file for readable indentation.
JSON File Key Extractor
List the top-level keys used by a JSON file.
JSON File Merger
Merge JSON array files locally into one download.
JSON File Minifier
Minify an uploaded JSON file and download the compact result.
JSON File Splitter
Split a JSON array file into smaller downloadable files.
JSON File Structure Inspector
Inspect whether a JSON file is an array, object, or scalar value.
JSON File to CSV
Convert a JSON array of objects file into a downloadable CSV.
JSON File Validator
Validate an uploaded JSON file without sending it to a server.
JSON Formatter
Format, minify and validate JSON with useful errors.
JSON Key Finder
Find all matching key paths in local JSON.
JSON Key Lister
Use JSON Key Lister locally in your browser.
JSON Key Renamer
Rename a key throughout a local JSON document.
JSON Path Extractor
Use JSON Path Extractor locally in your browser.
JSON to CSV Converter
Convert a JSON array of objects into CSV locally.
JSON to Markdown Table
Use JSON to Markdown Table locally in your browser.
JSON Top-Level Key Extractor
Extract top-level keys from a local JSON file.
JSON Validator
Use JSON Validator locally in your browser.
JWT Decoder
Decode JWT header and payload locally without verifying its signature.
Link Text Checker
Check pasted HTML for unclear link text.
MAC Address Validator
Use MAC Address Validator locally in your browser for an immediate result.
Mailto Link Generator
Generate a mailto HTML link with an encoded subject.
Markdown Checklist Generator
Use Markdown Checklist Generator locally in your browser.
Markdown Image Generator
Use Markdown Image Generator locally in your browser.
Markdown Link Generator
Use Markdown Link Generator locally in your browser.
Markdown Table Generator
Use Markdown Table Generator locally in your browser.
Media Caption Checker
Check pasted HTML video markup for captions tracks.
Meta Refresh Generator
Generate a delayed meta refresh redirect tag.
Meta Tag Generator
Use Meta Tag Generator locally in your browser.
Morse Code Translator
Use Morse Code Translator locally in your browser for a fast result.
Nginx Redirect Generator
Generate an Nginx permanent redirect rule.
Number Base Converter
Number Base Converter
Paper Weight Calculator
Estimate total paper weight from dimensions, gsm and page count.
Password Generator
Generate strong passwords locally with configurable characters.
Password Strength Checker
Assess password strength locally without saving it.
PDF Margin Calculator
Calculate printable page area after selected margins.
PDF Orientation Helper
Choose portrait or landscape from page dimensions.
PDF Page Range Generator
Generate a valid consecutive PDF print page range.
PDF Page Size Calculator
Show standard PDF and print paper dimensions in millimetres and inches.
PDF Print Cost Calculator
Estimate PDF printing cost from pages, copies and cost per page.
Print Resolution Calculator
Calculate maximum print size from pixels and target DPI.
Query String Parser
Convert URL query strings into readable key-value data.
Random Number Generator
Generate secure random integers in a range.
Random String Generator
Use Random String Generator locally in your browser.
Regex Escaper
Use Regex Escaper locally in your browser for a fast result.
Regex Tester
Test JavaScript regular expressions against sample text.
Robots.txt Generator
Use Robots.txt Generator locally in your browser.
SHA-256 Hash Generator
Create a SHA-256 hash locally in your browser.
Sitemap XML Generator
Use Sitemap XML Generator locally in your browser.
SMS Link Generator
Generate an SMS message link.
Solid Background Remover
Remove a selected solid image background color locally and download a transparent PNG.
SQL Formatter
Use SQL Formatter locally in your browser.
Table Accessibility Checker
Check pasted HTML tables for headers and captions.
Telephone Link Generator
Generate an accessible telephone HTML link.
Text to Binary
Convert UTF-8 text to binary bytes or decode binary text.
Text to Hex Converter
Use Text to Hex Converter locally in your browser for a fast result.
TSV Column Extractor
Extract one TSV column by number.
TSV Duplicate Row Remover
Remove identical TSV rows while preserving order.
TSV Filter
Keep TSV rows containing entered text.
TSV Formatter
Normalize local TSV line endings and output.
TSV Header Extractor
Extract TSV header names.
TSV Row Counter
Count TSV data rows and columns.
TSV Sorter
Sort TSV rows locally.
TSV to CSV Converter
Convert a local tab-separated file to CSV.
TSV to JSON Converter
Convert a local tab-separated file to JSON.
TSV Validator
Validate consistent TSV column counts.
Unicode Code Point Converter
Use Unicode Code Point Converter locally in your browser for a fast result.
Unix Timestamp Converter
Convert Unix timestamps to readable local and UTC dates.
URL Encoder & Decoder
Encode URL components or decode escaped text.
URL List to Markdown Links
Use URL List to Markdown Links locally in your browser.
URL Parser
Break a URL into its protocol, host, path and parameters.
URL Redirect Rule Generator
Create a simple old-to-new URL redirect mapping.
UTM Link Builder
Build a campaign URL with source, medium and campaign parameters.
UUID Generator
Generate secure RFC 4122 version 4 UUIDs locally.
UUID Validator
Validate UUID format and identify its version.
VIN Validator
Use VIN Validator locally in your browser.
Web App Manifest Generator
Generate a basic web app manifest JSON file.
WhatsApp Link Generator
Generate a WhatsApp message link.
XML Attribute Lister
List all attributes found in an uploaded XML file.
XML CDATA Extractor
Extract CDATA sections from a well-formed local XML file.
XML Element Counter
Count XML elements and list unique element names.
XML Element Finder
Find XML elements by tag name locally.
XML File Formatter
Format an uploaded XML file with readable indentation.
XML File HTML Preview
Create a safe escaped HTML preview file from XML.
XML File Merger
Merge XML files that use the same root element.
XML File Minifier
Minify an uploaded XML file and download the compact result.
XML File Text Extractor
Extract readable text content from an XML file.
XML File to JSON
Convert a local XML file to a downloadable JSON file.
XML File Validator
Validate an uploaded XML file in your browser.
XML Formatter
Use XML Formatter locally in your browser.
XML Namespace Inspector
List namespace declarations in a local XML file.
XML Root Element Inspector
Identify the root element and its direct XML structure.
XML to JSON Converter
Use XML to JSON Converter locally in your browser.
XML Validator
Use XML Validator locally in your browser.
PDF to JPG Converter
Convert selected PDF pages to JPG images in a ZIP download.
JPG to PDF Converter
Combine JPG or PNG images into a downloadable PDF.
PDF Merger
Combine multiple PDF files into one PDF.
PDF Splitter
Extract selected pages or page ranges from a PDF.
PDF Compressor
Reduce a PDF through repacking or image-based compression.
Excel to PDF Converter
Export worksheet values from an XLSX workbook to a simple PDF.
No tools found. Try a shorter search or another category.
Developer tools for everyday web and data tasks
Developer tools are most useful when they remove friction from a specific task without hiding how the result was produced. This category includes browser-based utilities for formatting data, generating identifiers, checking markup, encoding text, preparing CSS snippets, inspecting files, and building common web links. Use them while debugging, documenting, prototyping, testing a form, or preparing a small piece of code for a project.
Many tools here work entirely in the browser, including JSON formatters, Base64 utilities, regular-expression testers, HTML accessibility checks, CSS generators, image helpers, and data-file workflows. The page for each tool identifies what it accepts and what it returns. Review generated output before deploying it: code snippets may need project-specific security, escaping, validation, performance, and accessibility work that a focused utility cannot infer from one input.
Safe workflow for developer utilities
- Use a small representative sample before processing a production file or large payload.
- Validate generated JSON, XML, URLs, redirects, and server rules in the environment where they will run.
- Do not paste secrets, private keys, access tokens, customer data, or credentials into browser tools.
- Check browser and server documentation before using generated configuration in production.
Tools Factory aims to provide transparent local helpers, not a replacement for a security review, test suite, source control, or professional engineering judgment. A formatter can make code readable, but it does not prove the code is safe. A validator can identify a format problem, but it does not guarantee business correctness. For security-sensitive, regulated, or production-critical work, follow your organization’s review process and authoritative platform documentation.
Are these developer tools private?
Most supported operations run locally in the browser. Read the tool description and avoid entering secrets or restricted data in any web-based utility.
Can I use generated snippets in production?
Use them as a starting point, then test, review, and adapt them to your application, infrastructure, and security requirements.